Research Papers: Gas Turbines: Structures and Dynamics

Numerical and Experimental Study for Unsteady Oil Film Thickness of the Rotating Cylinder Chamber Wall

[+] Author and Article Information
Zhao Jingyu

School of Power and Energy,
Northwestern Polytechnical University,
Xi'an 710129, China
e-mail: jingyu_nwpu@126.com

Liu Zhenxia

School of Power and Energy,
Northwestern Polytechnical University,
Xi'an 710129, China

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received December 29, 2014; final manuscript received April 24, 2015; published online June 2, 2015. Editor: David Wisler.

J. Eng. Gas Turbines Power 137(12), 122501 (Jun 02, 2015) (9 pages) Paper No: GTP-14-1684; doi: 10.1115/1.4030524 History: Received December 29, 2014

The oil film thickness on the bearing chamber wall directly affects the wall heat transfer efficiency, so a fundamental study on the motion of oil film on the rotating cylinder has been conducted to this end. On the one hand, the rotating cylinder test rig was designed, and an ultrasonic measurement system was established to measure the dynamic oil film thickness. On the other hand, the unsteady oil film heat and mass transfer movement model was also established, and the numerical simulation to solve oil film motion by using computational fluid dynamic (CFD) commercial software was carried out. Meanwhile, on the basis of study on the oil film formation process and film thickness verification, the oil film distributions on the chamber wall with rotation speed and oil flow rate were analyzed and studied. Results show that the oil film on the rotating chamber wall experiences a development process from the oil film formation to basic stability, about 1.0 s in this paper. And comparison between the numerical and experimental data shows that the maximum error between experimental data and numerical simulation is 7.76%. Moreover, for the oil film distributions in the stable state, oil film thickness shows a trend of decreasing with the increasing of rotation speed, but increasing with the increasing of oil flow rate. The research here will provide the basis for subsequent study of the interaction between oil film motion and the wall heat transfer.

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Fig. 1

Photograph of rotating cylinder test rig

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Fig. 2

Profile of rotating cylinder test rig

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Fig. 3

Hardware of ultrasonic measurement system

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Fig. 4

Photograph of probe

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Fig. 6

Control cell for the liquid film model

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Fig. 7

Measurement spot diagram

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Fig. 8

Experimental oil film thickness change history at site 135 deg

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Fig. 9

Calculated oil film thickness change history at site 135 deg

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Fig. 10

Comparison between experimental data and calculated results under different conditions: (a) 2400 rpm 300 L/hr, (b) 3000 rpm300 L/hr, (c) 3600 rpm 300 L/hr, (d) 3600 rpm 250 L/hr, and (e) 3600 rpm 360 L/hr

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Fig. 11

Effect of rotation speed on film thickness

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Fig. 12

Effect of oil flow rate on film thickness



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