小长径比直孔内的流场实验研究  

Flow field measurements in normal hole with low length-to-diameter ratio

作　　者：蔡卫军[1] 宋晓伟[1] 刘高文[1] 许都纯[1] 刘松龄[1] 

机构地区：[1]西北工业大学航空动力与热力工程系,陕西西安710072

出　　处：《推进技术》2003年第5期440-443,共4页Journal of Propulsion Technology

基　　金：Rolls Royce公司资助

摘　　要：用五孔探针对小长径比、进出口倒角后的直孔内的流场情况进行了详细的测量,着重研究不同速比和雷诺数对孔内流动规律的影响。实验结果表明:速比的变化会显著改变孔内的流场结构,从而影响孔的流量系数;而同一速比下,雷诺数变化的影响则相对较小。在孔壁附近存在着气流的反卷现象,该结果有助于深入了解气膜冷却的内在机理。Experimental results were presented to describe the flow behavior in the normal hole with a sharp square-edged inlet/outlet, and a low length-to-diameter ratio value. Measurements were performed using a straight five-hole probe. Important aspects of the study include: (l) flow characteristic of the hole and its discharge coefficient are varied strongly with the velocity ratio. (2) Reynolds number does not play the primarily role while comparing to the velocity ratio. (3) reversed flow occurs near the wall, which is helpful to the detailed analysis of film cooling physical mechanisms.

关 键 词：流动分布 流量系数 薄膜冷却 速度测量 五孔探针 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]