平板气膜冷却孔中心线上绝热效率的实验研究

Experimental Research on Adiabatic Efficiency on Center Line of Plate Air Film Cooling Hole

以优化冷却孔射流角度和射流参数为主要实验目的,将平板气膜冷却作为研究对象,应用红外热像仪作为温度监测手段,研究不同角度的简单和带有复合角的复杂圆形孔射流对平板中心线上气膜冷却绝热效率的影响。在吹风比分别为M=0.5、1.0、1.5时,实验研究了简单圆形孔射流角度α=35、60、90°和带复合角β=15、60、90°圆形孔的不同排列下平板中心线上气膜冷却的绝热效率。结果表明:在简单孔情况下,射流角α=35°时绝热效率较好,带复合角情况下,β=90°时较高。双排布置时绝热效率比单排的要高很多,其中插排最佳。

With the optimization of jet flow angle and parameters of cooling hole as the main experi- mental objective and plate air film cooling as the research object, this research studies the influence of jet flow of simple circular holes and complicated circular holes with compound angle with different angles on air film cooling on the center line of plate by using thermal infrared imager as temperature monitoring means. When the blowing ratio M is respectively 0. 5, 1.0 and 1.5, the experiment studies the adiabatic efficiency of air film cooling on the center line of plate under different arrangements when jet flow angle of simple circular hole α=35°,60°,90° and jet flow angle of complicated circular hole with compound angle β= 15°,60°,90°. The result shows that adiabatic efficiency is higher when jet flow angle α=35° under the con- dition of simple hole and adiabatic efficiency is higher when β= 90° under the condition of hole with com- pound angle~ adiabatic efficiency under double-row layout is far higher than that under single-row layout; adiabatic efficiency is the highest under insert row. Key words, air film cooling, adiabatic efficiency, hole pattern, experimental research