涡轮叶片有侧流扰流柱通道流动的实验研究

Experimental Investigation on Flow in Pin-fin Trapezoidal Duct

对有侧流梯形扰流柱通道端壁的静压分布和压力系数进行了实验测量。研究了不同的雷诺数和侧向出流比的情况下,各种因素对压力系数的影响。结果显示:①侧向出流比(C)小于1时,端壁表面静压沿径向变化较小,在实验段入口和出口处较大,在中间段略低;在弦向方向上,静压变化相对较为剧烈,从通道左边到右边的弦向出口,静压分布趋势是递减的,在通道扰流柱左边压力变化梯度较小,通道右边弦向出口附近压力变化梯度较大;②C为1时,端壁静压的变化主要集中在弦向方向上,变化趋势与结论1一致;③压力系数随雷诺数的增加而降低,但是变化幅度相对较小;压力系数随着侧向出流比变化相对较大,压力系数随着侧向出流比的增大而减小。

Experiments are conducted to determine the distribution of static pressure and pressure coefficient in a pin - fin trapezoidal duct that models the cooling passages in gas turbine blades. The result reveals ： （ 1 ） When the lateral off- take ration （C） is less than 1, i.e. （ C 〈 1 ）, the radial variation of the static pressure is not remarkable. At the entrance and exit of test segment, the static pressure is higher than that in the middle of test segment; the chordwise variation of the static pressure is intense. The changing grade of the static pressure is much larger at the chordwise exit than that at the left of the pin - fin. （2） C = 1, the variation of the static pressure of the end wall mainly concentrates on the along ehordwise direction. The trend is the same as conclusion one. （3） The lateral off -take ratio＇s effect on pressure coefficient is much higher than the Re number＇s. The pressure coefficient is decreased with the increase of C.