本文選題：流動(dòng)控制 + 流動(dòng)分離�。� 參考：《大連理工大學(xué)》2015年碩士論文

【摘要】：流動(dòng)分離是流體力學(xué)中一種復(fù)雜而普遍的流動(dòng)現(xiàn)象。在航空、航天等領(lǐng)域中,流動(dòng)分離現(xiàn)象會導(dǎo)致飛行器在飛行過程中升力降低、阻力增加,甚至?xí)l(fā)失速現(xiàn)象,對飛行器的安全性能、操作性能等都有影響。在眾多流動(dòng)分離控制技術(shù)中,壓電激勵(lì)器由于結(jié)構(gòu)簡單、安裝方便、耗能少等優(yōu)點(diǎn),具有廣闊的應(yīng)用前景。本文針對翼型流動(dòng)分離控制問題,研究了基于壓電激勵(lì)器的翼型流動(dòng)分離控制技術(shù)。(1)從流動(dòng)控制技術(shù)的應(yīng)用現(xiàn)狀入手,研究目前應(yīng)用較多的翼型流動(dòng)分離控制方法,提出基于壓電激勵(lì)器的翼型流動(dòng)分離控制方法,對其關(guān)鍵作動(dòng)器件—壓電激勵(lì)器進(jìn)行設(shè)計(jì)。簡要地介紹了壓電效應(yīng)及壓電陶瓷材料的性能參數(shù),以壓電方程等基本理論為基礎(chǔ),建立了壓電激勵(lì)器的準(zhǔn)靜態(tài)響應(yīng)位移及固有頻率的理論計(jì)算公式,并優(yōu)化了其結(jié)構(gòu)尺寸,同時(shí),對所設(shè)計(jì)的壓電激勵(lì)器進(jìn)行了仿真分析。(2)對壓電激勵(lì)器進(jìn)行相關(guān)地面實(shí)驗(yàn)的研究。壓電激勵(lì)器的靜態(tài)性能與理論計(jì)算及數(shù)值仿真的結(jié)果接近,驗(yàn)證了理論計(jì)算模型的準(zhǔn)確性；對壓電激勵(lì)器進(jìn)行幅頻特性實(shí)驗(yàn),4個(gè)壓電激勵(lì)器的諧響應(yīng)性能基本維持一致,可用于風(fēng)洞試驗(yàn),而電壓位移特性實(shí)驗(yàn)為風(fēng)洞試驗(yàn)提供了有力的數(shù)據(jù)支持；同時(shí),分析了實(shí)測值與理論計(jì)算值的存在誤差的原因。(3)開展基于壓電激勵(lì)器的典型翼型流動(dòng)分離控制的風(fēng)洞試驗(yàn)。采用PIV先進(jìn)流場測試技術(shù)進(jìn)行了大量的流場測試試驗(yàn),試驗(yàn)結(jié)果表明：在來流風(fēng)速15m/s,迎角18。-24。范圍內(nèi),壓電激勵(lì)器工作時(shí)可以有效地抑制翼型模型的分離流動(dòng),可將氣流分離推遲7。；壓電激勵(lì)器不同的工作頻率對翼型流動(dòng)分離現(xiàn)象的控制效果有一定的影響,且其振幅大小也會對其控制效果產(chǎn)生干擾。通過風(fēng)洞試驗(yàn),驗(yàn)證了壓電激勵(lì)器在流動(dòng)分離控制技術(shù)中應(yīng)用的可行性。
[Abstract]:Flow separation is a complex and universal flow phenomenon in fluid mechanics.In the fields of aeronautics and spaceflight, the phenomenon of flow separation will lead to the decrease of lift, increase of resistance and even the phenomenon of stall during flight, which will affect the safety performance and operation performance of aircraft.Among many flow separation control technologies, piezoelectric actuators have a broad application prospect because of their simple structure, convenient installation and less energy consumption.In this paper, the flow separation control technology based on piezoelectric exciter is studied in this paper. Based on the application of flow control technology, the flow separation control method of airfoil is studied.A separation control method for airfoil flow based on piezoelectric actuator is proposed. The key actuator, piezoelectric actuator, is designed.The piezoelectric effect and the performance parameters of piezoelectric ceramic material are introduced briefly. Based on the basic theory of piezoelectric equation, the theoretical calculation formulas of quasi static response displacement and natural frequency of piezoelectric exciter are established, and its structure size is optimized.At the same time, the designed piezoelectric actuator is simulated and analyzed.The static performance of piezoelectric exciter is close to that of theoretical calculation and numerical simulation, which verifies the accuracy of the theoretical calculation model, and the experimental results of amplitude and frequency characteristics of piezoelectric exciter show that the harmonic response performance of four piezoelectric exciters is basically the same.It can be used in wind tunnel test, and voltage displacement characteristic experiment provides powerful data support for wind tunnel test.The reason of the error between the measured value and the theoretical calculation value is analyzed. The wind tunnel experiment based on piezoelectric exciter is carried out for the separation control of typical airfoil flow.A large number of flow field tests were carried out using PIV advanced flow field test technology. The experimental results show that at the wind speed of 15 m / s, the angle of attack is 18.-24.In the range, the separation flow of airfoil model can be suppressed effectively by piezoelectric exciter, and the separation of airfoil can be delayed by 7.The different working frequency of piezoelectric exciter has certain influence on the control effect of airfoil flow separation phenomenon.And its amplitude will also interfere with its control effect.The feasibility of applying piezoelectric exciter in flow separation control is verified by wind tunnel test.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：V224;V211.74

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本文編號：1754703