机械密封混合摩擦微极流场数值模拟

机械密封混合摩擦求解涉及到弹性变形和流体动力润滑之间多物理量的流固耦合作用，计算难度较大，没有现成的商业软件可直接解决这个问题，因此采用C语言编程计算。考虑微极流体效应构建了混合摩擦的力学和数学模型，并利用有限差分法进行数值求解，获得了不同微极参数下内部流场的压力分布及机械密封泄漏量数值。计算结果表明，微极参数耦合数和特征长度的增加将使液膜的压力增大，从而减小内外压差使泄漏量下降，保证了密封的可靠性。

The Numerical Simulation for Micropolar Fluids Field of Mixing Friction in Mechanical Seal

It is quite difficult to solve the problem of mixing friction in mechanical seal has relation to coupling function on more physical quantities between spring deformation and elastic hydrodynamic lubrication. And no available business software can directly work it out, so the C language programming was used to calculate. Allowing for micropolar fluids effect, dynamics and mathematical models on mixing friction in mechanical seal were established, and the problems for the distributions of fluid film pressure in film lubrication under the different micropolar fluids parameters were solved by using finite difference method, then the solutions of pressure and spillage value were obtained. The results show that raising of micropolar fluids parameters such as coupling coefficient and characteristic length makes fluid film pressure increase, and then pressure drops and spillage decreases, which keeps seal reliability.