A novel dynamic heat-flow coupled model under spray lubrication for high-speed gears: CFD simulation and experimental validation

This paper proposes a novel heat-flow coupled model under spray lubrication to investigate the heat dissipation for high-speed gears. The heat flux is solved considering the dynamic loads and is imposed on the heat-flow coupled model boundary. The loading path performed from two steps (intermittent and spatial discretization). The gear heat dissipation under spray lubrication is validated by a thermal imaging infrared experiment. The developed model overcomes the insufficiency of empirical formula, which can be applied well to predict the heat dissipation for high-speed gears. The lubrication and heat characteristics are discussed under different spray velocities and rotational speeds. The findings demonstrate that the heat transfer coefficient enhances as the increase of spray velocity. The air barrier and high speed that causes the temperature rise extremely complicated. The oil volume fraction is negatively correlated with the heat transfer coefficient under different rotational speeds. The oil volume fraction decreases by 37.4 % and the heat transfer coefficient increases by 54.3 % at the speed of 10,000 r/min.