Prediction for the Rotor Noise in Hover and Forward Flight Based on CFD/Kirchhoff Method
A solver is developed aiming at predicting efficiently rotor noise in hover and forward flight. In this solver, the nonlinear near-field solutions are calculated by a hybrid approach which in-cludes N-S equations, potential equations and free-wake model. The sound pressure data in the near field can be calculated directly by solving the Navier-Stokes solution, the sound propagation could be computed with the Kirchhoff method. A harmonic expansion approach is presented for rotor far-field noise prediction, which could give an analytical expression of the integral function in the Kirchhoff formula, as a result the interpolation process is simplified and the efficiency and accuracy of the interpolation is improved. Then, the HSI noises of helicopter rotors at different tip Mach numbers and on different observe points are calculated and analyzed, which indicated that the highly directional nature of the rotor high-speed impulsive noise with a maximum value in the plane of rotor, and weakened rapidly with the increasing of the directivity angle.
ZHAO Qi-jun WANG Bo YE Liang 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）