液氢潜液泵泵池内漏热及两相流动特性数值模拟  

Numerical simulation of heat leakage and two-phase flow characteristics in pump sump of liquid hydrogen submersible pump

作　　者：赵梓栋 王维博 魏爱博 胡赟 张小斌[1,2] Zhao Zidong;Wang Weibo;Wei Aibo;Hu Yun;Zhang Xiaobin(Institute of Refrigeration and Cryogenic,Zhejiang University,Hangzhou 310027,China;Provincial Key Laboratory of Hydrogen Energy Storage and Transportation Technology and Equipment,Hangzhou 310027,China;Hangzhou Hangyang Koso Pump&Valve Co.,Ltd,Hangzhou 311300,China)

机构地区：[1]浙江大学制冷与低温研究所,杭州310027 [2]浙江省全省氢能储输技术与装备重点实验室,杭州310027 [3]杭州杭氧工装泵阀有限公司,杭州311300

出　　处：《低温工程》2025年第1期12-19,共8页Cryogenics

基　　金：国家重点研发计划(2022YFB4002900)。

摘　　要：为了探究潜液式液氢泵电机发热引起的气泡对泵吸入口流动的影响,建立了液氢低温潜液泵泵池内流固耦合两相流CFD数值模型,分析了不同泵装置气蚀余量(NPSHa)下泵池内三维流场、温度场及相位分布的瞬态特性,特别关注蒸发产生的气泡在泵池内的动态分布。研究结果表明,在不同NPSHa下,泵池内由于电机发热,周围局部液氢会气化产生两相流,泵池内温度分布与两相分布保持稳定;部分未经泵池出口排出的气相会聚集在泵池上方,形成稳定的分界层,且不会对流到泵诱导轮吸入口,即漏热及电机发热等产生的两相流不会对液氢潜液泵的稳定运行产生影响,验证了液氢泵与泵池设计方案的合理性和可靠性;但当NPSHa低于0.9 m时,泵池中过多的气相会导致泵转动部件与电机散热及润滑恶化,可能会导致潜液泵运行失稳与损坏。To investigate the impact of vapor bubbles induced by the heat generation of the submerged liquid hydrogen pump motor on the flow at the pump’s suction inlet,a computational fluid dynamics(CFD)numerical model of the fluid-solid coupled two-phase flow within the sump of a cryogenic submerged liquid hydrogen pump was developed.The model was employed to analyze the transient characteristics of the three-dimensional flow field,temperature field,and phase distribution within the pump sump under various net positive suction head(NPSHa)conditions,with particular emphasis on the dynamic distribution of bubbles generated by evaporation within the pump sump.Research findings indicate that at different NPSHa levels,localized vaporization of liquid hydrogen around the motor due to heating leads to the formation of a two-phase flow,while the temperature and phase distributions in the pump sump maintain stability.Some of the non-exhausted gas accumulates above the pump sump,forming a stable boundary layer that does not interfere with the suction inlet of the pump inducer,thus confirming that the two-phase flow caused by heat leakage and motor heating does not compromise the stable operation of the submerged liquid hydrogen pump,validating the rationality and reliability of the pump and pump sump design.However,when NPSHa falls below 0.9 meters,excessive gaseous phase can adversely affect the rotation of pump components and the motor’s cooling and lubrication,potentially leading to operational instability and damage to the submerged liquid pump.

关 键 词：潜液泵 泵池 液氢 两相流 CFD 

分 类 号：TK91[动力工程及工程热物理] TB663[一般工业技术—制冷工程]