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采用大涡模拟结合FW-H方程的混合方法对低叶尖马赫数开式叶轮流场和气动噪声进行全尺寸模拟,并对此类开式叶轮气动声源特性进行研究。声压级在空间和频域上的分布表明:此类开式叶轮声源包括叶片转动时产生的单极子声源、偶极子声源和叶片尾涡产生的四极子声源,基本不存在桨涡干涉噪声,尾涡四极子声源耗散快,无法传输到叶轮下游,在叶轮下游区域未见明显四极子声源;单极子噪声占开式叶轮气动噪声的大部分,偶极子噪声占重要部分,偶极子声源主要集中在叶顶的前缘和尾缘区域,前缘声压大于尾缘声压,吸力面声压大于压力面声压。
The large-eddy simulation and the FW-H equation hybrid method were used to simulate the full-scale flow field and aerodynamic noise of low-tip Mach number open-impeller, and the aerodynamic characteristics of the open-impeller were studied. The distribution of sound pressure level in space and frequency domain shows that the source of such open impeller includes the monopole sound source generated when the blade rotates, the dipole sound source and the quadrupole sound source produced by the blade wake vortex. The basic There is no interference of paddle vortex noise, the vortex of the vortex quadrupole dissipates fast and can not be transmitted to the downstream of the impeller, and no obvious quadrupole sound source is found in the downstream of the impeller. The monopole noise accounts for most of the aerodynamic noise of the open impeller , Dipole noise accounts for a significant part of the dipole sound source is mainly concentrated in the leading and trailing edge of the tip region, the leading edge sound pressure is greater than the trailing edge of the sound pressure, suction surface sound pressure is greater than the pressure surface sound pressure.