流体力学

In this thesis, I summarize the theoretical calculation method, applied scope and notice of siphonic drainage system, and point out the advantage of siphonic drainage system compared with gravitation drainage system. In the archetype experiment study of siphonic drainage tube, I adopt different tube diameter and different structural height to survey the drainage volume and press in different place. I observe various kinds of flow state, and get chief factors which influence hydraulic peculiarity of system as the tube diameter or structural height, and find out the relevance of factor to flux. I apply CFD Fluent software and adopt standard k-ε model and RNG k-ε model, then use finite volume method and second-order upwind scheme to discrete numerical model, while coupling numeration of velocity field and press is based on SIMPLE. In the numerical simulation of curved part of tube, siphonic drainage tube experiment system and multi-outlet siphonic drainage system, I make research on internal velocity and press of system in different project condition by changing the tube diameter of curved part, negative press value in tube export and improving the quantity of water gutter. This thesis first adopts a method of combining archetype experiment and numerical simulation to study the siphonic drainage system, test and verify the validity of experiment and numerical simulation, and makefurther study on system, it solves the problems of limited testing conditions, and has a logical results, it can provide a valid method for optimizing and designing the drainage tube-net system. The conclusion have referring value for study and design of siphonic drainage system.

本文首先对虹吸式排水系统理论计算方法、适用范围以及注意事项做出总结，并分析了虹吸式排水系统的优势；再对虹吸式排水管道进行原型试验研究，采用不同管径不同立管高度，对系统流量、管道压强进行量测，观察了各种工况下的流态，对其水力特性进行研究分析，找出影响水力特性的落差、管径主要因素以及与排水量的关系；进一步应用计算流体力学Fluent软件，采用标准κ-ε模型与RNGκ-ε模型，计算过程应用有限体积法和二阶迎风格式对数值模型进行离散，速度和压力的耦合采用SIMPLE算法，分别对系统弯管段、虹吸排水管道试验系统、多斗虹吸式排水系统进行数值模拟分析，通过改变管段弯头处半径、管段出口负压值、增加雨水斗数对不同工况下系统内部的速度和压力进行研究；本文首次采用结合原型试验与数值模拟相结合的方法，对虹吸式屋面雨水排水系统进行研究，试验与模拟相互验证，并进行拓展，很好地解决了虹吸式屋面雨水排水系统由于试验条件限制问题，结果正确合理，为排水管网系统设计和优化研究提供了有效的方法，对工程设计有较好的参考价值。

The relationship between softwood longitudinal permeability and its structure was systematically studied based upon the principles of flow.

文首次提出搭接面及侧面胞壁上纹孔在流体纵向渗透时的不同作用，并运用流体力学的原理，对针叶树木材流体纵向渗透性与其构造的关系进行了系统分析。

Based on environmental science, combined with computational hydrodynamics and layer combustion theory, the soot produce mechanism in furnace for coal sootless combustion boiler is simulated in this paper.

以环境科学为基础，结合计算流体力学和燃烧学理论，对炉内碳黑生成进行了数值模拟。

For the research interest,the paper has studied the influence of such factors on the smoke movement ,as the height of spandrel,the width of horizontal projection,the width of heat passage,the breaking of external wall,as well as the wind speed,etc.

针对呼吸式幕墙存在的消防问题，利用计算流体力学方法对其火灾特性进行了数值模拟，研究了窗槛墙高度、防火挑檐宽度、热通道宽度、外幕墙破碎和室外风速等因素对幕墙通道内烟气流动特性的影响，得出了各因素对烟气蔓延速度、烟羽流温度、幕墙附近温度的影响规律。

Based on the conversation equations for hydrodynamics and chemical reaction dynamics, by adopting the k-e turbulent model and the EBU-Arrhenius combustion model, the SIMPLE algorithm was used to investigate numerically the methane-air premixed gas vented explosion process in the two-dimensional space of the spherical vessel with a conduit for explosion venting.

为了得到球形容器内可燃气体的泄爆强度产生机理以及燃烧火焰与压力传播的基本规律，从流体力学和化学反应动力学守恒出发，采用κ-ε湍流模型和EBU-Arrhenius燃烧模型，利用SIMPLE算法对带泄爆导管的球形容器二维空间内甲烷－空气预混气体的泄爆过程内外场进行了数值计算，获得了气体燃烧过程中火焰和压力传播特性以及气体流动特性，能够比较清晰地反映泄爆的整个过程。

Using two-dimensional numerical simulation of the full hydrodynamic equations, the dynamics of the counterpropagating wave, localized traveling wave and stationary overturning convection with the weakly Soret coefficient is studied.

本文通过二维流体力学基本方程的数值摸拟，讨论了具有较弱的Soret结合的中等长高比空腔中的Counterpropagatingwave，局部行进波及定常行进波的动力特性，探讨了局部行进波的Rayleigh数依赖性及稳定性。

The result shows that the reaction rate in loop reactor is better than in stirrer reactor.

在冷态模型装置上研究了环路反应器的流体力学特性和化学反应特性，建立了喷嘴喉部两相流的速度与喷嘴结构和操作压力的函数。

In CFD the stress tensor terms are often approximated by a turbulence model.

在计算流体力学中的应力计算，往往是近似由湍流模型。

In order to independence establish CFD software, this paper derives Navier-Stokes equations on non-inertial system and Favre-averaged equations, and Reynolds stress tensor on the basis of fluid mechanical fundamental.

为了独立编制CFD软件，本文从流体力学的基本原理出发，推导了非惯性系下Navier-Stokes方程组和Favre平均的方程组，同时对雷诺应力张量进行推导。

Om the subatom microcosmic particles to the integrated big universe, assimilating to the turbulence field sufficing Navier-Stoke Equations of hydrodynamics, this paper has put forward a series of fully different viewpoints with the modern physics, under the foundations, established the Astro-Unitive Field Equations.

对宇宙物质的认识，从微观亚原子粒子到整个宇宙，与流体力学的服从Navier-Stokes方程的湍流场比拟，本文提出了一系列与当今物理学绝然不同的观点，在此基础上，建立了宇宙统一场方程。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。