基于熵产理论的100MW级光热电站多级熔盐泵内部能量损失特性分布  

Distribution of Internal Energy Loss Characteristics in Multi-stage Molten Salt Pumps for 100 MW Solar Power Plant Based on Entropy Production Theory

作　　者：支银鹤 王珊珊 陆佳铭 胡永海 张德胜[1] Zhi Yinhe;Wang Shanshan;Lu Jiaming;Hu Yonghai;Zhang Desheng(National Research Center of Pumps,Jiangsu University,Zhenjiang,Jiangsu 212013,China;Power China SPEM Limited Company,Shanghai 201316,China)

机构地区：[1]江苏大学国家水泵及系统工程技术研究中心,江苏镇江212013 [2]中国电建集团上海能源装备有限公司,上海201316

出　　处：《机电工程技术》2024年第9期76-80,共5页Mechanical & Electrical Engineering Technology

基　　金：中央国资委科技专项(DJ-HXGG-2022-18)。

摘　　要：为了研究多级熔盐泵的能量特性,由于传统压降法无法确定能量损失来源及类型,为此,采用了一种新的分析方法,将数值模拟与熵产理论相结合来研究熔盐泵的内部流动情况及熵产分布。建立了多级熔盐泵三维全流道流体域模型;利用CFD方法对熔盐泵内不同工况下的流动进行了模拟;根据热力学第二定律,基于熵产理论对不同流量下泵内过流部件的能量损失及损失类型进行了定量分析并对各级叶轮和导叶的湍流熵产损失进行了详细讨论。研究结果显示:湍流熵产和壁面熵产是主要的损失类型,两者占能量总损失的99%以上。不同流量工况下,导叶和叶轮是产生能量损失的主要部件,期间产生的损失占总熵产损失的81%以上。各级导叶的湍流熵产随流量增大呈现先下降后上升的趋势,最小熵产出现在1.0Q_(opt)~1.4Q_(opt),且随着级数增加,导叶最小熵产出现的工况更加靠近设计工况。叶轮中的湍流熵产存在明显的级间差异,首级叶轮的湍流熵产随流量增加不断减小,在1.6Q_(opt)工况下达到最小值570.874W,随后略有上升。To study the energy characteristics of multistage molten salt pumps,the source and type of energy loss cannot be determined by the traditional pressure drop method.Therefore,a new analytical method is adopted to combine numerical simulation with entropy production theory to study the internal flow and entropy production distribution of molten salt pumps.Firstly,a three-dimensional full-channel fluid domain model of a multistage molten salt pump is established.Subsequently,the CFD method is used to simulate the flow conditions in the molten salt pump under different working conditions.Finally,according to the second law of thermodynamics,based on the entropy production theory,the energy loss and loss type of the overflow components in the pump under different flow rates are quantitatively analyzed,in which the turbulent entropy production loss of the impeller and guide vane at all levels is further discussed in detail.The results of the study showed that:turbulent entropy and wall entropy are the main types of loss,accounting for more than 99%of the total energy loss.Under different flow conditions,the guide vane and impeller are the main components that produce energy loss,and the entropy production loss generated in these two overflow components accounts for more than 81%of the total entropy production loss.With the increase of flow,the turbulent entropy production of guide vanes at all levels showed a trend of first decreasing and then increasing.The minimum entropy yield occurs at 1.0Qopt~1.4Qopt.At the same time,as the number of stages increases,the working conditions of the minimum entropy production of the guide vanes are closer to the design conditions.There is a significant inter-stage difference in turbulent entropy production in the impeller.The turbulent entropy production of the first stage impeller decreases with the increase of flow rate,reaching a minimum of 570.874 W at 1.6Qopt,and then increased slightly.

关 键 词：熵产理论 多级熔盐泵 能量损失特性 

分 类 号：TM615[电气工程—电力系统及自动化]