叶顶间隙对超临界二氧化碳向心透平性能的影响  

Influence of Blade Tip Clearance on Performance of Supercritical Carbon Dioxide Radial Inflow Turbine

作　　者：童志庭 邢浩 张超[1,2] 俞洁 TONG Zhi-ting;XING Hao;ZHANG Chao;YU Jie(Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control,Tianjin University of Techonology,Tianjin,China,Post Code:300384;National Demonstration Center for Experimental Mechanical and Electrical Engineering Education,Tianjin University of Techonology,Tianjin,China,Post Code:300384)

机构地区：[1]天津理工大学天津市先进机电系统设计与智能控制重点实验室,天津300384 [2]天津理工大学机电工程国家级实验教学示范中心,天津300384

出　　处：《热能动力工程》2022年第9期66-72,共7页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金(51976139)。

摘　　要：为探究叶顶间隙对超临界二氧化碳向心透平机性能的影响,以某超临界二氧化碳向心透平为例,设置不同叶顶间隙,利用计算流体动力学(CFD)仿真软件进行数值模拟。结果表明:当径向间隙等于轴向间隙时,间隙尺寸在0.1~0.5 mm范围内,叶顶间隙与叶轮出口叶高的比值每增大1%,总-静效率降低1.07%左右。当径向间隙不等于轴向间隙时,轴向间隙每增大1%,总-静效率降低0.146%左右,径向间隙每增大1%,总-静效率大约降低0.362%;径向间隙对于透平性能的影响远大于轴向间隙,叶顶间隙在0.1~0.5 mm范围内时,径向间隙对总-静效率的影响约为轴向间隙的2倍。In order to investigate the influence of blade tip clearance on the performance of supercritical carbon dioxide radial inflow turbine,taking a S-CO_(2) radial inflow turbine as an example,different blade tip clearances were set and computational fluid dynamics(CFD)simulation software was used for numerical simulation.The results show that when the radial clearance is equal to the axial clearance,the clearance size is within 0.1 mm to 0.5 mm,and the total-static efficiency decreases by about 1.07%with the increase of the ratio of tip clearance and outlet blade height of 1%.When the radial clearance is not equal to the axial clearance,the total-static efficiency decreases by about 0.146%with the increase of axial clearance of 1%;the total-static efficiency decreases by about 0.362%with the increase of radial clearance of 1%.The influence of radial clearance on turbine performance is much larger than that of axial clearance,and the influence of radial clearance on total-static efficiency of turbine is about twice that of axial clearance when the blade tip clearance size is within 0.1 mm to 0.5 mm.

关 键 词：向心透平 二氧化碳 叶顶间隙 

分 类 号：TK14[动力工程及工程热物理—热能工程]