Vol.23, No.1, 2023, pp. 49–54
UDC:

This study deals with the numerical simulation of a system of vortex turbulent jets impacting a plate by two numerical models of closure of Navier-Stokes equations. The objective is to give a numerical forecast on the jets impacting by the RSTM model and to show the performance of this model. The experimental test bench comprises a diffuser of diameter D, impacting the perpendicular plate, varying the inlet temperature conditions in three configurations (T, T, T), (T/2, T, T/2), (T, T/2, T), such that impact height H = 4D. The swirling is obtained by a generator (vortex) of compound 12 fins arranged at 60° with respect to the vertical placed just at the outlet of the diffuser. The temperature of the swirling jets blowing on the plate is measured with a portable thermo anemometer device VELOCICALC PLUS, in different stations. The system has been digitally simulated by Fluent© /11/, using a turbulence model (k-). Note that the diffuser having balanced inlet temperatures (T, T, T), gives a better uniform distribution of temperature and speed over the surface of the plate compared to those of other configurations. This homogenization of temperatures derives from better thermal transfer of the plate. The model (k, ) gives acceptable results that coincide with the experiment.

Keywords: turbulent swirling jet, impinging a plaque, thermal homogenization, ventilation, (k-) model