【作者】 袁锋； 李珑； 竺晓程； 杜朝辉；

【Author】 YUAN Feng, LI Long, ZHU Xiao-cheng, DU Zhao-hui (Shanghai Jiaotong University, School of Mechanical Engineering, Shanghai 200030)

【机构】 上海交通大学机械与动力工程学院；

【摘要】 采用B-L紊流模型对平板、凹面和凸面上气膜冷却效率进行了数值模拟,对不同吹风比(0.5、1.0)、冷却孔长径比(L/D=1.16、2.91)和喷射角度(35°、90°)情况下平板、凸面与凹面的气膜冷却效率进行了对比。同时,研究了曲面曲率的变化对气膜冷却效率的影响。结果表明,射流角度的增大和吹风比的增大都会导致平面、凸面和凹面沿冷却孔下游的冷却效率降低,而冷却孔长径比的变化对凸面和凹面冷却效率的影响较小。沿冷却孔下游和侧向,凸面的冷却效率最高,平板次之,凹面冷却效率最小。随着凸面曲率的增大,沿冷却孔下游冷却效率增大,而凹面却正好相反。更多还原

【Abstract】 The B-L turbulent model is employed to compute film cooling effectiveness of flat, concave and convex surfaces. Systemically studies the influence of different parameters on the film cooling effectiveness of concave and convex surfaces by varying the blowing rate (M=0.5, 1.0), the length-to-diameter ratios (L/D=1.16, 2.91) and the injection angle (35°, 90°) for the same mainstream conditions and compares these with the results of flat plate. Last, studies the influence of different curvature on the film cooling effectiveness of concave and convex surfaces. Results show that increasing the injection angle and blowing rate decreases the cooling effectiveness of flat, concave and convex surfaces and varying the length-to-diameter ratios has small effect on concave and convex surfaces. Along mainstream and cross-stream behind holes, film cooling is more effective on convex surface than on a flat or concave surface. The cooling effectiveness of convex surface improves as curvature is increased, but it is in contrast on concave surface.更多还原