Main Article Content
Abstract
A small turbojet engine has been designed for UAV application and is intended to operate at high altitude and high subsonic speed. The mist lubrication system adopted initially for bearing to support a rotor speed of about 30000 rpm has exhibited good performance under test bed condition but incurs oil starvation during altitude operation. The present paper evaluates the performance of a mist lubrication system during flight and its limitations and drawbacks. The paper also highlights the performance of a close-loop system at altitude operating conditions enabling the system to meet the flight goal. The effect of lubrication pattern on bearing performance has been studied during this exercise. The bearings are found to be cooler with respect to engine speed as well as with altitude when working with closed loop system within the operating range.
Keywords
Article Details
References
- Shamim, A. and Kettleborough., "Tribological Performance Evaluation of Oil Mist Lubrication", J. Energy Resource Technology, September 1994, Vol.116, No. 3, pp.224.
- Heinz, P. Bloch and Abdus Shamim., Oil Mist Lubrication: Practical Applications, Prentice Hall International, 1998.
- Block, H.P., "Optimized Lubrication of Antifriction Bearings for Centrifugal Pumps", Lubrication Engineering, Vol. 35, No. 7, pp. 381-385, July 1979.
- Hafner, E.R., "Proper Lubrication - The key to Better Bearing Life", Mechanical Engineering, Vol. 99, No. 10, pp. 32-37, October 1977.
- Robert F. Handschuh and Wilfredo Morales., "Lubrication System Failure Baseline Testing on an Aerospace Quality Gear Mesh", NASA/TM2000- 209954, May 2000.
- Military Specification: General Specification for Engines, Aircrafts, Turbojet and Turbofan, MIL-E- 005007E(AS), 1983.
- Environmental Conditions and Test Procedures For Airborne Equipment, EUROCAE ED-14D/RTCA DO-160D, July 1997.
- Department of Defense Test Method Standard for Environmental Engineering Considerations and Laboratory Tests, MIL-STD-810F, January 2000.
- Mishra, R.K. et al., "Qualification of a Small Turbojet Engine for UAV A Challenge", Journal of Institution of Engineers (India), Aerospace Division, Vol.90, May 2009.
- Towne, C. A., "Practical Experience with Oil Mist Lubrication, Shell Chemical Company", 37th American Society of Lubrication Engineers, Annual Meeting in Cincinnati, Ohio, May 1982.
References
Shamim, A. and Kettleborough., "Tribological Performance Evaluation of Oil Mist Lubrication", J. Energy Resource Technology, September 1994, Vol.116, No. 3, pp.224.
Heinz, P. Bloch and Abdus Shamim., Oil Mist Lubrication: Practical Applications, Prentice Hall International, 1998.
Block, H.P., "Optimized Lubrication of Antifriction Bearings for Centrifugal Pumps", Lubrication Engineering, Vol. 35, No. 7, pp. 381-385, July 1979.
Hafner, E.R., "Proper Lubrication - The key to Better Bearing Life", Mechanical Engineering, Vol. 99, No. 10, pp. 32-37, October 1977.
Robert F. Handschuh and Wilfredo Morales., "Lubrication System Failure Baseline Testing on an Aerospace Quality Gear Mesh", NASA/TM2000- 209954, May 2000.
Military Specification: General Specification for Engines, Aircrafts, Turbojet and Turbofan, MIL-E- 005007E(AS), 1983.
Environmental Conditions and Test Procedures For Airborne Equipment, EUROCAE ED-14D/RTCA DO-160D, July 1997.
Department of Defense Test Method Standard for Environmental Engineering Considerations and Laboratory Tests, MIL-STD-810F, January 2000.
Mishra, R.K. et al., "Qualification of a Small Turbojet Engine for UAV A Challenge", Journal of Institution of Engineers (India), Aerospace Division, Vol.90, May 2009.
Towne, C. A., "Practical Experience with Oil Mist Lubrication, Shell Chemical Company", 37th American Society of Lubrication Engineers, Annual Meeting in Cincinnati, Ohio, May 1982.