摘要
为获得大偏心以及大扰动下涡轮泵浮动环密封的转子动力特性,采用修正的Bulk-Flow模型和CFD准稳态法进行了研究。通过试验数据验证了两种方法的求解精度及可靠性,获得了不同静偏心以及扰动量下密封动特性系数的变化规律。结果表明:修正的Bulk-Flow模型和CFD准稳态法均能较好地预测密封动特性系数,且CFD法具有更高的求解精度;对于高压高转速涡轮泵,浮动环密封引入的刚度与滚动轴承刚度量级相当,其对转子系统动力学特性影响不应忽略;大偏心下密封各动特性系数显著增大,而大扰动下,各系数与扰动量之间呈现出复杂的非线性关系。
A revised Bulk-Flow model and the quasi-steady CFD method were adopted to investigate the rotordynamic characteristics of a turbopump floating ring seal under large eccentricities and disturbances.The precision and reliability of these two methods were verified by the seal test data and the variation of the rotordynamic characteristics of the seal under different eccentricities and disturbances were obtained.Results show that the revised Bulk-Flow model and the CFD method can effectively predict the rotordynamic coefficients of seals and the CFD method presents better accuracy.For high-pressure-speed turbopumps,the stiffness introduced by a floating ring seal is comparable to the stiffness of the rolling bearing,thus the influence of the seal on rotor dynamic characteristics should not be ignored.The rotordynamic coefficients increase significantly under large eccentricities while the complex nonlinear relationship is depicted between these coefficients and large disturbances.
作者
杨宝锋
贾少锋
李斌
陈晖
YANG Baofeng;JIA Shaofeng;LI Bin;CHEN Hui(Science and Technology on Liquid Rocket Engine Laboratory,Xi an 710100,China;Xi an Aerospace Propulsion Institute,Xi an 710100,China;Academy of Aerospace Propulsion Technology,Xi an 710100,China)
出处
《火箭推进》
CAS
2019年第6期1-9,共9页
Journal of Rocket Propulsion
基金
国家重点基础研究发展计划(613321)
关键词
涡轮泵
密封
大偏心
大扰动
Bulk-Flow
计算流体力学
动力学特性
turbopump
seal
large eccentricity
large disturbance
Bulk-Flow
computational fluid dynamics
dynamic characteristics
