车辆表面脉动压力的试验研究

对车辆表面脉动压力与气流噪声的关系进行了讨论，说明了偶极子源噪声在车辆气流噪声中占主导地位，而车辆气流噪声中的偶极子源噪声又取决于车辆的表面脉动压力，阐述了研究车辆表面脉动压力对进一步研究和控制车辆气流噪声具有的重要意义。在此基础上，对车辆表面脉动压力的分布、频率特性及其与车速的关系进行了试验研究，得到了一些有意义的结论。

Experimental Analysis of Fluctuating Pressure on Outside of Vehicle

A relationship between fluctuating pressure on outside surface of vehicle (FPOSV) and aerodynamic noise around vehicles is depicted in this paper. The aerodynamic noise around vehicles is dominated by dipole source that is determined by FPOSV. Therefore, FPOSV is important in control of aerodynamic noise around vehicles. A series of experiments about the map and spectra of FPOSV was carried out and the relationship between FPOSV and vehicle speed were investigated. From the experiments we concluded that the fluctuating pressure tended forward increasing with the fourth power of flow speed, meanwhile the aerodynamic noise of dipole toward increasing with the sixth power of flow speed; the aerodynamic noise around vehicles was dominated by lower frequency noise and tended toward decreasing with the increase of frequency, which coincides with the aerodynamic noise spectra of vehicles.