Numerical simulation of impinging jet impact on disc heat transfer

This project comprehensively examines the impact of an impinging oil jet on the cooling performance of engine pistons. The primary objective of this research is to assess the significance and effectiveness of this component in the cooling process and the final temperature distribution of the piston. To enhance the accuracy of the simulation, a transient solver is utilized. This method requires simultaneously applying the reciprocating motion to the piston and boundaries as the jet interacts with the piston, which significantly increases the computational time. Therefore, we employ a strategy to minimize time and energy waste. Previous studies suggest that incorporating motion into this simulation has minimal impact on the final results. Due to the complexities and high time costs associated with this simulation, a simpler approach is adopted to determine the fluid properties and their effects on disk cooling. We exposed a stationary disk to an oil jet and investigated the fluid behavior under various conditions. During these simulations, we analyze the effects of different factors, such as nozzle shape, which is found to have a minor effect, oil exit velocity, and distance of the oil exit from the disk on the cooling performance. Furthermore, this study examines the influence of these factors on the radial velocity gradient and their subsequent impact on the heat transfer coefficient and the Nusselt number, which are found to be critical aspects of this research.

کلیدواژه ها:

Impinging oil jet ، disc cooling ، radial velocity gradient ، heat transfer coefficient ، Nusselt number