摘要
针对全转速汽轮机1 500 mm长末级动叶片顶部专用超音速叶型的激波结构和变工况气动性能开展研究。采用数值模拟方法分析了进口马赫数为0.9~1.3、出口等熵马赫数为1.42~2.48时的超音速流场特性。结果表明:激波结构主要由前缘波及其两次反射波、尾缘波及其一次反射波组成;叶型损失随出口等熵马赫数的增加而下降,进口马赫数为0.9时出口等熵马赫数从1.42增加到2.48时的能量损失系数降低0.016(降低比例42%),进口马赫数为1.3时降低值达0.097(降低比例66%);叶型损失随进口马赫数的减小而降低,出口等熵马赫数为1.42时,进口马赫数从1.3降低到0.9的能量损失系数降低0.097(降低比例74%),而在出口等熵马赫数为2.48时,仅降低0.028(降低比例58%),造成这种变化的原因与尾迹区和激波强度的变化密切相关。
The shock wave structure and off-design aerodynamic performance of the special supersonic blade profile at the top of the 1500 mm moving blade for ultra-long last-stage of full-speed steam turbine were studied in this paper.By using the numerical simulation method,the characteristics of supersonic flow fields within the range of inlet Mach number from O.9 to 1.3 and outlet isentropic Mach number from 1.42 to 2.48 were analyzed.The results show that the shock wave structure of the blade profile is mainly composed of the leading-edge wave and its two reflected waves,as well as the trailing-edge wave and its one reflected wave.The blade profile loss decreases with the increase of the outlet isentropic Mach number.At the inlet Mach number of 0.9,the energy loss coefficient reduces by O.O16 with reduction proportion of 42%as the outlet isentropic Mach number increases from 1.42 to 2.48.At the inlet Mach number of 1.3,the reduction value reaches 0.097 with reduction proportion of 66%.The blade profile loss decreases with the reduction of the inlet Mach number.When the outlet isentropic Mach number is 1.42,the energy loss coefficient reduces by 0.097 with reduction proportion of 74%as the inlet Mach number reduces from 1.3 to 0.9,while when the outlet isentropic Mach number is 2.48,it only decreases by 0.028 with reduction proportion of 58%.The reasons for these changes are closely related to the changes in the wake region and the intensity of the shock waves.
作者
刘云锋
周逊
张宏涛
温风波
李宇峰
LIU Yunfeng;ZHOU Xun;ZHANG Hongtao;WEN Fengbo;LI Yufeng(School of Energy Science and Engineering,Harbin Institute of Technology,Harbin,China,150001;Harbin Turbine Company Limited,Harbin,China,150046)
出处
《热能动力工程》
北大核心
2025年第9期48-54,共7页
Journal of Engineering for Thermal Energy and Power
关键词
汽轮机长叶片
超音速叶型
变工况
气动性能
steam turbine long blade
supersonic profile
off-design condition
aerodynamic performance
