Mathematical Simulation of a Twisted Inlet Jet at Variable Mode with Using Various Turbulence Models

Abstract

The article is devoted to the solution of actual task – the efficiency increasing of the air distribution using twisted and wall air jets to provide normative air parameters in premises . The purpose of the paper is to determin e the characteristics of air flow that is formed by twisted and flat wall jet s at alternating air flow and to obtain analytic equations for determining of needed dynamic parameters of the air jets, and also to design the mathematical model of incoming air flow at the alternating air flow . The mathematical model of air supply with twisted and wall air jets is improved. It is shown that for reaching the maximal efficiency of air distribution it is necessary to supply air by jets that intensively decay before entering into a working zone . Simulation of air flow was carried out using the computational fluid dynamic software Ansys FLUENT. Simulation of the flow are carried out by one-parameter Spalart-Allmaras turbulence model and two-parameter k –e turbulence model. Good coincidence between the results of simulation using both tur b ulence models is obtained. The graphical and the analytical dependences on the basis of the conducted experimental research, which can be used in subsequent engineering calculations, are shown. Dynamic parameters of air flow that is formed by t he twisted and wall air jets at alternating air flow has been determined. New 4D method of researches is proposed for researching of jets with alternating parameters of the air. Results of experimental investigations of air supply into the room by air distribution device which creates twisted air jets for obtaining more intensive turbulization of air flow in the room are presented. Obtained results of these investigations give possibility to realize engineer ing calculations of air distribution with twisted and wall air jets.