【摘要】 针对离心风机噪声试验研究成本大，产品设计生产周期长等问题，探究了离心风机辐射噪声数值模拟的准确性。基于声学有限元方法，采用数值计算与试验相结合的方式，通过FLUENT软件进行非定常计算得到声源信息，采用ACTRAN有限元法计算风机的气动噪声，并与试验值进行对比分析。研究表明，基频噪声仿真值与试验值分别为86.69,89 dB，误差在4%左右，总声压级分别为94.38,93.804 dB，误差为0.6%。因此声压频谱吻合较好，仿真值与试验值一致性较高，可以进行噪声预测。此外，对不同转速下风机对噪声的影响进行讨论，以验证预测分析的实用性。结果表明，叶轮转速升高，对其离散噪声的影响显著，随着叶轮转速提高，其压差变化越来越显著，所引起的旋转噪声越来越大，基频噪声升高了19.29 dB，声压级变化明显。因而，转速对离散噪声的影响较大，合理选择转速来控制噪声是一种简单有效的方法。通过上述研究的数值计算方法，可以一定程度上减小试验模型反复铸造、调试的时间和成本，为进一步优化风机气动噪声，降低噪声提供思路。更多还原

【Abstract】 The accuracy of numerical simulation of radiated noise of centrifugal fan was explored in view of the problems of high cost of experimental research and long period of product design and production. Based on the hybrid calculation method, the combination of numerical calculation and experiment was adopted. The Fluent software was used for unsteady calculation to obtain the source information of sound. The ACTRAN finite element method was used to calculate the aerodynamic noise of the fan, and compared with the experimental value. The research shows that the fundamental frequency noise of the simulation value and the test value is 86.69 d B and 89 dB, respectively, with an error of about 4%. The total sound pressure level is 94.38 dB and 93.804 dB,and the total sound pressure level error is 0.6%. Hence, the sound pressure spectrum is in good agreement, the simulation value is basically consistent with the test value, and the numerical simulation can predict the noise. In addition, the influence of fan on noise at different rotational speeds was discussed to verify the practicability of predictive analysis. The results show that the increase of impeller speed has a significant influence on the discrete noise. As the impeller speed increases, the pressure difference changes more and more significantly, resulting in more and more rotary noise, the fundamental frequency noise increases by 19.29 dB, and the sound pressure level changes significantly. Therefore, rotational speed had a great influence on discrete noise, and it is a simple and effective method to choose reasonable rotational speed of fan to control noise. The numerical calculation method mentioned above can reduce the time and cost of repeated casting and debugging of the experimental model to a certain extent, and provide ideas for further optimization of fan aerodynamic noise and noise reduction.更多还原