微间隙高速流体效应对箔片柱面气膜密封性能影响研究

doi:10.11949/0438-1157.20240505

摘要/Abstract

摘要：

以超临界二氧化碳为润滑介质，考虑湍流、阻塞、惯性等高速流体效应建立箔片柱面气膜密封润滑理论模型，研究了不同高速流体效应组合下密封端面流场、箔片变形的变化规律，揭示了高速高压超临界二氧化碳箔片柱面气膜密封的运行机理，进一步分析了工况和结构参数对密封性能的影响规律，获得了结构参数的优选范围。结果表明：湍流效应对超临界二氧化碳箔片柱面气膜密封润滑界面流场和密封性能影响较大，阻塞效应和惯性效应影响相对较小；各流体效应之间存在交互作用，湍流效应会使阻塞出口边界压力减小，而惯性效应会使阻塞出口边界压力增大，且湍流效应条件下惯性效应对气膜浮升力的影响作用更为显著；当长径比取2.0~2.5，柔度系数取0.001~0.003，密封性能较优。

关键词: 箔片密封, 超临界二氧化碳, 高速流体效应, 密封性能, 数值分析

Abstract:

Using supercritical carbon dioxide as the lubrication, considering high-speed fluid effects such as turbulent, blockage, and inertia effects, we establish a theoretical model for the lubrication of compliant foil cylindrical gas film seal. The study investigates the variations in the seal end flow field and foil deformation under different combinations of high-speed fluid effects, revealing the operational mechanism of high-speed, high-pressure supercritical carbon dioxide compliant foil cylindrical gas film seal. Furthermore, the impact of operating conditions and structural parameters on sealing performance is analyzed, providing an optimal range for structural parameters. The results show that turbulent effects have a significant impact on the flow field and sealing performance of the supercritical carbon dioxide compliant foil cylindrical gas film seal lubrication interface, while blockage and inertia effects are relatively minor. There are interactions among various fluid effects: turbulent effects reduce the pressure at the blockage exit boundary, while inertia effects increase it. Moreover, under turbulent conditions, inertia effects have a more significant impact on the float force. Optimal sealing performance is achieved when the length-to-diameter ratio is between 2.0-2.5 and the flexibility coefficient is between 0.001-0.003.

Key words: compliant foil seal, supercritical carbon dioxide, high-speed fluid effects, sealing performance, numerical analysis

中图分类号:

TH117.2

江澳翔, 陈源, 李运堂, 江锦波, 彭旭东, 章聪, 王冰清. 微间隙高速流体效应对箔片柱面气膜密封性能影响研究[J]. 化工学报, DOI: 10.11949/0438-1157.20240505.

Aoxiang JIANG, Yuan CHEN, Yuntang LI, Jinbo JIANG, Xudong PENG, Cong ZHANG, Bingqing WANG. Study on the influence of micro-gap high-speed fluid effects on compliant foil cylindrical gas film seal performance[J]. CIESC Journal, DOI: 10.11949/0438-1157.20240505.

图/表 15

图1 箔片柱面气膜密封结构及润滑原理示意图

Fig.1 Schematic diagram of CFCGS structure and lubrication principle

图2 弹性箔片结构及参数表征

Fig.2 Compliant foil structure and parameter characterization

表1 工况参数

Table 1 Working condition parameters

参数名称	数值
环境压力p_a / MPa	0.1
进口压力p_in /MPa	8
出口压力p_out / MPa	/
转速n /(r/min)	30000
介质温度T /K	314

表2 结构参数

Table 2 Structural parameters

变量名称	数值
半径R /mm	25.4
密封长度L /mm	50.8
半径间隙C /μm	10
偏心率e	0.6
波箔片厚度t_b /mm	0.8
波箔片节距s / mm	4.572
波箔片半弦长l / mm	1.778
泊松比	0.3
弹性模量/ GPa	214

表3 高速流体效应组合模型

Table 3 High-speed fluid effects combination model

高速流体效应	Case Ⅰ	Case Ⅱ	Case Ⅲ	Case Ⅳ	Case Ⅴ	Case Ⅵ
湍流效应	忽略	考虑	忽略	考虑	忽略	考虑
阻塞效应	忽略	忽略	考虑	考虑	考虑	考虑
惯性效应	忽略	忽略	忽略	忽略	考虑	考虑

图3 流场程序验证

Fig.3 Flow field program validation

图4 高速流体效应组合模型的气膜速度分布

Fig.4 Gas film velocity distribution of high-speed fluid effects combination model

图5 高速流体效应组合模型的气膜压力分布

Fig.5 Gas film pressure distribution of high-speed fluid effects combination model

图6 高速流体效应组合模型的箔片变形分布

Fig.6 Distribution of foil deformation of high-speed fluid effects combination model

图7 进口压力对密封性能的影响

Fig.7 The influence of inlet pressure on seal performance

图8 转速对密封性能的影响

Fig.8 The influence of rotational speed on seal performance

图9 温度对密封性能的影响

Fig.9 The influence of temperature on seal performance

图10 偏心率对密封性能的影响

Fig.10 The influence of eccentricity on seal performance

图11 结构参数对气膜浮升力的影响规律

Fig.11 The influence of structural parameters on the floating force

图12 结构参数对质量泄漏率的影响规律

Fig.12 The influence of structural parameters on the mass leakage rate

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