涡轮泵用动静压型机械密封性能数值分析

孟祥铠; 肖远航; 赵文静; 江锦波; 彭旭东

doi:10.13224/j.cnki.jasp.20220580

涡轮泵用动静压型机械密封性能数值分析

doi: 10.13224/j.cnki.jasp.20220580

浙江工业大学化工过程机械研究所，杭州 310032

基金项目: 国家自然科学基金（52175193）

详细信息

作者简介:
孟祥铠（1980-），男，教授、博士生导师，博士，主要从事流体密封技术的研究

中图分类号: V231；TH117.2
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- 文章访问数: 59
- HTML浏览量: 32
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- 被引次数: 0
出版历程
- 收稿日期: 2022-08-09
- 网络出版日期: 2023-10-27

Numerical analysis on performance of hydrodynamic-hydrostatic hybrid mechanical seals for turbopumps

Institute of Chemical Process Machinery， Zhejiang University of Technology，Hangzhou 310032，China

摘要

摘要:
针对密封端面液氧的低动力黏度难以成膜的特性，提出一种动静压结合型机械端面密封。考虑节流孔的静压效应和液膜空化效应，建立了液膜的有限元分析模型，研究了动静压型机械密封的工作原理，分析了端面动静压结构几何参数对密封性能的影响规律。研究结果表明：动静压型机械密封的节流孔将静压效应引入密封端面，螺旋槽在提高液膜动压效应基础上将经节流孔流入的介质泵送回密封腔，提高了上游泵送量。在研究范围内，推荐的动静压结构几何参数的优选范围如下：螺旋槽槽台宽比为0.6～0.7、槽坝比为0.6～0.7、槽深为12～15 μm、螺旋角为15°～18°，静压节流孔孔径为0.4～0.5 mm、节流孔个数为6～12 个。
- 动静压型机械密封 /
- 液氧 /
- 有限单元法 /
- 节流孔 /
- 涡轮泵
Abstract:
In view of the characteristics of low dynamic viscosity and hard film forming of liquid oxygen on the sealing face, a hydrodynamic-hydrostatic hybrid mechanical seal was proposed. Considering the hydrostatic effect of the orifice and the cavitation effect of the liquid film, the finite element analysis model of the liquid film was established to study the working principle of the hydrodynamic-hydrostatic hybrid mechanical seal and analyze the influences of the geometrical parameters of the hydrodynamic and hydrostatic structure on the sealing performance. Within the research scope, the optimum range of the geometrical parameters of the spiral groove and hydrostatic structure was as follows: the groove-weir ratio was 0.6—0.7, the groove-dam ratio was 0.6—0.7, the groove depth was 12—15 μm, the spiral angle was 15°—18°, the orifice diameter was 0.4—0.5 mm, and the orifice number was 6—12.
- hydrodynamic-hydrostatic hybrid mechanical seal /
- liquid oxygen /
- finite element method /
- orifice /
- turbopump

HTML

图 1 HDS-MS几何模型

Figure 1. Geometric model of HDS-MS

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图 2 模型验证

Figure 2. Model validation

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图 3 HD-MS和HDS-MS的密封液膜流场

Figure 3. Lubrication film flow field of HD-MS and HDS-MS

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图 4 槽台宽比的影响

Figure 4. Influence of β₁

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图 5 槽坝比的影响

Figure 5. Influence of β₂

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图 6 槽深的影响

Figure 6. Influence of h_g

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图 7 螺旋角的影响

Figure 7. Influence of α

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图 8 槽底半径比的影响

Figure 8. Influence of β₃

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图 9 节流孔孔径的影响

Figure 9. Influence of d_k

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图 10 节流孔孔数的影响

Figure 10. Influence of m

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图 11 均压槽槽宽的影响

Figure 11. Influence of w_j

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表 1 几何参数与工况参数

Table 1. Geometrical parameters and operating parameters

参数	数值	参数	数值
端面外径 r_o/mm	55.5	螺旋槽槽数N_g	15
端面内径 r_i/mm	45.5	节流孔孔径d_k/mm	0.5
螺旋槽槽台宽比β₁	0.5	均压槽槽宽w_j/mm	1.5
螺旋槽槽坝比β₂	0.7	均压槽槽深h_j/μm	200
螺旋槽槽底半径比β₃	0.4	节流孔孔数m	15
螺旋角α/（°）	15	转速 n/10⁴ （r/min）	2
螺旋槽槽深h_g/μm	5	外径侧压力p_o/MPa	0.5
密封间隙h_c/μm	5	内径侧压力p_i/MPa	0.1

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