汽轮机高压反动级叶栅内流动损失的数值分析  

Numerical Analysis of Flow Loss in Steam Turbine High Pressure Reaction Stage

作　　者：曹丽华[1] 孙毅[1] 李勇[1] 

机构地区：[1]东北电力大学能源与动力工程学院

出　　处：《化工机械》2011年第4期440-444,共5页Chemical Engineering & Machinery

摘　　要：采用FLUENT软件对某300MW汽轮机高压反动级叶栅的内部流动损失进行数值分析。结果表明,随着级进汽流量的减少,同一通流部分截面内的熵函数值呈逐渐上升趋势;叶栅压力横向梯度加剧,导致端壁二次涡区影响范围增大,损失逐渐增大;动叶尾部流场紊乱程度增大,湍流动能增大;压力系数沿流动方向逐渐增大,高损失区首先在前缘部分产生。The flow loss in high pressure reaction stage of a 300MW steam turbine was analyzed with FLUENT software. The results show that the entropy value in the same steam path section increases gradually along with the flow rate decreased; and the blade transverse pressure gradient increased influences the second vortex area in the end wall and can increase the flow loss ; the increase of the disorder degree of blade wake flow field can result in that of the turbulent kinetic energy; the pressure coefficient can gradually increase along flow direction and the high loss area occurs first in blade leading edge.

关 键 词：汽轮机 反动级 叶型损失 二次流损失 

分 类 号：TQ051.21[化学工程]