Induced Ventilation Numerical Simulation In Large Broiler House

Our country is animal husbandry powers and the amount of livestock farming ranks first in the world currently.At present,intensive broiler farms in China exist problems such as the environment is not stable and the concentration of harmful gases is high,good ventilation plays an vital role in solving these problems.The most common ways of the broiler house ventilation are transverse ventilation and longitudinal ventilation,but the two ventilation modes also have their own shortcomings,cannot have a good effect on ventilation,so about the better broiler house ventilation mode still need further research.The aim of this paper is to applay the induced ventilation system into the broiler house which is widely used in the gym,underground parking garage and other large places with good ventilation effect,analyzed the positive role of the induction ventilation system for improving the quality of the henhouse environment.Firstly,based on the finite volume method,the physical model was built according to the actual size of the induced fan,CFD simulation was carride on the velocity field of single induced fan,laid the reliable foundation for subsequent henhouse induced ventilation system of the numerical simulation work.The performance parameters of the induced fan was studied.Suitable tilt angle of the induced fan nozzle was obtained,so did the horizontal and vertical spacing of the two induced fan.Secondly,according to the above results confirmed the physical model and mathematical model of the broiler house induced ventilation system,the velocity distribution of the broiler house was simulated using the HAVC field specialized software Airpak and calculated the velocity,and compared the results with the velocity of the longitudinal ventilation mode.Finally,based on the studying the of the distribution of the velocity,set the heat source and pollution sources boundaries of the broiler house,calculated the temperature and ammonia concentration distribution characteristics under broiler house induced ventilation mode.Also the temperature and ammonia concentration henhouse under the longitudinal ventilation mode was numerical simulated,compared the ventilation effect of the two ventilation modes,which truly reflected the good effect of the broiler house induced ventilation.This paper presents a new way for broiler house ventilation namely the inducd ventilation,and the environmental parameters in the broiler house were simulated numerically,which has important significance for the development of ventilation way in the brolier house as well as CFD in the livestock house.