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某新型燃气弹射传动活塞密封设计与分析
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国家自然科学基金项目 (51303081); 江苏省自然 科学基金项目 (bk20170837).


Seal Design and Analysis of a New Gas Ejector Drive Piston
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    摘要:

    传动活塞的密封性能对燃气弹射装置的正常工作有着重要影响。为保证和提高燃气弹射的可靠性,设计了一种组合/复合密封,并分析该密封的工作原理;理论分析密封的泄漏模型和密封的失效准则,推导二维N-S控制方程,给出复合密封的可靠性数学模型、k-ε湍流方程、超弹性橡胶本构模型;采用有限元仿真的方法讨论密封泄漏的压力变化、密封的受力情况。结果表明:燃气泄漏后其压力随密封位置而呈阶梯形下降,密封圈受到的最大接触应力和等效应力总大于燃气的工作压力,剪切应力总小于密封圈的抗剪切强度,满足密封失效准则,能作为一种燃气弹射传动活塞的密封结构。

    Abstract:

    The sealing performance of the drive piston has an important influence on the normal operation of the gas ejector.In order to ensure and improve the reliability of gas ejection,a combined/composite seal was designed,and the working principle of the seal was analyzed.The leakage model of the seal and the failure criterion of the seal were analyzed theoretically.The two-dimensional Navier Stokes governing equation was derived.The mathematical model of reliability,the k-εturbulence equation and the constitutive model of the hyperelastic rubber were given.The pressure change of seal leakage and the stress of seal were discussed by finite element simulation.The results show that the pressure is decreased step by step with the sealing position after gas leakage.The maximum contact stress and equivalent stress of the seal ring are always greater than the working pressure of the gas,the shear stress is always less than the shear strength of the seal ring,and the sealing failure criterion is satisfied.This seal structure could be used in the drive piston of gas ejector

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赵昌方,任杰,周陈颖,唐子若,夏文嘉,卢炯彪.某新型燃气弹射传动活塞密封设计与分析[J].润滑与密封,2020,45(3):97-101.
. Seal Design and Analysis of a New Gas Ejector Drive Piston[J]. Lubrication Engineering,2020,45(3):97-101.

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  • 在线发布日期: 2020-04-23
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