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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Mean and time-varying flow measurements on the surface of a family of idealised road vehicles
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Mean and time-varying flow measurements on the surface of a family of idealised road vehicles

机译：一系列理想公路车辆表面的均值和时变流量测量

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摘要

Aerodynamically generated noise in the A-pillar region of a passenger vehicle can make a significant contribution to interior noise and adversely affect passenger comfort. Modern vehicles experience strong surface pressure fluctuations on the side windows due to flow separation around the A-pillar. The objective of this work is to investigate how these fluctuations vary with speeds and also to study the effects of local A-pillar and windshield geometry and yaw angles on the nature of the fluctuations. Pressure fluctuations in cavities (where strong feedback mechanisms can occur) were not studied in this work. Investigations were performed to study the effects of the A-pillar and windshield effective corner radii on the local flow and its potential for noise generation using a group of idealized road vehicle models. Surface mean and fluctuating pressures were measured on the side window in the A-pillar region at different Reynolds numbers and yaw angles. Tests were carried out in the RMIT University Industrial Wind Tunnel. Flow structure was documented using flow visualization. The studies show that Reynolds number sensitivities (based on free-stream flow velocities and body width) in the range of 6.4 x 10(5)-1.5 x 10(6) were minimal. Surface mean and fluctuating pressures scaled well with velocity head and Strouhal number. The magnitudes of the fluctuating pressure coefficients depend largely on local A-pillar radii and can be reduced significantly with the increase of local corner radii. (C) 2003 Elsevier Science Inc. All rights reserved. [References: 23]
机译：乘用车的A柱区域中由空气动力学产生的噪声可能对内部噪声产生重大影响，并对乘客的舒适度产生不利影响。由于A柱周围的流动分离，现代车辆在侧窗上会遇到很大的表面压力波动。这项工作的目的是研究这些波动如何随速度变化，并研究局部A柱和挡风玻璃的几何形状以及偏航角对波动性质的影响。在这项工作中没有研究腔体中的压力波动（可能会发生强烈的反馈机制）。使用一组理想的公路车辆模型进行了研究，以研究A柱和挡风玻璃有效角半径对局部流动的影响及其产生噪声的可能性。在不同的雷诺数和偏航角下，在A柱区域的侧窗上测量了表面平均值和脉动压力。在RMIT大学工业风洞中进行了测试。使用流可视化记录流结构。研究表明，雷诺数敏感度（基于自由流的流速和体宽）在6.4 x 10（5）-1.5 x 10（6）范围内最小。地表平均压力和脉动压力与速度扬程和Strouhal数成比例。波动压力系数的大小在很大程度上取决于局部A柱半径，并且可以随着局部转角半径的增加而显着减小。 （C）2003 Elsevier Science Inc.保留所有权利。 [参考：23]

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