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针对某型燃气轮机运行时回流式环管型燃烧室的火焰筒常发生烧蚀和裂纹,需获取其火焰筒壁温分布特点,进行分析以提出改进措施.全面考虑固体导热和辐射传热、气体与固体间的对流换热以及火焰和燃气的辐射,对燃烧室进行三维气热耦合数值模拟计算,获取流场、温度场以及壁温分布信息,并结合实验验证了三维气热耦合数值模拟能够较有效预测火焰筒壁温分布.由模拟结果知该型火焰筒壁温未超过设计值1 223K,但在联焰管与筒体连接处以及多个主燃孔处的温度较高、温度梯度较大,需要对这些部位的冷却方案进行改进.
Aiming at the ablation and cracking of the flame tube of the recirculation type tubular combustion chamber during operation of a gas turbine, the temperature distribution of the flame tube wall needs to be obtained and analyzed to propose the improvement measures. Considering the solid thermal conductivity and radiation heat transfer, And convection heat transfer between solids and flame and gas radiation, the three-dimensional aerodynamic coupling numerical simulation of the combustion chamber to obtain the flow field, temperature field and wall temperature distribution information, and verified by experiments that the numerical simulation of three-dimensional gas-heat coupling The temperature distribution of the flame tube wall is more effectively predicted.The simulation results show that the wall temperature of the flame tube does not exceed the design value of 1 223K but the temperature at the joint of the flame tube and the tube body and at the multiple primary burners is higher, Larger, you need to improve the cooling scheme for these parts.