本文關(guān)鍵詞：液下泵流動(dòng)噪聲研究及優(yōu)化設(shè)計(jì)　出處：《江蘇大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 液下泵 壓力脈動(dòng) 流動(dòng)噪聲 優(yōu)化設(shè)計(jì)

【摘要】：近年來(lái),噪聲問(wèn)題日益嚴(yán)重,環(huán)境噪聲成為人們關(guān)注的焦點(diǎn)問(wèn)題。泵作為能量轉(zhuǎn)換領(lǐng)域使用廣泛的通用機(jī)械,在運(yùn)行中產(chǎn)生的噪聲已經(jīng)成為環(huán)境噪聲一個(gè)不可忽略的因素。因此,研究泵運(yùn)行過(guò)程中的噪聲問(wèn)題就顯得非常必要。本文針對(duì)一液下泵分析了其內(nèi)部流場(chǎng)流動(dòng)規(guī)律,探討了液下泵流動(dòng)噪聲的主要聲源,基于聲學(xué)邊界元法,對(duì)偶極子聲源引起的流動(dòng)噪聲進(jìn)行計(jì)算,分析了聲場(chǎng)特性。以流動(dòng)噪聲為主要優(yōu)化指標(biāo),基于響應(yīng)面法對(duì)葉輪進(jìn)行了優(yōu)化設(shè)計(jì),以期本文研究?jī)?nèi)容對(duì)液下泵低噪聲水力設(shè)計(jì)提供一定的參考。本文主要研究?jī)?nèi)容如下:1.闡述本次課題的研究背景,對(duì)流動(dòng)噪聲的研究意義以及研究方法進(jìn)行了介紹。歸納整理了國(guó)內(nèi)外葉輪機(jī)械噪聲研究現(xiàn)狀,總結(jié)了目前葉輪機(jī)械領(lǐng)域?qū)λ吐晫W(xué)性能進(jìn)行優(yōu)化的研究成果。2.介紹了水力設(shè)計(jì)方法,以一液下泵為研究對(duì)象,根據(jù)實(shí)際運(yùn)行要求進(jìn)行水力設(shè)計(jì),通過(guò)ProE對(duì)水力模型進(jìn)行三維建模,簡(jiǎn)要介紹了CFD工作流程。3.利用ICEM對(duì)三維模型劃分全流道計(jì)算網(wǎng)格并進(jìn)行網(wǎng)格無(wú)關(guān)性驗(yàn)證。進(jìn)行外特性實(shí)驗(yàn),對(duì)比了數(shù)值計(jì)算和試驗(yàn)結(jié)果之間的誤差,驗(yàn)證了數(shù)值計(jì)算的可靠性。利用ANSYS CFX對(duì)液下泵進(jìn)行定常和非定常計(jì)算,分析了定常計(jì)算的速度場(chǎng),壓力場(chǎng)等流場(chǎng)特性。在模型泵內(nèi)設(shè)置了12個(gè)壓力脈動(dòng)監(jiān)測(cè)點(diǎn),通過(guò)非定常計(jì)算獲得了監(jiān)測(cè)點(diǎn)的非定常壓力脈動(dòng),通過(guò)快速傅里葉變換得到了壓力脈動(dòng)的頻域特性,分析了壓力脈動(dòng)頻域特性的規(guī)律。4.介紹了聲學(xué)基礎(chǔ)知識(shí)和聲學(xué)計(jì)算方法,分析了液下泵一個(gè)轉(zhuǎn)動(dòng)周期內(nèi)蝸殼偶極子聲源和葉片偶極子聲源,基于聲學(xué)邊界元法,利用聲學(xué)軟件LMS Virtual Lab計(jì)算了液下泵蝸殼偶極子內(nèi)場(chǎng)噪聲和葉片偶極子內(nèi)場(chǎng)噪聲,得到了典型場(chǎng)點(diǎn)的聲壓頻率曲線。5.定義了優(yōu)化目標(biāo)函數(shù),即以液下泵效率和流動(dòng)噪聲作為目標(biāo)函數(shù),以效率不降低和流動(dòng)噪聲最小為響應(yīng)目標(biāo)。通過(guò)單因素實(shí)驗(yàn)分析了葉輪主要參數(shù)對(duì)流動(dòng)噪聲的影響程度,篩選出對(duì)流動(dòng)噪聲影響顯著的葉輪參數(shù)。應(yīng)用Box-Behnken設(shè)計(jì)方法對(duì)篩選出的三個(gè)葉輪敏感參數(shù)進(jìn)行實(shí)驗(yàn)設(shè)計(jì),通過(guò)響應(yīng)面分析法得到了效率和流動(dòng)噪聲回歸模型,通過(guò)聯(lián)立效率回歸方程和流動(dòng)噪聲回歸方程,得到流動(dòng)噪聲最小,效率不降低的優(yōu)化模型葉輪主要影響參數(shù)的值,從而確定最終優(yōu)化模型。通過(guò)比較原模型與優(yōu)化模型的效率和流動(dòng)噪聲聲壓級(jí),驗(yàn)證了響應(yīng)面分析法對(duì)液下泵水力和聲學(xué)性能優(yōu)化的可行性。
[Abstract]:In recent years, the problem of noise is becoming more and more serious, and environmental noise has become the focus of attention. As a wide range of general machinery used in the field of energy conversion, the noise produced in operation has become a factor that can not be ignored in the environment noise. Therefore, it is necessary to study the noise problem in the operation of the pump. In this paper, the flow field of a submerged pump is analyzed, and the main source of the flow noise of submerged pump is discussed. Based on the acoustic boundary element method, the flow noise caused by the dipole source is calculated, and the sound field characteristics are analyzed. Taking the flow noise as the main optimization index, the impeller is optimized based on the response surface method, in order to provide some references for the low noise hydraulic design of the submerged pump. The main contents of this paper are as follows: 1. the background of the research, the significance of the research on the flow noise and the research methods are introduced. The current research status of the turbomachinery noise at home and abroad is summarized, and the research results of the optimization of the hydraulic and acoustic properties in the turbomachinery field are summarized. 2., the hydraulic design method is introduced. A submerged pump is taken as the research object. According to the actual operation requirements, the hydraulic design is carried out. The 3D modeling of the hydraulic model is carried out by ProE, and the CFD workflow is briefly introduced. 3. using ICEM to divide the whole flow path calculation grid and verify the grid independence. The external characteristic experiment is carried out, and the error between the numerical calculation and the test results is compared, and the reliability of the numerical calculation is verified. The steady and unsteady calculation of the underwater pump is carried out by ANSYS CFX, and the velocity field, pressure field and other flow field characteristics are analyzed. 12 pressure pulsation monitoring points were set up in the model pump, and the unsteady pressure pulsation of monitoring points was obtained by unsteady calculation. The frequency domain characteristics of pressure fluctuation were obtained by fast Fourier transform, and the law of frequency domain characteristics of pressure pulsation was analyzed. The 4. introduces the calculation method of acoustic and acoustic analysis of the basic knowledge, a liquid pump rotation cycle spiral dipole source and blade dipole source, acoustic boundary element method based on the liquid pump volute dipole interior noise and leaf interior noise was calculated by the dipole acoustic software LMS Virtual Lab, the sound pressure frequency curve point. 5. the optimization objective function is defined, that is, the efficiency of the pump and the flow noise are used as the objective function, and the efficiency is not reduced and the flow noise is minimum. The influence degree of the main parameters of the impeller on the flow noise is analyzed by the single factor experiment, and the parameters of the impeller which have significant influence on the flow noise are screened. The application of Box-Behnken design method to design the experiments of the three selected impeller sensitive parameters, through analysis by the regression model and the efficiency of flow noise response surface, by means of efficiency of regression equation and regression equation of flow noise, get the minimum value of flow noise, parameter optimization model of the impeller mainly affects the efficiency is lower, so as to determine the final optimization model. By comparing the efficiency of the original model with the optimization model and the sound pressure level of the flow noise, the feasibility of response surface analysis to optimize the hydraulic and acoustic performance of the submerged pump is verified.
【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH38

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