接收孔周向倾角对预旋转静盘腔流动特性的影响

Influence of the Circumferential Inclination of Receiver Holes on the Flow Characteristics of the Pre-Swirl Rotor-Stator Cavity

针对燃机透平叶片供气系统中的预旋转静盘腔,为了研究预旋转静盘腔的流动特性,建立了预旋转静盘腔计算模型,在3种预旋比(βp=0.48,0.94,1.41)和3种喷嘴径向位置(r p/r b=0.8,0.9,1.0)下,数值研究了6种接收孔周向倾角(α=70°,90°,100°,110°,120°,135°)对预旋转静盘腔流动特性的影响,分析了接收孔周向倾角对流场分布及绝热预旋效率和对接收孔流量系数的影响规律。研究结果表明:当r p/r b=0.8时,接收孔周向倾角越大,接收孔流量系数值就越大,而且大预旋比下的增强效果显著,但对绝热预旋效率的影响很小,预旋比一定时,每种喷嘴径向位置下均存在最优接收孔周向倾角,此时的绝热预旋效率和接收孔流量系数值达到最大,冷气流过接收孔时的流动损失达到最小,温降值达到最大。

The pre-swirl rotor-stator cavity is an important flow unit in the gas turbine blade air supply system.In order to study the flow characteristics of the gas turbine pre-swirl rotor-stator cavity,a pre-swirl rotor-stator cavity calculation model was established.Using three kinds of pre-swirl ratios(βp=0.48,0.94 and 1.41),three nozzle radial positions(r p/r b=0.8,0.9 and 1.0),and six kinds of circumferential inclination angles of receiver hole(α=70°,90°,100°,110°,120°and 135°),the he influences of the circumferential inclination angle of the receiver hole on the flow field distribution and the adiabatic pre-swirl efficiency as well as the discharge coefficient of the receiver hole were analyzed.The results show that when the radial position of the nozzle r p/r b was 0.8,the larger the circumferential inclination angle of the receiver hole was,the larger the discharge coefficient of the receiver hole would be,and the effect was more obvious under large pre-swirl ratio,but the effect on the adiabatic pre-swirl efficiency was small.When the pre-swirl ratio was constant,there was an optimal receiver hole circumferential inclination at the radial position of each nozzle,so that the adiabatic pre-swirl efficiency and the discharge coefficient of the receiver hole were maximized.When the cold air flowed through the receiver hole,the flow loss was minimized and the temperature drop reached its maximum.