基于多相流耦合过程数值模拟的茶鲜叶离心式连续脱水设备参数模拟与优化

Study on Parameter Optimization of Centrifugal and Continuous Dewatering of Tea Leaves Based on Numerical Simulation of Multiphase Flow

为提高离心式水洗茶鲜叶脱水率并实现连续脱水,本研究基于离心式脱水原理,引入风道吹风提高茶鲜叶在脱水过程中的离散度,采用离散场—流场的多相流耦合技术,对茶鲜叶离心脱水过程进行数值仿真模拟,对影响茶鲜叶脱水效果的因素进行研究。研究表明,在确定送风方向的基础上,发现在由离心筒内向外送风的情况下,离心筒与螺旋推进器驱动轴的旋转速度差对脱水效果的影响最大,离心筒转速对脱水效果影响次之,风速对脱水效果影响相对较小。

In order to improve the dewatering rate and achieve continuous dewatering,a concept of increasing thedispersion of tea leaves through venting,and using the multiphase flow coupling technology of discrete field-flowfield was introduced based on the centrifugal dewatering principle.The centrifugal dewatering process of fresh tealeaves was numerically simulated and verified by experiments to determine the factors affecting the dewatering rate.It was found that the difference of rotational speeds between centrifugal barrel and spiral body had the greatestinfluence on the dewatering effect in the case that the direction of blowing air was outward from the centrifugalbarrel.The centrifugal speed ranked the second on the dewatering effect.The speed of wind had the least effect onthe dewatering effect.