叶冠与篦齿参数对末级带冠长叶片叶顶流动与损失的影响  

Effect of Shroud and Labyrinth Seal Parameters on Flow and Loss at the Tip of the Last Stage Shrouded Long Blade

作　　者：余开拓 汪全中 罗磊[1] 闫晗 YU Kaituo;WANG Quanzhong;LUO Lei;YAN Han(School of Energy Science and Engineering,Harbin Institute of Technology,Harbin,China,150001;AECC Hunan Aviation Powerplant Research Institute,Zhuzhou,China,412002)

机构地区：[1]哈尔滨工业大学能源科学与工程学院,黑龙江哈尔滨150001 [2]中国航发湖南动力机械研究所,湖南株洲412002

出　　处：《热能动力工程》2024年第10期46-55,共10页Journal of Engineering for Thermal Energy and Power

基　　金：黑龙江省优秀青年基金(YQ2021E023)。

摘　　要：为了研究叶冠与篦齿参数对末级带冠长叶片叶顶流动与损失的影响,选取某300 MW重型燃气轮机涡轮的末级带冠动叶为研究对象,采用数值模拟的方法研究了叶顶间隙、出口空腔长度、篦齿数量对末级带冠长叶片流动与损失的影响规律,分析不同几何参数对末级带冠长叶片叶顶流动的影响机理。结果表明:不同叶冠与篦齿参数对末级带冠长叶片流动与损失的影响程度与机理均不同;叶顶间隙变化造成的影响最为显著,叶顶间隙增大造成叶冠泄漏流量与损失急剧增大;出口空腔长度增大造成叶冠内部损失增大,但减小了叶冠出口端壁区域的回流区;篦齿数量增加提高了篦齿对流体的阻碍封严能力,从而降低叶冠出口损失。In order to study the effect of shroud and labyrinth seal parameters on flow and loss at the tip of the last stage shrouded long blade,the last stage shrouded rotor blade of a 300 MW heavy-duty gas tur-bine was selected as the research object.The effects of three geometric parameters,including tip clear-ance,outlet cavity length and labyrinth seal number,on the flow and loss of the last stage shrouded long blade were studied by numerical simulation method,and the influence mechanism of different geometric parameters on the tip flow of the last stage shrouded long blade was analyzed.The results show that differ-ent shroud and labyrinth seal parameters have different effects and mechanisms on the flow and loss of the last stage shrouded long blade.The most significant effect is caused by the change of the clearance of the blade tip.The increase of blade tip clearance causes the sharp increase of shroud leakage flow and loss.The increase of the outlet cavity length causes the increase of the internal loss of the shroud,but it re-duces the reflux area of the end wall area at the shroud outlet.The increase of the number of labyrinth seals improves the blocking and sealing ability of the labyrinth seals to the fluid,thereby reducing the outlet loss of the shroud.

关 键 词：末级涡轮长叶片 叶冠 篦齿 几何参数 泄漏流动 损失 

分 类 号：TK471[动力工程及工程热物理—动力机械及工程]