The feasibility of using presently available liquid lubricants in advanced, high speed aircraft engines has been investigated with a recirculating inerted lubrication system. Three fluids performed satisfactorily for short durations of 3-10 hr in a full-scale simulated aircraft bearing and seal assembly at an outer race bearing temperature of 700 F and with a bulk fluid temperature of 500 F. The principal problem has been with excessive leakage of the oil side bellows face seals which has accounted for a majority of the test terminations. With only one lubricant (a MIL-L-7808E oil) could bearing failure be blamed on a lack of lubricating ability. An inerted oil mist once-through system was also tested, but with less promising results with only one lubricant running successfully at 600 F bearing temperature. The mist system appears to be limited by its inability to maintain stable bearing temperatures and requires further development.The feasibility of using presently available liquid lubricants in advanced, high speed aircraft engines has been investigated with a recirculating inerted lubrication system. Three fluids performed satisfactorily for short durations of 3-10 hr in a full-scale simulated aircraft bearing and seal assembly at an outer race bearing temperature of 700 F and with a bulk fluid temperature of 500 F. The principal problem has been with excessive leakage of the oil side bellows face seals which has accounted for a majority of the test terminations. With only one lubricant (a MIL-L-7808E oil) could bearing failure be blamed on a lack of lubricating ability. An inerted oil mist once-through system was also tested, but with less promising results with only one lubricant running successfully at 600 F bearing temperature. The mist system appears to be limited by its inability to maintain stable bearing temperatures and requires further development.
Lubricants for Inerted Lubrication Systems in Engines for Advanced Aircraft
Sae Technical Papers
National Air Transportation Meeting ; 1968
01.02.1968
Aufsatz (Konferenz)
Englisch
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