大型储罐旋转射流搅拌器数值模拟

Numerical Simulation on Rotary Jet Mixer of Large Storage Tank

原油在大型储罐的储存过程中,会出现罐底油泥沉积等现象。旋转射流搅拌器依靠自身的旋转喷射,对储罐起到全方位搅拌作用。利用CFD软件对装有旋转射流搅拌器的大型储罐进行研究,分析不同喷射速度下流场的流态分布,确定搅拌器最合理的喷射速度。射流在前进过程中不断向周围扩散,能量损失大,沿轴向速度衰减迅速,在4种喷射速度下,喷嘴出口1 200 mm范围内,速度衰减大于70%,之后速度衰减变缓慢。随着射流速度的增加,搅拌效果不断提高,30 m/s为最佳喷射速度。

There will be sludge deposition at the bottom of large storage tank in the storage of crude oil. Rotary jet mixer relying on its rotating jet, plays a role in mixing tank all-di-rections. Using CFD software to study the large storage tank equipped with rotary jet mixer, analyze fluid flow distribution at different jet velocity,and then ensure the most reasonable jet velocity of rotary jet mixer.In the forward process ,the jet continue to spread around,en-ergy loss greatly , and the axial velocity decay rapidly . In four kinds of jet velocity , 1 200mm in the range of nozzle exit, the velocity attenuation is greater than 70%, then the velocity attenuation is slow. With the increase of the jet velocity, the mixing effect is im-proved greatly,and 30m/s is the optimum jet velocity.