03.3 - Basic Fluid Dynamics and Flow Control
STUDY OF THE SCAVENGE PUMP PERFORMANCE FOR TWO-PHASE FLOW IN AN AIRCRAFT ENGINE LUBRICATION SYSTEM
N. Wu¹, J.-P. Hu¹, Y.-G. Lyu¹, J. Wang¹, Y. Tan¹, Z.-X. Liu¹; ¹Northwestern Polytechnical University, China
The lubrication system of aircraft engines supplies lubricating oil to the bearings and gears for lubrication, which mixes with the sealed air in the cavity to form an oil-air mixture in the bearing cavity and accessory gearbox. The oil return pump suctions the oil-air mixture for transport to components such as the oil-gas separator for the recovery of lubricating oil, and ultimately returns to the sliding oil tank for cyclic use. For the problem of poor oil return effect of the oil return pump, this paper focuses on studying the scavenge pump and conducts experimental research on the flow rate performance under negative pressure at high altitude based on ground tests. The high-altitude state takes the local atmospheric pressure at different flight altitudes of the aircraft as a reference, adjusts the inlet pressure of the pumps at all levels to the reference value, and measures the flow rate after reaching stability; the ground state obtains the flow rate characteristics of the pumps at different outlet pressures by adjusting the pressure after the pumps. This article obtains the effect of inlet pressure, outlet pressure, and rotational speed on the flow characteristics and volumetric efficiency of the oil return pump under high-altitude pressures in the pure oil state.r