带肋壁与出流孔内流通道的流阻特性

Pressure loss of the internal passage with rib turbulators and suction holes

关键词:  涡轮叶片  冷却  内流通道+  肋  出流孔+  流阻

Key words:  Turbine blade  Cooling  Internal passage~+  Rib  Suction hole~+  Flow resistance

摘要:

采用根据相似理论几何放大的模型,在流动相似的条件下,实验研究了带肋壁与出流孔内流通道的流阻特性。在内流通道进口雷诺数为40000～80000,通道总出流比为0 30～0 60的范围内测量了通道压力损失系数Cp的分布,分析了通道进口雷诺数和通道总出流比对Cp的影响规律。结果显示:在通道进口雷诺数一定时,随总出流比的提高,通道内Cp减小,压力损失减小;在通道总出流比一定时,通道进口雷诺数对Cp无显著影响。另外,在比较了当前内流通道流阻工程算法与实验结果的基础上,提出了对当前流阻算法的改进措施。

Abstract:

Experimental investigations of pressure loss of the internal passage with rib turbulators and suction holes were carried out on proportionally enlarged model. The distributions of pressure drop coefficients were measured along the passage with Reynolds numbers changing from 40000 to 80000 and suction ratios (SR) changing from 0.30 to 0.60. Influences of Reynolds number and suction ratio on pressure loss were studied. Results indicate that pressure drop coefficients decrease as the suction ratio increases while the changing of Reynolds number contributes no remarkable effect on altering the value of pressure drop coefficients. In addition, a method to predict the pressure loss in the passage is provided.