不等深梯形槽干气密封的研究及槽型优化
邱海涛，陈志*，范唯超，吉华，李建明
（四川大学 化学工程学院，四川 成都 610065）
摘要：针对相同的平面结构，设计出多种不等深梯形槽结构，建立了相关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，获得了不同膜厚下不同结构的气膜刚度、开启力、泄漏率、刚漏比等数据，研究结果表明不等深阶梯槽的刚度、刚漏比比平底槽高，但开启力比平底槽低些。使用正交优化计算进一步探究槽深、槽数、入口角、槽宽比、槽长坝长比对开启力、泄漏率对发散阶梯梯形槽密封性能参数的影响。该工况下，发散型梯形槽最优设计方案为：最大槽深为10 μm、槽数为12、入口角为12°、槽宽比为0.88、槽长坝长比为0.78，研究结果为相关密封设计研究提供了一定的参考。
关键词：干气密封；梯形槽；不等深槽；正交优化计算
中图分类号：TB42 文献标志码：A doi：10.3969/j.issn.1006-0316.2020.04.004
文章编号：1006－0316 (2020) 04－0020－07
Optimization of Unequal Depth Trapezoidal Grooves for Dry Gas Seals
QIU Haitao，CHEN Zhi，FAN Weichao，JI Hua，LI Jianming
( College of Chemical Engineering, Sichuan University, Chengdu 610065, China )
Abstract：A variety of trapezoidal groove structures with unequal depth are designed on the same plane structure, and the numerical calculation model of the flow field on the end face of the dry gas seal is established. The convection field is simulated with FLUENT software. Consequently, the stiffness, opening force, leakage rate, and stiffness leakage ratio of different structures under different film thickness are obtained. The research results show that the stiffness, stiffness leakage ratio of different depth stepped grooves are better than those of flat bottom groove, but the opening force is lower than that of flat bottom groove. The orthogonal optimization calculation is used to further explore the influences of groove depth, groove number, entrance angle, groove width ratio, groove length dam length ratio on the opening force, leakage rate and other sealing performance parameters of diverging ladder trapezoidal groove with unequal depth. Under this working condition, the optimal design scheme of divergent groove is: the maximum groove depth is 10 μm, the number of grooves is 12, the entrance angle is 12°, the groove width ratio is 0.88, and the groove length dam length ratio is 0.78.
Key words：dry gas seal；trapezoidal groove; unequal deep groove；orthogonal optimization calculation
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收稿日期：2019－10－28
作者简介：邱海涛（1995－），男，湖南娄底人，硕士研究生，主要研究方向为流体密封技术。*通讯作者：陈志（1962－），女，四川成都人，教授，主要研究方向为流体密封技术和流体机械，chenzhi_hx@scu.edu.cn。
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