基于双向流固耦合的旋翼振动响应及噪声仿真分析OA北大核心CSTPCD

In order to accurately estimate the impact of the fluid-structure coupling effect on the vibration response and noise calculation of rotor blades,a computational fluid dynamics(CFD)model and a high-precision structural finite element model are established in this paper.One-way and two-way fluid-structure coupling calculations are completed based on the weak coupling method,and the Kirchhoff method is adopted to solve the FW-H equation so as to analyze the rotation noise of the rotor blade.Firstly,a finite element model with high precision is established based on a modal test,and the CFD calculation is completed.Then,the numerical results of CFD are transferred to structure by using two grid mapping methods and a quaternion interpolation approach so that one-way static and transient fluid-structure coupling analysis can be acquired.Secondly,the structure's dynamic response and transient flow field are calculated by using the weak coupling method,so we can analyze the difference between the one-way and two-way solution.Finally,the rotation noise of the blade is calculated based on the time-varying aerodynamic pressure,which results from the one-way and two-way fluid-structure calculation.And the magnitude and distribution characteristics of rotation noise calculated by one-way and two-way fluid-structure methods are analyzed and compared.The results show that the dynamic response and noise propagation of the rotor calculated based on the high-precision model and two-way fluid-structure coupling method accord with the law of hovering rotation noise,which can provide reference for blade design,strength check,and noise prediction in the future.