Influence and optimization of dual-orifice jet nozzles on oil capture performance of under-race lubrication with a radial oil scoop for high-speed bearings in aero-engine.

This article investigates the influence of dual-orifice jet nozzles on oil–air flow dynamics and oil capture performance in under-race lubrication systems for high-speed aero-engine bearings. Using a combination of experimental setups and three-dimensional computational fluid dynamics (CFD) simulations, the study reveals that flow interference between orifices causes the dual-orifice nozzle's oil flow rate to be less than twice that of a single-orifice nozzle, with an optimal orifice spacing maximizing oil capture efficiency. A regression response surface model coupled with a multi-objective particle swarm optimization (MOPSO) algorithm was developed to optimize design parameters, achieving oil capture efficiency improvements exceeding 16% while maintaining precise oil supply. The findings provide valuable insights for enhancing lubrication and cooling performance in high-speed bearings, contributing to improved aero-engine reliability and reduced power loss.