Effective train nose shape for reducing micro-pressure wave

摘要

The principle of alleviation of "micro-pressure wave" is to decrease the pressure gradient of the compression wave generated by a train entering a tunnel. "Optimum nose shape" minimizes the pressure gradient under the given conditions of train cross-sectional area and nose length. After reviewing the results of numerical optimization of the nose using CFD, we performed aeroacoustic analysis. As a result, the characteristics of the optimum area distribution and the influence of the offset of the train axis was clarified.