壁面温度控制对平板边界层影响的数值研究

发布时间：2019-04-15 23:52

【摘要】：通过对零压力梯度的平板边界层流动施加温度控制,展开壁面温度控制对平板层流边界层和湍流边界层影响的研究,探索温度控制对平板转捩雷诺数和壁面摩擦阻力的影响规律。采用带有转捩模式的三方程湍流模型对平板边界层流动进行数值模拟,重点考察了壁面摩阻系数、平板转捩雷诺数、湍流边界层流动随壁面温度变化的规律。计算结果表明在壁面温度从288K增大到432K时,边界层转捩雷诺数增大约36%,表面摩擦阻力减少约9.6%。研究分析表明:加热控制使层流区域温度边界层内粘性作用增强,雷诺切应力和湍动能减小,流动更加稳定;而湍流区域边界层内粘性底层中速度梯度和粘性切应力减小,导致壁面处摩擦切应力减小。因此壁面加热控制可以延迟边界层转捩,减小湍流区摩阻系数,并减小平板摩擦阻力。
[Abstract]:The influence of wall temperature control on laminar boundary layer and turbulent boundary layer is studied by applying temperature control to the flow of plate boundary layer with zero pressure gradient. The influence of temperature control on Reynolds number and wall friction resistance of plate transition was investigated. A three-equation turbulent model with transition model is used to simulate the boundary layer flow in a flat plate. The variation of wall friction coefficient, Reynolds number of plate transition and turbulent boundary layer flow with wall temperature are investigated. The results show that when the wall temperature increases from 288K to 432K, the Reynolds number increases by 36% and the friction resistance decreases by 9.6%. The results show that heating control increases the viscosity in the temperature boundary layer of laminar flow, decreases the Reynolds shear stress and turbulent kinetic energy, and makes the flow more stable. However, the velocity gradient and viscous shear stress in the viscous bottom of the turbulent boundary layer decrease, resulting in a decrease in the friction shear stress at the wall surface. Therefore, the wall heating control can delay the boundary layer transition, reduce the friction coefficient in the turbulent region, and reduce the friction resistance of the plate.
【作者单位】：中国商用飞机有限责任公司民用飞机试飞中心;
【分类号】：V211

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