摘要
为研究不同后挡板结构指尖密封的泄漏流动及温度分布,将指尖密封片区域处理为多孔介质模型,建立标准型、压力平衡型、通腔型以及翼型4种不同后挡板结构的指尖密封计算模型,利用计算流体力学方法进行求解,探究不同压差与转速下不同后挡板结构的指尖密封的滞后效应、泄漏特性以及温度分布。结果表明:标准型与压力平衡型指尖密封滞后效应相似,通腔型与翼型指尖密封滞后效应低于标准型与压力平衡型;压差对通腔型指尖密封的泄漏量影响最大,对标准型的泄漏量影响最小;转速对标准型指尖密封的影响最大,对翼型的影响最小;在同一压差与转速下,标准型指尖密封的最高温度最高,翼型指尖密封的最高温度最低,表明摩擦热对翼型指尖密封的影响最小。研究表明,翼型后挡板结构与通腔型降低滞后效应相似,但其泄漏量低于通腔型,且翼型后挡板结构在同一压差与转速下有更长的使用寿命。研究结果对指尖密封的优化设计具有一定指导意义。
In order to study the leakage characteristics and temperature distribution in finger seals with different rear baffle structures,the sealing area of the finger seals was treated as a porous medium model,four kinds calculation models were established,including standard,pressure balance,through-cavity and wing finger seals.Computational fluid dynamics was used to solve the models,and the hysteresis effect,leakage characteristics and temperature distribution of the finger seals with different rear baffle structures was studied at different differential pressures and rotational speeds.The results show that the hysteresis effect of standard and pressure balance finger seals is similar,while the hysteresis effect of through-cavity and wing finger seals is lower than that of standard and pressure balance finger seals.The pressure difference has the greatest impact on the leakage of the through-cavity finger seal,and the smallest impact on the leakage of the standard finger seal.The rotational speed has the greatest impact on the standard finger seal,and the least impact on the wing finger seal.At the same pressure difference and rotational speed,the standard finger seal has the highest maximum temperature,while the wing finger seal has the lowest maximum temperature,indicating that frictional heat has the least impact on the wing finger seal.Research shows that the wing finger seal has a similar hysteresis effect to the through-cavity seal,but its leakage rate is lower than that of the through-cavity seal,and the wing finger seal has a longer service life at the same pressure difference and speed.The research results are of some guiding significance for the optimization design of fingertip seals.
作者
张庭军
王娟
刘美红
ZHANG Tingjun;WANG Juan;LIU Meihong(Faculty of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming Yunnan 650500,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2024年第12期136-143,共8页
Lubrication Engineering
基金
国家自然科学基金项目(51765024)。
关键词
后挡板结构
多孔介质
滞后效应
泄漏特性
温度分布
rear baffle structure
porous medium
hysteresis effect
leakage characteristics
temperature distribution
