过膨胀超音速蒸汽射流的一种流形及其换热研究  

RESEARCH ON FLOW AND HEAT TRANSFER CHARACTERISTIC OF OVER-EXPANDED SUPERSONIC STEAM JET IN WATER

作　　者：武心壮[1] 严俊杰[1] 潘冬冬[1] 刘光耀[1] 李文军[1] 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,陕西西安710049

出　　处：《工程热物理学报》2010年第12期2031-2034,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50676078;No.50821064);国家重点基础研究计划项目(973)(No.2009CB219803)

摘　　要：针对进口压力0.4 MPa和0.5 MPa的过膨胀超音速蒸汽在20～50℃过冷水中浸没射流凝结形成的收缩-膨胀-收缩形汽羽的几何参数和换热特性进行了实验研究,并且给出了与汽羽形状对应的典型的射流温度场。建立了收缩-膨胀-收缩形汽羽的分析模型,给出了汽羽的收缩比和无量纲穿透长度。同时,根据平均凝结换热系数的实验关联式,得到射流凝结换热系数在0.71～1.16 MW/(m^2·℃)之间;通过简化得到汽羽表面积的计算公式,根据对流换热模型,得到的平均凝结换热系数在0.71～1.03 MW/(m^2·℃)之间,与实验关联式得到的结果基本一致。t An experiment, with the steam pressure 0.4 and 0.5MPa, and the water temperature 20-50℃, was designed to investigate the steam plume shape, condensation heat transfer characteristic and temperature fields of an over-expanded supersonic steam jet in subcooled water. An analysis model was given to describe the steam plume shape, contraction ratio and dimensionless penetration length. Moreover, the average condensation heat transfer coefficient was obtained in the range of 0.71-1.16 MW/（m2. ℃） by the correlation. According to the heat convection model and k simplified area expression of the steam plume, the average condensation heat transfer coefficient was obtained in the range of 0.71-1.03 MW/（m2.℃）. The results indicated that the similar average heat transfer coefficients could be obtained by the two different methods.

关 键 词：过膨胀超音速 蒸汽射流 汽羽形状 换热系数 

分 类 号：TK2[动力工程及工程热物理—动力机械及工程]