1000MW汽轮机低压末级二次水滴沉积特性分析  

Analysis of the Secondary Water Droplet Deposition Characteristics in the LP Last Stage of a 1000 MW Steam Turbine

作　　者：王纯[1] 谢诞梅[1] 李曦滨[2] 范小平[2] YU Xing-gang YIN Ming-yan 

机构地区：[1]武汉大学动力与机械学院,湖北武汉430072 [2]东方汽轮机有限公司,四川德阳618000

出　　处：《热能动力工程》2015年第5期720-724,822-823,共5页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金资助项目(51376140)

摘　　要：采用ANSYS CFX软件对某1 000 MW火电汽轮机低压末两级内部流场进行了数值计算,确定了末级进口处一次水滴的径向分布;通过二次水滴份额预测并对其径向分布进行合理修正,得到了较高精度的二次水滴末级进口边界条件并计算得到二次水滴在末级静叶表面的沉积分布情况。结果表明:末级静叶栅进口处二次水滴的份额为10%,主要分布在进口相对叶高60%以上;末级静叶片表面二次水滴沉积率为77.8%,其中,压力面占总沉积量的60.9%;在径向上,二次水滴主要沉积在30%叶高以上;在轴向上,二次水滴主要沉积在压力面80%叶宽之后和吸力面40%叶宽之前。Numerically calculated was the flow field inside the last two stages of a 1 000 MW thermal power generation purposed steam turbine by using the software ANSYS CFX and determined was the distribution of the primary water droplets at the inlet of the last stage along the radial direction. By making use of the secondary water droplet proportion,the primary water droplet proportion was predicted and its distribution along the radial direction was also reasonably corrected,thus obtaining the boundary conditions of the secondary water droplets at the inlet of the last stage with a relatively high precision. Finally,the distribution of the water droplets deposited on the surface of the stator blades of the last stage was calculated. It has been found that the proportion of the secondary water droplets at the inlet of the stator blade cascade of the last stage is 10% and mainly distributed at the relative blade height of above60% and the secondary water droplet deposition rate on the stator blade surface of the last stage is 77. 8%,among which that on the pressure surface accounts for 60. 9% of the total deposition amount,along the radial direction,the secondary water droplets mainly deposit at the relative blade height of above 30% while along the axial direction,they mainly stand on the pressure surface after the blade width of 80% and on the suction surface before the blade width of 40%.

关 键 词：汽轮机 末级静叶 二次水滴 沉积分布 

分 类 号：TK263.3[动力工程及工程热物理—动力机械及工程]