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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 >Experimental study of convection and radiation interaction in a headlight model using pressure variation
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Experimental study of convection and radiation interaction in a headlight model using pressure variation

机译:利用压力变化的前照灯模型中对流和辐射相互作用的实验研究

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摘要

An experimental study is presented on the coupled heat transfer of natural convection and specular reflected radiation in an automotive headlight. To simplify the geometry, an automotive reflector with a standard H7 bulb is arranged inside a cylindrical enclosure, representing housing and lens of the headlight. To vary the coupling effects between the convective and radiative heat transfer, the pressure inside the enclosure is reduced and convection is limited. Since the Rayleigh number scales according to Ra similar to p(2) with pressure, the variation of Ra extends over six-orders of magnitude. In the experiments, the temperature distribution at the lens is investigated in dependence of the Ra number, the aspect ratio and the emission coefficient. It is found that for low emission coefficients of the reflector, the influence of the radiation heat flux exceeds convection effects. On the other hand, for high emission coefficients of the reflector, both effects are of the same order of magnitude. The interaction significantly affects the temperature and location of the hot spot on the lens. (c) 2007 Elsevier Inc. All rights reserved.
机译:对汽车前灯中自然对流和镜面反射辐射的耦合传热进行了实验研究。为了简化几何形状,将带有标准H7灯泡的汽车反射器布置在圆柱形外壳内,代表前照灯的外壳和透镜。为了改变对流传热与辐射传热之间的耦合效应,应降低外壳内部的压力并限制对流。由于瑞利数根据Ra随压力缩放与p(2)相似,因此Ra的变化范围扩展了六个数量级。在实验中,根据Ra数,纵横比和发射系数研究了透镜处的温度分布。发现对于反射器的低发射系数,辐射热通量的影响超过对流效应。另一方面,对于反射器的高发射系数,两种作用具有相同的数量级。相互作用会显着影响透镜上热点的温度和位置。 (c)2007 Elsevier Inc.保留所有权利。

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