A study of the effects of inlet preswirl on the dynamic coefficients of a straight-bore honeycomb gas damper seal
A study of the effects of inlet preswirl on the dynamic coefficients of a straight-bore honeycomb gas damper seal
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DOI：
10.1115/1.2227416
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发表时间：
2004
影响因子：
1.5
通讯作者：
Tony B. Sprowl;D. Childs
中科院分区：
文献类型：
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作者：
Tony B. Sprowl;D. Childs
在高压离心式压缩机中，蜂窝密封经常被用作迷宫密封的替代品，以提高转子的动态稳定性。人们担心，如果蜂窝腔堵塞，这种增强的稳定性将会丧失。在相同的恒定间隙下，使用供应压力为70 bar的空气，对蜂窝密封和光滑密封（代表蜂窝密封完全堵塞）进行静态和动态测试。测试矩阵包括三种速度、三种压力比和三种进口预涡条件。结果表明，预旋流光滑密封的泄漏量增加，同步刚度降低，动态稳定性降低。结果强烈支持在蜂窝密封的入口使用涡流制动器，如果堵塞是一个问题。将测试结果与克莱因汉斯和蔡尔兹的双控制体积理论的预测进行比较，总体上显示出极好的一致性。
Honeycomb seals are frequently used as replacements for labyrinth seals in high-pressure centrifugal compressors to enhance rotordynamic stability. A concern exists that this enhanced stability will be lost if the honeycomb cavities become clogged. Static and dynamic tests were conducted on a honeycomb and a smooth seal (representing the honeycomb seal with completely clogged cells) at the same constant clearances using air with a supply pressure of 70 bars. The test matrix included three speeds, three pressure ratios, and three inlet preswirl conditions. The results show increased leakage, decreased synchronous stiffness, and decreased dynamic stability for the smooth seal with pre-swirled flow. The results strongly support the use of swirl brakes at the entrance of a honeycomb seal if clogging is a concern. Comparisons between test results and predictions from a two-control-volume theory by Kleynhans and Childs showed excellent agreement in general.