论文部分内容阅读
针对存在动叶顶部间隙泄漏流的一级半透平级非定常流场,应用全三维黏性非定常数值模拟方法详细研究了动叶顶部间隙泄漏流气动特性,旨在揭示泄漏流与下游静叶栅的非定常干涉作用.结果表明:动叶顶部间隙泄漏流引发第二列静叶前缘85%叶展位置处静压波动;受相邻叶排间势干涉作用,第二列静叶50%叶展位置处的静压波动集中于流道中部;在第二列静叶出口截面,动叶顶部泄漏流引发的泄漏涡,其强度及空间分布并未随时间发生明显变化;汽封内的泄漏流静压随时间周期性波动,压力值的更新首先出现于下游并朝向上游流发展.
Aiming at the first-order semi-turbulent unsteady flow field with the leakage flow at the tip of the moving blade, the aerodynamic characteristics of the leakage flow at the top of the moving blade are studied in detail by using the unsteady numerical simulation of full three-dimensional viscous flow. The results show that the leakage flow at the top of the rotor blade induces the hydrostatic pressure fluctuation at 85% of the leading edge of the second stator vane, and the second stator vane The static pressure fluctuation at 50% of the leaf spreading position is concentrated in the middle of the flow channel. The strength and spatial distribution of the leakage vortex caused by the leakage flow at the top of the vane did not change obviously with time in the outlet section of the second vane. Static pressure within the leakage flow periodically fluctuates with time, and the update of the pressure value first appears downstream and toward the upstream flow.