双向旋转梯形槽干气密封流场的数值模拟

Numerical Simulation of Sealing Performance of Dry Gas Seal with Bi-direction Trapezoid Grooves

介绍一种用作抑制密封的新型泵用双向旋转梯形槽干气密封,并定义了该密封的主要几何结构参数。基于气体润滑理论,建立了梯形槽干气密封端面流场的数值计算模型。利用Fluent软件对流场进行数值模拟,获得了端面气膜压力分布、气流速度场、开启力及泄漏率等数据,并分析了端面槽深、槽宽比、吸入角和槽长坝长比对端面开启力、泄漏率这2个主要密封性能参数的影响规律,发现该密封的开启力与泄漏率均随槽深、槽宽比和槽长坝长比的增大而增大,随吸入角的增大而减小。研究结果为双向旋转梯形槽干气密封的设计和进一步研究提供了参考。

A new type of dry gas seal with bi-direction trapezoid grooves used as the containment seal for a pump was introduced and main geometrical parameters of the seal were defined. Based on gas lubrication theory,a numerical simulation model of the flow field between the seal faces of the seal was established. In order to obtain the pressure distribution,gas velocity field,opening force of the gas film,and seal leakage,the Fluent software was used to simulate the gas flow between the faces. The influences of the geometrical parameters,such as groove depth,groove width ratio,groove inlet angle,and groove length ratio on the face opening force and leakage were discussed. The results showed that both the opening force and the leakage increased with the increased of groove depth,width ratio,and length ratio and decreased with the increase of groove inlet angle. The results could provide the basis for design and further investigation of the dry gas seal with bi-direction trapezoid grooves.