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Study of Aerodynamic Noise induced by Shock Waves in Supersonic Flows and Development of a Method for Reducing the Noise

超音速流中冲击波引起的气动噪声研究及降噪方法的开发

基本信息

批准号：
11650177
负责人：
AOKI Toshiyuki
金额：
$ 2.37万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650177/
关键词：
High Speed Train Tunnel Noise Reduction Ballast Track Pressure Wave Micro-Pressure Wave Porous Material Boundary Layer

项目摘要

1. To accomplish the railway tunnel simulator, a fast opening gate valve was developed. we analyzed the performance of the fast opening gate valve by using a super high-speed video camera. The results show that the opening time of the gate valve decreases when the initial pressure in the actuating chamber increases. And the relation between the initial pressure in the actuating chamber and the characteristics of the compression wave such as the maximum pressure gradient was made clear.2. To study the ballast effect on distortion of pressure wave propagating in high-speed railway tunnel, we made a high-speed railway tunnel simulator using a fast opening gate valve. An experimental investigation was carried out to clarify the distortion of a propagating compression wave in a model tunnel with various porous material wall. Experimental data shows the possibility of the present alleviative method, and the effects of the porous material wall is clear.3. The compression waveform in the propagating process are studied numerically by second-order symmetric TVD method scheme, taking both fluid friction on the flat wall and the effect of the ballasted track into consideration. The waveform of the compression wave in the tunnel calculated by the present two-layer method is in good agreement with that of the field test data on both track tunnels, so that the present numerical method of calculation seems to be reasonable.

1.为实现铁路隧道模拟器，研制了一种快开闸阀。利用超高速摄像机对快开闸阀的性能进行了分析。结果表明，闸阀的开启时间随工作腔初始压力的增大而减小。明确了作动室初始压力与压缩波特性如最大压力梯度之间的关系.为研究高速铁路隧道中道碴对压力波传播畸变的影响，制作了一个带快开闸阀的高速铁路隧道模拟器。通过实验研究了不同多孔材料壁面对压缩波传播的影响。实验数据表明了该方法的可行性，多孔材料壁面的影响是明显的.采用二阶对称TVD方法，考虑了平壁面上的流体摩擦和有碴轨道的影响，对轨道传播过程中的压缩波形进行了数值研究。用本文的两层法计算的隧道内压缩波波形与两条轨道隧道的实测数据吻合较好，说明本文的数值计算方法是合理的。