Numerical study of a three swirling jets system impacting a plane plate

摘要

This investigation deals with a numerical simulation of a multiple swirling jets system impacting a plane plate. The studied configuration composed of three diffusers arranged in line, with diameter D and the gap between the axes of their centers are fixed to 2D. The height of impact is fixed to 4D, impacting the plate perpendicularly. The swirling jet is generated by swirler system composed of 12 vanes inclined by the angle of 60 degrees relative to the vertical position just outside of the diffuser. The velocity and the temperature of the air flow are fixed in the inlet of diffusers. The objective of this work is to identify the factors that may influence the efficiency of the ventilation performance, such as the jet configuration and the impact height. The studied configuration was numerically simulated by the finite volume method. The equations systems have been closed with the turbulence model (k-epsilon). In general, the prediction of the flow field is in better agreement with the experimental data. The results obtained show that the studied parameters have significant effects on the flow characteristics and behavior of multi- jet impinging. The configuration of three jets with a 4D impinging height has given a good development of the jet and an almost uniform temperature along the plate with the input temperature conditions in the diffusers (T, T, T).