离心风机气动──声学优化设计方法

A COMPREHENSIVE OPTIMIZATION DESIGN METHOD OF CENTRIFUGAL BLOWER PERFORMANCE ON BOTH AERODYNAMICS AND ACOUSTICS

离散噪声是低比转速高心风机的主要噪声源．本文建立了一个计算低比转速离心风机气动性能及声学性能的优化模型．利用风机的损失模型和离散噪声模型，首先建立一个总的综合评价函数，对风机的离散噪声及效率进行综合评估，然后采用复合形法进行优化．使用此优化模型，可在风机效率变化很小的情况下，使风机的离散噪声下降3－5分贝．

The blade-passing frequency noise, abbreviated to BPF noise, is the main noise source ina low- specific-speed centrifugal blower. This paper presents a comprehensive optimizationmodel that combines with both BPF noisy predicting model and blower efficient predictingmodel. A complex method was applied in solving the new model. Using the new model,BPF noise of centrifugal blowers can be greatly reduced and similarly the loss of efficiencyis small.