高速鉄道台車部周りの二重極音源に関する数値解析(流体工学, 流体機械)

概要

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In this paper, the distribution of dipole sound sources at the bogie section of high speed trains are predicted numerically. The three-dimensional unsteady flow around a train is solved by the large eddy simulation technique. The time history of vortices show that the unstable shear layer separated at the leading edge of the bogie section sheds vortices periodically. These vortices travel leeward while growing to finally impinge upon the trailing edge of the section. A compact Green's function adapted to the shape is also given numerically by solving Laplace equation. By coupling the instantaneous flow properties with the compact Green's function, the distribution of dipole sources is obtained. The results show that a strong dipole source is generated at the trailing edge of the bogie section where the shape changes greatly and the variation of flow with time is also great. On the other hand, the bottom of the bogie section where the shape does not change, or leading edge and boundary layer where a variation of flow in time is small, can not generate a strong dipole source.
一般社団法人日本機械学会の論文
2001-12-25