摘要
为了分析液体动压型机械密封环变形对间隙液膜特性的影响,基于Workbench平台建立动环-液膜-静环的双向流固热耦合计算模型,对变形后的内流场进行模拟计算,对双向流固热耦合前后内流场的压力、温度以及螺旋槽内速度进行对比分析,并比较了流固热耦合后开启力、摩擦扭矩以及泄漏量的变化.研究结果表明:经过双向流固热耦合计算后,液膜在动环端面附近受压缩,在静环端面附近沿周向呈明显波浪状周期性波动,外径处液膜平均厚度减小、内径处液膜平均厚度增大,液膜厚度最大变化约16.0%;双向流固热耦合前后压力场、温度场分布规律类似,但液膜最高压力明显变大,在文中计算工况下变大约67.0%,液膜最高温度略有变大,螺旋槽根部附近液体流速降低;考虑了流固热耦合变形后,液膜开启力变大,摩擦扭矩略微变大,泄漏量明显变大,且转速越高各密封性能参数的变化越大.
To analyze the influence of the deformation seal, the two-way fluid -solid -heat interaction model on the fluid film in hydrodynamic mechanical of rotating ring - fluid film - stationary ring was set up based on the workbench platform. The internal flow field after deformation was simulated, and the results obtained on the pressure, temperature and velocity in flow field were compared before and after the fluid - solid - heat interaction. At last, the sealing performance including opening force, friction torque and leakage was calculated and the differences of the performance before and after the fluid - solid - heat interaction were analyzed. The results show that the fluid film is compressed in the vicinity of end face on the rotating ring after the two-way fluid - solid - heat interaction calculation, and near the end face of the stationary ring, the fluid film thickness shows significant wavy cyclical fluctuations in the circumferential direction, creased near the inner diameter, the average thickness is decreased while the maximum change of fluid near the outer diameter, and infilm thickness is about 16%. The pressure and temperature distribution are similar before and after the coupling, however, the maximum pressure of the fluid film becomes larger which is about 67.0%, the maximum temperature is slightly higher, and the velocity near the root of the spiral groove is reduced. After considering the fluid - solid - heat deformation, the opening force and leakage become larger significantly, the friction torque is slightly larger too, and the higher the rotating speed, the greater the differences of the sealing performance parameters.
出处
《排灌机械工程学报》
EI
CSCD
北大核心
2017年第6期502-507,共6页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(51279067)
关键词
动压型机械密封
双向流固热耦合
内流场
密封性能
数值模拟
hydrodynamic mechanical seal
two-way fluid - solid - heat coupling
inner flow field
sealing performance
numerical simulation
