| 基于瞬态液晶测量技术的收缩-扩张形孔 |
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| 引用本文： | 刘存良,朱惠人,白江涛,许都纯.基于瞬态液晶测量技术的收缩-扩张形孔[J].航空学报,2009,30(5). |
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| 作者姓名： | 刘存良 朱惠人 白江涛 许都纯 |
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| 作者单位： | 西北工业大学,动力与能源学院,陕西,西安,710072 |
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| 基金项目： | 国家“973”基础研究(2007CB707701) |
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| 摘 要： | 采用一种进行全表面测量的瞬态液晶测量技术测量了新型气膜孔(收缩-扩张形孔)的气膜冷却特性,研究了动量比对冷却效率和换热系数的影响,并与传统的圆柱形孔气膜冷却特性进行了对比,结果表明:收缩-扩张形孔中心线附近区域的冷却效率相对较低,而两孔之间区域的冷却效率相对较高,与圆形孔分布规律相反;在上游区域,两孔中间区域的换热系数比相对孔中心线附近区域较高,而在下游区域,两孔中间区域的换热系数比相对孔中心线附近又较低,与圆形孔相比也有较大不同。相对于圆柱形孔,收缩缝形孔的平均换热系数比在上游较高,在下游较低;收缩-扩张形孔喷出气膜对下游壁面区域的有效覆盖率远大于圆柱形孔,其展向平均冷却效率明显高于圆柱形孔;收缩-扩张形孔在动量比为2时的平均冷却效率最高。
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| 关 键 词： | 气膜冷却 收缩-扩张形孔 瞬态测量 窄带液晶 冷却效率 换热系数 |
Film Cooling Characteristics of Converging-expanding Hole with Transient Liquid Crystal Measurement Technique |
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| Liu Cunliang,Zhu Huiren,Bai Jiangtao,Xu Duchun.Film Cooling Characteristics of Converging-expanding Hole with Transient Liquid Crystal Measurement Technique[J].Acta Aeronautica et Astronautica Sinica,2009,30(5). |
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| Authors: | Liu Cunliang Zhu Huiren Bai Jiangtao Xu Duchun |
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| Abstract: | Film cooling characteristics of a converging-expanding hole were measured using a transient liquid crystal measurement technique which could process nonuniform initial temperatures. The impact of momentum flux ratio was tested, and comparison was carried out between the converging slot-hole and cylindrical hole. The results show that the film cooling characteristic distributions of a converging-expanding hole are quite different from those of cylindrical holes because of their different flow structures. Jet... |
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| Keywords: | film cooling converging-expanding hole transient measurement liquid crystal film cooling effectiveness heat transfer coefficient |
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