涡轮冷却空气增压装置的数值研究

Numerical Investigation on Cooling Air Supercharging Device of Turbine

为研究预旋喷嘴与旋转涡轮盘之间的匹配关系,对涡轮冷却空气增压装置进行研究,分析了冷气预旋对冷却性能的影响。得出以下结论:采用预旋喷嘴后,能够有效降低冷气的出口静温,改善冷气的冷却能力;随着冷气预旋角度的增大,预旋域的冷气出口温度不断降低,预旋角度超出65°后,冷气温度略微升高,但仍低于未预旋方案的冷气出口温度;预旋会使得旋转域的流阻损失增大,但能够降低静止域二次流,从而减小静止域流阻损失,减小的静止域流阻损失是降低预旋冷气出口温度的因素之一。

To study the matching relationship between swirl nozzles and rotating turbine disk, the research on turbine cooling air supercharging device has been carried out. The influence on the cooling perform- ance by swirled cooling air has been analysed. The result shows that the static temperature of outlet cool- ing air is decreasing by using swirl nozzles, which will help to improve the cooling capacity of cooling air. With the increase of angle of swirled cooling air, the outlet temperature of nozzles decreased. The cooling air temperature slightly increased while the angle is beyond 65 o, which is still less than the cooling air temperature with no swirl. The swirled plan will increase the flow resistance of rotating domain. However it can reduce the secondary flow of static domain and the flow resistance of static domain. The reduction of this flow resistance is one factor of decreasing outlet temperature of swirled cooling air.