Jet turbulent à diffuseur muni de lobes : Application au confort dans les locaux à usage d'habitation

• Published in: Revue Nature et Technologie (En ligne) 2015-06 (13), p.34
• Main Authors: Bennia, A, Loukarfi, L, Khelil, A, Braikia, M, Rahal, S, Bouhamidi, Y
• Format: Article
• Language: English
• Subjects: Aircraft; Homogenization; Studies; Vortices
• ISSN: 1112-9778; 2437-0312

In this work, we present an experimental study of a turbulent jet diffuser equipped with lobe, applied to winter comfort premises for residential use. The objective is to improve the efficiency of the distribution of air in the occupied zone at low cost by a passive means of controlling the flow of the engine ventilation. The experiments were performed in a room of dimensions 3.0m long, 2.5m wide and 2.5m high. These dimensions make it possible to achieve the best tests in conditions of free and hot vertical jet unfavorable thrust forces. The local has been isolated from the external environment during experiments. In the absence of control of the thermal conditions at the walls of the room, the ambient temperature is not kept constant. The jet temperature differential / atmosphere is still controlled by adjustment of the jet air temperature. This results in the conservation of the number of the jet Archimedes during testing. The installation realized is composed of a frame on which is fixed the blowing device. The latter includes blowing hot air diffusers directed from top to bottom. The temperatures and flow rates were measured by a multifunctional thermo-anemometer. The probe is supported by guided rods vertically and horizontally to scan the maximum space. A comparative study of the performance of different nozzle geometries was conducted. By analyzing the axial temperature profiles of the jet for 20 equivalent diameters, the comparison between the diffuser lobbed more flared opening and low height and diffuser with and without turbulence shows that the lobed jet blowing in similar conditions ensures better radial temperature stability while the swirling-jet 60 ° tilt angle can best flourish radial temperatures.