泵出型螺旋槽油气密封泄漏特性及参数影响研究  

Study on leakage characteristics and parameter influence of pump-out spiral groove oil-gas seal

作　　者：江锦波[1] 彭新 许文烜 门日秀[2] 刘畅[2] 彭旭东[1] JIANG Jinbo;PENG Xin;XU Wenxuan;MEN Rixiu;LIU Chang;PENG Xudong(College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310029,Zhejiang,China;Science and Technology on Diesel Engine Turbocharging Laboratory,China North Engine Research Institute,Tianjin 300400,China)

机构地区：[1]浙江工业大学机械工程学院,浙江杭州310029 [2]中国北方发动机研究所柴油机增压技术重点实验室,天津300400

出　　处：《化工学报》2023年第6期2538-2554,共17页CIESC Journal

基　　金：柴油机高增压技术国防科技重点实验室基金项目(6142212200301);国家自然科学基金项目(52075491,52076195)。

摘　　要：以泵出型螺旋槽油气密封为研究对象,基于油相和气相连续性方程推导并建立了油气密封流场求解的双相雷诺模型,采用有限体积法离散和编程求解获得了油气密封介质流场分布,对比分析了商用软件VOF模型、单相雷诺模型和双相雷诺模型在求解油气密封流场中的计算精度和效率,研究了密封间隙、油气比、转速、介质压力等运行参数和密封环尺寸对油气密封流场和稳态性能的影响,重点探讨了油气密封近零泄漏特性及其关键影响因素。结果表明,提出的双相雷诺模型求解方法是一种高精度、高效率的油气密封流场数值模拟方法,具有与商用软件VOF模型近似的精度,但计算时间降低1个数量级;油气密封的介质泄漏特性和近零泄漏压差主要受到密封间隙、转速和端面宽度的影响,通过上述参数的合理取值有望实现油气介质的零泄漏。Taking the pump-out spiral groove oil-gas seal as the research object,the two-phase Reynolds model for solving the flow field of oil-gas seal was established based on the continuity equations of oil and gas phase,respectively.The flow field distribution of the oil-gas sealing medium is obtained by using the finite volume method to discretize and program the solution.The calculation accuracy and efficiency of commercial software VOF model,single-phase Reynolds model and two-phase Reynolds model in solving the flow field of oil-gas seal were compared and analyzed.The effects of operating parameters such as seal gap,oil-gas ratio,rotational speed,medium pressure,and seal ring size on the flow field and steady-state performance of the oil-gas seal were studied,and the near-zero leakage characteristics of the oil-gas seal and its key influencing factors were discussed.The results show that the proposed two-phase Reynolds model method is a high precision and efficient numerical method for calculating the flow field of oil-gas seal.It has the approximate accuracy with the commercial software VOF model,while the calculation time is reduced by one order of magnitude.The medium leakage characteristics and near zero leakage pressure differential of oil-gas seal are mainly affected by the seal clearance,rotational speed and seal ring width.It is expected to achieve zero leakage of oil-gas through the reasonable value of the above mentioned parameters.

关 键 词：气液两相流 数值模拟 优化设计 油气端面密封 涡轮增压器 

分 类 号：TH117.2[机械工程—机械设计及理论]