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在燃气轮机的设计研究中,用于冷却静叶端壁的气体会有一部分从端壁的侧面沿轴向流出,这部分气体恰恰处在轮缘间隙密封流体和主流的交互作用区。采用数值模拟的方法研究了真实工况下端壁侧向出流与动静叶间隙密封流的相互影响,分析了其作用机理并在此基础上提出了一种新型的非均匀布置出流孔结构。结果表明端壁侧向出流能够抑制主流侵入涡系的大小和深度,当端壁侧向出流量Rm=10%能够将密封间隙冷却60~80K;新提出的非均匀布置端壁侧向出流孔结构能改善对静叶尾缘附近这些燃气入侵严重区域的密封效果,Rm=10%的情况下非均匀出流形式在静叶尾缘区域的密封效率能够提高3%左右。
In the design of gas turbines, some of the gas used to cool the tip of the stator tip will flow axially from the side of the endwall, just where the gap between the rim seal fluid and the main flow interacts. The interaction between the lateral outflow in the end wall and the seal flow between the moving and stationary vanes under real working conditions was studied by numerical simulation. The mechanism of action was analyzed and a new kind of outflow hole structure with nonuniform distribution was proposed. The results show that the outflow at the end wall can restrain the size and depth of the main flow entering the vortex system. When the lateral outlet flow rate of the end wall Rm = 10%, the seal gap can be cooled by 60 ~ 80K. The orifice structure can improve the sealing effect on these serious gas invaded areas near the trailing edge of the stator vane. The non-uniform outflow form can increase the sealing efficiency by about 3% at the trailing edge of the stator blade with Rm = 10%.