密封动力特性影响因素CFD数值分析  

CFD numerical analysis of influence factors of seal rotordynamic characteristics

作　　者：孙丹[1,2] 王双[1,2] 艾延廷[1,2] 王克明[1,2] 胡广阳[3] 刘宁宁[1,2] 

机构地区：[1]沈阳航空航天大学航空航天工程学部(院),沈阳110136 [2]辽宁省航空推进系统先进测试技术重点实验室,沈阳110136 [3]中航工业沈阳发动机设计研究所第5研究室,沈阳110015

出　　处：《沈阳航空航天大学学报》2016年第1期1-7,共7页Journal of Shenyang Aerospace University

基　　金：国家自然科学基金(项目编号:11302133);航空科学基金(项目编号:20140454003);辽宁省自然科学基金(项目编号:2015020113)

摘　　要：研究了CFD旋转坐标系技术,应用旋转坐标系将非定常流动问题转化成定常问题,建立迷宫密封动力特性求解模型,对密封流场及密封动力特性系数进行求解研究。计算进出口压比、转速、预旋等不同条件下密封的动力特性系数及涡动系数,研究了密封动力特性的影响因素,在数值计算的基础上,进一步分析了密封气流激振力的影响因素。研究表明,随着进口压力与转速的增加,交叉刚度系数k增加,直接阻尼系数C减小,涡动系数增加,对转子稳定性不利。密封内流体的周向流动是产生密封气流激振力的重要原因。The Moving Reference Frame technology was studied in the paper by transforming unsteady flowinto steady one using Moving Reference Frame method. The rotordynamic characteristics of labyrinth seal models were set up to evaluate the seal rotordynamic characteristics and flowfield characteristics. The seal rotordynamic characteristics and whirl coefficients under different pressure ratios,rotational speeds,and prerotation conditions were evaluated to study the influence factors of seal rotordynamic characteristics,and the influence factors of exciting force produced by seal air flowwere further analyzed on the basis of numerical calculations. The results,which are unfavorable for the stability of the rotor,showthat with the increase of the inlet pressure and rotational speed,the cross stiffness coefficient k increases,the direct damping C decreases,and the whirl coefficient increases,and the seal fluid circumferential flowis the main cause of the seal airflowexciting force.

关 键 词：密封 动力特性 CFD 旋转坐标系 数值分析 

分 类 号：O35[理学—流体力学]