带除湿槽涡轮叶栅非平衡凝结流动数值研究  

Non-Equilibrium Condensation Flow in Steam Turbine With Dehumidification Structure

作　　者：鞠凤鸣[1] 颜培刚[1] 陈晓娜[1] 韩万金[1] 

机构地区：[1]哈尔滨工业大学能源科学与工程学院,黑龙江哈尔滨150001

出　　处：《工程热物理学报》2013年第5期841-844,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金委创新研究群体(No;51121004)

摘　　要：基于存在自发凝结的湿蒸汽两相流动,开发了基于汽液两相双流体模型和k-ε-k_p湍流模型的计算方法,并对喷管和二维叶栅进行数值验证,结果表明本文所开发的方法具有较高的可靠性。对某汽轮机末级除湿静叶考虑除湿槽结构的二维流场进行了数值研究,指出在叶片表面开设除湿槽结构,能够显著影响涡轮叶栅内的非平衡凝结流动。由于除湿槽对水滴的抽吸作用使得叶栅内成核率峰值降低,且变化幅度减小,因此成核过程更为稳定。除湿槽结构使得叶栅内部大水滴数目减少,尾迹区水滴平均半径减小,叶栅出口湿度下降。The numerical method which applied for modelling the spontaneous condensation of wet steam two-phase flow based on the two-fluid model and the calculation method of k-ε-k_pturbulence model has been developed. The numerical validation was implemented in nozzle and two dimensional cascade, which shows that the method is highly reliable. The two-dimension flow field analysis for a steam turbine final dehumidification stator blade was investigated numerically, the result shows that the non-equilibrium condensation flow in the turbine can be effected significantly by the moisture removal slot on the surface of a steam turbine. Because of the suction effect of dehumidification slot, the peak and change amplitude of blade nucleation rate was reduced, which resulted in a more stable nucleation process .In addition, the structure of moisture removal slot could cause a declination of the number of water droplets, the average radius of droplet in trailing area and the outlet wetness fraction of cascade.

关 键 词：涡轮叶栅 湿蒸汽 自发凝结 两相流动 除湿 

分 类 号：TK123[动力工程及工程热物理—工程热物理]