南京航空航天大学学报2011，Vol.43Issue(2)：143-148,6.
旋翼平行桨-涡干扰噪声的参数影响
Parametric Influence on Rotor Parallel Blade-Vortex Interaction Noise
史勇杰 1徐国华 1招启军1
作者信息
- 1. 南京航空航天大学直升机旋翼动力学国家级重点实验室 南京 210016
- 折叠
摘要
Abstract
A new numerical method based on Euler and FW-H equations is developed for calculating rotor parallel blade-vortex interaction (BVI) noise. To preserve the convecting vortex without numerical dissipation) which is caused by numerical discretisation scheme and grid density, the prescribed vortex method is employed. The noise prediction is based on the well-known FW-H equation for acoustic pressure. A parametric study is performed to examine the effects of the vortex strength, miss-distance, rotor tip Mach number and vortex direction on BVI noise, taking the experimental Kitaplioglu model rotor with a parallel BVI as an example. The comparisons between the present calculations and available data are made to validate the method. The results show that increasing miss-distance is an effective approach to reduce BVI noise, and the sound pressure level (SPL) is in inverse proportion to the square of the miss-distance between the vortex and the blade when the miss-distance is greater than the core radius. Decreasing vortex strength changes only the magnitude of noise, not its impulsiveness. The rotor tip Mach number has effects on both noise amplitude and radiation directionality, and SPL is in proportiontO Ma,7tip关键词
旋翼/平行桨-涡干扰/桨-涡干扰噪声/预定涡方法/FW-H方程/Euler方程Key words
rotor/ parallel blade-vortex interaction/ blade-vortex interaction noise/ prescribed vortex method/ FW-H equation/ Euler equation分类
航空航天引用本文复制引用
史勇杰,徐国华,招启军..旋翼平行桨-涡干扰噪声的参数影响[J].南京航空航天大学学报,2011,43(2):143-148,6.
