Spinning Workshop Of Large Space Air Flow Numerical Simulation

The spinning workshop of textile industry is a typical large space and multi heatsource construction. The air conditioning system of supply air parameters varies withthe seasons and the outdoor temperature and humidity conditions. In this paper, as anexample for a spinning workshop of textile mill in Xi’an, using computational fluiddynamics software CFD analysis of spinning workshop’s changes with different airdistribution situation of the temperature field and velocity field.In this paper, combining theoretical analysis, numerical simulation and practicaltest method. On the basis of theoretical analysis, putting forward reasonableoptimization scheme of numerical simulation, contrasting experimental data withsimulation results, providing the basis for the design of this kind of large space airconditioning system.When spinning machine is operating, the process exhaust will take away part ofheat, testing and calculating determine the heat transfer coefficient of spinningmachine to make sure actual heat of the spinning machine and providing heatparameter for spinning machine model.According to the heat characteristics of spinning machine and spinning workshopairflow, determining k-e two equation model for turbulence model, considering heatbuoyancy force effect of the boussinesq hypothesis and the treatment of wall surface.Establishment of model and mesh generation, taking into account the process exhaustof spinning machine, not simply to heat source from surface and entity. The spinningmachine is divided into three parts to establish model in this paper, upper and lowerdefined as solid heat source. Central part set as heat source in hollow with a processexhaust passage. The model can realize the process exhaust and take away partmachine waste heat.Spinning workshop is a typical large space and multi heat source construction,this paper simplifies the process of simulated region. The computational domain issimplified into the1/4one according to workshop equipment and air outlet layout issymmetrical, reduces the computational mesh number and calculate time. Bycomparing the simulated of two airflow in spinning workshop on upper send side return airflow and upper send below send airflow, the results show that, the returnwindow of upper send side return airflow only set in one side of the workshop, the airin the workshop which is far from the window for return air will appear return adversephenomenon and heat accumulation phenomenon, the air in the workshop is relativelyconfused because of the effect of the return air flow. The upper send below sendairflow can get stable flow field, especially the wind speed and temperature in theworking area can reach the technical requirements. On the basis of further analysis ofvariation of temperature field and velocity field in the workshop in different airtemperatures and air velocities. Providing reference of air supply quantity in spinningworkshop in different seasons and outdoor conditions of temperature and humidity.Finally, through the testing of spinning workshop of textile factory in Xi’an,including temperature and velocity compared with the simulation results. The resultsshow that, in addition to individual differences from test location and simulationresults, other measured value in measuring point is close to simulation value, thismethod was verified the reliability and validity of selection from physical model andmathematical simulation. And compares the improved flow field of the upper sendside return airflow case with the preliminary simulated design, obtains the results thatincreasing volume of air flow, reducing the air-inlet size and increasing the quantityof air-inlets can increase the work areas of air-inlet and effectively control thetemperature of working area.