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  本文選題：鋸齒形尾緣噴嘴　切入點：射流　出處：《上海交通大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：噴嘴的射流噪聲問題是目前空氣動力學(xué)和氣動聲學(xué)領(lǐng)域的一個研究熱點。鋸齒形尾緣結(jié)構(gòu)具有加工簡單、降噪能力顯著等優(yōu)點，是已經(jīng)應(yīng)用于航空發(fā)動機尾噴管上的被動控制降噪技術(shù)，具有重大的研究意義。 本文借助實驗和數(shù)值計算的手段，，在低馬赫數(shù)情況下，針對圓錐形噴嘴和不同參數(shù)鋸齒形尾緣噴嘴的射流的氣動聲學(xué)特性進行了研究。滲透度和齒數(shù)為本文研究的主要參數(shù)，為捕捉速度剪切層的變化，分別研究了射流的渦量場、速度場、湍流度場以及湍動能云圖分布，并對射流近場噪聲聲壓級分布、遠(yuǎn)場噪聲頻譜和指向性的分布進行了分析。探索了鋸齒形尾緣結(jié)構(gòu)是如何通過改變流場結(jié)構(gòu)從而影響聲音向遠(yuǎn)場的輻射。以下是本文的主要研究工作： （1）搭建了氣動聲學(xué)測試臺架。試驗臺架是在氣動半消聲室中搭建的，主要為進氣消聲風(fēng)洞。通過調(diào)節(jié)輔助風(fēng)機的轉(zhuǎn)速，保證各參數(shù)鋸齒形尾緣噴嘴的勢流核速度一致。滲透度和鋸齒數(shù)目是分析射流流動的主要參數(shù)，可以有針對性地研究鋸齒形尾緣結(jié)構(gòu)對射流氣動聲學(xué)特性的影響； （2）利用數(shù)值計算手段對鋸齒形尾緣噴嘴和圓錐形噴嘴射流場進行了模擬。首先對各種噴嘴劃分了結(jié)構(gòu)化網(wǎng)格，然后進行數(shù)值模擬計算。對比了計算和實驗結(jié)果，驗證了不同參數(shù)鋸齒形尾緣噴嘴對射流流場增混的影響； （3）利用熱線技術(shù)測量了鋸齒形尾緣噴嘴和圓錐形噴嘴的射流流場。分析了不同參數(shù)噴嘴的射流平均流場，包括軸向速度場、湍流度場等，較好地說明了鋸齒滲透度和齒數(shù)對于射流流動結(jié)構(gòu)的影響； （4）用麥克風(fēng)傳聲器測量了噴嘴射流遠(yuǎn)場的散點噪聲分布，并在噴嘴出口區(qū)域進行了近場噪聲場的測量。得到遠(yuǎn)場噪聲頻譜和指向性分布結(jié)果以及近場噪聲的聲壓級云圖，分析了滲透度和鋸齒數(shù)目對于射流近場噪聲聲壓級的影響及其向場聲輻射產(chǎn)生的指向性影響。 （5）利用實驗和數(shù)值分析得到的流場結(jié)果和實驗測得的聲場結(jié)果，以氣動聲學(xué)理論為基礎(chǔ)，詳細(xì)地分析了鋸齒形尾緣噴嘴射流流動和聲學(xué)之間的關(guān)聯(lián)，為選擇具有優(yōu)秀聲學(xué)品質(zhì)的鋸齒形尾緣噴嘴提供了有價值的參考。
[Abstract]:The problem of jet noise is the nozzle aerodynamic and a research hotspot in the acoustic field. The serrated trailing edge structure has the advantages of simple processing, noise reduction ability of significant advantages, is the passive control of noise reduction technology has been applied to the aeroengine nozzle, which has great significance.
In this paper, by means of experiment and numerical calculation method in low Maher number, the jet nozzle and the different parameters of Chevron nozzle aerodynamic acoustic characteristics were studied. The main parameters of permeability and the number of teeth is studied in this paper, to capture changes in velocity shear layer, respectively study the vorticity field the jet, the velocity field, turbulence field and turbulent kinetic energy contours, and the jet near field noise sound pressure distribution, the far field noise spectrum and directional distribution were analyzed. To explore the serrated trailing edge structure is how to change the flow structure so as to affect the sound radiation to the far field. The following is the main research the work of this paper:
(1) to build the aeroacoustic test bench. The test bench is built in a semi anechoic chamber in the gas, mainly for the silencer wind tunnel. By adjusting the auxiliary fan speed to ensure the parameters of Chevron nozzle potential flow velocity. The permeability of the nuclear and the number of main parameters of tooth jet flow, can have the effect of pertinent research of chevron structure on jet acoustic characteristics;
(2) the calculation means of Chevron nozzle and conical nozzle jet flow field was simulated by numerical. Firstly, various nozzles divided the structured grid, and then numerical simulation. Comparing the calculated results and experimental results, verify the different parameters of Chevron nozzle mixing enhancement effect on jet flow field;
(3) the jet flow field of Chevron nozzle and conical nozzle is measured using a hotline analysis techniques. Average flow of jet nozzle with different parameters, including axial velocity field and turbulence field, a better explanation of tooth penetration and tooth number for the influence of jet flow structure;
(4) jet noise scattered far field distribution was measured by a microphone, and the near field noise field measurements at the nozzle exit area. The far field noise spectrum and directional distribution results and the near field noise level images, analyzed the infiltration degree and the number of the sawtooth effect of near field jet the noise level and the radiation field produces sound directivity effects.
(5) the flow field results obtained by experimental and numerical analysis and experimental results to the measured sound field, aerodynamic acoustics theory, a detailed analysis of the association between chevron nozzle jet flow and acoustic, Chevron nozzle has excellent acoustic quality selection provides a valuable reference for.

【學(xué)位授予單位】：上海交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：V231.3;TB535

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本文編號：1600542