后倾式离心风机叶轮结构分析和优化设计
发布时间：2019-06-24 13:59
【摘要】：随着环境污染的日趋加重,空气净化器广泛地受到人们的追捧,与此同时,人们对环境噪声的要求也在不断提高,离心通风机的气动噪声性能得到越来越多的关注。应某公司要求,本文对一款应用于空气净化器的后倾式离心风机进行数值模拟,以得到其内部流动特性和噪声特性,并在现有风机的基础上进行优化设计,以达到:转速为2400r/min、流量为315m~3/h时,在不增加噪声的前提下,保证风压在175Pa以上的要求。本课题研究的主要内容有:(1)现有叶轮的逆向建模。对叶轮实物进行扫描,得到叶轮的点云模型,从而逆向建模得到叶轮模型。(2)现有叶轮的流场模拟以及噪声分析。首先用Hypermesh对模型进行网格划分,然后用Fluent进行流场模拟和噪声分析,得到叶轮的风压分布及数值、噪声分布及数值,从而确定优化方案。(3)建立优化方案。根据该叶轮的分析结果,运用正交试验法,建立9种优化方案。(4)对9种优化方案分别运用UG进行建模、使用Hypermesh划分网格,然后运用Fluent进行稳态分析。(5)将9种方案的稳态结果进行正交试验,得到最佳优化方案,并将最佳优化方案进行瞬态模拟,验证稳态结果。
[Abstract]:With the increasing environmental pollution, air purifiers are widely sought after by people. At the same time, the requirements for environmental noise are also increasing, and more attention has been paid to the pneumatic noise performance of centrifugal ventilators. At the request of a company, this paper carries on the numerical simulation to a backward centrifugal fan used in the air purifier to obtain its internal flow characteristics and noise characteristics, and optimizes the design on the basis of the existing fan, in order to meet the requirements of the rotating speed of 2400r / min and the flow rate of 315m~3/h, without increasing the noise, to ensure that the wind pressure is above 175Pa. The main contents of this paper are as follows: (1) reverse modeling of existing impeller. By scanning the impeller object, the point cloud model of the impeller is obtained, and the impeller model is obtained by reverse modeling. (2) flow field simulation and noise analysis of the existing impeller. Firstly, the model is meshed with Hypermesh, then the flow field simulation and noise analysis are carried out with Fluent, and the wind pressure distribution, numerical value, noise distribution and numerical value of the impeller are obtained, and the optimization scheme is determined. (3) the optimization scheme is established. According to the analysis results of the impeller, nine optimization schemes are established by orthogonal test method. (4) the nine optimization schemes are modeled by UG, the grid is divided by Hypermesh, and then the steady-state analysis is carried out by Fluent. (5) the steady-state results of the nine schemes are orthogonal test to obtain the optimal scheme, and the optimal optimization scheme is simulated to verify the steady-state results.
【学位授予单位】：青岛大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM925.16
[Abstract]:With the increasing environmental pollution, air purifiers are widely sought after by people. At the same time, the requirements for environmental noise are also increasing, and more attention has been paid to the pneumatic noise performance of centrifugal ventilators. At the request of a company, this paper carries on the numerical simulation to a backward centrifugal fan used in the air purifier to obtain its internal flow characteristics and noise characteristics, and optimizes the design on the basis of the existing fan, in order to meet the requirements of the rotating speed of 2400r / min and the flow rate of 315m~3/h, without increasing the noise, to ensure that the wind pressure is above 175Pa. The main contents of this paper are as follows: (1) reverse modeling of existing impeller. By scanning the impeller object, the point cloud model of the impeller is obtained, and the impeller model is obtained by reverse modeling. (2) flow field simulation and noise analysis of the existing impeller. Firstly, the model is meshed with Hypermesh, then the flow field simulation and noise analysis are carried out with Fluent, and the wind pressure distribution, numerical value, noise distribution and numerical value of the impeller are obtained, and the optimization scheme is determined. (3) the optimization scheme is established. According to the analysis results of the impeller, nine optimization schemes are established by orthogonal test method. (4) the nine optimization schemes are modeled by UG, the grid is divided by Hypermesh, and then the steady-state analysis is carried out by Fluent. (5) the steady-state results of the nine schemes are orthogonal test to obtain the optimal scheme, and the optimal optimization scheme is simulated to verify the steady-state results.
【学位授予单位】：青岛大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM925.16
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