一种可用于微吹吸流动控制技术研究的孔隙壁模型

A micro-porous wall model for micro-blowing/suction flow system

基于微尺度管道流动的渐进解析解,并借助多孔介质渗流理论的Darcy定律,建立了可应用于微吹/吸技术(Micro-Blowing/Suction Technique,MBST)数值模拟研究的微孔壁吹吸流动系统模型(包括微孔壁孔隙流动模型及若干空穴流动模型),并对模型修正系数进行了标定.给出应用微孔壁吹吸流动系统模型进行主动、被动控制的数值模拟耦合迭代方法.作为验证,以NASA格伦中心的微孔蒙皮为对象,应用建立的微孔壁吹吸流动系统模型,开展了主、被动微吹吸阻力控制的数值模拟研究.相对于局部流场详细数值模拟的阻力估算结果,采用微孔壁及空穴流动简化模型的阻力计算结果有明显的改善.研究成果为MBST技术的减阻理论研究提供了有效的手段.

A theoretical model pertaining to the macro-scaled collective characteristics of a porous wall composed of micro-channels is formulated based on the asymptotic analysis, in conjunction with the Darcy＇s law in theory of porous media flows, which can be introduced into numerical simulation study of Micro-Blowing/Suction Technique （MBST）. Then, the model correction coefficient emerged into the micro-porous wall model is correlated and calibrated via detail simulations. And a numerical procedure for solving the micro-blowing/suction flow system （a coupled micro-porous flows and cavity flow models） and the macro-cross flows are formulated. The model coupling the micro-porous wall flow and cavity flow beneath the wall is applied to conduct numerical parametric studies on the skin friction management on NASA＇s micro-porous skin subject to active or passive micro-blowing/suction. By comparing with experiment results, the numerical results behave similar trends, and give better drag reduction capacity with little departure from experiment data as compared to results obtained by the detail numerical simulation An effective approach is obtained for theory research of MBST as a result.