化工进展2026，Vol.45Issue(7)：3871-3884,14.DOI:10.16085/j.issn.1000-6613.2025-1127
基于阻塞流动调控以提载控漏的超临界CO2干气密封螺旋槽参数
Parametric analysis of spiral groove in supercritical CO2 dry gas seal based on choked flow regulation for load enhancement and leakage control
摘要
Abstract
In order to solve the common problem of simultaneous increase in opening force and leakage rate in the optimal design of spiral groove dry gas seals,this study proposed regulating spiral groove parameters to induce choked flow at the exit of sealing end faces,thereby achieving end face leakage control while enhancing gas film load-carrying capacity.This paper used the finite difference method to solve the pressure and temperature governing equations,analyzing the impacts of thermal effects and turbulent effects on the critical choked spiral groove parameters of supercritical CO₂ dry gas seals under various operating conditions,and the design range of critical choked instability film thickness under different structural parameters.The results showed that increasing spiral groove parameters(groove depth,groove-dam ratio,groove-land ratio,spiral angle)enabled the seal clearance exit velocity to reach the local sonic speed at ambient exit pressure.In laminar-isothermal model,increasing rotational speed reduced the critical choked groove depth,groove-dam ratio,and spiral angle.However,in turbulent-adiabatic models,higher rotational speeds corresponded to larger critical choked spiral groove parameters.Increasing inlet pressure reduced critical choked spiral groove parameters.Turbulent and adiabatic effects exhibited a certain synergistic effect,delaying the occurrence of critical choking and featuring wider design intervals for the critical choked instability film thickness.关键词
干气密封/超临界二氧化碳/数值分析/湍流/临界阻塞/结构参数Key words
dry gas seal/supercritical carbon dioxide/numerical analysis/turbulent flow/critical choke/structural parameters分类
机械制造引用本文复制引用
罗屹潇,陈维,许恒杰,毛文元,陈飞,邓强国,孙雪剑..基于阻塞流动调控以提载控漏的超临界CO2干气密封螺旋槽参数[J].化工进展,2026,45(7):3871-3884,14.基金项目
国家自然科学基金(52105189) （52105189）
云南省基础研究计划(202401AT070402,202401AT070404). （202401AT070402,202401AT070404）
