Numerical simulation of large storage tank cleaning nozzles

FANG Zhou, YANG Jianfeng, LIU Wenbin
（Chemical Safety Engineering Research Center of Ministry of Education,
Beijing University of Chemical Technology, Beijing 100029，China）

Abstract: Aiming at the problems that jet divergence is serious, the effective target distance is short and cleaning effect is poor in the process of mechanical cleaning of oil tank, a new type of nozzle which has center cylindrical was investigated. The numerical simulation of the flow field inside and outside the tank cleaning nozzle with center cylinder was carried on with the software of Fluent, the Kεturbulence model was used to establish a mathematical model. The water jet structure was simulated by fluent arithmetic .The effects of nozzle which has a center cylinder and cylindrical nozzle were evaluated on the Mixture multiphase flow model and unstructured mesh which used simulation evaluation. The results indicate that the speed of the nozzle with the center cylinder increases gradually along the stream direction, the jet does not divergence within the computational domain and the target distance is improved effectively. The exit jet radius of nozzle which has center cylinder is reduced by 13.7% compared with the cylindrical nozzle and the bunching of the jet is improved as well as the hitting power is better kept, so that it can meet the requirements of large storage tank cleaning better.
Key words: nozzle; water jet; center cylinder; numerical simulation