Interdisciplinary approach to high Reynolds number turbulence

（1）理论将统计湍流理论中的多点脉动相关方程分解为单点方程，从而使之适用于实际感兴趣的湍流。对于不可压混合层和湍流预混火焰，得到了该方程的孤立波解。湍流强度，雷诺应力和湍流火焰速度从这个解决方案，而无需求助于任何经验常数，并与现有的实验（Tsuge）的良好协议。讨论了具有自由表面和对流速度的波的绝对和对流不稳定性。利用Floquet定理（Kyotoh）得到了空间周期流的稳定极限.（2）计算流体力学中，采用涡量法（不可压缩）和有限体积法（可压缩）处理高雷诺数混合层。讨论了可压缩性的影响和一种新型的湍流边界层主动控制装置（井上）。非稳态加热的数值预测 关于我们 本文用二维薄层Navier-Stokes（Asou）方法计算了壁面反射激波引起的激波速度。对代数RNG模型进行了改进，使其适用于Garabedian-Korn剖面，并与Baldwin-Lomax（中村）模型进行了比较，结果表明，改进后的模型与Baldwin-Lomax模型具有较好的一致性。在计算机翼低头姿态的旋涡脱落时，必须考虑湍流模型中的非平衡效应。对脉冲射流燃烧的分析表明，由于斜压与火焰本身产生的压缩波的相互作用，火焰表面有相当大的变形。提出了一种三阶多方向迎风差分格式。它适用于具有复杂几何形状的高雷诺数非定常流，具有令人满意的精度（Kahara）。（3）实验确定了在强剪切和火焰拉伸作用下的火焰稳定机理（Niioka）。研究了平板/凹板边界层的转捩，发现纵向涡与外层湍流斑（平板）之间存在一个反馈系统，并且存在三种湍流模式（Gortler涡）（Aihara）。开发了一种四时间跟踪装置，通过将图像处理中的频闪发射控制为6 msec（Nishikawa），来实现计算流速的算法。通过激光多普勒测量热逆流射流（Murakami），阐明了超流He中湍流转捩和T_1-T_2转捩的证据。混合层中相干结构的初始阶段在很长的流向范围内持续存在（铃木）。研制了高分辨率测量装置，并应用于湍流凝胶中CO_2浓度（瑞利散射）和火焰中OH荧光（LIF）的测量。本文研究了锐/钝尾翼产生的三维激波与湍流边界层的相互作用以及弓形激波与湍流边界层的相互作用。观察到边界层以几kHz的频率重复二次分离/附着。少

(1)THEORYMulti-point fluctuation-correlation equations of the statistical turbulence theory are separated into single-point equations, thereby made applicable to turbulent flows of practical interest. The solitary-wave solution of the equation is obtained for incompressible mixing layrs and turbulent premixed flames. Turbulence intensity, Reynolds' stress and turbulent flame speed are obtained from this solution without having recourse to any empirical constants, and in good agreement with existing experiments(Tsuge). Absolute and convective instabilities of waves with free surface and convection velocity are discussed. Stability limit of spatially periodic flow is obtained using the Floquet theorem(Kyotoh).(2)CFDHigh Reynolds number mixing layr is dealt with using vortex method(incompressible) and finite volume method (compressible). Effects due to compressivility and a novel active control device of turbulent boundary layr are discussed(Inoue). Mumerical prediction of unsteady heatin … More g caused by wall-reflected shock waves is made using 2-D thin layr Navier-Stokes formalism(Asou). Algebraic RNG model is improved to make it applicable to Garabedian-Korn profile and the result shows good agreement with Baldwin-Lomax model(Nakamura). It is necessary to incorporate nonequilibrium effect on turbulence modeling in computing vortex shedding in the nose-down posture of a wing(Fujii). Analysis of pulse jet combution shows considerable distortion of the flame surface due to baroclinic interaction with compression waves emerging from flame itself(Hayashi). A method of third order multi-directional upwind finite difference scheme is proposed. It is applied to high Reynolds number unsteady flow with complex geometry with satisfactory accuracy(Kuwahara).(3)EXPERIMENTSMechanism of flame-holding in the presence of strong shear and flame-stretching is identified(Niioka). Transition of flat/concave-plate boundary layrs are investigated, and it is found that there is a feed back system between longitudinal vortices and outer-layr turbulent spots(flat-plate), also that there are three types of turbulence mode(Gortler vortices)(Aihara). A four-time tracking device is developed to materialize algorism to compute flow velocity by controlling stroboscopic emission in the image processing to 6msec(Nishikawa). Evidence of transition to turbulence and T_1-T_2 transition in super-fluid He is clarified through the laser-doppler measurement of thermal counter flow jets(Murakami). Initial stage of coherent structure in the mixing layr is shown to persist over a long streamwise range(Suzuki). High resolution measurement devise is developed and is applied to measuring CO_2 concentration in turbulent jel(Rayleigh scattering)and OH fluorescence in flames(LIF)(YOSHIKAWA). Interactions of utrbulent boundary layr with 3-D shock waves generated by sharp/blunt fins also with bow shock waves are investigated. It is observed that the boundary layr repeats secondary detach/attach-ment with frequencies of several kHz(Asou). Less