叶冠齿数和齿顶间隙对涡轮气动性能的影响  

Effect of the Shroud Seal Number and the Tip Clearance on the Aerodynamic Performance of the Turbine

作　　者：应银生 马石[2] 

机构地区：[1]江南造船集团责任有限公司,上海201913 [2]海军工程大学动力工程学院,武汉430033

出　　处：《航空制造技术》2016年第1期128-131,135,共5页Aeronautical Manufacturing Technology

基　　金：国家自然科学基金创新研究群体科学研究基金资助项目(50721005)

摘　　要：通过数值方法对某1.5级带冠涡轮的流场进行研究,对比分析了不同叶冠齿数和齿顶间隙对涡轮气动性能的影响。研究结果表明,泄漏流与主流掺混后形成一个涡流区,改变了叶栅上半通道的流场结构,使得顶部流体以负攻角进入下级静叶,造成攻角损失,改变了下级静叶的气动性能。同时发现间隙相对于齿数对涡轮气动性能的影响程度更为显著,间隙相同,齿数从1增加到4时,涡轮效率增加0.75%;齿数相同,间隙从2mm减小到0.5mm时,涡轮效率增加1.82%。A 1.5 stage turbine with shroud is studied by using a numerical simulation program. The effects of the shroud seal number and the tip clearance on the turbine aerodynamic performance are analyzed. The simulation results show that mixing between leakage and main flows leads to a turbulence area, alters the flow structure of the upper half channel, the suction side incidence of the re-entering leakage flow in the subsequent stator causes additional losses, and alters the aerodynamic performance of the next stator. In addition, compared with the number of seal, the influence of the tip clearance on the turbine aerodynamic performance is more obvious. In the same tip clearance, with the seal number increases from 1 to 4, the turbine efficiency increased 0.75%. In the same seal number, with the tip clearance decreased from 2mm to 0.5mm, the turbine efficiency increases 1.82%.

关 键 词：叶冠 齿数 间隙 气动性能 涡轮效率 

分 类 号：TK14[动力工程及工程热物理—热能工程]