Numerical determination of the supply of air terminal characteristics
Problem statement. In the calculation of air distribution data on the jet characteristics obtained experimentally are used. It is also considered that the distribution of the flow characteristics at the air nozzle outlet is equal or symmetrical, which is usually not the case. The methods of determining the kinematic and thermal coefficients of air nozzle outlets, based on the calculation of flow parameters using Fluent software are proposed. Methodology is illustrated in example of calculating the coefficients for the jet stream from slot orifice located in the wall of the duct among the other consistently placed slots. Taken into account the uneven velocity fields, static pressure, excess temperature in the supply orifice. Results. Within the proposed methodology defined kinematic coefficient of air nozzle outlet, profiles of longitudinal velocity in the cross-section of the jet, as well as the angle which amounts with a duct forming the direction of the jet expiration. The facts of the absence of longitudinal velocity profiles similarity in the jet cross-sections in the main region of the jet, the presence of excess static pressure field on expiry are determined. Conclusions. The computational definition of kinematic and thermal characteristics of the air terminals is possible. The results indicate the need to adjust the approaches to the analysis of turbulent jet flows.