CN105275928A - Vortex-flow eliminating structure - Google Patents

Vortex-flow eliminating structure Download PDF

Info

Publication number
CN105275928A
CN105275928A CN201410335874.2A CN201410335874A CN105275928A CN 105275928 A CN105275928 A CN 105275928A CN 201410335874 A CN201410335874 A CN 201410335874A CN 105275928 A CN105275928 A CN 105275928A
Authority
CN
China
Prior art keywords
cylindrical object
face
eddy current
edge
fluid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201410335874.2A
Other languages
Chinese (zh)
Inventor
黄荣芳
许清闵
陈佳堃
廖洪钧
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN201410335874.2A priority Critical patent/CN105275928A/en
Publication of CN105275928A publication Critical patent/CN105275928A/en
Pending legal-status Critical Current

Links

Abstract

The invention discloses a vortex-flow eliminating structure. The vortex-flow eliminating structure is in the triangular cone shape and used for being installed on the upper portion of the junction of a columnar object and a plate face. The vortex-flow eliminating structure comprises a bottom face, an edge, a first side face and a second side face. The first side face and the second side face stretch downward from the two sides of the edge respectively. The rear end of the edge, the rear end of the first side face and the rear end of the second side face are all connected to the front end face of the columnar object. The edge, the first side face and the second side face all stretch forwards away from the front end face of the columnar object and are combined into a pointed end. In this way, when the columnar object is placed in fluid and the pointed end faces toward the flowing fluid, a U-shaped vortex formed on the periphery of the columnar object can be eliminated effectively.

Description

Eddy current eliminates structure
Technical field
The present invention is that relevant a kind of eddy current eliminates structure, and espespecially a kind of front-end face at Cylindrical object arranges pyrometric cone, to eliminate the structure of horse-hof shape eddy current.
Background technique
When a Cylindrical object a stands on a ground, and time among the fluid being immersed in flowing, can produce horse-hof shape eddy current (horseshoevortex) b near the intersection (junction) on Cylindrical object a and ground, its shape as shown in Figure 7.This horse-hof shape eddy current b may have 1,2 or 3, the speed that its eddy current number flows according to fluid, the viscosity factor of fluid, when meeting to the Cylindrical object a Extreme breadth of fluid and fluid flowing, suppose that Cylindrical object a does not exist this position and thickness in the boundary layer, face of this position and determines.
As shown in Figure 8 and Figure 9, Fig. 8 is the result that the velocity field using laser velocimeter to measure a cylinder and a slice dull and stereotyped intersection centre vertical cross-section obtains to the Crack cause of these horse-hof shape eddy current b; Fig. 9 is the flowing topology schematic diagram drawn according to figure Fig. 8.Wherein, because the existence of Cylindrical object, fluid is slowed down close to during Cylindrical object, pressure increase forms adverse pressure gradient simultaneously, and forms a stagnation point on the surface of Cylindrical object.Fluid below stagnation point is along the surface of Cylindrical object toward current downflow, again towards updrift side adverse current when running into ground, this one fluid that forward flowed along fluid and the original top of ground reverse flow forms one deck interface, because of the friction caused along inverse two direction flowings, 1,2 or 3 vortex is formed at interface place, these vortexs are subject to the drive of forward streaming flow, just walk around cylinder both sides and the horse-hof shape eddy current formed as Fig. 7.
If the speed (U) flowed by fluid, the viscosity factor (ν) of fluid, the Cylindrical object Extreme breadth (D) of meeting to fluid are combined into nondimensional parameter " reynolds' number " (Reynoldsnumber, a Re) Re ≡ UD/ ν.When reynolds number Re is greatly between 100 – 6000, have an opportunity to form the fixing stable horse-hof shape eddy current of eddy current number; And as more than Re>6000, horse-hof shape eddy current still there will be, but eddy current number is unstable, can change in time.
In practical application in industry, such as: bridge and heat exchanger etc., horseshoe type eddy current can cause many negative effects.Wherein, in the application aspect of bridge, because the generation of horseshoe type eddy current, ground shearing stress can be made to increase, cause the riverbed around bridge pier to produce and wash away hole, hole (scour), wash away hole hole by cause flow field hole hole arround produce larger under wash phenomenon, along with the derivation of time, the diameter in hole, hole becomes large, the depth down in hole, hole, finally allow the base portion of bridge pier cannot effective location, make bridge face the risk of fracture.And for heat exchanger, the intersection of cooling tube and radiating fin is also the flow field problem belonging to Cylindrical object and face intersection, its horseshoe type eddy current is the main cause causing the heat transfer property of cooling tube and radiating fin intersection to reduce.Therefore, eliminate the technology of horseshoe type eddy current near Cylindrical object and face intersection, commercial Application has demand.
And in order to eliminate the horseshoe type eddy current of column and face intersection, the past has research once to propose the method improved.As shown in Figure 10, use a suction means c at the upstream end put based on cylinder, and as shown in figure 11, install one control round bar d at the upstream end put based on column, this circle stalk tilts to column and is attached on column.The application of above-mentioned suction means or inclination control round bar, mainly improves the fluid boundary layer condition on the ground of cylinder upstream end, to suppress the formation of horseshoe type eddy current.But the mode of installing suction means c is inapplicable on riverbed gritty, and can energy source consumption; The mode of installing inclination control round bar d then needs accurately control round bar to be positioned at horseshoe type eddy current place, partly could suppress the formation of horseshoe type eddy current, but because the forming position of horseshoe type eddy current is relevant with the speed that fluid flows, so when practical application, because flow velocity constantly changes, be not easy precise positioning.
Summary of the invention
In view of this, in order to provide a kind of structure being different from prior art, and improve above-mentioned shortcoming, inventor amasss experience for many years and constantly researches and develops improvement, then has generation of the present invention.
An object of the present invention is providing a kind of eddy current elimination structure, the structure of pyrometric cone is set by the front-end face at a Cylindrical object, enable solution forms the problem of horseshoe type eddy current at the front-end face of Cylindrical object, and can allow the flowing of smooth fluid, to extend the working life of bridge, or the hot transfer efficiency of the series products of raising heat exchanger.
In order to achieve the above object, the invention provides a kind of eddy current and eliminate structure, link a Cylindrical object, one end of this Cylindrical object connects a plate face, and this Cylindrical object is for being placed among fluid, this Cylindrical object meets the surface of contact of this streaming flow to be defined as the front-end face of this Cylindrical object, it is triangular pyramidal that this eddy current eliminates structure, comprise a bottom surface, one edge and by the both sides at this edge respectively to one first side of downward-extension and one second side, this bottom surface is close to this plate face, the rear end at this edge, the rear end of this first side and the rear end of this second side connect the front-end face of this Cylindrical object respectively, this edge, this first side and this second side extend forward in the mode of the front-end face away from this Cylindrical object respectively, and combine in one most advanced and sophisticated.
In one embodiment of the present of invention, wherein, this Cylindrical object is D towards the maximum radial width of fluid flow direction, the horizontal equivalent at this Cylindrical object front end and this tip is L, the horizontal subtended angle of this first side and this second side is α, and the elevation angle at this edge is β, and the parameter area of this triangular pyramidal is L/D >=0.75, α≤90 °, β≤60 °.
Eddy current of the present invention is eliminated structure and is avoided the front-end face formation horseshoe type eddy current of fluid at Cylindrical object, thus extends the working life of bridge, or the hot transfer efficiency of the series products of raising heat exchanger, and its using scope is quite extensive.
For understanding the present invention further, below for preferably embodiment, coordinate graphic, figure number, the concrete constitution content of the present invention and effect of reaching thereof are described in detail as follows.
Accompanying drawing explanation
Fig. 1 is the three-dimensional appearance schematic diagram that preferred embodiment of the present invention links a Cylindrical object.
Fig. 2 is the plan view of Fig. 1.
Fig. 3 is the side view of Fig. 1.
Fig. 4 and Fig. 5 is the using state figure of preferred embodiment of the present invention.
Fig. 6 is the side view that preferred embodiment of the present invention is installed on heat exchanger.
Fig. 7 is existing fluid when flowing through Cylindrical object and wall intersection, produces the schematic diagram of horse-hof shape eddy current.
Fig. 8 for use laser velocimeter measure commonly use fluid flow through Cylindrical object and wall intersection time, the velocity field schematic diagram of centre vertical cross-section.
The flowing topology schematic diagram of Fig. 9 for drawing according to figure Fig. 8.
Figure 10 is the three-dimensional appearance schematic diagram that the existing upstream end at cylinder installs a suction means.
Figure 11 is the three-dimensional appearance schematic diagram that the existing upstream end at column installs that controls round bar.
1 eddy current eliminates edge, structure 11 bottom surface 12
13 first side 15, sides 14 second are most advanced and sophisticated
The left arc shaped surface of 2 Cylindrical object 21 front-end face 211
212 plate face, right arc shaped surface 22 front ends 9
D Cylindrical object is towards the maximum radial width in flow direction
Front end and the most advanced and sophisticated horizontal equivalent of L Cylindrical object
The horizontal subtended angle of α first side and the second side
The elevation angle a Cylindrical object b horse-hof shape eddy current at β edge
C suction means d controls round bar
Embodiment
Eddy current of the present invention eliminates structure conjoint one Cylindrical object, and one end of Cylindrical object connects a plate face, and Cylindrical object is for being placed among fluid.This eddy current eliminate structure comprise a bottom surface, an edge and by the both sides at edge respectively to the first side of downward-extension and the second side.Wherein, bottom surface is close to plate face, the rear end of the rear end at edge, the rear end of the first side and the second side connects the front-end face of Cylindrical object respectively, and edge, the first side and the second side extend forward in the mode of the front-end face away from Cylindrical object respectively, and combines in one most advanced and sophisticated.
Refer to shown in Fig. 1 ~ 3, it is the preferred embodiment that eddy current of the present invention eliminates structure 1, and wherein, this Cylindrical object 2 is the rounded bridge pier in cross section, and the cross section of this bridge pier also can be other geometrical shapies, and this plate face 9 is riverbed, and bridge pier base portion is connected to the top in riverbed.When the base portion of bridge pier is placed among current, and current are when being flowed from upstream toward downstream direction, bridge pier meets the surface of contact of current to be defined as the front-end face 21 of this Cylindrical object 2, the center of this front-end face 21 defines the front end 22 that is upright wire, and via this front end 22, front-end face 21 is divided into left arc shaped surface 211 and a right arc shaped surface 212.
It is the triangular pyramidal of inner hollow that this eddy current eliminates structure 1, and during enforcement, this triangular pyramidal also can have solid inside.This eddy current eliminate structure 1 comprise an edge 12, bottom surface 11, one and by the both sides at edge 12 respectively to one first side 13 and one second side 14 of downward-extension, wherein, side, bottom surface 11, first 13 and the second side 14 triangle respectively in outline.Bottom surface 11 is positioned in same level with the base portion of bridge pier, and is close to riverbed simultaneously; The rear end of the rear end at edge 12, the rear end of the first side 13 and the second side 14 connects the front-end face 21 of Cylindrical object 2 respectively, side, edge 12, first 13 and the second side 14 extend forward in the mode of the front-end face 21 away from Cylindrical object 2 respectively, and combine in a tip 15.
Based on above-mentioned trigonal pyramidal structure, Cylindrical object 2 is defined as D towards the maximum radial width in flow direction, the front end 22 of Cylindrical object 2 is defined as L with the horizontal equivalent system of most advanced and sophisticated 15, the horizontal subtended angle (expansionangle) of the first side 13 and the second side 14 is defined as α, the elevation angle (tiltangle) at edge 12 is defined as β, and the parameter area of this triangular pyramidal is L/D >=0.75, α≤90 °, β≤60 °.Within the scope of above-mentioned parameter, when the current to flowing are met at this tip 15, effectively can eliminate the horse-hof shape eddy current being formed in Cylindrical object 2 periphery.
According to above Parameter Conditions to design a pyrometric cone, wherein, the horizontal equivalent L of this pyrometric cone is 1.0 times of Cylindrical object 2 diameter D, horizontal subtended angle α and vertical elevation β is all 15 °, reynolds' number is 3000, and uses Flow Visualization to be apparent in central vertical face and the current kenel near Cylindrical object 2 periphery wall.Shown by the experimental result of Fig. 4 and Fig. 5, after installation pyrometric cone, when current are through cylinder 2 and plate face 9 intersection, close to being all flow smoothly when pyrometric cone and Cylindrical object 2, no longer there is horseshoe type eddy current in current.And shown by the result of testing, eliminate structure 1 according to eddy current of the present invention, in the parameter area of setting, and the above person of reynolds number Re >100, pyrometric cone technology all can effectively eliminate horseshoe type eddy current.
During enforcement, eddy current of the present invention eliminates structure 1 also can be as shown in Figure 6, be applied in the radiating structure of heat exchanger 8 and so on, wherein, this Cylindrical object 2 is the cooling tube of rounded or other geometrical shapies in cross section, this plate face 9 is radiating fin, and cooling tube is through after radiating fin, is formed link with radiating fin.When air-flow is by cooling tube and radiating fin, structure 1 can be eliminated to eliminate the horse-hof shape eddy current being formed in cooling tube periphery via eddy current of the present invention equally.
Therefore, the present invention has following advantage:
1, the present invention arranges a pyrometric cone at the front-end face of a Cylindrical object, and each dimensional parameters of pyrometric cone is set in certain scope, therefore, can allow the flowing of smooth fluid, to avoid forming horseshoe type eddy current at the front-end face of Cylindrical object, thus extend the working life of bridge, or the hot transfer efficiency of the series products of raising heat exchanger.
2, major technique of the present invention is to allow the flowing of smooth fluid, to avoid forming horseshoe type eddy current, therefore, as long as connect a plate face in one end of a Cylindrical object at the front-end face of Cylindrical object, and all can use under Cylindrical object is placed among fluid environment, its using scope is quite extensive.
In sum, according to disclosed above content, the present invention really can reach the object of expection, and provide a kind of flowing that can allow smooth fluid, the eddy current formed to avoid horseshoe type eddy current elimination structure, has the value that industry utilizes, propose application for a patent for invention in accordance with the law.

Claims (2)

1. eddy current eliminates a structure, and link a Cylindrical object, one end of this Cylindrical object connects a plate face, and this Cylindrical object is for being placed among fluid, and this Cylindrical object meets the surface of contact of this streaming flow to be defined as the front-end face of this Cylindrical object, it is characterized in that:
It is triangular pyramidal that this eddy current eliminates structure, comprise a bottom surface, an edge and by the both sides at this edge respectively to one first side of downward-extension and one second side, this bottom surface is close to this plate face, the rear end of the rear end at this edge, the rear end of this first side and this second side connects the front-end face of this Cylindrical object respectively, this edge, this first side and this second side extend forward in the mode of the front-end face away from this Cylindrical object respectively, and combine in one most advanced and sophisticated.
2. eddy current as claimed in claim 1 eliminates structure, it is characterized in that, wherein, this Cylindrical object is D towards the maximum radial width of fluid flow direction, and the horizontal equivalent at this Cylindrical object front end and this tip is L, and the horizontal subtended angle of this first side and this second side is α, the elevation angle at this edge is β, the parameter area of this triangular pyramidal is L/D >=0.75, α≤90 °, β≤60 °.
CN201410335874.2A 2014-07-15 2014-07-15 Vortex-flow eliminating structure Pending CN105275928A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410335874.2A CN105275928A (en) 2014-07-15 2014-07-15 Vortex-flow eliminating structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410335874.2A CN105275928A (en) 2014-07-15 2014-07-15 Vortex-flow eliminating structure

Publications (1)

Publication Number Publication Date
CN105275928A true CN105275928A (en) 2016-01-27

Family

ID=55145528

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410335874.2A Pending CN105275928A (en) 2014-07-15 2014-07-15 Vortex-flow eliminating structure

Country Status (1)

Country Link
CN (1) CN105275928A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111018373A (en) * 2019-12-26 2020-04-17 刘志浩 Energy-saving green environment-friendly material coagulant for regenerating ardealite solid waste and preparation method thereof
CN112482424A (en) * 2020-11-10 2021-03-12 中铁大桥勘测设计院集团有限公司 Assembled pier foundation
CN112977713A (en) * 2021-04-07 2021-06-18 浙江海洋大学 Vortex generator for propeller type ship and ship

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2738923Y (en) * 2003-11-28 2005-11-09 沈阳东北大学冶金技术研究所 Vortex buffer for reducing or eliminating molten steel whirl pool
US20060054073A1 (en) * 2004-08-13 2006-03-16 Edmund Muehlner Apparatus and method for reducing vortices in the wake of a marine member
CN200967925Y (en) * 2006-11-22 2007-10-31 李文正 Improved structure of bridge abutment
CN201292996Y (en) * 2008-11-18 2009-08-19 河南省电力勘测设计院 Diversion pier
US20110315248A1 (en) * 2010-06-01 2011-12-29 Simpson Roger L Low drag asymmetric tetrahedral vortex generators

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2738923Y (en) * 2003-11-28 2005-11-09 沈阳东北大学冶金技术研究所 Vortex buffer for reducing or eliminating molten steel whirl pool
US20060054073A1 (en) * 2004-08-13 2006-03-16 Edmund Muehlner Apparatus and method for reducing vortices in the wake of a marine member
CN200967925Y (en) * 2006-11-22 2007-10-31 李文正 Improved structure of bridge abutment
CN201292996Y (en) * 2008-11-18 2009-08-19 河南省电力勘测设计院 Diversion pier
US20110315248A1 (en) * 2010-06-01 2011-12-29 Simpson Roger L Low drag asymmetric tetrahedral vortex generators

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111018373A (en) * 2019-12-26 2020-04-17 刘志浩 Energy-saving green environment-friendly material coagulant for regenerating ardealite solid waste and preparation method thereof
CN111018373B (en) * 2019-12-26 2020-11-03 刘志浩 Energy-saving green environment-friendly material coagulant for regenerating ardealite solid waste and preparation method thereof
CN112482424A (en) * 2020-11-10 2021-03-12 中铁大桥勘测设计院集团有限公司 Assembled pier foundation
CN112482424B (en) * 2020-11-10 2022-02-15 中铁大桥勘测设计院集团有限公司 Assembled pier foundation
CN112977713A (en) * 2021-04-07 2021-06-18 浙江海洋大学 Vortex generator for propeller type ship and ship

Similar Documents

Publication Publication Date Title
CN102140964B (en) Structure for improving cooling efficiency of gas film of discrete hole
CN105275928A (en) Vortex-flow eliminating structure
CN107742011B (en) Design method of impeller blade drag reduction micro-texture
CN104132000B (en) Elbow-shaped water inlet conduit with excellent hydraulic performance and application method thereof
US20150017385A1 (en) Passive drag modification system
KR101048040B1 (en) Dimple-shaped light pipe for collecting deep sea mineral resources
CN104612758A (en) Low-pressure turbine blade with low loss
CN106050736B (en) A kind of centrifugal blower noise reduction leaf blade structure
CN104533538A (en) Heat exchange channel wall with rib structure
CN203906376U (en) Airfoil blade for drag reduction through riblet surface
CN104791199A (en) Blade tail edge accessory and wind turbine generator system blade
CN102720622A (en) Vortex generator for turbine draft tube
CN107941450A (en) A kind of spout angle eddy generator for suppressing the low frequency pulsation of opening jet stream wind-tunnel
TWI550161B (en) Eddy current elimination structure
CN105197179A (en) Vertical bow and front edge drainage combined damping structure used for low speed full formed ship
CN102645118A (en) Method for improving heat exchange reinforcement effect of vortex generator by use of punching jet flow
CN104139846A (en) Wing with pits
CN103861752A (en) Anti-blockage emitter based on Venturi principle
CN104537170B (en) For Meshing Method and device that pumping plant three-dimensional flow field is calculated
CN208982211U (en) A kind of low-specific-speed noise reduction cylinder blade
CN206106426U (en) Vacuum infusion is with leading flow net
CN104598674A (en) Splitter blade inlet diameter determination method based on energy gradient theory
CN108999846B (en) Super-hydrophobic drag reduction rib structure
CN204025164U (en) A kind of elbow inlet passage of hydraulic performance excellence
CN208619464U (en) A kind of drag reduction rib structure

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
WD01 Invention patent application deemed withdrawn after publication
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20160127