中国电机工程学报2024，Vol.44Issue(6)：2319-2329,后插20,12.DOI:10.13334/j.0258-8013.pcsee.221896
高速S-CO2向心透平几何参数优化及变工况特性分析
Geometric Parameter Optimization and Off-design Performance Analysis of A High-speed S-CO2 Radial-inflow Turbine
摘要
Abstract
The turbine is the core equipment for realizing heat-power conversion in the thermodynamic cycle.Optimizing its geometric parameters to enhance its aerodynamic characteristics is an efficient approach to boosting the thermal efficiency of the entire cycle system.Drawing from the design parameters of the supercritical carbon dioxide turbine utilized in waste heat recovery for marine main engines,we have achieved the calibration of key geometric parameters for the high-speed radial-inflow turbine.Using the CFX simulation method coupled with the real physical parameters of CO2 in the database,the influence laws of geometric parameters rotor,stator blade wrap angle,and impeller outlet geometric angle on the performance of the turbine are analyzed in detail.The operation characteristics of the radial-inflow turbine under the off-design operating conditions are further studied.Simulation results indicate that increasing the wrap angle of stator blade will cause disturbance eddy current at the leading edge of rotor blade and reduce exit loss.With the increase of impeller outlet angle,the influence of the rotor blade wrapping angle on turbine efficiency remains unchanged,but the peak point of isentropic efficiency will move along the direction of the rotor blade wrap angle decreasing.Through optimization analysis,the isentropic efficiency of the turbine design point is 87.99%when the wrap angle of the rotor and stator blades and the geometric angle of the impeller outlet are 49,21.5,and 25,respectively,which is 0.54 percentage points higher than that before optimization.The isentropic efficiency of a radial-inflow turbine is more than 80%when it deviates from the design point by 20%up and down.The results can provide reference for the design of the supercritical carbon dioxide high-speed radial-inflow turbine.关键词
S-CO2向心透平/CFX仿真/气动性能/几何参数优化/变工况Key words
S-CO2 radial-inflow turbine/CFX simulation/aerodynamic performance/geometric parameter optimization/off-design performance分类
能源科技引用本文复制引用
孙玉伟,陈晨,秦天阳,袁成清,赵庆..高速S-CO2向心透平几何参数优化及变工况特性分析[J].中国电机工程学报,2024,44(6):2319-2329,后插20,12.基金项目
工信部高技术船舶科研项目(工信部装函[2017]614 号).Ministry of Industry and Information Technology high-tech ship scientific research project([2017]No.614). （工信部装函[2017]614 号）
