动压型机械密封内流场及性能的流固热耦合
发布时间：2018-07-28 14:18
【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.
[Abstract]:In order to analyze the effect of hydrodynamic pressure seal ring deformation on the characteristics of liquid film, a bidirectional fluid-solid-heat coupling calculation model was established based on Workbench platform, and the internal flow field after deformation was simulated. The pressure, temperature and velocity in the helical groove before and after the bidirectional fluid-solid-heat coupling are compared and the changes of the opening force, friction torque and leakage rate after the fluid-solid-heat coupling are compared. The results show that the liquid film is compressed near the end surface of the moving ring after bidirectional fluid-solid-heat coupling calculation, and fluctuates obviously along the circumferential direction, and the average thickness of the liquid film decreases at the outer diameter. The average thickness of liquid film increases and the maximum thickness of liquid film changes about 16.0 at the inner diameter. The distribution of pressure field and temperature field before and after bidirectional fluid-solid-thermal coupling is similar, but the maximum pressure of liquid film increases obviously. In this paper, the maximum temperature of liquid film increases slightly, and the velocity of liquid near the root of spiral groove decreases. Considering the fluid-solid-heat coupling deformation, the opening force of liquid film becomes larger, the friction torque is slightly larger, and the leakage volume is obviously increased. And the higher the rotational speed, the greater the change of the sealing performance parameters.
【作者单位】： 江苏大学能源与动力工程学院;
【基金】：国家自然科学基金资助项目(51279067)
【分类号】：TH136
，
本文编号：2150489
[Abstract]:In order to analyze the effect of hydrodynamic pressure seal ring deformation on the characteristics of liquid film, a bidirectional fluid-solid-heat coupling calculation model was established based on Workbench platform, and the internal flow field after deformation was simulated. The pressure, temperature and velocity in the helical groove before and after the bidirectional fluid-solid-heat coupling are compared and the changes of the opening force, friction torque and leakage rate after the fluid-solid-heat coupling are compared. The results show that the liquid film is compressed near the end surface of the moving ring after bidirectional fluid-solid-heat coupling calculation, and fluctuates obviously along the circumferential direction, and the average thickness of the liquid film decreases at the outer diameter. The average thickness of liquid film increases and the maximum thickness of liquid film changes about 16.0 at the inner diameter. The distribution of pressure field and temperature field before and after bidirectional fluid-solid-thermal coupling is similar, but the maximum pressure of liquid film increases obviously. In this paper, the maximum temperature of liquid film increases slightly, and the velocity of liquid near the root of spiral groove decreases. Considering the fluid-solid-heat coupling deformation, the opening force of liquid film becomes larger, the friction torque is slightly larger, and the leakage volume is obviously increased. And the higher the rotational speed, the greater the change of the sealing performance parameters.
【作者单位】： 江苏大学能源与动力工程学院;
【基金】：国家自然科学基金资助项目(51279067)
【分类号】：TH136
，
本文编号：2150489
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