Analysis of Microtexture Variables in T-shaped Grooves of Dry Gas Seals with Horizontal and Vertical Ordered Microtexture Design

doi:10.12422/j.issn.1672-6952.2024.03.010

Abstract

Abstract:

To investigate the influence of ordered micro texture design on the dynamic pressure effect of dry gas seal T‐groove, based on the principle of gas film lubrication, finite difference method was used to study the effects of ordered micro texture variables such as micro texture arrangement spacing, micro texture length, T‐shaped groove base length and width, and micro texture gradient inclination angle on sealing parameters. The design variables of four types of micro textures were compared. The results show that the micro texture of the T‐shaped groove can change the dynamic pressure effect of the groove itself, just like the structural parameters of the T‐shaped groove, but it does not change the dynamic law of the dry gas seal groove itself. The influence of microtexture variables on the opening force of T-shaped grooves in dry gas seals: microtexture gradient inclination angle>microtexture arrangement spacing>microtexture length and width>T-shaped groove base length and width amplification; The impact on leakage rate: microtexture length and width>microtexture arrangement spacing>T-shaped groove base length and width amplification>microtexture gradient inclination angle. The research results have certain reference value for the optimization and design of bi‐directional rotating end face gas film seals.

Key words: Dry gas seal, Bidirectional rotating T-shaped groove, Finite difference method, Ordered micro texture design, Sealing performance

摘要：

为探究有序微纹理设计对干气密封T型槽动压效果的影响，基于气膜润滑原理，采用有限差分法，研究了微纹理排列间距、微纹理长度、T型槽基底长宽增幅、微纹理梯度倾斜角度等有序微纹理变量对密封参数的影响，并对四种微纹理的设计变量进行了对比。结果表明，T型槽的微纹理变量与T型槽的结构参数一样能改变槽的动压效应，但不改变干气密封槽型的动力学规律；微纹理变量对干气密封T型槽开启力的影响按微纹理梯度倾斜角度＞微纹理排列间距＞微纹理长宽＞T型槽基底长宽增幅的顺序减小；对泄漏量的影响按微纹理长宽＞微纹理排列间距＞T型槽基底长宽增幅＞微纹理梯度倾斜角度的顺序减小。研究结果对双向旋转式端面气膜密封的优化和设计具有一定的借鉴作用。

关键词: 干气密封, 双向旋转式T型槽, 有限差分法, 有序微纹理设计, 密封性能

CLC Number:

TX136

Jingmo WANG, Rende WU, Changsheng MU, Wenshu CUI, Heyi DING, Hongwei SUN. Analysis of Microtexture Variables in T-shaped Grooves of Dry Gas Seals with Horizontal and Vertical Ordered Microtexture Design[J]. Journal of Liaoning Petrochemical University, 2024, 44(3): 70-79.

王竞墨, 吴仁德, 穆长生, 崔文姝, 丁赫艺, 孙宏伟. 横纵有序微纹理设计的干气密封T型槽微纹理变量分析[J]. 辽宁石油化工大学学报, 2024, 44(3): 70-79.

Figures/Tables 15

Fig.1 Schematic diagram of T-shaped groove and sealing ring structure for dry gas sealing

Fig.2 Three dimensional structural diagram of dry gas sealed T-groove

Fig.3 The calculation process of this article

Fig.4 Nodes, control bodies, and grid settings in cartesian coordinates

Table 1 The influence of grid number on opening force, leakage rate, and calculation time

网格数	开启力/N	泄漏量/（kg·s^－1）	计算所用时间/s	网格数	开启力/N	泄漏量/（kg·s^－1）	计算所用时间/s
30×30	5 926.7	0.021 00	17	80×80	5 934.3	0.019 68	333
40×40	5 930.0	0.020 55	46	90×90	5 935.0	0.019 65	375
50×50	5 931.0	0.020 15	164	100×100	5 935.8	0.019 60	425
60×60	5 932.5	0.019 95	212	110×110	5 936.1	0.019 51	475
70×70	5 933.3	0.019 86	245	120×120	5 936.3	0.019 49	1 680

Fig.5 Comparison of calculated opening force values for dry gas sealed T-shaped grooves without micro textures under different gas film thicknesses

Fig.6 Gas film thickness and pressure distribution map of single cycle T-shaped grooves with or without micro textures

Fig.7 Schematic diagram of air film with different spacing of micro texture arrangement

Table 2 The variation of opening force and leakage rate with the spacing of micro texture arrangement

微纹理排列间距	开启力/N	泄漏量×10⁶/（kg·s^－1）
0.1	9 622.4	1.51
0.2	9 711.8	1.59
0.3	9 753.1	1.64
0.4	9 776.0	1.66
0.5	9 801.0	1.69

Fig.8 Schematic diagram of air film with different length and width of microtextures

Table 3 The variation of opening force and leakage rate with the length and width of microtextures

长度×宽度	开启力/N	泄漏量×10⁶/（kg·s^－1）
0.8×0.8	9 622.4	1.51
0.6×0.6	9 505.3	1.44
0.5×0.5	9 416.6	1.38
0.4×0.4	9 356.3	1.33
0.2×0.2	9 317.8	1.28

Fig.9 Schematic diagram of gas film comparison with different length and width amplitudes of T-shaped groove substrate

Table 4 The variation of opening force and leakage rate with the increase in the length and width of the T-groove base

T型槽基底长宽增幅	开启力/N	泄漏量×10⁶/（kg·s^－1）
1+1	9 772.5	1.62
3+3	9 763.9	1.71
6+6	9 712.3	1.83
9+9	9 625.4	1.96
12+12	9 508.0	2.06

Fig.10 Schematic diagram of gas film with different inclination angles of ordered microtexture gradients

Table 5 The variation of opening force and leakage rate with the inclination angle of micro texture gradient

倾斜角度/（°）	开启力/N		泄漏量×10⁶/（kg·s^－1）
倾斜角度/（°）	Type1	Type2	Type1	Type2
15	10 112.0	10 023.0	2.56	2.73
20	10 243.2	10 127.0	2.64	2.82
25	10 379.3	10 263.0	2.71	2.91
30	10 480.6	10 412.5	2.78	3.00
35	10 610.6	10 490.0	2.86	3.09

References 27

1	ETSION I，KLIGERMAN Y，HALPERIN G.Analytical and experimental investigationof laser-textured mechanical seal faces［J］.Tribology Transactions，1999，42（3）：511-516.
2	ETSION I.Improving tribological performance of mechanical seals by laser surface texturing［C］//Proceedings of the 17th International Pump Users Symposium.College Station，TX：Texas A&M University，2000：17-21.
3	ETSION I.State of the art in laser surface texturing［J］.Journal of Tribology，2005，127（1）：248-253.
4	ANDERSSON P，KOSKINEN J，VARJUS S，et al.Microlubrication effect by laser-textured steel surfaces［J］.Wear，2007，262（3-4）：369-379.
5	HAMILTON D B，WALOWIT J A，ALLEN C M.A theory of lubrication by microirregularities［J］.Journal of Basic Engineering，1966，88（1）：177-185.
6	任晓，吴承伟，周平.粗糙表面的气体密封性能研究［J］.机械工程学报，2010，46（16）：176-181.
	REN X，WU C W，ZHOU P.Gas sealing performance study of rough surface［J］.Journal of Mechanical Engineering，2010，46（16）：176-181.
7	BLASIAK S，ZAHORULKO A V.A parametric and dynamic analysis of non-contacting gas face seals with modified surfaces［J］.Tribology International，2016，94：126-137.
8	MA C B，SUN J J，WANG Y，et al.On the optimum dimple depth-over-diameter ratio for textured surfaces［J］.Advances in Mechanical Engineering，2017，9（9）：1-8.
9	曹志康.微纹理表面改性对液膜密封空化特性的影响研究［D］.连云港：江苏海洋大学，2022.
10	FALALEEV S V，BONDARCHUK P V，TISAREV A Y.Development of advanced carbon face seals for aircraft engines［J］.IOP Conference Series：Materials Science and Engineering，2018，302（1）：012004.
11	于新奇，彭培英，王振辉，等.激光加工多孔密封端面的摩擦性能试验研究［J］.润滑与密封，2006（8）：34-37.
	YU X Q，PENG P Y，WANG Z H，et al.Test research on friction performance of the laser-textured porous seal face［J］. Lubrication Engineering，2006（8）：34-37.
12	彭旭东，杜东波，盛颂恩，等.端面微形体对液体润滑机械密封性能的影响［J］. 摩擦学学报，2007，27（4）：352-356.
	PENG X D，DU D B，SHENG S E，et al.Effect of face asperity geometry on performance of a liquid lubricated face seal［J］. Tribology，2007，27（4）：352-356.
13	佘宝瑛，彭旭东，孟祥铠，等.不同形状方向性型孔液体润滑端面密封性能对比［J］.化工学报，2014，65（6）：2202-2210.
	SHE B Y，PENG X D，MENG X K，et al.Comparison on seal performance of liquid-lubricated end face seals with different shapes inclined dimples［J］.CIESC Journal，2014，65（6）：2202-2210.
14	魏伟，陈思，章亦聪，等.三角形-椭圆复合微孔织构化机械端面密封性能的数值研究［J］.流体机械，2020，48（8）：25-31.
	WEI W，CHEN S，ZHANG Y C，et al.Numerical study on the sealing performance textured with multi-shape texture pattern combined with triangular and elliptical dimples［J］.Fluid Machinery，2020，48（8）：25-31.
15	刘鑫，彭旭东，孟祥铠，等.斜排微孔端面机械密封富集效应的理论研究［J］.化工学报，2010，61（2）：444-449.
	LIU X，PENG X D，MENG X K，et al.Theoretical study of collective effect of laser surface textured mechanical seal with oblique distributed pore face［J］.CIESC Journal，2010，61（2）：444-449.
16	李媛，刘小君，张彦，等.面接触条件下织构表面摩擦特性研究［J］.机械工程学报，2012，48（19）：109-115.
	LI Y，LIU X J，ZHANG Y，et al.Frictional properties of textured surfaces under plane contact［J］.Journal of Mechanical Engineering，2012，48（19）：109-115.
17	丁行武，王家序，郭胤，等.基于滑动摩擦的摩擦副表面织构优化分析［J］.四川大学学报（工程科学版），2013，45（S1）： 183-188.
	DING H W，WANG J X，GUO Y，et al.Optimization analysis of the surface texture of friction pair based on sliding friction［J］.Journal of Sichuan University（Engineering Science Edition），2013，45（S1）：183-188.
18	徐鲁帅，王赟磊，张帆，等.扰变工况下不同表面结构机械密封瞬态特性分析［J］.西安交通大学学报，2020，54（1）：56-63.
	XU L S，WANG Y L，ZHANG F，et al.Transient characteristics of mechanical seals with different surface structures under disturbance conditions［J］.Journal of Xi'an Jiaotong University，2020，54（1）：56-63.
19	方勋，严志军，王剑豪，等.考虑空化效应的表面微凸体织构摩擦副润滑性能研究［J］.润滑与密封，2020，45（12）：32-41.
	FANG X，YAN Z J，WANG J H，et al.Effect of micro-convex texture on lubrication performance of friction pair considering cavitation phenomenon［J］.Lubrication Engineering，2020，45（12）：32-41.
20	王衍，孙见君，胡琼，等.基于微尺度造型的干气密封流动有序性数值分析［J］.摩擦学学报，2018，38（6）：673-683.
	WANG Y，SUN J J，HU Q，et al.Numerical analysis of dry gas seal flow orderliness based on microstructure modeling［J］.Tribology，2018，38（6）：673-683.
21	WANG Y，SUN J J，HU Q，et al.Orientation effect of orderly roughness microstructure on spiral groove dry gas seal［J］.Tribology International，2018，126：97-105.
22	陈文杰，孟祥铠，王玉明，等.机械密封织构化表面粗糙度效应的有限元模型与摩擦学特性分析［J］.摩擦学学报，2019，39（5）：523-531.
	CHEN W J，MENG X K，WANG Y M，et al.Finite element model and tribological properties analysis of textured mechanical seals considering roughness effect［J］.Tribology，2019，39（5）：523-531.
23	严如奇，丁雪兴，徐洁，等.离心惯性力效应对超临界二氧化碳干气密封流场与密封特性影响分析［J］.摩擦学学报，2020，40（6）：781-791.
	YAN R Q，DING X X，XU J，et al.The influence analysis of centrifugal inertia force effect on the flow field and sealing characteristics of supercritical carbon dioxide dry gas seal［J］.Tribology，2020，40（6）：781-791.
24	商浩，陈源，李孝禄，等.膜厚扰动下的非线性效应对干气密封性能影响研究［J］.化工学报，2021，72（4）：2213-2222.
	SHANG H，CHEN Y，LI X L，et al.Study on the influence of nonlinear effect on performance of dry gas seal under film thickness disturbance［J］.CIESC Journal，2021，72（4）：2213-2222.
25	张伟政，赵吉军，张献中，等.新型螺旋槽干气密封流固耦合分析［J］.润滑与密封，2022，47（9）：1-10.
	ZHANG W Z，ZHAO J J，ZHANG X Z，et al.Fluid-structure coupling analysis of a new spiral groove dry gas seal［J］.Lubrication Engineering，2022，47（9）：1-10.
26	王朝亚，唐大全，赵春林，等.高参数上游泵送机械密封性能计算与分析研究［J］.润滑与密封，2021，46（9）：82-90.
	WANG C Y，TANG D Q，ZHAO C L，et al.Performance calculation and analysis of high-parameter upstream pumping mechanical seals［J］.Lubrication Engineering，2021，46（9）：82-90.
27	王竞墨，丁雪兴，王世鹏，等.干气密封T型槽底部微纹理织构性能研究［J］.润滑与密封，2023，48（9）：99-107.
	WANG J M，DING X X，WANG S P，et al.Study on dry gas sealing performance of T-groove based on ordered micro texture modeling design［J］.Lubrication Engineering，2023，48（9）：99-107.

[1]	Liu Hailong, Wu Shuhong. Numerical Simulation of Fluid Flow in Low PermeabilityReservoir Using Finite Difference Method [J]. Journal of Liaoning Petrochemical University, 2016, 36(4): 38-42.
[2]	ZHU Danmei, HUANG Chunyu. An American Option Pricing Method Based on Parallel Computing [J]. Journal of Liaoning Petrochemical University, 2013, 33(2): 85-87.
[3]	XU Dan， SHEN Long-she， DU Ming-jun， CHEN Zhong-hua. Numerical Simulation of Three-Dimensional Unsteady-State Heat Transfer for Buried Hot Oil Pipeline at Shutdown [J]. Journal of Liaoning Petrochemical University, 2010, 30(4): 47-50.