非稳定工况下对旋风机噪声数值模拟及实验研究

Noise Numerical Simulation and Experimental Research of Axial Fan Unstable Conditions

风机是工程实践中应用广泛的叶轮机械之一,其内部流场的流动状况及由此产生的噪声问题对风机的性能和实际应用起到重要的作用。对型号为KDF-5的对旋式轴流风机进行实验研究,分析发现:噪声频谱的波峰幅值随流量的减小逐渐降低,波峰数逐渐减小;在小流量工况下,级间流动以涡流为主,气动噪声以涡流噪声为主,对该风机建模后进行数值分析,得出随着流量的减小,流场逐渐恶化且呈现涡流噪声特性,与实验分析相吻合。

Fan is one of the most widespread impeller-machinery, its internal flow field flowing condition and the resulting noise level directly determine the fan ＇s performance and application. The thesis studies the counter-rotating axial flow fan of KDF-5, through the analysis, we found that the noise spectrum of wave amplitude increases with the reduction of traffic gradually reduce, wave number decreases; In small flow condition, interstage flow is given priority to with eddy, aerodynamic noise is given priority to with the vortex noise, it studies the fan numerically which is compared with experimental analysis. It is concluded that with the decrease of the flow, the flow field gradually deteriorated and presents the vortex noise characteristics, in conformity with the experimental analysis.