• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Aerodynamics >Spatio-temporal analysis of wall pressure fluctuations on several automotive side-glasses
【24h】

Spatio-temporal analysis of wall pressure fluctuations on several automotive side-glasses

机译：几种汽车副镜壁压力波动的时空分析

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

For modern cars, aerodynamic noise is becoming the major source of annoyance during peri-urban trips (above 100 km/h) and for frequencies higher than 400 Hz. The origin of the aerodynamic noise in the cabin is the flow around the vehicle and more particularly in the neighbourhood of the front side glass (side mirror wake, A-pillar vortex ...). A complex and unsteady pressure field excites the glass panels which vibrates and radiates noise inside the cabin. The evaluation of the acoustic radiations induced by the external flow in the car is a challenging issue. In this article, an in-depth experimental and computational study of wall pressure fluctuations (WPF) generated by turbulent flow in the side glass region of different A-pillar architectures of an automobile is presented. The vehicles are placed in an anechoic wind tunnel at a velocity corresponding to highway trips (i.e., 140 km/h) at 0 and 10 yaw angle. The WPF measurements are obtained using flush-mounted microphones located on the side glass. Fifty to 90 microphones are used according to the window shape. The numerical results are obtained with a time-explicit fluid flow solver based on the Lattice Boltzmann method (LBM); the wall pressure power spectral density (PSD) results are analysed and compared to experimental data. The flow topologies induced by the different A-pillar architectures are compared; the effect of the yaw angle is analysed. The spatio-temporal characteristics of the computed WPF are then studied by examining the evolution of two points' coherence and convective velocity when one moves on the side glass.
机译：对于现代汽车，在城市郊外旅行（高于100 km / h）和频率高于400 Hz时，空气动力学噪声正成为烦人的主要来源。机舱内空气动力噪声的产生源于车辆周围的气流，尤其是在前侧玻璃附近（后视镜尾流，A柱涡流...）。复杂而不稳定的压力场会激发玻璃板振动，并在机舱内辐射噪声。对汽车外部流动引起的声辐射的评估是一个具有挑战性的问题。本文对汽车不同A柱结构的侧玻璃区域中的湍流产生的壁压力波动（WPF）进行了深入的实验和计算研究。车辆以0和10度偏航角下对应于高速公路行驶的速度（即140 km / h）放置在消声风洞中。使用位于侧玻璃上的齐平安装的麦克风获得WPF测量值。根据窗口形状使用50至90个麦克风。使用基于Lattice Boltzmann方法（LBM）的时间显式流体流动求解器获得了数值结果。分析了壁压功率谱密度（PSD）的结果，并将其与实验数据进行了比较。比较了由不同的A柱架构引起的流动拓扑。分析了偏航角的影响。然后，通过检查两点的相干性和对流速度在侧玻璃上移动时的演变来研究计算出的WPF的时空特性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号