摘要
采用计算流体力学(computational fluid dynamic,CFD)方法建立了贯通式袋型阻尼密封(fully partitioned pocket damper seal,FPDS)三维数值模型,并研究密封齿数Nb、密封齿厚度b及主/副腔室长度比λ对密封动力与泄漏特性的影响。结果表明:FPDS有效阻尼Ceff与直接刚度K的频率依赖性较高,直接阻尼C与交叉刚度k的频率依赖性较低且随着涡动频率的增加而降低;有效阻尼Ceff随齿数、密封齿厚度的增加而增大,而主/副腔室长度比对Ceff影响相对较小,在研究工况范围内,Nb=12时Ceff最高,较原始模型平均提高约12.69%,密封齿厚度b=5.048 mm时有效阻尼Ceff为原始模型的111%~138%,当主/副腔室长度比λ=5.1时有效阻尼Ceff仅为原始模型95%~105%;FPDS泄漏量随密封齿数减小而急剧增加,且主/副腔室长度比λ存在最佳值(λ=1)使密封泄漏性能最优,而密封齿厚度对密封泄漏量影响较小。
A three-dimensional numerical model of a fully partitioned pocket damper seal(FPDS)was established by using the computational fluid dynamics(CFD)method.The effects of tooth number N_(b),tooth thickness b and length ratioλof main-minor cavity on the dynamic and leakage characteristics of the FPDS were studied.The results show that the effective damping C_(eff) and direct stiffness K of FPDS are frequency-dependent highly.The direct damping C and cross-coupled stiffness k have low frequency dependence and decrease with the increase of whirling frequency.The effective damping increases with the increase of tooth number and tooth thickness,while the effective damping is affected by the length ratio of main-minor cavity relatively slightly.Within the scope of the study condition,when tooth number is 12,the effective damping achieves the maximum value and increases by about 12.69%on average compared with the original model;and the effective damping of the FPDS is about 111%to 138%of the original model when the seal tooth thickness is 5.048 mm;the effective damping of the FPDS is only 95%to 105%of the original model when the length ratio of main-minor cavity is 5.1.The results also show that the leakage flowrate of the FPDS increases sharply with the decrease of the seal tooth number.There exists an optimum length ratio of main-minor cavity of 1 to obtain the best leakage performance.The tooth thickness has little effect on the leakage flowrate of the FPDS.
作者
赵琳慧
张万福
秦鹏博
李春
ZHAO Lin-hui;ZHANG Wan-fu;QIN Peng-bo;LI Chun(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai,China,Post Code:200093)
出处
《热能动力工程》
CAS
CSCD
北大核心
2022年第9期31-40,共10页
Journal of Engineering for Thermal Energy and Power
基金
国家自然科学基金(51875361)
上海市自然科学基金(20ZR1439200)。
关键词
贯通式袋型阻尼密封
计算流体力学
有效阻尼
动力特性
泄漏量
fully partitioned pocket damper seal(FPDS)
computational fluid dynamics(CFD)
effective damping
rotordynamic characteristics
leakage flowrate
