浮环密封流场数值模拟及泄漏率公式的修正

Simulation of Flow Field in a Floating Ring Seal and Modification of Its Leakage Rate Expression

应用GAMBIT软件,采用六面体网格和楔形网格的混合网格单元类型对节流间隙的计算区域进行网格划分。使用FLUENT软件,以层流模型为基础,采用SIMPLE算法,对不同轴径及工作参数下的浮环节流间隙进行了3维数值模拟。通过对模拟数据进行拟合处理,得到新的周向临界雷诺数经验计算公式和层流状态下的泄漏量计算公式。研究表明,在其他参数不变情况下,泄漏量随浮环偏心率、间隙高度、压差的增大而增大,而轴的旋转速度变化对泄漏量的影响很微小。研究结果为浮环密封的设计及进一步研究提供了参考。

By using GAMBIT software,the computational domain of the throttle clearance was meshed in the mixed grid unit type of hexahedron and wedge. Based on laminar flow model,three dimensional numerical simulation of the working state of floating ring＇s throttle clearance under different axis diameters and working conditions was carried out in FLUENT through SIMPLE algorithm. Two new equations,one of which can be used to calculate the critical circumferential Reynolds number for eccentric annular space and the other can be used to calculate leakage rate,were obtained from the simulation data. The results indicated that the leakage increased with the increase of eccentricity ratio,height of gap and pressure drop,while the influence of the axis＇ rotation speed was negligible. The results laid a foundation for further investigation and design of a floating ring seal.