超临界二氧化碳向心透平设计与热流固耦合研究  

Design and Thermal-Fluid-Solid Coupling Investigation of Supercritical Carbon Dioxide Radial Inflow Turbine

作　　者：赵攀[1] 温玉聪 娄聚伟 杨培军 周林 张瑜[1] 王江峰[1] ZHAO Pan;WEN Yucong;LOU Juwei;YANG Peijun;ZHOU Lin;ZHANG Yu;WANG Jiangfeng(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Xi’an Xire Boiler&Environmental Protection Engineering Co.Ltd.,Xi’an 710054,China;Guoneng Changyuan Hanchuan Power Generation Co.Ltd.,Xiaogan,Hubei 432000,China)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]西安西热锅炉环保工程有限公司,西安710054 [3]国能长源汉川发电有限公司,湖北孝感432000

出　　处：《西安交通大学学报》2022年第11期83-94,共12页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(51876152,51976147);陕西省杰出青年科学基金资助项目(2021JC-05)。

摘　　要：为了适应兆瓦级超临界二氧化碳(SCO_(2))布雷顿循环系统的需求,本文在1 MW功率等级SCO_(2)向心透平设计基础上,通过雷诺平均Navier-Stokes方程(RANS)的方法开展了透平流道内流动的三维数值模拟,分析了透平的变工况性能,研究了叶顶间隙的大小对流动效率的影响规律。基于热流固耦合方法,根据数值模拟结果与透平叶轮的实际运行条件,施加相应热载荷与气动载荷,并考虑到轮背泄漏流引起的轴向推力,开展了透平动叶轮的运行安全性分析。结果表明:设计工况下透平的等熵效率达到83.53%,输出功率达到1188.57 kW,所设计的透平具有良好的变工况性能;采用TC4钛合金制造的透平叶轮的最大总形变为0.570 mm,其中最大轴向形变为0.303 mm,叶轮结构的内部应力远小于材料的屈服强度。本文的工作可为未来兆瓦级SCO_(2)布雷顿循环系统的透平研制提供基础数据与理论支撑。In this paper,a 1 MW supercritical carbon dioxide(SCO_(2)) radial inflow turbine is designed to meet the requirement of a MW-class SCO_(2) Brayton cycle system.The three-dimensional numerical simulation is carried out by RANS(Reynolds-averaged Navier-Stokes)equations.The off-design performance of the turbine is analyzed and the influence of the tip clearance on the efficiency is also investigated.The operation safety of the turbine impeller is analyzed with the thermal-fluid-structure coupling method.Based on the numerical simulation results and actual operating conditions of the turbine impeller,the corresponding thermal load and aerodynamic load were applied in this process.The axial force caused by the leakage flow at the backface cavity of impeller is also considered.The results show that the isentropic efficiency and the output power of turbine under design conditions are 83.53%and 1188.57 kW,respectively.The SCO_(2) turbine exhibits good off-design performance.The maximum total deformation of the turbine impeller made of titanium alloy TC4 is 0.570 mm while the maximum axial deformation is 0.303 mm.The stress of the impeller is far smaller than the material yield strength.The research results can provide basic data and theoretical support for the turbine design of MW-class SCO_(2) Brayton cycle system.

关 键 词：超临界二氧化碳 向心透平 热流固耦合方法 

分 类 号：TK14[动力工程及工程热物理—热能工程]