Computational Investigation of Parametric Effects on Isolated Blade-Vortez Interaction Noise
A numerical method for modeling the aerodynamic interactions between rotor blades and an independently generated vortex (BVI) was developed. In this method, the unsteady Euler equations in inertial coordinate system were adopted for capturing the features of rotor BVI flow and the overset grids technique was used for multi-zone solution and information exchange in forward flight. To incorporate the effects of the vortex in the solution, a generalized grid-velocity approach was presented to simplify the computations. The acoustic prediction was based on the well-known FW-H equation for acoustic pressure. By this method developed, a parametric study was performed to examine the effects of the vortex strength, miss-distance, core radius and oblique interaction on BVI noise. The simulation results indicate that the increase in miss-distance, core radius, obliqueness of interaction, interaction angle in blade-shaft plane is effective approach to reduce BVI noise and increase high noise encompassed area. While, the decrease in vortex strength changes only the magnitude of noise, not its distribution in different harmonics. This research also indicates that oblique interaction in rotor plane has a significant effect on radiation directionality, while other parameters shows little impact on it.
Shi Yong-jie ZHAO Qi-jun XU Guo-hua
National Key Laboratory of Science and Technology on Rotorcraft Aeromechanics Nanjing University of Aeronautics and Astronautics Nanjing, Jiangsu, 210016, China
国际会议
南京
英文
1-9
2009-10-14（万方平台首次上网日期，不代表论文的发表时间）