以吸叶机离心风机系统为研究对象，针对吸叶机气动噪声与出口流量的双目标优化问题，运用有限元与试验相结合的方法对其进行分析与优化以达到降低整机噪声的效果。首先运用CFD技术对原吸叶机模型进行流场和声场的仿真分析，并在此基础上提出了长短叶片叶轮优化方案，在拉丁超立方抽样模型的指导下求解了短叶片的多项具体参数，通过融合分析多项参数获得了长短叶片的最优组合方案，最后再次通过仿真与试验相结合的方法对优化方案的实际效果进行了验证。结果表明，短叶片的加入不仅可以保持原有的风机性能，还能够达到降噪1.2dB左右的效果。该方案的提出不仅有效降低了风机噪声，还为产品的降噪优化提供了合理的技术路线，具有广泛的应用价值。
Abstract
To solve the problem of bi-objective optimization for aerodynamic noise and outlet flux, the method combined FEA with experiments are used to study the effect of noise reduction based on the centrifugal fan system of leaf vacuum as the research object. CFD technology is applied to simulation analyze the flow and acoustic field of leaf vacuum model first. Then the improvement plan which adds short blades to the long-blade impeller is proposed. Also, parameters of short blade are determined according to LHS and the optimum combination plan of long-short-blade impeller is proposed according to multi-parameters analysis,which further be determined and verified by the experiment. It can be demonstrated by the results that the joining of short blades can maintain the performance of fan and reduces the noise by 1.2dB. The proposal of this plan not only can effectively reduce the noise, but also can provide a reasonable technology route for the noise analysis of general products. It also endowed with widespread engineering application and prospect.
关键词
噪声分析 /
长短叶片 /
组合寻优
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Key words
noise analysis /
long-short blades /
combination optimization
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