Flow simulation and sealing performance test of ultra-high speed dry gas seal under multiple effects

doi:10.11949/0438-1157.20230285

Abstract

Abstract:

In order to investigate the law of gas film flow field of ultra-high speed dry gas seals in major key equipment, considering the turbulence effect, inertia effect, real gas effect, and choked flow effect caused by ultra-high speed on the gas film flow field and sealing performance, a turbulence calculation model under multiple effects was constructed. The test verifies the correctness and validity of the theoretical model, and explores the influence of different operating conditions and structural parameters on the sealing performance under the ultra-high speed condition. The results show that the leakage rate increases with the increase of rotational speed and medium pressure under the turbulence effect; the opening force decreases slightly with the increase of rotational speed and then gradually increases, while the opening force increases nonlinearly with the increase of medium pressure. In this example, under ultra-high speed working conditions (50000 r/min, 11 MPa), the optimization results show that the spiral angle should be selected as 16°, and the groove depth should be selected in the range of 6—7 μm. This provides theoretical support for the design and manufacture of ultra-high speed dry gas seals.

Key words: ultra-high speed, dry gas seal, turbulence effect, numerical simulation, experimental study

摘要：

为探究重大关键设备中超高速干气密封的气膜流场规律，考虑超高转速产生的湍流效应、惯性效应、真实气体效应、阻塞流效应对气膜流场和密封性能的影响，构建多重效应下湍流计算模型。试验验证理论模型的正确性和有效性，并探索超高速条件下不同工况参数和结构参数对密封性能的影响。研究结果表明：湍流效应下，泄漏率随转速和介质压力的增大而增大；开启力随转速的增大先略微减小后逐渐增大，而随介质压力的增大非线性提升。本实例超高速工况下(50000 r/min、11 MPa)，优化结果表明螺旋角选择16°，槽深则在6~7 μm范围内选择。这为设计和制造超高速干气密封提供了理论支撑。

关键词: 超高速, 干气密封, 湍流效应, 数值模拟, 试验研究

CLC Number:

TH 136

Junhua DING, Shurong YU, Shipeng WANG, Xianzhi HONG, Xin BAO, Xuexing DING. Flow simulation and sealing performance test of ultra-high speed dry gas seal under multiple effects[J]. CIESC Journal, 2023, 74(5): 2088-2099.

丁俊华, 俞树荣, 王世鹏, 洪先志, 包鑫, 丁雪兴. 多重效应下超高速干气密封流场模拟及密封性能试验[J]. 化工学报, 2023, 74(5): 2088-2099.

Figures/Tables 14

Fig.1 Geometric model of ultra-high speed dry gas seal

Fig.2 Flow chart for numerical solution of ultra high speed dry gas seal

Fig.3 Layout of sealing test bench

Fig.4 Physical picture of sealing test bench

Table 1 Structural parameters of ultra high speed dry gas seal

参数	数值
密封轴径/mm	35
螺旋槽根径/mm	72
平衡直径/mm	71
槽数/个	12
槽深/μm	6
密封端面外径/mm	91
密封端面内径/mm	66
弹簧力/N	56
螺旋角/(°)	16

Fig.5 Schematic diagram of the path for leak rate testing

Fig.6 Grid-independence verification

Fig.7 Model validation

Fig.8 Pressure field distribution under different working conditions and structures

Table 2 Working conditions and structural parameters of pressure field simulation calculation cases

案例	转速/（r/min）	介质压力/MPa	螺旋角/（°）	槽深/μm
1	10000	5	16	6
2	50000	11	16	6
3	50000	11	20	6
4	50000	11	16	3

Fig.9 Trend chart of opening force changing with speed

Fig.10 Trend chart of opening force changing with medium pressure

Fig.11 The influence of spiral angle on sealing performance

Fig.12 The influence of spiral groove depth on sealing performance

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