燃气涡轮静叶考虑叶型及冷却结构的气热耦合优化

Conjugate Heat Transfer Optimization for Blade Profiles and Cooling Structure in Turbine Vane

为通过气热耦合优化计算改善叶片表面温度场,提高叶片气动效率,编制了气热耦合气动和冷却结构参数化方法程序及网格自动生成程序,采用该程序对燃气涡轮静叶进行了考虑叶型及冷却结构的气热耦合优化。优化结果表明:对叶型及冷却结构优化后,形成解集中气动效率分别提升0.3%和0.17%,主流流量仅变化0.116%和0.058%,高温函数降低38.55%、51.6%,叶片表面最大温度降低5.6 K、6.9 K,平均温度降低5 K、7 K。通过分析,前缘第一腔高温区雷诺数的增大以及第三腔低速回流区的减小是改善叶片温度场的主要因素;根中截面的型面压差的减小导致横向二次流损失的降低是减小气动损失的主要原因。

To ameliorate the temperature distribution and improve its aerodynamic performance of vane by conjugate heat transfer optimization,the in house-code of parametric method and grid generation for aero-thermal conjugating has programed.The study of using this in house-code to optimize the turbine vane considering blade profile and cooling structure has done.The results shows that by conjugate heat transfer optimized on cooling structure and profile,the aerodynamic has increased 0.3%and 0.17%,the flow rate of main flow has changed only 0.116%and 0.058%,the high temperature function has decreased 38.55%and 51.6%,while the maximum temperature of blade surface has reduced 5.6 K and 6.9 K,average temperature has lessened 5 K and 7 K.The increase of Re in high temperature of first chamber and low speed vortex region in the third cavity are the main factors of temperature distribution improvement,while the decrease of low transverse secondary flow loss led by reduce of pressure difference between pressure surface and suction surface is the main factor of the reduce of the aerodynamic loss.