采用热—流耦合方法对内冷式涡轮叶片换热的计算研究

【作者】 张丽芬；

【导师】 吴丁毅；

【作者基本信息】 西北工业大学 ， 航空宇航推进理论与工程， 2006， 硕士

【摘要】 论文对带有内冷通道的涡轮叶片的换热问题进行了计算研究。通过对外流场、叶片和内冷通道流场建立计算模型、进行耦合求解,得到了涡轮叶片温度场分布。在计算过程中叶片表面的热边界条件无法预先给出,需要由热量交换过程动态地加以决定,针对这一问题,本文采用了热-流耦合方法加以解决。 作为验证,采用热-流耦合方法计算了两个算例。第一个是流体绕流前缘为钝形二维平板的换热,并与分析解进行比较,计算结果和分析解吻合很好;第二个,对于带有内冷通道的C3X、MarkⅡ涡轮叶片进行了计算,与实验结果进行了对比,计算结果与实验值吻合良好。 上面的验证说明了热-流耦合方法的可靠性,在此基础上,本文采用热-流耦合方法对某叶片进行了三维计算。分别计算了实心叶片(无冷却)、带有八个径向内冷通道、带有径向冷却腔三种冷却形式,并且在计算中考虑了辐射的影响。 通过以上的计算说明热-流耦合方法求解涡轮叶片的耦合换热问题是可行的和有效的,为工程应用提供了有价值的参考。更多还原

【Abstract】 The heat transfer of turbine blade with inner cooling was numerical studied. The calculation model of exterior flow, blade structure and cooling flow were established and the temperature fields of balde were obtained. Actually, the condition on the interface between flow field and structure was unknown, it should be determined by the dynamic process of heat transfer. Against above problem, heat-flow coupling method was presented and adopted in this paper.Two cases were simulated to validate the heat-flow coupling method. The first one was a 2-D laminar flow around a flat plate with blunt leading edge, the numerical calculation and the analytic results agreed well. The second case were two kinds of blade, C3X and MarkII, both with radial cooling tubes, the prediction showed well compared with experimental data.Based on the above validation, some blade was computed for three different cooling solutions: solid blade(no cooling), blade with eight cooling tubes, blade with cooling cavity, by heat-flow coupling method. Radiation was taken into account.The study showed that solving the heat transfer problem of turbine blade by heat-flow coupling method was feasible and effective. The paper provided valuable references for engineering application.更多还原