【摘要】 为评估湿空气透平循环中湿燃气对透平叶片燃气侧换热特性的影响,以及湿空气对透平叶片冷却效果的影响,以C3X叶片为例,采用热流固耦合的数值计算方法,研究了湿燃气含湿量对透平叶片表面温度和传热系数的影响,对比分析了干空气与湿空气冷却效果的差异。同时在研究范围内给出了透平叶片燃气侧传热系数的无量纲关系式,为湿化燃气轮机透平叶片的优化和冷却结构设计提供参考。结果表明:湿燃气含湿量对透平叶片燃气侧的流动性能基本无影响;当湿燃气含湿量从0 g/kg增加到150 g/kg,主流进口温度为1 473 K时,透平叶片表面平均传热系数增加10%,且增加幅度随着主流进口温度的升高而增大,叶片表面最高温度平均提高10 K;与干空气相比,湿空气作为冷却工质时的叶片表面温度更低,冷却效率更高,且冷却效率随着湿空气含湿量的增加而提高。更多还原

【Abstract】 Taking a C3 X blade as an example, a thermo-fluid-solid coupling simulation was carried out to evaluate the moist gas heat transfer performance and the moist air cooling effect upon turbine blades. The influence of the moist gas humidity ratio on turbine blade surface temperature and heat transfer coefficient were investigated, and cooling performances between the dry air and the moist air were compared and analyzed. Heat transfer coefficient dimensionless relation of turbine blade was given, which provide reference for optimization of humidified turbine and design of cooling structure. Results show that the moist gas humidity ratio has no distinct influence on flow characteristics of turbine blade. When the humidity ratio increases from 0 g/kg to 150 g/kg, heat transfer coefficient of turbine blade surface increase by 10% at inlet temperature of 1 473 K and the increments are enlarged with the rise of inlet temperature. Besides, the turbine blade wall temperature increases by 10 K. Compared with dry air, it can be achieved lower blade wall temperature and higher cooling efficiency while using moist air as the cooling medium, and the moist air cooling efficiency increases with the rise of moist air humid ratio.更多还原