摘要
采用基于两控制容积Bulk Flow理论和可压缩理想气体模型开发的计算程序对孔型密封转子的动力特性进行了分析,计算了在不同进口预旋、密封间隙和孔深时孔型密封转子的动力特性系数,并将其与已有的实验数据进行了比较.结果表明:增大进口预旋会使有效刚度和有效阻尼减小,交叉刚度增大,对转子稳定性不利;过大或过小的密封间隙尺寸均对孔型密封的总体性能不利;孔型密封的有效刚度和穿越频率对孔深的变化不敏感,但有效阻尼随孔深的减小而显著增大.计算结果与实验值吻合良好.
The rotor dynamic characteristics of the hole-pattern annular gas seal were investigated with the code developed on the base of two-control-volume Bulk Flow theory and compressible ideal gas model. The effects of inlet pre-whirl, sealing clearance and hole-depth on the rotor dynamic coefficients of the hole- pattern seal were studied and compared to the published experimental data. Results show that the effective stiffness and direct damping decrease with increasing the inlet pre-whirl ratio, but the cross-coupled stiffness illustrates the opposite trend, thus unprofitable to the stability of the rotor. Too large or too small sealing clearance was all harmful to the overall performance of the hole-pattern seal. The effective stiffness and cross-over frequency were not sensitive to variation of the hole-depth, while the effective damping increases significantly with the decrease of hole-depth. Predictions from the presented analytical method are well in agreement with the experimental data.
出处
《动力工程》
CAS
CSCD
北大核心
2009年第1期31-35,共5页
Power Engineering
基金
国家重点基础研究计划(973计划)资助项目(2007CB707705)
新世纪优秀人才支持计划资助项目(NCET-07-0669)
