Study of the scavenge pump performance for two-phase flow in an aircraft engine lubrication system

The proper functioning of the scavenge pump is a crucial foundation for maintaining the normal circulation of the lubrication system, with its performance and reliability directly impacting the safety of aero engines. This paper focuses on studying the two-stage scavenge pump, establishes the scavenge pump flow performance test system under oil-air two-phase medium, and conducts experimental research on the flow rate performance under relative 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. This article obtains the effect of inlet pressure, outlet pressure, oil-air ratio and rotational speed on the flow characteristics and volumetric efficiency of the oil pump through experiments.