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采用基于S-A(Spalart-Allmaras)湍流模型的脱体涡模拟方法(Detached-eddy simulation,DES),数值模拟研究了偏航状态下的空腔流动。首先,运用DES方法对非偏航状态下的空腔流动进行数值模拟,并和文献结果进行比较,验证该方法模拟空腔流动特性的能力;然后,运用DES方法数值研究偏航状态下的空腔流动,给出声压级的变化。数值研究表明:不同偏航角对空腔底部中心线处声压级产生很大的影响;与非偏航状态相比,在空腔底面中心线的某些位置处,给出了声压级随偏航角的变化规律为:声压级先是随着偏航角增加而缓慢增加,然后大大减小。
Detached-eddy simulation (DES) based on Spalart-Allmaras turbulence model was used to simulate the cavity flow under yaw state. Firstly, the numerical simulation of cavity flow in non-yaw state is carried out by using DES method and compared with the literature results to verify the capability of this method to simulate the cavity flow characteristics. Then, the DES method is used to numerically study the empty Cavity flow gives a change in sound pressure level. Numerical results show that different yaw angles have a great influence on the sound pressure level at the center of the bottom of the cavity. Compared with the non-yaw state, at some positions of the bottom centerline of the cavity, the sound pressure level As the yaw angle changes, the sound pressure level firstly increases slowly with the increase of the yaw angle, and then decreases greatly.