液下泵流动噪声研究及优化设计

发布时间：2017-12-27 11:10

本文关键词：液下泵流动噪声研究及优化设计　出处：《江苏大学》2017年硕士论文　论文类型：学位论文

【摘要】：近年来,噪声问题日益严重,环境噪声成为人们关注的焦点问题。泵作为能量转换领域使用广泛的通用机械,在运行中产生的噪声已经成为环境噪声一个不可忽略的因素。因此,研究泵运行过程中的噪声问题就显得非常必要。本文针对一液下泵分析了其内部流场流动规律,探讨了液下泵流动噪声的主要声源,基于声学边界元法,对偶极子声源引起的流动噪声进行计算,分析了声场特性。以流动噪声为主要优化指标,基于响应面法对叶轮进行了优化设计,以期本文研究内容对液下泵低噪声水力设计提供一定的参考。本文主要研究内容如下:1.阐述本次课题的研究背景,对流动噪声的研究意义以及研究方法进行了介绍。归纳整理了国内外叶轮机械噪声研究现状,总结了目前叶轮机械领域对水力和声学性能进行优化的研究成果。2.介绍了水力设计方法,以一液下泵为研究对象,根据实际运行要求进行水力设计,通过ProE对水力模型进行三维建模,简要介绍了CFD工作流程。3.利用ICEM对三维模型划分全流道计算网格并进行网格无关性验证。进行外特性实验,对比了数值计算和试验结果之间的误差,验证了数值计算的可靠性。利用ANSYS CFX对液下泵进行定常和非定常计算,分析了定常计算的速度场,压力场等流场特性。在模型泵内设置了12个压力脉动监测点,通过非定常计算获得了监测点的非定常压力脉动,通过快速傅里叶变换得到了压力脉动的频域特性,分析了压力脉动频域特性的规律。4.介绍了声学基础知识和声学计算方法,分析了液下泵一个转动周期内蜗壳偶极子声源和叶片偶极子声源,基于声学边界元法,利用声学软件LMS Virtual Lab计算了液下泵蜗壳偶极子内场噪声和叶片偶极子内场噪声,得到了典型场点的声压频率曲线。5.定义了优化目标函数,即以液下泵效率和流动噪声作为目标函数,以效率不降低和流动噪声最小为响应目标。通过单因素实验分析了叶轮主要参数对流动噪声的影响程度,筛选出对流动噪声影响显著的叶轮参数。应用Box-Behnken设计方法对筛选出的三个叶轮敏感参数进行实验设计,通过响应面分析法得到了效率和流动噪声回归模型,通过联立效率回归方程和流动噪声回归方程,得到流动噪声最小,效率不降低的优化模型叶轮主要影响参数的值,从而确定最终优化模型。通过比较原模型与优化模型的效率和流动噪声声压级,验证了响应面分析法对液下泵水力和声学性能优化的可行性。
[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.
【学位授予单位】：江苏大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH38

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