塔式太阳能发电系统S-CO_(2)向心透平气动性能优化  

OPTIMIZATION OF AERODYNAMIC PERFORMANCE OF S-CO_(2) RADIAL INFLOW TURBINE FOR TOWER SOLAR POWER GENERATION SYSTEM

作　　者：韩旭[1] 杨依栋 施海波 李奇[1] 韩中合[1] Han Xu;Yang Yidong;Shi Haibo;Li Qi;Han Zhonghe(Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学河北省低碳高效发电技术重点实验室,保定071003

出　　处：《太阳能学报》2024年第12期197-205,共9页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(52106010);中央高校基本科研业务费专项资金(2022MS084)。

摘　　要：针对基于超临界二氧化碳布雷顿循环的塔式太阳能发电系统,采用热力设计与气动设计结合的方法,设计超临界二氧化碳工质向心透平,探究透平内部流动特性、损失情况,泄漏涡形成与发展以及不同动叶包角下透平性能的变化规律。结果显示:动叶内部损失主要集中在动叶轴向流域上部,由于叶顶间隙存在,从动叶吸力面向压力面过来的泄漏流与主流相互掺混,在动叶子午面转折角处形成较大的泄漏涡,并不断卷吸在轴向流域形成螺旋状流动。通过增大动叶包角能有效抑制涡流在流道内的发展,同时降低余速损失,但也会造成叶片载荷增加、叶顶泄漏强度提升、整机反动度和摩擦损失增加。通过动叶包角优化后,在45°包角时透平效率达到最大值82.18%,相较于优化前效率提升0.84%。For the tower solar power generation system based on the supercritical CO_(2) Brayton cycle,the main thermal parameters of the radial inflow turbine are given by combining thermal design and aerodynamic design.The internal flow characteristics and loss,formation and development of leakage vortices,and the change law of turbine performance under different rotor blade wrapping angles are explored through numerical simulation.The results show that the internal loss of the rotor blade is mainly concentrated in the upper part of the axial basin of the rotor blade,and due to the existence of the leaf top gap,the leakage flow coming from the pressure plane of the driven blade suction is mixed with the main stream,forming a large leakage vortex at the turning angle of the meridian surface of the rotor blade and continuously sucking to form a spiral flow in the axial basin.By increasing the blade wrap angle,the development of eddy currents in the flow channel can be effectively suppressed,while reducing residual speed loss,but it will also increase in blade load,blade tip leakage strength,overall reaction and friction loss.After the optimization of the rotor blade wrapping angle,the turbine efficiency reaches a maximum of 82.18%at a wrapping angle of 45°,which is 0.84%higher than that before optimization.

关 键 词：太阳能 布雷顿循环 向心透平 气动分析 包角 

分 类 号：TK14[动力工程及工程热物理—热能工程]