Application On Airflow Detection And Simulation Of Wood Drying Kiln Based On Computational Fluid Dynamics

Wood is one of the most popular engineering materials. Wood drying is a strong coupling, nonlinear and complex dynamic system, and external interference and model uncertainty exists during the drying process. So how to create an effective model of drying is an important foundation study of wood drying, and it is also the pre-condition of realizing full automatic control of drying, improving drying quality, reducing energy consumption and reducing the drying time. The operating procedure of a certain species of wood drying, when the other factors that affect the drying rate (such as temperature, humidity, plate thickness) is relatively constant, the air flow and the timber dry has some relations. The airflow velocity is also an important factor of wood drying, so the correct selection of airflow velocity, not only has to the drying velocity and the drying quality affects greatly, moreover may cause the energy consumption to reduce large scale.The distribution of air speed and the influence factors of it in the laboratory-type wood drying kiln were studied in this essay and a discussion on the importance of airflow velocity factor to the wood drying kiln is conducted for developing improved designs with respect to ventilation efficiency. In his paper, CFD (Computational Fluid Dynamics) method will introduce modeling and simulation of wood drying kiln research. Three dimension model of wood drying kiln is simulated used commercial using software of FLUENT. The computation gives related computing velocity field. With results of simulation compared with experimental data have done, the feasibility and veracity of numerical simulation by software of FLUENT to wood drying kiln is validated. Then internal air velocity distributions are forecasted, meantime different airflow velocities which the fan given are analyzed. Besides, it is also discussed the average airflow velocity v,mean square errorσand coefficient of variation V in different conditions, further comparative analysis of the wood drying kiln in the best airflow velocity indicators.The results indicate that experimental data by comparison with the simulation results to verify the established CFD method of wood drying kiln of the feasibility and accuracy. Therefore, the CFD model can be used for different stages of drying rate, temperature, humidity and pressure field simulation study. Through the comparison of the various conditions calculation and analysis, when airflow velocity is 3m/s,the coefficient of variation is smaller and the airflow distribution is better. Therefore, comprehensive consideration of various factors that the defiance of established laboratory-type wood drying kiln model, the condition 4 (then a given wind velocity 3m/s) for the optimal situation in the seven research conditions. The simulation results of the wood drying kiln fan for a given wind velocity there is some reference and selection guide, then optimal control of wood drying and improving the technological level of energy-saving drying kiln. And for wood drying kiln temperature and humidity in different kiln drying time and speed information detection and simulation provides a new way.