Numerical Studies on Blade-Vortex Interaction Noise

• Main Authors: Yan-Shin Chin, 秦雅嫺
• Other Authors: San-Yih Lin
• Format: Others
• Language: en_US
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/28872413388448564030

博士 === 國立成功大學 === 航空太空工程學系 === 82 === A transonic blade-vortex interaction is studied by a Euler solver in detail. Finite volume methods of (modified) Osher & Chakravarthy (MOC and OC) and modified Sanders & Li (MSL) and a finite element method of Lin & Chen (LC) are investigated and compared. Higher-order accuracy is obtained with the approach of monotonic upwind-centered scheme for conservation laws (MUSCL). The aeroacoustic problems tested include the oblique shock reflection, linear wave convection, monopole radiation problem, vortex preservation test, vortex-shock interaction, and blade-vortex interaction. Based on the order of accuracy, stability, grid nonuniformity, and dissipation property of each scheme, we concluded that the MOC scheme is the most suitable scheme among the schemes tested in the aeroacoustic computations. We also concluded that the MSL scheme needs to be improved on the convergence rate and the small wiggle property before it is used to compute the aeroacoustic problems. In the blade-vortex interaction problem, the newly found sound waves, transonic and compressibility waves, are simulated in this paper.