CAJ | 학술논문

针对滴灌用水力旋流器,采用高浓度混合多相流模型并结合雷诺应力模型和颗粒动力学理论对其内部颗粒体积浓度分布和分离效率进行了数值模拟.模拟首先得到了水力旋流器内不同粒径颗粒浓度分布情况和分离效果,对于小粒径颗粒主要集中在内旋流区域,分离效率较差,而大粒径颗粒集中在外旋流区域,分离效率较高;对于颗粒分离效率,混合多相流模型和欧拉多相流模型的计算结果基本一致:最后分析了旋流器进口速度和浓度变化对颗粒分离效率的影响.计算结果表明,混合多相流模型可用于水力旋流器内高浓度多相流的数值模拟,对滴灌用水力旋流器的选择和结构优化设计具有重要的指导意义.
침대적관용수력선류기,채용고농도혼합다상류모형병결합뢰낙응력모형화과립동역학이론대기내부과립체적농도분포화분리효솔진행료수치모의.모의수선득도료수력선류기내불동립경과립농도분포정황화분리효과,대우소립경과립주요집중재내선류구역,분리효솔교차,이대립경과립집중재외선류구역,분리효솔교고;대우과립분리효솔,혼합다상류모형화구랍다상류모형적계산결과기본일치:최후분석료선류기진구속도화농도변화대과립분리효솔적영향.계산결과표명,혼합다상류모형가용우수력선류기내고농도다상류적수치모의,대적관용수력선류기적선택화결구우화설계구유중요적지도의의.
The mixture multiphase model combined with the RSM(reynolds stress model) and kinetic theory of granular flow for high concentration multiphase flow was used to simulate the particle volumetric concentration distribution and separative efficiency in a hydrocyclone for drip irrigation system. The distribution situation and separating effecting of different diameter particles concentrating the hydrocyclone was obtained. The small diameter particles were mainly distributed in the region of inner vertex and had higher separation efficiency. While the big diameter particles were mainly distributed in the region of outer vortex and had poor separation efficiency. The separative efficiency computed by the mixture multiphase model was in accordance with the Eula multiphase model. Then, the influence of the entrance velocity and concentration on the separative efficiency was analyzed. The simulation results showed that the mixture multiphase model was available for the numerical simulation of multi-phase flow in the hydrocyclone. The results have great importance to the choice and optimal structure designing of hydrocyclone for the drip irrigation system.