Eight-stage steam turbine rotor dynamics analysis. Technical report No. 78TR13
Reports of a design review and dynamic analysis of the rotor system of an 8-stage steam turbine for propulsion systems are reported. This turbine had a design speed of 60,000 rpm. Previous analysis indicated that the rotor first critical speed occurs in the 20,000 to 28,000 rpm range, and that operation in that speed range should be minimized. The current analysis of the rotor system indicates the potential of a rotor dynamics problem in the first critical speed range. Good balance and an effective turbine end bearing damper are required to control the rotor dynamic response. The existing turbine end bearing damper is inadequate. Examination of the hardware revealed evidence of motion of the squirrel cage within the housing. Design modifications are required to achieve desired damping characteristics. Turbine wheel fits, measured after disassembly of the turbine, exceeded limits specified by the design drawings and contribute to the potential rotor unbalance problem. Further, balance shifts may occur during operation due to the loose wheel fits. (LCL)
- Research Organization:
- Mechanical Technology, Inc., Latham, N.Y. (USA)
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 5202346
- Report Number(s):
- COO-2835-5
- Country of Publication:
- United States
- Language:
- English
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