汽轮机空心静叶去湿缝隙结构的研究  

A Study of the Moisture-removal Slot Structure in the Hollow Stationary Blades of a Steam Turbine

作　　者：王新军[1] 高铁瑜[1] 徐廷相[1] 

机构地区：[1]西安交通大学叶轮机械研究所动力工程多相流国家重点实验室,陕西西安710049

出　　处：《热能动力工程》2005年第1期14-17,共4页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学重点基金资助项目 ( 5 0 3 3 60 5 0 ) ;国家自然科学专项基金资助项目 ( 5 0 3 2 3 0 0 1)

摘　　要：在空气 -水膜两相流动试验装置上 ,试验研究了去湿缝隙几何形状和尺寸与缝隙去水效率之间的关系 ,得到了缝隙角度、宽度与去水效率的关系曲线 ;分析了空心静叶去湿缝隙的抽吸过程和机理 ;讨论了缝隙抽吸对叶栅通道内主流场的影响。结果表明 :小的缝隙角度可以提高缝隙的去水效率 ;存在一个去水效率较低的缝隙宽度范围 ,在本试验条件下 ,相应去水效率较低的缝隙宽度为 1.0～ 1.5mm ;另外 ,将缝隙进口前端边缘加工成带有半径为 1mm的过渡圆角 ,可以将缝隙去水效率提高 5 %以上。在此基础上 ,提出了空心静叶去湿缝隙的基本设计原则以及合理的缝隙结构形状与尺寸。On a test rig of air and water-film two-phase flows an experimental research was conducted of the relationship between the geometric shapes and dimensions of a moisture removal slot on the one hand and the moisture removal efficiency of the slot on the other. As a result, obtained were the correlation curves of slot angles, widths and moisture removal efficiency. An analysis was performed of the suction process and mechanism of the moisture removal slot in a hollow stationary blade and the impact of the slot suction on the main flow field in a cascade passage discussed. The results of the analysis show that a small slot angle can enhance the moisture removal efficiency of the slot and there exists a range of slot widths, which contribute to a relatively low efficiency of moisture removal. Under the present test conditions the slot width associated with a relatively low efficiency of moisture removal is found to be 1.0 - 1.5 mm. Moreover, when the front-end edge of the slot inlet is machined to form a transition round angle with a 1 mm radius, it is possible to enhance the moisture removal efficiency of the slot by more than 5%. On this basis proposed are the basic design principle of a moisture removal slot and rational slot structure shape and dimensions for the hollow stationary blades.

关 键 词：汽轮机 空心静叶 去湿缝隙 结构设计 

分 类 号：TK261[动力工程及工程热物理—动力机械及工程]