热泵干衣机气动噪声特性研究与预测关联式开发OA

To develop a correlation formula for aerodynamic noise and achieve rapid noise prediction for heat pump dryers,a test setup for measuring air volume and aerodynamic noise of dryers is designed and built in this study.Dryers equipped with different fan structures are tested for air volume and aerodynamic noise.The variation patterns of air volume and aerodynamic noise are clarified,and a correlation formula for aerodynamic noise is fitted.The research results show that the key factors affecting air volume are the impeller outer diameter,blade inlet angle,and volute tongue radius,while the primary factors influencing aerodynamic noise are the impeller outer diameter,volute tongue clearance,and blade outlet angle.In the above new noise correlation,the deviation between the predicted and experimental values of air volume is within±15%,and the deviation between the predicted value of noise and the experimental ones is within±2%,indicating that the correlation better reflects the test results of the above samples.Furthermore,three sets of new structural parameter samples are used to test the accuracy of the noise correlation.The results show that the deviation of aerodynamic noise is no more than 1 dB.