转子动力学入门知识.

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12、i )w*M 7W dat. ad OMbrtf (W 创* X rteRTM* 2 伽Z 2 n MMffy aMa teUvrvue f Oma*In troduct ion to Rotor Dyn amics prove n to be a good means to add additi onaldamping to the rotor system to improve stability. In principle, the damper seal is like asile ncer for a gun .It has radial holes which“ trap ” th

13、e gases and produce smallof damp ing ” . These tech no logies have bee n put to good use in the rece nt years and have reduced the nu mber of stability problems in the turbomach inery in dustry. ? Swirl brakes: The cause for aero-i nduced excit ing forces, as no ted above, is the swirl or the tangen

14、 tial velocity component of the gas. If we are able to redirect the gas to reduce the swirl velocity, we could potentially reduce the excitation forces. The swirl brake is a stationary ring with blade-like axial“teeth ” aiougriferenee. The teeth redirect the gas flowand reduce the swirl velocity. Th

15、is device improves the stability of the rotor-bearing system. It is used at the impeller eye seals and at the bala nee pist on or divisi on wall seal of a centrifugal compressor. Shunt holes: Similar to swirl brakes, taking gas off the diffuser of the last stage impeller and in ject ing it before th

16、e bala nee pist on or divisi on wall will also reduce the swirl velocity. They are typically used at the division wall of a back-to-back compressor. ? Ack no wledgeme nt The in formatio n contained in this prese ntati on con sists of factual data and tech ni cal in terpretati ons and opinions which,

17、 while believed to be accurate, is offered solely for information purposes. No represe ntati on or warra nty is made concerning the accuracy of such data, in terpretati ons and opi nions. Short Course at GMRC 2005 Page 21 of 23In troduction to Rotor Dyn amics 7.0 Refere nces: 1. Kirk, R.G., 1980,“St

18、ability anDamped Critical Speeds: How to Calculate and Interpret thResults, ” CAGI Technical DIGEST, Vol. 12, No. 2, pp. 375-383 2. Ruddy, A.V., and Summers-Smith, D., 1980,“ An In troducti on to the in flue nee of the beari ngs on the dyn amics of rotati ng machi nery Tribology In ternatio nal, Oct

19、ober. 3. White, D.C., 1972, e Dy namics ofRrgiid Rotor Supported on Squeeze Film Beari ngs, ” I.Mech.E., Conference on Vibrati on in Rotat ing Systems, pp. 213229. 4. API Sta ndard 617 7th Editio n, July 2002,“ Axial a ndCen trifugal Compressors and Expa ndercompressors for Petroleum, Chemical and G

20、as Industry Services ” 5. Memmott, E. A., 2002,“Lateral Rotordynamic Stability Criteria forCentrifugal Compressors,” CMVA, Proceedings of the 20th Machinery DynamicsSeminar, Quebec City, pp. 6.23-6.32, October 21-23 6. Memmott, E. A., 2000,“ Empical Estimati on of a Load Related Cross-Coupled Stiff

21、ness and The LateralStability Of Cen trifugal Compressors,” CMVA, Proceedi ngs of the 18th Mach in eryDynamics Seminar, Halifax, pp. 9-20, April 26-28. 7. Wachel, J. C. and von Nimitz, W.W., 1981, Ensuring the Reliability of Offshore Gas Compressor Systems, Journal ofPetroleum Technology, pp. 2252-2

22、260, Nov. 8. Alford, J. S., 1965, Protecting Turbomach inery from Self-Excited Whirl, ASME Jour nal of Engin eeri ng for Power, Vol. 38, pp. 333-344 9. Memmott, E. A., 1992, Stability of Cen trifugal Compressors by Applicati ons of Tilt Pad Seals, Damper Beari ngs, and Shunt Holes, IMechE, 5th Inter

23、n ati onal Conference on Vibrati ons in Rotati ng Mach in ery, Bath, pp. 99-106, September 7-10. 10. Marshall, D. F., Hustak, J. F., and Memmott, E. A., 1993, Elimi natio n of Subs ynchronous Vibrati on Problems in a Cen trifugal Compressor by the Applicatio n of Damper Beari ngs, Tilti ng Pad Seals

24、, and Shu nt Holes, NJIT-ASME-HI- STLE, Rotati ng Machi nery Conference and Expositi on, Somerset, New Jersey, November 10-12. 11. Memmott, E. A., 1994, Stability of a High Pressure Cen trifugal Compressor Through Applicatio n of Shunt Holes and a Hon eycomb Labyri nth, CMVA, 13th Machinery Dynamics

25、 Seminar, Toronto, Canada, pp. 211-233, September 12-13. 12.Kuzdzal, M. J. and Hustak, J. F., 1996, Squeeze Film Damper Beari ng Experime ntal vs.An alytical Results for Various Damper Con figurati on s, Proceedi ngs of the Twenty FifthTurbomach inery Symposium, Turbomach inery Laboratory, Departme

26、nt of Mecha ni calEngineering, Texas A&M University, College Station, Texas, September 17-19. 13.Ramesh, K and Kirk, R. G., 1999,“ Non li near Resp onse of Rotors Supported on SqueezeFilm Dampers, ” Proceedings of DETC997th Bnnial ASME Vibrations Conference, ASME Paper DETC99/VIB-8294, Las Vegas, Ne

27、vada, September 12-15 Short Course at GMRC 2005 Page 22 of 23In troduction to Rotor Dy namics 14. Moore, J. J. and Hill, D. L., 2000,“ Desig nSwirl Brakes for High Pressure Centrifugal Compressors Using CFD Technjues, ” 8thIntern ati onal Symposium on Tran sport Phe nomena and Rotati ng Mach in ery, ISROMAC-8, Vol. II, Ho