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利用数值模拟及实验方法对涡轮叶冠间隙流场换热特性进行了研究,分析静止状态下叶尖泄漏流雷诺数、前后孔岀流比、叶尖间隙等参数对叶冠的表面传热系数的影响.结果表明:叶冠转速的变化对表面传热系数影响较小;随着泄漏流雷诺数的增加,叶冠的平均表面传热系数增大;平均表面传热系数随前、后孔岀流比增大而增大,其中前孔出流比的影响较为明显;叶尖间隙减小,平均表面传热系数增大,并且随叶尖间隙的减小,增长越来越快.将计算与实验结果进行了比较,吻合良好,误差小于10%.
Numerical simulation and experimental methods were used to study the heat transfer characteristics of turbomachinery crevice clearance. The effects of parameters such as Reynolds number of tip leakage flow, front-back flow rate and tip clearance on the surface heat transfer coefficient The results show that the change of crown speed has little effect on the surface heat transfer coefficient, and the average surface heat transfer coefficient increases with the increase of Reynolds number of leakage flow. The average surface heat transfer coefficient increases with the front and back holes岀 flow rate increases and increases, of which the front hole outflow ratio of the more obvious impact; tip clearance decreases, the average surface heat transfer coefficient increases, and with the tip clearance decreases, the growth is faster. Calculation and experimental results were compared, good agreement, the error is less than 10%.