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作 者:李双喜[1] 刘安 刘志远 张江腾 李世聪 LI Shuangxi;LIU An;LIU Zhiyuan;ZHANG Jiangteng;LI Shicong(College of Electromechanical Engineering,Beijing University of Chemical Technology,Beijing 100029,China)
出 处:《化工学报》2025年第1期311-323,共13页CIESC Journal
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。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 highfrequency 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
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