CN103101615A

CN103101615A - Single crystal plate piezoelectric plate type vibration turbulence plate device

Info

Publication number: CN103101615A
Application number: CN201110358812XA
Authority: CN
Inventors: 冯强; 张洋; 崔晓春; 李玲
Original assignee: AVIC Shenyang Aerodynamics Research Institute
Current assignee: AVIC Shenyang Aerodynamics Research Institute
Priority date: 2011-11-14
Filing date: 2011-11-14
Publication date: 2013-05-15

Abstract

The invention discloses a single crystal plate piezoelectric plate type vibration turbulence plate device. The single crystal plate piezoelectric plate type vibration turbulence plate device comprises a piezoelectric wafer made of a piezoelectric material and a turbulence plate vibrating beam made of aluminum alloy, wherein a layer of membrane electrode is compounded at one side of the piezoelectric wafer; the other side of the piezoelectric wafer and the turbulence plate vibrating beam glued together with epoxy resin; a layer of smooth polyimide rectifying layer is coated on the turbulence plate vibrating beam positioned on the outer surface of the piezoelectric wafer so that a single crystal plate piezoelectric piece type vibration turbulence plate is formed; and the single crystal plate piezoelectric piece type vibration turbulence plate and a model platform are assembled in a module form, so that a polyimide rectifying layer is flushed with the upper surface of a model platform are flat to be arranged on a weapon cabin through the model platform. The single crystal plate piezoelectric plate type vibration turbulence plate device provided by the invention is simple in structure and easy to comprehensively arrange on a true plane; meanwhile, the noises are simultaneously controlled, the cabin opening resistance is reduced, the control effect of an embedded weapon stalling characteristic is improved, and the problem that the routine fixed type turbulence plate is disabled under the occasion that Ma is greater than 1 is overcome.

Description

A kind of single-chip piezoelectric platy vibrating spoiler device

Technical field

The present invention relates to the fluid technique field, particularly relate to a kind of levels of aerodynamic noise of opening weapon-bay for aircraft and reduce, weapon-bay open the cabin additional resistance reduce, in bury the single-chip piezoelectric platy vibrating spoiler device that the weapon separation attitude is controlled.

Background technology

Aircraft will be thrown in flight course/weapon delivery usually.Weapon-bay comprises a pair of hatch door usually, only opens when throwing in weapon delivery, within all the other flight time, the weapon-bay hatch door is in closed condition, to keep the smooth pneumatic profile of aircraft, improve the aircraft flight performance, as manoevreability, Stealth Fighter, low-resistance performance etc.

In state of flight, after weapon-bay is opened, between the inner low speed flow of weapon-bay and the outside high velocity air of weapon-bay, form the skim fluid, be called free shear layer.Free shear layer is unsettled, and section forms a large amount of whirlpool unity structures within it.The inner whirlpool of shear layer unity structure bumps against with the weapon-bay rear wall after striding across the weapon-bay accent with shear layer, forms high-intensity cavity resonance, thereby at the high-intensity aerodynamics noise of the inner formation of weapon-bay.This high-intensity aerodynamics noise is to aircraft, weapon-bay and firearm construction, and the weapon-bay inner electronic equipment all has destructive effect.Secondly, because weapon-bay is opened the inhibitory action of rear deck body cavity flow and the vortex system structure formation of cavity inside complexity, can stream the generation considerable influence to the aircraft outside, thereby produce the larger additional resistance of opening the cabin, worsen the overall aeroperformance of aircraft.Again, after weapon-bay was opened, flowing in the cabin formed, and makes in the cabin larger contrary pressure gradient to occur along air flow line, and weapon-bay trailing edge pressure is higher than near pressure leading edge.Under this distribution of pressure, in bury weapon and be subject to larger nose-up pitching moment effect, the separation of burying weapon in being unfavorable for.

At present, the exiter of controlling for the weapon-bay noise is fixed type leading edge spoiler (Spoiler).The leading edge spoiler is a kind of flow control apparatus that stretches out weapon-bay, and its surface is higher than the weapon-bay accent.Leading edge arranges that there is its obvious technological deficiency in the flow control method of disturbing flow device:

1, owing to having destroyed the smooth aerodynamic configuration of aircraft, produce additional resistance;

2, spoiler need to stretch out weapon-bay after weapon-bay is opened, and needs complicated drive system, and increases structural weight;

3, work as flight Mach number MɑAfter 1, control effect and sharply descend, even lost efficacy.

Summary of the invention

The technical problem to be solved in the present invention is to provide and a kind of shear layer is applied excitation, reduces aircraft and opens weapon-bay high-intensity-gas noise, reduces the additional resistance of opening the cabin, buries the single-chip piezoelectric platy vibrating spoiler device of weapon stalling characteristic in improving.

The technical scheme that adopts is:

A kind of single-chip piezoelectric platy vibrating spoiler device comprises the piezoelectric chip of piezoelectric making, the spoiler walking beam that aluminum alloy is made.Described piezoelectric chip one side and spoiler walking beam bond together with epoxide-resin glue, the compound thin film electrode of piezoelectric chip opposite side, be positioned on the spoiler walking beam of outside face and be coated with the smooth polyimide rectification layer of one deck, consist of single-chip piezoelectric type vibrating spoiler.Utilize the inverse piezoelectric effect of piezoelectric, under external voltage, piezoelectric chip produces distortion, produces flexural deformation thereby drive the spoiler beams of metal, forms the most advanced and sophisticated displacement of spoiler.Encourage by alternating voltage, realize the periodic transformation of piezoelectric chip deformation direction, thereby at the most advanced and sophisticated periodic vibration that produces certain frequency (several thousand Hz) of spoiler, flow field to be controlled is produced the high frequency pumping effect.Single-chip piezoelectric platy vibrating spoiler is filled mutually with modular form and model platform, be arranged on the weapon-bay cavity by model platform, reduce unlatching weapon-bay aerodynamics noise and the additional resistance of opening the cabin, improve and bury the weapon stalling characteristic in weapon-bay.

Advantage of the present invention is:

1, the present invention is simple in structure, is easy to comprehensively arrange on true aircraft;

2, the present invention can play simultaneously and suppress noise, reduces the resistance that opens the cabin, buries the control effect of weapon stalling characteristic in improving;

3, being arranged vertically scheme in the present invention has overcome conventional fixed type spoiler and has existed MɑThe problem that lost efficacy in 1 situation;

4, the horizontal arrangement scheme in the present invention does not need complicated mechanical drive system, alleviates structural weight with respect to conventional fixed type spoiler.

Description of drawings

Fig. 1 is structural representation of the present invention.

Fig. 2 is that weapon-bay cavity at right angle setting spoiler is controlled schematic diagram.

Fig. 3 is that weapon-bay cavity level of the present invention is installed spoiler control schematic diagram.

The specific embodiment

A kind of single-chip piezoelectric platy vibrating spoiler device comprises the piezoelectric chip 2 of piezoelectric making, the spoiler walking beam 1 that aluminum alloy is made.The described piezoelectric chip 2 one compound thin film electrodes 4 of side, piezoelectric chip 2 opposite sides and spoiler walking beam 1 use epoxide-resin glue bond together, be positioned on the spoiler walking beam 1 of outside face and be coated with the smooth polyimide rectification layer 3 of one deck, consist of single-chip piezoelectric platy vibrating spoiler, single-chip piezoelectric platy vibrating spoiler is assembled with modular form and model platform 5, make polyimide rectification layer 3 concordant with model platform 5 upper surfaces, be arranged on (see figure 3) on weapon-bay 6 by model platform 5.

The mechanism of action of the present invention

Shown in Figure 2, for being arranged vertically scheme, when not opening the piezoelectric driving part function, the mechanism of action of the present invention is identical with the conventional fixed type spoiler mechanism of action, raise weapon-bay accent shear layer 7 by spoiler, at first make it after striding across weapon-bay 6, eliminate or weaken with " knock-on effect " of weapon-bay trailing edge, thereby eliminate or weaken the disturbance strength of sound source, thereby suppressing noise; Also make simultaneously the outer high-energy fluid of weapon-bay less enter weapon-bay, thereby effectively reduce the weapon-bay additional resistance.Secondly, spoiler makes near the distribution of pressure of weapon-bay frontier and rear be tending towards evenly after raising shear layer, thereby reduces the vertical adverse pressure gradient along air flow line, in bury nose-up pitching moment suffered in the weapon separation process and reduce even opposite sign, bury the weapon stalling characteristic in effectively improving.When opening the piezoelectric driving part function, the weapon-bay shear layer is applied the periodical high-frequency excitation, improve on the one hand MɑThe action effect of＜1 o'clock overcomes on the other hand conventional fixed type spoiler and exists Mɑ1 problem that lost efficacy.

Shown in Figure 3, for the horizontal arrangement scheme, the mechanism of effect of the present invention is mainly the high frequency period excitation by piezoelectricity chip spoiler, change the inner vortex system structure of shear layer or shear layer strides across the flow regime of cavity, thus play slacken sound source, effect that the resistance that reduces to open the cabin, mild longitudinal pressure bury the weapon stalling characteristic in distributing, improving.

Claims

1. single-chip piezoelectric platy vibrating spoiler device, comprise the piezoelectric chip (2) that piezoelectric is made, the spoiler walking beam (1) that aluminum alloy is made, it is characterized in that described piezoelectric chip (2) the one compound thin film electrodes of side (4), piezoelectric chip (2) opposite side and spoiler walking beam (1) bond together with epoxide-resin glue, be positioned on the spoiler walking beam (1) of outside face and be coated with the smooth polyimide rectification layer (3) of one deck, consist of single-chip piezoelectric platy vibrating spoiler, single-chip piezoelectric platy vibrating spoiler is assembled with modular form and model platform (5), make polyimide rectification layer (3) concordant with model platform (5) upper surface, be arranged on weapon-bay (6) by model platform (5).