气固两相锥体绕流的数值仿真研究

Numerical simulation of gas solid two phase flow around a cone

为了运用有限元法来研究锥体在气固两相流中的承载受力和对流场的影响,运用FLUENT流体仿真软件,选择Eulerian模型,把气体和固体颗粒当成单独两种流体计算,并结合标准k-ε湍流模型,有效解决各种压力梯度下边界层流问题的计算,对气固两相流场中锥体及流场情况进行仿真,根据不同粒径的气固两相进行了对比试验。结果显示,随着气相速度增加,锥体尾部回流涡会短,锥体壁面上流场的速度梯度和周围流场压力梯度增大,流场湍动能及其增量增加;随着固相粒径的增大,锥体附近流场的压力梯度、速度梯度、锥体尾部涡流量和湍动能增量都增大,但湍动能增量的变化速率变慢,仿真结果与实际结果基本一致。

In order to study the bearing capacity of cone in gas-solid two-phase flow and the influence of convection field by using finite element method,this paper uses fluent fluid simulation software,selects Euler model,calculates gas and solid particles as two separate fluids,and combines with standard k-ε turbulence model to effectively solve the calculation of boundary laminar flow under various pressure gradients,The cone and flow field in the gas-solid two-phase flow field are simulated,and the comparative tests are carried out according to the gas-solid two-phase with different particle sizes.The results show that with the increase of gas phase velocity,the reflux vortex at the tail of the cone will be shorter,the velocity gradient and pressure gradient of the flow field around the cone wall will increase,and the turbulent kinetic energy and its increment will increase;With the increase of solid particle size,the pressure gradient,velocity gradient,vortex flow and turbulent kinetic energy increment near the cone increase,but the change rate of turbulent kinetic energy increment slows down.The simulation results are basically consistent with the actual results.