柔性空气室跳汰机气液固耦合动力学行为研究

A project aims at the gas-solid-liquid coupling dynamics behavior of compressed gas, airbag interface, pulsating flow and the jig bed particles inside a flexible air chamber jig. The coupling and relation mechanism for gas-solid-liquid-solid have been revealed clearly. The theoretical basis of design and control for the jig is obtained in order to guide and realize the efficient separation and reliable control.. Firstly, the purpose of finite element calculation of gas-solid coupling model is to explain the action of gas on the airbag nonlinear deformation and damage. According to the experiments of flow-field test and 3-dimensional scanning, the coupling dynamics between gas and airbag is analyzed. Secondly, the relationship between the fluid movement and the airbag nonlinear deformation is obtained according to calculate the liquid-solid coupling model of water and airbag. Basis on the results of ultrasonic detector and PIV testing, the coupling dynamics between water and airbag is obtained. Thirdly，the coupling dynamics model between fluid and solid is solved by the finite element and discrete element method. The dynamic transfer and dissipation of energy is analyzed. The action of water on the motion and separation of particles is researched. The coupling dynamics between water and particles is obtained by high speed dynamic imaging experiments. Finally, the research results will guide the design and control of flexible air chamber jig. These are verified by the feasibility experimental study.

通过研究柔性空气室跳汰机中压缩气体、气囊界面、脉动水流、床层颗粒的气液固耦合动力学行为，揭示气-固-液-固耦合作用机理与运动行为关联机制，获得跳汰机设计和调控的理论依据，指导并实现柔性空气室跳汰机高效分选和可靠调控。. 首先，开展气固耦合模型有限元计算，揭示气体对气囊非线性变形和损伤破坏作用机理，应用流场测试和三维扫描实验，探索气体与气囊的气固耦合动力学行为；其次，通过求解水流与气囊的液固耦合模型，获得气囊非线性变形与水流运动的关联机制，结合液位超声检测和三维粒子图像测速实验，探索水流与气囊的液固耦合动力学行为；再次，借助有限元、离散元方法求解液固耦合模型，揭示颗粒与水流的能量动态传递机制和耗散效应，研究水流对颗粒运动、分层的作用机理，应用高速动态摄像实验研究水流与颗粒的液固耦合动力学行为；最后，指导柔性空气室跳汰机设计与调控，开展可行性实验验证。

通过研究柔性空气室跳汰机中气体-气囊界面、气囊-液面、水流-床层颗粒的耦合动力学行为，揭示气-固-液-固耦合作用机理与运动特征，获得跳汰机设计和调控的理论依据，指导并实现柔性空气室跳汰机高效分选和可靠调控。主要研究包括如下四方面：第一，开展了气固耦合模型有限元计算，揭示了压缩气体作用下气囊非线性变形的形成机理，依据气囊应力应变分布评价气囊安全可靠性；第二，建立了水流与气囊的液固耦合模型，探索了水流与气囊的液固耦合动力学行为，进行了液位超声检测实验研究，探索了水流运动过程中压力、气囊变形的作用；第三，借助有限元、离散元方法建立了液固耦合模型，研究了水流对颗粒运动、分层的作用机理，应用高速动态摄像实验研究了水流与颗粒的液固耦合动力学行为。第四，开展了不同工艺条件下颗粒运动的数值模拟，探索了相关工艺调控参数并进行了实验验证，为柔性空气室跳汰机的调控提供了指导。