Simulation of road vehicle natural environment in a climatic wind tunnel

S.A.A.Abdul Ghani , A. Aroussi , E. Rice
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引用次数: 36

Abstract

This paper describes the development of natural climatic conditions in a closed loop full-scale automotive wind tunnel. The tunnel simulates wind, different rainfalls, a range of air temperature as well as several road conditions. It generates, under controlled heat loading, wind speeds of up to 50 km h with different approach boundary conditions, rainfalls from drizzle to cloudburst, controlled air temperature over the range of 30–20°C below zero and road inclines up to 15° in any direction. The design and optimization process of the tunnel functions is outlined and examples of its use in vehicle development are given. The need to comply with the standardised recommended practice requirements and a compact design are important features of the tunnel. The tunnel provides an important test bed for close scrutiny of the relationship between rainwater ingress, vehicle speed, road condition, heat loading and vehicle geometry. The tunnel can also be used to study vehicle thermal management, vehicle thermal comfort, engine cold starting, and wipers efficiency in severe cold weather. Computational fluid dynamic (CFD) simulation is used to optimize and assess the performance of a number of key tunnel components. To validate the CFD developed model, the resulting flow field around a bluff body placed on the tunnel is closely scrutinized and verified against well-established and published data. Moreover, the numerical prediction is experimentally validated using laser sheet visualisation (LSV). The resulting tunnel is approximately 9.5 m long, 9.5 m high and 3 m wide.

气候风洞中道路车辆自然环境的模拟
本文描述了全尺寸闭环汽车风洞中自然气候条件的变化。这条隧道模拟了风、不同的降雨、一系列的气温以及几种道路状况。在可控制的热负荷下,它可在不同的接近边界条件下产生高达每小时50公里的风速,降雨范围由毛毛细雨到大暴雨,控制气温在零下30-20°C之间,道路在任何方向的倾斜度可达15°。概述了隧道功能的设计与优化过程,并给出了其在车辆开发中的应用实例。该隧道的重要特点是必须符合标准化的建议作业规定,并采用紧凑的设计。该隧道为深入研究雨水入渗、车速、路况、热负荷和车辆几何形状之间的关系提供了重要的试验台。该隧道还可用于研究车辆热管理、车辆热舒适性、发动机冷启动和严寒天气下雨刷效率。计算流体力学(CFD)模拟用于优化和评估一些关键隧道构件的性能。为了验证CFD开发的模型,对放置在隧道上的钝体周围的流场进行了仔细检查,并根据已发布的数据进行了验证。此外,利用激光薄片可视化技术(LSV)对数值预测进行了实验验证。由此产生的隧道大约长9.5米,高9.5米,宽3米。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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