EFFECT OF COOLING AIR FLOW RATE ON ROTORDYNAMIC PERFORMANCE OF OIL-FREE POWER TURBINE SYSTEM SUPPORTED ON GAS FOIL BEARINGS FOR 7.5 KW MICRO GAS TURBINES
- EFFECT OF COOLING AIR FLOW RATE ON ROTORDYNAMIC PERFORMANCE OF OIL-FREE POWER TURBINE SYSTEM SUPPORTED ON GAS FOIL BEARINGS FOR 7.5 KW MICRO GAS TURBINES
- 심규호; 구본진; 장건희; 이용복; 김창호
- Issue Date
- STLE 68th annual meeting, 2014
- This paper presents the effects of cooling air flow rate on the rotordynamic performance of the oil-free power turbine driven by a micro turbo-jet engine. The cooling air flow removes heat conducted from the hot turbine and flows out through the hollow turbine shaft and the supporting GFJBs and GFTBs. A series of rotor coast-down tests reveal that the increasing cooling air flow decreases dramatically the amplitudes of sub-synchronous motions at 50 krpm and delays
the onset speed of sub-synchronous motions. Presently, the authors believe that the rotordynamic improvement with increasing axial flow rates are attributed to a decrease in the radial bearing clearance due to radial thermal expansions and/or a reduction in the destabilizing force caused by the crosscoupled stiffness . Future work will focus on the analysis and discussion about the present test results.
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