改善平板风致静力的定常吸气方法

The method of steady air-suction used to improve the wind-induced static effect on a slab

采用基于CFD(Computational Fluid Dynamics)的数值方法研究了定常吸气方法对平板风致静力的影响。研究对象选为一处于均匀来流风场中的平板模型,在该平板靠近来流端设置定常吸气入口,通过改变定常吸气系数和吸气模式计算该平板模型的风致静力三分力,进而获取定常吸气对平板风致静力作用的影响。风场数值模拟采用RSM(Reynolds Stress Equation Model)湍流模型。计算结果表明,在定常吸气作用下平板的阻力系数显著降低,扭矩系数增大;平板迎风端面的压力随着吸气能量的增强而减小,背风端面的压力基本不变。数值结果表明:定常吸气可以有效地改善平板绕流边界层结构,降低风致阻力。

In the paper the wind-induced static effect on slab with air-suction is studied by the numerical simulation based on Computational Fluid Dynamics （CFD）. The object is a slab model located in an even wind flow field. There is an air-suction hole that is close to the wind inflow on the undersurface of the slab. In order to obtain the wind-included static effect on the slab affected by the steady air-suction, the three components of the static force is calculated in the conditions with the air-suction coefficients and models changing. In simulation,the Reynolds Stress Equation Model （RSM） turbulent model is adopted for solving the governing equations. The results show that the drag coefficients were decreased observ- ably and the moment coefficients were increased. The results also show that the pressures of the wind- ward surface of the slab were decreased with more and more suction energy supplying while the pres- sures of the leeward surface of the slab were almost the same. The numerical results indicate that the steady air-suction can improve the structure of the boundary layer of the wind flow around the slab effec- tively and reduce the wind-included drag force.