Disturbance performance of dynamic and static pressure hybrid gas isolation seal of high-speed turbopumps

doi:10.11949/0438-1157.20240760

Abstract

Abstract:

The isolation seal is extremely important for high speed turbine pump fuel seals, but it has problems such as gas supply pressure fluctuations and strong external vibration at work, which will seriously affect the sealing performance. Any compromise in these areas could have a detrimental impact on the sealing performance. Accordingly, the conditions for disturbance of the dynamic and static pressure isolation seal gas membrane have been established on the basis of a finite element numerical analysis. A dynamic change of disturbance analysis model has been constructed by using Fluent dynamic mesh technology and MATLAB to solve the end face gas membrane disturbance stiffness and disturbance damping. This has been compared with the static pressure and dynamic and static pressure. The mixed gas isolation seal disturbance performance has been discussed in terms of the gas membrane thickness, working pressure and disturbance amplitude, and other parameters. The influence of the gas film thickness and perturbation amplitude on the perturbation performance has been investigated, and a rule of change has been established. Finally, the anti-perturbation performance of dynamic and static pressure seals has been tested and verified. The results indicate that an increase in perturbation frequency leads to a decrease in overall perturbation stiffness, which then increases. Additionally, perturbation damping decreases rapidly with the increase in perturbation frequency, reaching a stable value between 10 Hz and 100 Hz. The supply pressure of gas is found to be positively correlated with both the stiffness and damping of the perturbation. As the speed increases, the stiffness of the perturbation increases in the low-frequency band and decreases in the middle and high-frequency bands. The damping decreases across the entire frequency spectrum. As the perturbation amplitude is increased, the perturbation stiffness remains almost unchanged in the middle and low frequency bands, while it decreases in the high frequency band. The perturbation damping increases slightly, while the working film thickness is negatively correlated with the perturbation stiffness and the perturbation damping. Hybrid dynamic and static pressure seals effectively improve the stability of the sealing device in low frequency, avoiding the problem of insufficient anti-disturbance ability when the seal is in low pressure and low speed.

Key words: isolating seal, gas, dynamic and static pressure, perturbation stiffness, perturbation damping

摘要：

隔离密封对高速涡轮泵燃料密封极为重要，但其在工作时存在供气压力波动、外界振动强烈等问题，会严重影响密封性能。对动静压隔离密封气膜扰动工况，基于有限元数值分析方法建立了动态变化扰动分析模型，采用Fluent动网格技术和MATLAB求解端面气膜扰动刚度及扰动阻尼，对比静压式与动静压混合式气体隔离密封的扰动性能，讨论气膜厚度、工作压力及扰动幅值等参数对扰动性能的影响，得到其变化规律，并试验验证了动静压密封的抗扰动性能。结果表明：扰动频率的增加使得扰动刚度整体呈现先减小后增大的趋势，扰动阻尼随扰动频率的增加迅速降低，在10~100 Hz时逐渐趋于平稳。供气压力与扰动刚度、扰动阻尼呈正相关。工作转速增大，扰动刚度在低频段增大、在中高频段减小，扰动阻尼全频减小。扰动幅值增大，扰动刚度在中低频段几乎不变、在高频段减小，扰动阻尼略有增大。工作膜厚与扰动刚度、扰动阻尼呈负相关。动静压式混合密封有效提升了密封装置中低频下的稳定性能，避免了密封处于低压、低转速时抗扰动能力不足的问题。

关键词: 隔离密封, 气体, 动静压, 扰动刚度, 扰动阻尼

CLC Number:

TB 42

Shuangxi LI, An LIU, Zhiyuan LIU, Jiangteng ZHANG, Shicong LI. Disturbance performance of dynamic and static pressure hybrid gas isolation seal of high-speed turbopumps[J]. CIESC Journal, 2025, 76(1): 311-323.

李双喜, 刘安, 刘志远, 张江腾, 李世聪. 高速涡轮泵动静压混合式气体隔离密封扰动性能[J]. 化工学报, 2025, 76(1): 311-323.

Figures/Tables 21

Fig.1 Schematic diagram of dynamic-hydrostatic hybrid seal

Fig.2 Dimensional drawing of seal structure

Table 1 Static ring end face structure parameters

参数	数值	参数	数值
内侧槽槽根径d₁/mm	57	稳压槽内径d₄/mm	71
外侧槽槽根径d₂/mm	91	稳压槽外径d₅/mm	77
节流孔直径d_g/mm	0.2	稳压槽深度H₁/mm	0.2
节流孔个数N₁	8	稳压槽中心圆直径d₃/mm	74

Table 2 Structural parameters of groove

参数	数值
螺旋角α/(°)	15
槽深 H_g/μm	8
槽堰比 γ	0.5
槽坝比 β	0.7
槽数 N_g	2×8

Table 3 Dynamic-hydrostatic hybrid seal assembly structure parameters

参数	数值	参数	数值
动环内径d₆/mm	40	静环内径d₈/mm	51
动环外径d₇/mm	97	静环外径d₉/mm	97
动环厚度B₁/mm	13	静环厚度B₂/mm	22.5

Fig.3 Geometric model of dynamic-hydrostatic hybrid seal

Fig.4 Disturbance performance solution flow

Fig.5 Validation of simulation model

Fig.6 Variation of air film pressure field distribution for one perturbation cycle

Fig.7 Change curve of bearing capacity under different disturbance frequencies

Fig.8 Phase difference between displacement and bearing capacity function

Fig.9 Disturbance stiffness and damping at different disturbance frequencies

Fig.10 Comparison of sealing forms

Fig.11 Comparison results of perturbation stiffness and perturbation damping of two kinds of seals

Fig.12 Variation of perturbation stiffness and perturbation damping versus supply pressure

Fig.13 Variation of perturbation stiffness and perturbation damping versus film thickness

Fig.14 Variation of disturbance stiffness and disturbance damping versus operating speed

Fig.15 Variation of disturbance stiffness and disturbance damping versus disturbance amplitude

Fig.16 Test system principle

Fig.17 Surface morphology of static ring

Fig. 18 Film thickness control test results

References 32

1	李世聪, 钱才富, 李双喜, 等. 油气两相动压密封动态特性的热流固耦合研究[J]. 化工学报, 2020, 71(5): 2190-2201.
	Li S C, Qian C F, Li S X, et al. Study of thermal-fluid-solid coupling on dynamic characteristics of oil-gas miscible backflow pumping seal[J]. CIESC Journal, 2020, 71(5): 2190-2201.
2	郑娆, 胡鼎国, 刘志远, 等. 变工况下静压氦隔离密封的密封性能分析 [J]. 化工进展, DOI:10.16085/j.issn.1000-6613.2024-0207 .
	Zheng R, Hu D G, Liu Z Y, et al. Sealing performance analysis of hydrostatic helium isolation seals under variable operating conditions [J]. Chemical Industry and Engineering Progress, DOI:10.16085/j.issn.1000-6613.2024-0207 .
3	俞树荣, 丁俊华, 王世鹏, 等. 柱面密封气膜动压效应模拟及试验[J]. 化工学报, 2020, 71(7): 3220-3228.
	Yu S R, Ding J H, Wang S P, et al. Simulation and analysis of dynamic pressure effect of gas film on cylinder seal[J]. CIESC Journal, 2020, 71(7): 3220-3228.
4	Sun J J, Ma C B, Yu Q P, et al. Numerical analysis on a new pump-out hydrodynamic mechanical seal[J]. Tribology International, 2017, 106: 62-70.
5	李涛子, 张秋翔, 蔡纪宁, 等. T型槽干气密封稳态特性的有限元分析[J]. 北京化工大学学报(自然科学版), 2003, 30(2): 58-62.
	Li T Z, Zhang Q X, Cai J N, et al. Steady-state performance analysis of T-shape groove dry gas seals by a finite element method[J]. Journal of Beijing University of Chemical Technology (Natural Science Edition), 2003, 30(2): 58-62.
6	徐奇超, 江锦波, 彭旭东, 等. 基于遗传算法的干气密封双向槽统一模型与参数优化[J]. 化工学报, 2019, 70(3): 995-1005.
	Xu Q C, Jiang J B, Peng X D, et al. Unified model and geometrical optimization of bi-directional groove of dry gas seal based on genetic algorithm[J]. CIESC Journal, 2019, 70(3): 995-1005.
7	许晓东, 马晨波, 孙见君, 等. 基于最优传质系数的槽型结构参数对液膜机械密封汽化特性影响及优化[J]. 化工学报, 2022, 73(3): 1147-1156.
	Xu X D, Ma C B, Sun J J, et al. Influence and optimization of groove structure parameters on vaporization characteristics of liquid film mechanical seals based on optimal mass transfer coefficient[J]. CIESC Journal, 2022, 73(3): 1147-1156.
8	华绍杰, 何豫鹏, 郭红, 等. 圆柱浮环液体动静压轴承止推环性能的有限元分析[J]. 机械设计, 1998, 15(8): 18-20.
	Hua S J, He Y P, Guo H, et al. Finite element analysis of thrust ring performance of cylindrical floating ring liquid hydrostatic bearing [J]. Journal of Machine Design, 1998, 15(8): 18-20.
9	王东强, 于贺春, 王广洲, 等. 动静压气体轴承的结构参数设计[J]. 液压与气动, 2019(6): 29-34.
	Wang D Q, Yu H C, Wang G Z, et al. Structural parameters design of hybrid journal bearings[J]. Chinese Hydraulics & Pneumatics, 2019(6): 29-34.
10	王玉明, 刘伟, 刘莹. 非接触式机械密封基础研究现状与展望[J]. 液压气动与密封, 2011, 31(2): 29-33.
	Wang Y M, Liu W, Liu Y. Current research and developing trends on non-contacting mechanical seals[J]. Hydraulics Pneumatics & Seals, 2011, 31(2): 29-33.
11	陈群, 孙见君. 自泵送流体动静压型机械密封自清洁性分析[J]. 摩擦学学报, 2019, 39(3): 259-268.
	Chen Q, Sun J J. Analysis of self-cleaning for self-pumping hydrodynamic and hydrostatic mechanical seal[J]. Tribology, 2019, 39(3): 259-268.
12	孟祥铠, 肖远航, 赵文静, 等. 涡轮泵用动静压结合型机械密封性能数值分析[J]. 航空动力学报, 2024, 39(8): 428-439.
	Meng X K, Xiao Y H, Zhao W J, et al. Numerical analysis of the performance of combined dynamic and static mechanical seals for turbopumps [J]. Journal of Aerospace Dynamics, 2024, 39(8): 428-439.
13	王建磊, 门川皓, 赵伟刚, 等. 动静压机械密封的结构设计及端面槽型优化研究[J]. 机械工程学报, 2021, 57(9): 108-117.
	Wang J L, Men C H, Zhao W G, et al. Research on structural design and end face slot of optimization of hydrodynamic and hydrostatic mechanical seal[J]. Journal of Mechanical Engineering, 2021, 57(9): 108-117.
14	葛诚, 孙见君, 苏徐辰, 等. 扩压式自泵送流体动静压型机械密封性能分析[J]. 化工学报, 2020, 71(5): 2202-2214.
	Ge C, Sun J J, Su X C, et al. Performance analysis on diffuser self-pumping hydrodynamic and hydrostatic mechanical seal[J]. CIESC Journal, 2020, 71(5): 2202-2214.
15	王琳娜. 扩压式自泵送流体动静压机械密封参数化建模及其结构设计[D]. 南京: 南京林业大学, 2023.
	Wang L N. Parametric modeling and structural design of dynamic and static mechanical seal for self-pumping fluid with diffusion type[D]. Nanjing: Nanjing Forestry University, 2023.
16	李双喜, 张树强, 蔡纪宁, 等. 动静压混合式气体密封的特性分析[J]. 摩擦学学报, 2011, 31(5): 457-466.
	Li S X, Zhang S Q, Cai J N, et al. Performance study of dynamic-hydrostatic hybrid gas seal[J]. Tribology, 2011, 31(5): 457-466.
17	赵伟刚, 张树强, 陈杰, 等. 液氧泵用动静压混合式密封关键技术研究[J]. 润滑与密封, 2017, 42(1): 111-115, 136.
	Zhao W G, Zhang S Q, Chen J, et al. Key technologies of dynamic-hydrostatic hybrid seals used in liquid oxygen pump[J]. Lubrication Engineering, 2017, 42(1): 111-115, 136.
18	Brunetière N, Rouillon M. Fluid flow regime transition in water lubricated spiral grooved face seals[J]. Tribology International, 2021, 153: 106605.
19	Kou G Y, Li X H, Wang Y, et al. Steady performance and dynamic characteristics of a superellipse groove dry gas seal at a high-speed condition[J]. Industrial Lubrication and Tribology, 2020, 72(6): 789-796.
20	Li Y, Song P Y, Xu H J. Performance analyses of the spiral groove dry gas seal with inner annular groove[J]. Applied Mechanics and Materials, 2013, 420: 51-55.
21	刘蕴, 董冠华, 殷国富. 非接触密封失稳振动分析与结构优化[J]. 浙江大学学报 (工学版), 2018, 52(7): 1390-1397.
	Liu Y, Dong G H, Yin G F. Vibration analysis and structural optimization of non-contact seal[J]. Journal of Zhejiang University (Engineering Science), 2018, 52(7): 1390-1397.
22	李晓晖. 流体动压型机械密封端面状态监测及健康评估[D]. 成都: 西南交通大学, 2016.
	Li X H. Condition monitoring and health assessment of end face of hydrodynamic mechanical seal[D]. Chengdu: Southwest Jiaotong University, 2016.
23	杨志军, 郝木明. 基于LabVIEW的机械密封端面信息采集与分析系统[J]. 机械设计与制造, 2009(3): 192-194.
	Yang Z J, Hao M M. Acquisition and analysis system of the face information of mechanical seal face based on LabVIEW[J]. Machinery Design & Manufacture, 2009(3): 192-194.
24	Qiu Y F, Khonsari M M. Thermohydrodynamic analysis of spiral groove mechanical face seal for liquid applications[J]. Journal of Tribology, 2012, 134(2): 1.
25	Du Q W, Gao K K, Zhang D, et al. Effects of grooved ring rotation and working fluid on the performance of dry gas seal[J]. International Journal of Heat and Mass Transfer, 2018, 126: 1323-1332.
26	陈国忠. 气液混合两相流的动静压密封性能分析[D]. 西安: 西安电子科技大学, 2018.
	Chen G Z. Performance analysis of dynamic and static pressure seal for gas-liquid mixed two-phase flow[D]. Xi'an: Xidian University, 2018.
27	宋子锋. 高速涡轮泵静压式隔离密封气膜润滑机理与密封性能研究[D]. 北京: 北京化工大学, 2023.
	Song Z F. Study on gas film lubrication mechanism and sealing performance of static pressure isolation seal for high-speed turbopump[D]. Beijing: Beijing University of Chemical Technology, 2023.
28	闫欣欣, 郑娆, 李双喜, 等. 可控型静压气体密封结构参数对密封性能的影响实验研究[J]. 机电工程, 2023, 40(10): 1483-1492.
	Yan X X, Zheng R, Li S X, et al. Experimental study on influence of structural parameters on performance of controllable static pressure dry gas seal[J]. Journal of Mechanical & Electrical Engineering, 2023, 40(10): 1483-1492.
29	张念东. 多孔质节流气体静压轴承静动特性分析及实验研究[D]. 哈尔滨: 哈尔滨工业大学, 2022.
	Zhang N D. Analysis and experimental study on static and dynamic characteristics of porous throttle aerostatic bearing[D]. Harbin: Harbin Institute of Technology, 2022.
30	何林山. 多孔质气体静压轴承工作条件下动态特性及稳定域分析[D]. 成都: 电子科技大学, 2019.
	He L S. Dynamic characteristics and stability region analysis of porous gas hydrostatic bearing under working conditions[D]. Chengdu: University of Electronic Science and Technology of China, 2019.
31	鲍建桥, 郭红, 石明辉. 基于FLUENT动网格的动压轴承特性改进算法[J]. 现代制造工程, 2022 (7): 104-107, 82.
	Bao J Q, Guo H, Shi M H. Improved algorithm of the hydrodynamic bearing based on FLUENT dynamic mesh[J]. Modern Manufacturing Engineering, 2022 (7): 104-107, 82.
32	张雪贝, 王驰, 陈红丽. 基于FLUENT的UDS和UDF功能的中子扩散耦合计算研究与快堆应用分析[J]. 四川大学学报 (自然科学版), 2020, 57(2): 324-332.
	Zhang X B, Wang C, Chen H L. Research on neutron diffusion coupling calculation based on the UDS and UDF functions of FLUENT and its application analysis on fast reactor[J]. Journal of Sichuan University (Natural Science Edition), 2020, 57(2): 324-332.

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