Aerodynamic Noise Simulation of Propeller Fan by Large Eddy Simulation
Aerodynamic Noise Simulation of Propeller Fan by Large Eddy Simulation
复制标题
大涡模拟螺旋桨式风扇气动噪声
DOI：
10.1115/fedsm2007-37145
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
Y. Yamade
中科院分区：
文献类型：
--
作者：
S. Hamada;S. Nakashima;C. Kato;Y. Yamade
本文对用于室外空调部件的半开式螺旋桨风机的非定常流动和气动噪声进行了数值研究。流场计算采用基于大涡模拟(LES)的前缘流动/BLUE方法。采用标准Smagorinsky模型(SSM)和动态Smagorinsky模型(DSM)作为次网格模型。在大涡模拟计算叶片表面压力脉动的基础上，用Curle方程计算了叶片表面的气动噪声。计算得到的风机静压升与实测当量值吻合较好。将叶片下游三个速度分量的时间平均分布与热线风速仪测得的时间平均分布进行了比较，结果表明计算得到的速度分布与实测值吻合较好。但大涡模拟所预测的从叶片表面分离出来的叶尖涡通道并不稳定。最后，预测的远场声谱在100至1000赫兹的频率范围内与测量结果吻合得很好，尽管在较低的频率范围内预测的声压级偏低。
In this paper, unsteady flow and aerodynamic noise are numerically investigated for a half-open type propeller fan used for outdoor air conditioner components. The flow field is calculated by Front Flow/Blue, which is based on Large Eddy Simulation (LES). The Standard Smagorinsky Model (SSM) and Dynamic Smagorinsky Model (DSM) were used as sub-grid scale models. Aerodynamic noise was calculated by Curle’s equation based on the pressure fluctuation on the blade surface computed by LES. The computed static pressure rise of the fan showed reasonable agreement with the measured equivalent. The time-averaged distributions of the three velocity components downstream of the blades were also compared with those measured by hotwire anemometry, which showed satisfactory agreement between the computed and measured velocity profiles. But the tip vortex passage which was detached from the blade surface predicted by LES was not stable as measured by the experiment. Finally, the predicted far-field sound spectrum agrees reasonably well with measurements in a frequency range of 100 to 1000 Hz although the sound pressure level was underpredicted in the lower frequency range.© 2007 ASME