中文摘要：

对某小流量二氧化碳离心压缩机上的迷宫密封添加了逆向辅助密封齿,分别从辅助装置的高度和安装位置两方面对密封性能的影响进行了三维黏性数值模拟分析。结果表明,添加逆向辅助密封齿对密封的性能有很大的改善：齿高厚比为9时,其泄漏损失系数较基本密封齿型的密封结构下降45%;齿偏移量与厚度比值为4时,其泄漏损失系数较基本密封齿型的密封结构下降47.6%。

英文摘要：

The reverse auxiliary teeth are added in the labyrinth seal of a carbon dioxide centrifugal compressor with low flow coefficient.The influence of the height and installation position of the auxiliary device on the sealing performance is analyzed by three-dimensional viscous numerical simulation.The results show that the sealing performance is greatly improved by adding the reverse auxiliary teeth.When the ratio of height to thickness of the auxiliary tooth is 9,the leakage loss coefficient reduces by 45%compared with the case of basic seal structure.Meanwhile the coefficient decreases of 47.6%as the ratio of offset to thickness is 4.