摘要
以太阳能热发电高温熔盐泵为研究对象,对不同介质条件下熔盐泵内部流动特性和圆盘损失进行分析。对比清水试验和数值计算结果,验证数值计算的可行性,通过对清水、300℃熔盐、565℃熔盐条件下熔盐泵流场进行计算,获得首级泵段内清水和不同温度下熔盐在熔盐泵内的速度、压力分布,分析了介质物性对泄漏量、圆盘损失以及盖板剪切应力分布产生的影响。结果显示:介质物性对扬程和流场速度分布影响有限,介质密度增加会使流场压力增加;介质粘性越大叶轮口环处剪切应力越大,同时总泄漏量会得到降低;介质密度和粘性增加会使圆盘损失能量消耗增加,粘性增加会导致圆盘损失绝对能量和占损失能量比增加;粘性对盖板上的剪切应力影响较大,同时对应半径处前盖板处的剪切应力高于后盖板上的剪切应力。通过以上研究更加深入地了解高温熔盐在熔盐泵内的流动特性,为提升泵性能和优化泵结构提供参考。
A high temperature molten salt pump(MSP)for concentrating solar power(CSP)was taken as the research object to research the effect of temperature on flow properties and disk friction loss with different mediums.The model pump test and calculation with water were compared to verify the reliability.Then the flow field of molten salt pump(MSP)was calculated with molten salt at 300℃and 565℃.The velocity and pressure distribution of different medium and different temperature molten salt in the molten salt pump were obtained in the first stage of the pump,and the ring leakage,disk friction loss and the shear stress distribution on shroud were analyzed.The results show that medium properties have little effect on pump performance and internal flow velocity distribution,but the pressure of internal flow increase with medium density.The comprehensive analysis of viscosity shows that there is an evident effect of shear stress and viscosity increase can control the leakage at ring.The key factors affecting disk friction loss are density and viscosity,and the disk friction loss and the disk friction loss energy percentage of loss energy increase with the two factors.Viscosity is the most influential factor of shroud shear stress,and the shear stress on front shroud is higher than rear shroud.The purpose of molten salt pump internal flow research is to provide references for improving pump performance and optimizing pump structure.
作者
金永鑫
张德胜
石磊
施卫东
王道红
Jin Yongxin;Zhang Desheng;Shi Lei;Shi Weidong;Wang Daohong(Research Center of Fluid Machinery Engineering and Technology,Jiangsu University,Zhenjiang 212013,China;School of Mechanical Engineering,Nantong University,Nantong 226019,China;Jiangsu Feiyue pump Group Co.,Ltd.,Taizhou 214537,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2020年第11期176-184,共9页
Acta Energiae Solaris Sinica
基金
国家重点研发计划(2017YFC0404201)
江苏省成果转化项目(BA2016167)
江苏省研究生科研创新计划(KYCX17_1772)。
关键词
熔盐泵
太阳能热发电
介质物性
流动特性
圆盘能量损失
molten salt pump(MSP)
concentrating solar power(CSP)
medium properties
flow characteristic
disk friction loss
