核电汽轮机中的湿蒸汽流动研究  

Study on Wet Steam Flow in a Nuclear Turbine

作　　者：吴晓明 杨建道 李亮[2] 

机构地区：[1]上海汽轮机厂有限公司,上海200240 [2]西安交通大学能源与动力工程学院叶轮机械研究所,西安710049

出　　处：《热力透平》2015年第4期233-238,共6页Thermal Turbine

摘　　要：对某核电汽轮机低压缸通流部分作三维数值模拟,分析湿蒸汽流动的特点及其影响,在此基础上结合湿汽损失的形成机理,对其各组成部分分别进行模化和估算,结果表明湿蒸汽级内湿汽损失的大小及分布与传统的Baumann准则存在较大差异,后者可能低估了由非平衡凝结引起的热力学损失;通过计算水滴运动轨迹研究末级空心静叶表面的水分沉积,分析去湿槽抽吸水膜的性能及其影响因素,相应的试验研究则表明抽吸性能受到当地汽流马赫数、抽吸压差以及缝隙宽度等因素的综合作用,此外水膜从叶片表面转向进入去湿槽时的汽化对抽吸性能有较大的负面影响,因此去湿槽的设计主要取决于其上游的水膜流动状况。Three-dimensional numerical simulations on the flow path of LP cylinder in a nuclear steam turbine were carried out, and the characteristics of wet steam flow and their effects were analyzed. According to the formation mechanism, each component of wet loss was modeled and estimated respectively. Compared with the traditional Baumann rule, it indicates that there are great differences in the value and distribution of wet loss. The water deposition on the hollow stationary blade of the last stage was investigated by calculating the water droplets trajectories, and the extraction performance of the suction slots and its affecting factors were analyzed. The corresponding experimental studies indicate that the extraction performance is influenced by the combination effects of the local Mach number, the pressure difference of suction and the slot width, etc. In addition, there was a great negative impact of vaporization on the extraction performance when the water film turned into the slots from the blade surface. Therefore, the suction slot design mainly depends on the upstream water film flow.

关 键 词：核电汽轮机 湿蒸汽流动 数值模拟 空心静叶 试验研究 

分 类 号：TK261[动力工程及工程热物理—动力机械及工程]