摘要
为了掌握汽轮机非接触式迷宫密封的漏泄特性进而指导工程设计,采用CFD方法对不同工况下,不同结构尺寸的阶梯式和直通式密封通道内的流动特性进行数值仿真,并对漏泄特性进行了详细分析。仿真结果表明,减小压比和间隙尺寸、增加节流数、减小腔室梯形腰与轴的夹角可有效降低蒸汽漏泄量,而漏泄量对旋转轴转速不敏感。
To investigate leakage characteristic of labyrinth seal of steam turbine for engineering design, the flow fields in straight and stepped labyrinth seal passages are numerically simulated by computational fluid dynamics（CFD） method in different conditions and ＂structural sizes and shapes. Subsequently, the flow characteristic in labyrinth seal is analyzed in detail. Simulation results show that the leakage can be effectively reduced by decreasing the pressure ratio, the clearance width, or the angle between axis and cavity edge, or by increasing the number of throttles, but the leakage is insensitive to the speed of rotor.
出处
《鱼雷技术》
2013年第5期364-368,共5页
Torpedo Technology
关键词
汽轮机
迷宫密封
漏泄量
数值仿真
steam turbine
labyrinth seal
leakage
numerical simulation
