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High-speed Friction and Sealing Characteristics of Step Seal under Mixed Lubrication Conditions

LI Yongkang1,2;WANG Jun1;LIAN Zisheng1, 2   

  1. 1.College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan,030024
    2.Shanxi Key Laboratory of Fully Mechanized Coal Equipment,Taiyuan,030024
  • Online:2021-03-10 Published:2021-03-17



  1. 1.太原理工大学机械与运载工程学院,太原,030024
  • 基金资助:

Abstract:  A numerical model of step seal was established which accounts for combined effects of fluid cavitation, elastic contact deformation, and micro asperity contact mechanics to accurately investigate high speed friction and sealing characteristics based on mixed lubrication theory. The effects of sealed pressure and reciprocating velocity on friction, leakage, as well as film thickness distributions were analyzed. Reciprocating experiment rig was conducted to verify the accuracy of the proposed model. The results show that experimental frictions are similar to numerical calculated frictions. The mixed lubrication model may simulate sealing characteristics of high-speed piston pair better. Fluid pressure and contact pressure affect sealing performance together, while contact friction of roughness is dominant.

Key words:  plunger, dynamic seal, mixed friction, lubrication

摘要: 为准确研究斯特封高速摩擦与密封特性,基于混合润滑理论,综合流体空化效应、密封接触变形和微观粗糙峰接触等因素影响,建立了斯特封摩擦与密封的数值计算模型。研究了往复运动速度和密封压力对油膜厚度、摩擦力和泄漏量的影响,搭建了往复密封试验台来验证模型的准确性。结果表明:计算摩擦力与实验摩擦力相近。混合润滑模型能更好地模拟高速柱塞副斯特封的摩擦与密封特性,油膜压力与粗糙度接触压力共同影响密封性能,但粗糙度接触摩擦起主导作用。

关键词: 柱塞, 动密封, 混合摩擦, 润滑

CLC Number: