管内蒸汽冷凝过程关键热力学参数分布特征  

Distribution Characteristics of Key Thermodynamic Parameters of Vapor Condensation Inside Tubes

作　　者：王昱乾 王卫良 曹夏昕[1] WANG Yuqian;WANG Weiliang;CAO Xiaxin(Heilongjiang Provincial Key Laboratory of Nuclear Power System&Equipment(Harbin Engineering University),Harbin 150000,Heilongjiang Province,China;Energy and Electricity Research Center(International School of Energy,Jinan University),Zhuhai 519000,Guangdong Province,China)

机构地区：[1]黑龙江省核动力装置性能与设备重点实验室(哈尔滨工程大学),黑龙江省哈尔滨市150000 [2]能源电力研究中心(暨南大学国际能源学院),广东省珠海市519000

出　　处：《中国电机工程学报》2025年第6期2274-2284,I0020,共12页PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING

基　　金：珠海市产学研合作项目(2220004003010);华能集团总部科技项目“基础能源科技研究专项(三)”(HNKJ22-H105)。

摘　　要：受限于管道尺寸、液膜易受损以及测点大小等多方面因素,当前管内冷凝实验研究可获取数据的密度较低,周向测点数不足以支撑周向分布特征的建立。为此,该文在周向和轴向2个方向上完成凝结液流动及冷凝相变的控制方程组的推导,利用编程建立管内蒸汽冷凝现象关键热力学参数多维分布特征的数学求解模型,并通过与实验数据和经验公式的对比验证模型的可靠性。基于计算结果完善冷凝过程中关键热力学参数的多维分布特性,分析倾斜角度和相间剪切力等因素对管内蒸汽冷凝过程计算的影响。结果表明:对于非竖直状态下圆管内蒸汽凝结换热而言,液膜区域的蒸汽凝结量在总凝结量中的占比始终保持在99%以上,因此在计算中可以忽略液池区域的蒸汽凝结;对于倾斜角度小于等于15°的工况,液池区域的凝结液流量在总质量流量中的占比在除入口段外均保持在97%以上,可以在限定条件下将液池区域假设为凝结液流动区域。该文研究结果可为简化管内蒸汽凝结换热计算问题提供一定依据和思路。Due to various factors such as pipeline dimensions,vulnerability of the liquid film,and the size of measurement points,the current experimental research on condensation inside pipes yields a relatively low data density,which is insufficient to support the establishment of circumferential distribution characteristics.Thus,this paper derives a set of control equations for condensate flow and condensation phase change in both circumferential and axial directions.A mathematical solving model,characterizing the multidimensional distribution of key thermodynamic parameters in steam condensation phenomena inside pipes,is established through programming.The reliability of the model is validated by compared with experimental data and empirical formulas.Based on the computational results,the multidimensional distribution characteristics of key thermodynamic parameters during the condensation process are enhanced,and the effects of factors such as tilt angle and interfacial shear force on the calculation of steam condensation inside tubes are analyzed.The results indicate that for steam condensation heat transfer inside circular tubes in non-vertical orientations,the proportion of condensation in the condensate film region consistently exceeds 99%of the total condensation.Therefore,condensation in the liquid pool region can be disregarded in the calculations.For conditions with tilt angles less than or equal to 15°,the proportion of condensate flow in the condensate layer relative to the total mass flow rate remains above 97%,except at the entrance segment.Under specified conditions,the condensate layer can be assumed as the condensate flow area.This conclusion provides a foundation and direction for simplifying the calculation of steam condensation heat transfer inside pipes.

关 键 词：凝结换热 传热传质 数学求解 剪切力 周向分布 

分 类 号：TK124[动力工程及工程热物理—工程热物理]