摘要
采用计算流体力学与声比拟理论相结合的混合方法,探讨了二维圆柱模型在低马赫数下的非定常绕流诱发的噪声算问题。首先采用雷诺时均Navier-Stokes方程计算了二维圆柱模型的非定常流场,与相同参数条件下的计算数据和实验数据进行对比,得到了可靠的流场数据;然后对流场数据进行处理,利用声比拟理论将流场数据转化为声源,通过求解柯尔(Curle)方程计算了远场噪声。将声场的计算结果与文献中的结果进行了对比,得到了较好的噪声计算结果。
The acoustic analogy theory combined with the computational fluid dynamics approach is used to predict the sound generated by unsteady viscous flow is usually called the hybrid method, a numerical simulation of aero-acoustic noise induced by unsteady flow around a two-dimensional circular cylinder was made using the hybrid method. First, the two-dimensional unsteady flow field was computed by the Navier-Stokes at a low Mach number. The obtained numerical results ot flow field were compared with available experimental results and numerical results, Second, the unsteady flow results were used as an input data to the Curie function. Then the acoustic results far from the circular cylinder model were calculated. The accuracy of the aero-acoustic noise results were generally evaluated by comparing it with corresponding results from other＇ s studies.
出处
《航空科学技术》
2016年第11期7-11,共5页
Aeronautical Science & Technology
关键词
气动噪声
非定常流动
声比拟理论
混合方法
aero-acoustic noise
unsteady flow
acoustic analogy
hybrid method
