外界核心对喷管内水蒸气凝结流动的影响  

INFLUENCES OF EXOTERIC NUCLEI ON VAPOR CONDENSATION FLOWS IN NOZZLE

作　　者：蒋文明[1] 刘中良[1] 刘晓丽 邓展飞 李志彪[3] 鲍玲玲[1] 

机构地区：[1]北京工业大学环境与能源工程学院教育部传热强化与过程节能重点实验室,北京100124 [2]西安长庆科技工程有限责任公司,陕西西安710021 [3]中国石油天然气股份有限公司规划总院,北京100083

出　　处：《工程热物理学报》2010年第12期2121-2124,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50676002);教育部高等学校博士学科点专项科研基金项目(No.20040005008);北京市拔尖创新人才选拔计划项目(2006)资助;北京工业大学第一届博士研究生创新计划资助项目(No.bcx-2009-043)

摘　　要：建立了考虑摩擦阻力的一维水蒸气超音速流凝结数学模型,对喷管内含有不同初始浓度和半径的外界核心的水蒸气超音速流凝结过程进行了数值计算。结果发现:当外界核心浓度在不同范围内时,外界核心半径对凝结有不同的影响规律;当外界核心半径在不同范围内时,外界核心浓度对凝结也有不同的影响规律;为了促进凝结的发生,要选择匹配的外界核心平均半径和浓度。选定喷管出口的液相质量分数为标准,针对计算的几种情况得出:当外界核心半径为1.0×10^(-9)m,外界核心浓度为1.0×10^(14)kg^(-1)时,对应的喷管出口处的液相质量分数最大。A mathematical model was developed to investigate the water vapor condensation under supersonic flow conditions. A numerical simulation was performed for the water vapor in nozzle with the model with various initial concentration and sizes of exoteric nuclei. It was found that the influences of the radius of on the condensation are different for different concentration of the exoteric nuclei and the effects of the concentration of the exoteric nuclei on the condensation are different for the exoterie nuclei of different radius. Therefore it is of basic importance to introduce external particles of proper sizes and condensation in order to enhance the condensation of steam in nozzle. It was found that the liquid mass fraction at outlet of nozzle is maximal when the particle radius is1.0×10^-9m the particle concentration is 1.0×10^14/kg for the Laval nozzle and the condition studied.

关 键 词：外界核心 水蒸气 非均质凝结 喷管 

分 类 号：TK123[动力工程及工程热物理—工程热物理]