摘要:
在激波风洞中马赫数6.1、雷诺数6.2×107/m 的流场条件下,基于平板模型开展了防热瓦缝隙热流测量实验,研究了湍流平板边界层情况下 T 字和十字2种布局缝隙的缝壁热流分布,以及流向角、缝隙宽度、缝隙深度和缝口台阶高度的变化对缝隙热环境的影响。结果表明,缝口边缘特别是 T 字口迎风壁存在很高的局部热流,测量峰值达到11.6倍平板值,流向角为30°~60°时2种布局缝隙的热环境相对较好,缝壁及缝底热流随缝隙宽度和缝口台阶增大而升高。
关键词:
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防热瓦
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缝隙
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台阶
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气动加热
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风洞实验
Abstract:
The characteristics of aerodynamic heating on tile-to-tile gaps in the flow of Mach number 6.1 with Reynolds number of 6.2×10 7/m was investigated in shock tunnel.Thermal in-sulating tiles and tile-to-tile gaps,arranged in T style and + style,were simulated on a flat plate model.Turbulent boundary layer was obtained upstream of the tile gaps by using a grit strip near the leading edge of the flat plate.Heat transfer was measured at the foward faces,side faces and the bottom surface of these gaps,and also at the tiles’surface.The effect of external flow angu-larity,gap width,gap depth and misalignment between tiles on the heating distribution in gaps was also examined.Experimental data reveal that the peak heating is most likely to appear on the gap top edges,especially on the forward face at the T-crossing,where a localized peak heating with amplitude approximately 11.6 times larger than that of the flat plate case was measured.It is also indicated that both the localized peak heating and the overall heating are reduced when the flow angle is adjusted to be 30°~60°,and are raised with the increasing gap width and tile-to-tile step height.
百度学术
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