Abstract
A large amount of experimental data on no-load power losses is still available at FZG, resulting from several years of tests [11], with either single discs, single gears and two meshing gears immersed in oil, and this data cover the influence of several parameters like tip diameter, face width, helix angle, temperature and oil type. In order to improve the understanding of the mechanisms involved in hydraulic losses, CFD simulations have been performed in order to investigate the effect of the same parameters and the numerical results have been compared with the available experimental results. In the first phase of the activities, which is presented in [15], single discs and gears have been considered. The quite good accordance between CFD simulation and experimental tests has confirmed that CFD represents an effective approach to study windage power losses. In this paper, the effect of the tip diameter, the face width and the rotational speed on the hydraulic losses (windage + squeezing) on two meshing gears have been investigated by means of CFD simulations and validated with experimental data. The results appear in good agreement.