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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。
Aiming at the problem of uneven distribution of pressure field caused by centrifugal acceleration in multi-parameter composite environmental testing system, a method of adding fan stirring to improve the distribution uniformity of pressure field is proposed. By studying the coupling mechanism of centrifugal acceleration and pressure field, the fluid motion model in environment chamber is established based on the fluid motion control equation and standard k ~ ε turbulence model. The finite volume numerical analysis method was used to simulate the distribution of pressure field under both fan-free and fan-agitated conditions. The effect of fan agitation on the distribution of pressure field was studied. The results show that the centrifugal acceleration has a great influence on the distribution of pressure field in the cabin without the fan-stirring effect. After the fan is stirred, the distribution of the pressure field in the cabin can be effectively improved. When the fan velocity v is small, the effect of increasing the pressure field distribution is more obvious. However, when the fan velocity is large enough, the effect of improving the pressure field distribution will not be obvious if the fan velocity v is increased.