水肥一体化中水肥混合效果数值模拟研究

为研究水肥一体化技术中的水肥混合特性,以流体力学中的两相流理论为基础,针对水肥混合过程中混合时间、混合区间长度、流速及管径对其混合效果的影响进行相应的数值模拟研究。结果表明,混合时间及混合区间长度越长有利于提高水肥混合效果及最终水肥混合均匀性;水肥流速比较低时管内水肥混合的均匀性较好,且水肥流速越大则其混合效果及均匀性越好;水肥流速较低时输水管及输肥管的管径比对水肥混合均匀性的影响较大,两者管径比越小则混合效果越好,随着流速的提高两者管径比对其混合效果的影响逐渐减弱。

Numerical simulation of the mixing efficiency of water and fertilizer solution infertigation

Fertigation technology is a new agricultural technology,which could enhance the utilization rate of water and fertilizer and increase the yield of crops.This study was focusing on the mixing characteristics of water and fertilizer solution in fertigation technology.The influences of the mixing time,length of the mixing interval,flow velocity and pipe diameter on the mixing efficiency were simulated based on the two-phase flow theory in fluid mechanics.The results indicated that the longer mixing time and mixing interval,the better the mixing efficiency and the final uniformity of water and fertilizer solution.The uniformity of mixture was better when the velocity ratio of water and fertilizer solution was small,and the mixing efficiency was higher under the larger flow rate of water and fertilizer solution.In addition,the influence of pipe diameter ratio of water pipe and fertilizer pipe on the mixing efficiency was greater when the flow velocity was low.And the smaller the pipe diameter ratio was,the better the mixing performance was.It''s influence was weakened gradually with the increase of flow velocity.