基于FLUENT的离心加速度下气压场仿真研究

Simulation of pressure field under centrifugal acceleration based on FLUENT

针对多参数复合环境试验系统中离心加速度会造成气压场分布不均匀的问题,提出了一种添加风扇搅拌来改善气压场分布均匀度的方法。通过研究离心加速度与气压场的耦合机理,以流体运动控制方程和标准k～ε湍流模型为基础,建立了环境舱内的流体运动模型。采用有限体积数值分析的方法,对无风扇搅拌和有风扇搅拌两种情况下气压场的分布进行了仿真,研究了风扇搅拌作用对气压场分布均匀度的影响。研究结果表明,无风扇搅拌作用情况下,离心加速度对环境舱内气压场分布有较大影响;添加风扇搅拌作用后,能有效改善环境舱内气压场分布的均匀度。当风扇风速v较小时,增大v其改善气压场分布的效果越明显;但当风扇风速足够大时,若再增大v则改善气压场分布的效果将不明显。

Considering that centrifugal acceleration will cause the uneven distribution of pressure field in the combined multi-parameter test environmental system,a scheme that adding fan stirring to improve the evenness of pressure field was presented.After the coupling mechanism between centrifugal acceleration and pressure field was studied,a fluid flow model of the environmental chamber was established on the basis of fluid motion equation and standard k～ε turbulence model.The distribution of pressure field was simulated in both cases of fan stirring and no fan stirring with the finite numerical analysis method,and the influence of fan stirring on the even distribution of pressure field was discussed.Research results show that without fan stirring centrifugal acceleration has a greater impact on the distribution of pressure field.On the contrary,the uniformity of pressure distribution will be effectively improved by using fan stirring.When the fan speed is low,the higher the fan speed,the more obviously the distribution of pressure field is improved.However,when the fan speed is high enough,the distribution of pressure field will not be much improved with the increase of the fan speed.