转子动力学入门知识

1、 Introduction to Rotor Dynamics proven to be a good means to add additional damping to the rotor system to improve stability. In principle, the damper seal is like a silencer for a gun. It has radial holes which “trap” the gases and produce small “pockets of damping”. These technologies have been pu

2、t to good use in the recent years and have reduced the number of stability problems in the turbomachinery industry. Swirl brakes: The cause for aero-induced exciting forces, as noted above, is the swirl or the tangential velocity component of the gas. If we are able to redirect the gas to reduce the

3、 swirl velocity, we could potentially reduce the excitation forces. The swirl brake is a stationary ring with blade-like axial “teeth” along its circumference. The teeth redirect the gas flow and reduce the swirl velocity. This device improves the stability of the rotor-bearing system. It is used at

4、 the impeller eye seals and at the balance piston or division wall seal of a centrifugal compressor. Shunt holes: Similar to swirl brakes, taking gas off the diffuser of the last stage impeller and injecting it before the balance piston or division wall will also reduce the swirl velocity. They are

5、typically used at the division wall of a back-to-back compressor. Acknowledgement The information contained in this presentation consists of factual data and technical interpretations and opinions which, while believed to be accurate, is offered solely for information purposes. No representation or

6、warranty is made concerning the accuracy of such data, interpretations and opinions. Short Course at GMRC 2005 Page 21 of 23 Introduction to Rotor Dynamics 14. Moore, J. J. and Hill, D. L., 2000, “Design of Swirl Brakes for High Pressure Centrifugal Compressors Using CFD Techniques,” 8th Internation

7、al Symposium on Transport Phenomena and Rotating Machinery, ISROMAC-8, Vol. II, Honolulu, Hawaii, pp. 1124-1132, March 26-30 15. Ramesh, K, 2002, A State-of-the-art Rotor Dynamic Analysis Program, Proceedings of the 9th International Symposium on Transport Phenomena and Dynamics of Rotating Machiner

8、y, Honolulu, Hawaii, February 10-14 16. Moore, J.J, Walker, S.T., Kuzdzal, M.J., 2002, “Rotordynamic Stability Measurement During Full-Load, Full-Pressure Testing of a 6000 PSE Re-Injection Centrifugal ”, 32nd Turbo Machinery Symposium, Houston, TX. 17. Moore, J. J. and Soulas, T. A., 2003, “Damper Seal Comparison in a High Pressure ReInjection Centrifugal Compressor During Full-Load, Full-Pressure Testing Using Direct Rotordynamic Stability Measurement,” ASME, Proceedings of the 19th Biennial Conference on Mechanical