The Study Of Numerical Simulation And Experiment Of Wall-Attached-Jet Flow On Single Side Heated Wall

With the continuous development of the technology, people's requirements for the construction of the energy-saving and comfort constantly improve. The method that achieved the purpose of energy saving through changing the air supply mode is gaining more and more attention from the academia. In this study, the model of the experimental system of the wall-attached-jet flow on single side heated wall was built. The studies were being carried out in condition with a single-vertical heated wall, explore the influences of the factors of velocity of plasma jet, inlet size, outlet position, calorific value of the wall etc. to plasma jet and indoor thermal environment.According to the experimental conditions of the model of the experimental system of the wall-attached-jet flow on single side heated wall, use ANSYS-CFX software for numerical simulation, study change law of the velocity and temperature fields, explore the variation characteristics of the jets penetration distance and indoor thermal environment. According to the model of the experimental system of the wall-attached-jet flow on single side heated wall, similarity ratio was derived, use the experimental model to simulate the the wall-attached-jet flow on single side heated wall, further explore the influencing factors of the jets penetration distance. The experiment data and numerical simulation were compared, the reliability of the model laboratory stage and numerical simulation were demonstrated. Apply the multivariate linear regression forecast models, on the basis of previous research, formulae the empiric formulas of the jets penetration distance and analyze human thermal comfort under different laboratory conditions. Through experimental research and numerical simulation the vertical wall jet with single heated, under this experiment condition, draw the following conclusion:1) By the demonstration and analysis, the model test bed stand in this paper could be used to study the process of the wall-attached-jet flow on single side heated wall,and it could be used to study the indoor thermal environment and thermal comfort of human body by wind pressure and thermocompression fluid-structure interaction.2) By numerical simulation and experimental studies, analyze, summarize and sum up the effect of the air velocity, air temperature, inlet size, inlet position, heat of single wall and outlet position on the heated jet depth, indoor thermal environment, human thermal comfort and energy efficiency;3) In case that the other parameters remained unchanged, with the increase of air velocity, the jets penetration distance ?? increased. When the wind speed reached 0.6m/s, the jets vertically arrived at the bottom of the indoor room. The indoor average wind speed gradually increased, the indoor temperature gradually decreased. Predicted Mean Vote (PMV) in the work area continually decreased. Predicted Percentage Dissatisfied (PPD) firstly decreased, and then increased. When the wind speed was 0.4-0.5m/s, the PPD value reached the minimum value, energy efficiency was all greater than 1, which firstly increased, and then decrease. It reached the maximum value when the wind speed was 0.5m/s.4) With the increase of air temperature, the jets penetration distance 5^ firstly increased, and then decrease. The indoor temperature of the model room showed globally an rising trend, the indoor average wind speed showed little change. Predicted Mean Vote in the work area continually increased. PPD firstly decreased, and then increased, energy efficiency was all greater than 1, which firstly decreased, and then increased.5) With the increase of inlet size, the jets penetration distance ?? increased. In general, the indoor temperature of the model room continually decreased. The indoor average wind speed showed an rising trend. PMV in the work area continually decreased. PPD firstly decreased, and then increased. Energy efficiency was all greater than 1, which firstly decreased, and then increased.6) In the designed range, with the increase of the distance between slot diffuser width and heated wall, the jets penetration distance ?? decreased. The indoor temperature of the model room and the indoor average wind speed showed little change. PMV in the work area increased, PPD had risen a bit. When the distance was 0.015m, the jets air changed direction after entering the room.7) With the increase of the heat of the wall, the jets penetration distance ?? decreased. When the heat of the wall reached 170W/m2, the jets changed direction after entering inlet. The indoor temperature of the model room continually increased, the wind speed globally showed little change. PMV in the work area continually increased. PPD firstly decreased, and then increased, energy efficiency was all greater than 1, which firstly increased, and then decrease.8) When the outlet was in the upper room, the jets penetration distance So was smaller, however, PMV in the work area, PPD and energy efficiency were better than the situation when the outlet was in the lower room9) Apply the theorem of Buckinghanmand the multivariate linear regression forecast models, formulae the empiric formulas of the jets penetration distance and analyze human thermal comfort under different laboratory conditions:In a real application, in order to improve human comfort and saving energy, it can accord the adjust conclusions for different situations inlet slit width and air speed.