节流孔出气模式对静压干气密封稳态性能影响

doi:10.11949/0438-1157.20190903

摘要/Abstract

摘要：

以径向单列和多列小孔节流静压干气密封为研究对象，采用湍流大涡模拟方法分析了节流孔位置和气膜厚度对单列小孔节流静压干气密封开启力、气膜刚度和泄漏率等稳态性能的影响，对比分析了不同节流孔径向出气模式和周向排布对径向多列节流静压干气密封稳态性能的影响，获得了不同膜厚条件下最佳的节流孔出气模式，在此基础上提出一种出气模式在线可调的新型静压干气密封结构。结果表明：相较于经典单列节流静压干气密封，小膜厚时（膜厚＜10 μm）径向上、下游同时开孔的多列节流静压干气密封，以及大膜厚时（膜厚>10 μm）径向上、中、下游同时开孔的多列节流静压干气密封开启力和气膜刚度显著提高，最大增幅分别达到15%和25%；通过选取合理的节流孔出气模式可满足不同条件下静压干气密封高气膜承载能力、低泄漏率和低耗气量的性能需求。

关键词: 静压干气密封, 数值模拟, 湍流, 计算流体力学, 节流孔

Abstract:

Taking hydrostatic dry gas seal (DGS) with single-row and multi-row orifices in the radial direction as the research object, the influence of orifice position and film thickness on steady-state performance, including opening force, film stiffness and leakage rate,of hydrostatic DGS with single-row orifice were analyzed utilizing large eddy simulation (LES) method, together with the influence of different exhaust modesand circumferential position of orifice on steady-state performance of hydrostatic DGS with multi-row orifices. The optimized exhaust modes for large opening force and low leakage rate were obtained at different film thickness, and a new type of hydrostatic DGS with adjustable exhaust mode was proposed on this basis. The results show that compared to typical hydrostatic DGS with single-row orifice, opening force and film stiffness of hydrostatic DGS with up-down stream orifices and with up-mid-down stream orifices enhanced remarkably at when film thickness smaller than 10 μm and larger than 10 μm, respectively. The maximum increment ratio of opening force and film stiffness of hydrostatic DGS with multi-row orifices are 15% and 25% larger than those of hydrostatic DGS with single-row orifice, respectively. By selecting a reasonable orifice outlet mode, it can meet the performance requirements of static gas dry gas seal high gas film carrying capacity, low leakage rate and low gas consumption under different conditions.

Key words: hydrostatic dry gas seal, numerical simulation, turbulent flow, computational fluid dynamics, orifice

中图分类号:

TH 117.2

车健, 江锦波, 李纪云, 彭旭东, 马艺, 王玉明. 节流孔出气模式对静压干气密封稳态性能影响[J]. 化工学报, 2020, 71(4): 1734-1743.

Jian CHE, Jinbo JIANG, Jiyun LI, Xudong PENG, Yi MA, Yuming WANG. Effect of orifice exhaust mode on steady performance of hydrostatic dry gas seal[J]. CIESC Journal, 2020, 71(4): 1734-1743.

图/表 14

图1 静压干气密封几何结构图

Fig.1 Geometric structure of hydrostatic dry gas seal

图2 静压干气密封计算流体域网格划分

Fig.2 Grid meshing of computing domain of hydrostatic dry gas seal

表1 静压干气密封初始计算参数

Table 1 Initial calculation parameters of hydrostatic dry gas seal

参数	数值	参数	数值
密封端面内径r_i/mm	29.5	均压槽深度h_d/mm	0.05
密封端面外径r_o/mm	36.5	节流孔个数N	12
节流孔位置半径r/mm	33.0	气膜厚度h/μm	12
节流孔直径d/mm	0.2	密封外径压力p_o/MPa	0.3
节流孔长度l/mm	0.5	密封内径压力p_i/MPa	0.1
均压槽宽度w/mm	1.0	节流气压力p_s/MPa	0.5

图3 不同数值模拟方法所得气膜压力分布与实测值对比

Fig.3 Film pressure obtained by different numerical simulation methods and measured values

图4 网格无关性验证

Fig.4 Grid independence verification

图5 经典小孔节流静压干气密封稳态性能参数随气膜厚度变化规律

Fig.5 Influence of film thickness on steady-state performance of hydrostatic dry gas seal with normal orifice-type restrictor

图6 节流孔径向位置对静压干气密封稳态性能影响

Fig.6 Influence of orifice radial position on steady-state performance of hydrostatic dry gas seal

图7 径向多列节流孔静压干气密封端面结构示意图

Fig.7 Geometric structure of hydrostatic dry gas seal surface with multi-row orifices

图8 不同出气模式静压干气密封开启力与泄漏率

Fig.8 Effect of exhaust mode on opening force and leakage rate of hydrostatic dry gas seal

图9 不同出气模式下静压干气密封径向压力分布

Fig.9 Radial pressure distribution of hydrostatic dry gas seal with different exhaust mode

图10 不同出气模式静压干气密封稳态性能参数随膜厚变化规律

Fig.10 Effect of exhaust mode on steady-state performance of hydrostatic dry gas seal under different film thickness

图11 一种出气模式可调静压干气密封静环及调节环结构示意图

Fig.11 Geometric structure of stator ring and adjust ring of a hydrostatic dry gas seal with adjustable exhaust mode

图12 不同调节环周向夹角对应的静压干气密封出气模式

Fig.12 Exhaust modes of hydrostatic dry gas seal with different circumferential angle of adjust ring

图13 不同出气模式对应的静压干气密封稳态性能参数

Fig.13 Steady-state performance of hydrostatic dry gas seal with different exhaust modes

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