低雷诺数环境中低压涡轮部件的气动设计探索

Investigation of aerodynamic design of low pressure turbine at low reynolds number conditions

为了探索高空低雷诺数情况下高性能低压涡轮部件的气动设计思路和设计方法,通过采用高负荷、大弦长的叶片设计和选择恰当的叶片表面速度分布形式设计了一台新低压涡轮。三维粘性数值模拟的结果显示新低压涡轮效率在高空低雷诺数情况下比设计点下降2 3个百分点。设计结果表明提高涡轮工作雷诺数和降低涡轮性能对雷诺数变化的敏感程度是低雷诺数环境下高性能涡轮气动设计的关键。

To investigate the aerodynamic design ideas and concrete methods of high performance Low Pressure Turbine (LPT) at low Reynolds number condition, a new LPT of high load, large chord and proper velocity distribution was designed. The results of 3D viscous numerical simulation show that the efficiency of new LPT decreases 2.3 percent under the low Reynolds number condition, compared with that of design point. The results show that increase of flow Reynolds number and decrease of sensitivity of turbine performance to Reynolds number are two key technologies to aerodynamic design of high performance LPT.