Numerical investigation on leakage characteristics of labyrinth seal for cavitation flow in the liquid hydrogen piston pump

被引：0
作者：
Ren, Hongyu [1 ,2 ]
Wu, Wei [1 ,2 ]
Yang, Shaoqi [1 ]
Xie, Xiujuan [1 ]
机构：
[1] Chinese Acad Sci, Tech Inst Phys & Chem, Key Lab Cryogen Sci & Technol, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
CLEAN ENERGY | 2025年 / 9卷 / 01期
关键词：
labyrinth seal; cavitation flow; leakage characteristics; liquid hydrogen; piston pump; REFUELING STATIONS; PERFORMANCE; SIMULATION; FLUID;
D O I：
10.1093/ce/zkae104
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Based on the thermodynamically modified Zwart cavitation model, a two-dimensional theoretical cavitation flow model of the labyrinth seal between the piston and cylinder in a liquid hydrogen piston pump is established and verified. The influence of cavitation on the pressure distribution along the clearance seal, which reduces the leakage rate, is analyzed. The influence of input pressure and degree of subcooling on the cavitation flow is discussed. Higher inlet pressure and degree of subcooling can diminish the sealing effect between cavitation and liquid-phase flows. Furthermore, the leakage rates for clearance and labyrinth seals with 20- to 60-mu m sealing gap are compared. When the sealing gap is no less than 30 mu m, the labyrinth sealing effect is superior to clearance seal. Finally, the leakage rates of labyrinth seals with three cavity structures-square, curve, and triangle-are simulated. The sealing effects are ordered as follows: square labyrinth cavity, curved labyrinth cavity, and triangular labyrinth cavity. The sealing effect is preferred when the optimal length-to-width ratio of the square cavity is around 5.0. The studies are further helpful to decrease the leakage rate of labyrinth seals and enhance volumetric efficiency in liquid hydrogen piston pump. A two-dimensional theoretical cavitation flow model of the labyrinth seal between the piston and cylinder in a liquid hydrogen piston pump is established, based on the thermodynamically modified Zwart cavitation model. The influence of cavitation on the pressure distribution along the clearance seal is analyzed.
引用
收藏
页码：147 / 157
页数：11
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