Next , aiming at the state of the art in engineering turbulence models , one extended explicit algebraic reynolds stress model to simulate anisotropic buoyant turbulent flows . validation was done using experimental and other numerical results of turbulent thermal mixing in t - junction flows 进一步的，针对当前考虑浮力作用紊流模型的研究现状，导出了适合模拟各向异性的浮力紊流的显式代数雷诺应力模型，并利用t型交叉管内的温度混合试验成果进行了分析验证。
The blade inner channel cooling is a complex convection - conduction coupling problem . this thesis build a three - dimension . compressible turbulence model , and give a general solve method . with the geometrical model of the glossily rectangle straight channel , the rectangle straight channel with in - line arrays disturb plates , the rectangle straight channel with staggered arrays disturb plates , the rectangle straight channel with slant disturb plates , this thesis compute the flow and heat transfer condition when the cold air path though these channels , and gain the temperature field , pressure field , velocity filed , in addition . this thesis also analyze the influence of the different channel height , the different channel materials , the different channels , and gain the function relation between he nusselt number , friction factor and reynolds number . this thesis is emphasis on the new heat transfer enhancement structure , that is , disturb plates , with the comparison with the glossily channel and channel with pin fins , the heat transfer enhancement effect of the former is better , and the conclusion can be used in the design of aircraft blade 叶片内部通道冷却是一个复杂的对流?导热耦合传热问题，本文在分析叶片内部通道冷却的流动与传热情况的基础上，建立了三维、可压缩紊流的物理模型，得到了通用的求解办法；利用不带扰流片的矩形直通道、带顺排扰流片矩形直通道、带叉排扰流片、带倾斜扰流片的矩形直通道的几何模型，计算了冷却空气通过这几种通道时的流动与换热情况，得到了各种不同情况下计算区域的温度场、压力场、速度场；在此基础上分析了不同的通道高度、不同的叶片通道材质对叶片内部通道冷却的影响，并整理得到了各种通道形式下，努谢尔数和阻力因子与雷诺数的函数关系；本文重点研究了新型的叶片内部通道冷却强化传热措施?带扰流片的内部冷却通道的强化传热效果，通过与光滑矩形直通道、带针肋通道的冷却效果的比较，表明了这种新型鲒构的优势，对于叶片内部通道冷却结构的设计可以起到指导的作用。
Then the traditional pd controller and gain - scheduling fuzzy pd controller were designed to realize path following of parafoil system . simultaneously , several control strategies were brought forward in view of the basic flight properties of parafoil system . the important one was described as following : the 同时,基于翼伞系统基本运动特性,提出了一系列有针对性的控制策略,其中重要的一条是,将平均风的影响在轨迹归航中修正,而大气紊流的影响作为干扰由控制器来补偿。
This article ’ s purpose is to simulates the apron that adds the coarseness fluent speed of flow in to hang the upward distributed , through the comparison , absorbs other mathematical simulations in model and the method , established the surface two - dimensional current of water mathematical model of apron that adds the coarseness 本文以模拟海漫加糙后明渠紊流的流速在垂向上的分布规律为主要内容,通过比较、借鉴其它数学模拟的建模方法,建立了海漫加糙后水流垂向二维数学模型。
In this paper , hydromechanical theories , three - dimensional unsteady turbulent finite volume model and pheonics software are adopted to simulate the pressure field and the velocity field of the drainage pipe in allusion to the actuality of the necessary pressurization test before being used . then analyze the computational results and figure out the variational rules of pressure and velocity with different leakage location while close water test or close gas test is applied 本文针对无压管道交付使用前必须进行严密性试验的现状，运用流体力学基本理论和三维非稳态紊流的有限体积模型，采用pheonics计算软件，数值模拟不同管径下不同漏水点的渗漏情况，模拟闭水和闭气试验时管道内部的压强场和速度场的变化，并分析计算结果，从中找出其变化规律。
The nonlinear exponent is a function of the radial distance from the pumping well . the two - regime well flow problems being in the steady state . in the fourth chapter , the problems of two - regime well flow have been discussed concentrating on a kind of special seepage law 第四章对一种特殊的非线性渗流规律即充分紊流的情况，进行了全面、详细地讨论，推导出了该情况下井流问题的渗流速度、水头降深和井流函数的解析表达式，作出了些具有代表性的标准曲线。
Although the knowledge of wind effects on tall buildings has significantly improved over the last decades , an understanding of the mechanism that the atmospheric flow field to various wind include effects on structures has not been developed sufficiently for formulation of functional expressions . not only is the wind approaching a building complex , but the flow pattern generated around a building is complicated by the distortion of the mean flow field , the flow separation , the vortex formation , and the wake development 在过去的几十年里,虽然人们对高层建筑风效应的了解已有显著提高,但对大气流场与结构物各种风致响应的关系还不能用解析表达式加以描述。由于平均流场的奇变、流动分离、旋涡形成以及紊流的发展,不仅使得流向建筑物的风,而且使得绕建筑物的流谱变得十分复杂。
It begins by analyzing turbulent pipe flow to know about the structure of turbulence ; then it precedes to make a general impression of the velocity and concentration distribution in two - phase pipe flows based on complex findings of the predecessors , mainly digesting and retaining their essence . finally , it proposes the method and formulas of calculating the flow resistance of sewage in pipe viewing from the point of two - phase flows , which are associated with empirical equations used in practice at present 首先，对管道内的紊流进行分析，以了解紊流的结构；然后对前人大量纷繁复杂的液-固两相流动研究成果进行整理和取舍，以便对污水在管道内流动的流速分布和浓度分布状况有一个总体的把握；最后结合目前工程上采用的液-固、气-固两相流动阻力计算的经验公式，根据相似理论，提出了从两相流动的角度计算污水在管道内流动阻力的方法和公式。
