气冷凹腔支板引气孔面积对冷却效果的影响

Effect of Air Vent Area on Cooling Performance of Support Plate with Cavity in Integrated Afterburners

为了对一体化气冷凹腔支板更好地进行冷却,采用三维数值模拟方法,研究外涵引气孔面积对巡航工况下一体化凹腔支板气动热力性能的影响,得到了引气率、壁面平均冷却效果、壁面温度、一体化凹腔支板内流局部总压恢复系数随引气孔面积的变化规律。结果表明:在研究的参数范围内,引气率随着引气孔面积的增大而线性增大,最大值相对于最小值增加了55.3%;壁面平均冷却效果随着引气孔面积的增大而增大,最大值与最小值偏差337.7%;壁面最高温度随引气孔面积增大下降幅度较小,最大值与最小值偏差仅为2%;局部总压恢复系数随引气孔面积的增大而下降,下降幅度为5.1%。

A new method for film cooling of support plate with cavity in integrated afterburners was put forward to organizing combustion better in the integrated afterburner. With variation of cooling air vent area, its conjugate heat transfer numerical simulation study was conducted on the cruise flying state. The influence of different cooling air vent area on the cooling air flow rate distribution, the average cooling effectiveness, the wall temperature and par-tially total pressure recovery coefficient was acquired. The results shows that ： According to the parameters in the study, the intercepted cooling air mass flow rate increases linearly with air vent area and the maximum value is high-er 55. 3% than the minimum;The average cooling effectiveness of support plate wall temperature increases linearly and deviation of the minimum and maximum value is 337. 7% ;The maximum wall temperature changes weakly with the increase of cooling air vent area and deviation of the minimum and maximum value is only 2% ,and the reason is that the cool air can not cool air upstream region where the high temperature area locates; Partially total pressure recovery coefficient decreases with the increasing air vent area,which reduces 5. 1%.