Working out the qusi-difference equation of the air-water turbulent two fluid flow, and building the discrete equation series by current difference equation, which is adapted to one-phase flow, multi-phase flow and chemical reaction, etc.
建立了不可压缩等温条件下的，一般形式的水气两相湍流的数学模型，并采用通用微分方程形式，建立了适合单相流，多相流，带化学反应流动的通用离散化方程组，并建立了加快收敛速度的SIMPE—IEM方法。
In the high efficiency oil removal technology aspect, the theory study and application experiment of air sparged liquid-liquid hydrocyclone was carried out, enlightened by the air sparged solid-liquid hydrocyclone. Firstly, the strength and movement of dispersed phase was analyzed in theory, it was proved that the air bubble-oil drop polymer trend to move to the axes of hydrocyclone. Secondly, using CFD method, the characteristics of oil-air-water flow field were studied, including velocity distribution, pressure distribution, turbulent motion energy and its dissipation distribution. The characteristics and separation effect under different air injection methods were simulated. Thirdly, the separation ex-periment of air sparged liquid-liquid hydrocyclone was carried out at Lab. The major structure parameters of the hydrocyclone were optimized, the reasonable air injection method and performance parameters were determined through 4 groups of air injection experiments.
首先，对气携旋流场中分散相粒子的受力及运动进行了理论分析，证明了气泡与油滴形成的聚合体，更易于向轴心运动；其次，应用CFD方法，研究了油-气-水三相流场的速度分布、压力分布、湍动能及其耗散率分布特性，对不同注气方式的流场特性及分离效果进行了数值模拟；第三，开展了气携液-液旋流分离特性室内研究，优化了旋流器的主要结构参数，对四种注气方式的分离效率进行了对比，确定了合理的注气方式和操作参数；最后，在油田现场开展了处理聚驱采出污水工艺试验，确定了工艺运行参数，评价了处理效果。
Through building a mathematical model of gas water heater and using the non- structure grid and the K? εdouble equation model as a turbulence model, we can establish the closed equations composed with the continuity equation, the momentum equation component, K equation andεequation. Using eddy dissipation components combustion model, definition boundary conditions in turbulent flow of chemical composition mix and reaction, separation solver used for initialization and solve combustion model, we can obtain the temperature、pressure distribution of gas water heater, as well as CH4, O2, NO mass fraction of the concentration of distribution in combustion process. Through these distributions, the temperature field and each kind of combustion component characteristic were obtained, including some problems that in the design needs to be pay attention to. Through changing the air speed of flow in the software control panel, the difference of the combustion temperature and each kind of gas mass concentration distribution under the different excess air coefficient was obtained.
通过构建燃气快速热水器的数学模型，采用非结构化网格和K-ε双方程模型作为湍流模型，建立由连续方程、动量方程、K方程和ε方程组成的封闭微分方程组，使用涡耗散组分燃烧模型，定义带化学组分混合与反应的湍流流动边界条件，使用分离求解器初始化并求解燃烧模型，得出了新型燃气热水器内温度场、压力场的分布，以及燃烧过程CH_4、O_2、NO等气体质量分数浓度分布，通过这些分布，得出了温度场和各种燃烧组分的特点及设计中需要注意的一些问题；通过在软件控制面板改变空气流速，得出了不同过剩空气系数下燃烧温度及各种气体质量浓度分布的差异；另外，通过对热水器的引射器进行计算，发现其不能满足引射能力的要求，建议选用完全预混负压吸气引射器，并计算出了其尺寸。
The laminar plasma jet showed a length of about 7 times than that of a turbulent one, because of the reduced air entrainment.
与湍流等离子体射流相比，由于对周围冷气体卷吸减少，层流射流在喷射方向的长度可增长 6倍。
Simulations of thermal plasma flow and heat transferare conducted for various conditions and vast technical background, such as forplasma torch with pure argon or argon/hydrogen as the working gas, the plasma torchworking within the laminar or turbulent regime, the plasma torch with subsonic orsupsonic velocity at the exit, the laminar or turbulent plasma free jet or impinging jet, the argon plasma jet issuing into an air surroundings or the argon/hydrogen plasma jetissuing into an argon environment, the subsonic or supsonic plasma jet, the plasma jetat the LTE (Local Thermodynamic Equilibrium) or Non-LTE state, etc.
模拟中考虑了等离子体物性随温度的大幅度变化，考虑了不同的流动状态、不同的工质气体及环境气体，以及亚声速与超声速流动情形，模拟对象包括：以纯氩及氩一氢混合气体为工质的发生器，处于层流及湍流流动状况的发生器，亚声速及超声速电弧等离子体发生器，层流及湍流的等离子体自由射流及冲击射流，空气环境中的氩等离子体射流及氩气环境中的氩-氢混合气体为工质的等离子体射流，亚声速等离子体射流及超声速等离子体射流，LTE等离子体射流及化学非平衡等离子体射流，等等。
The result indicates that it is feasible to simulate the length of air cavity by the mathematic model of the turbulent flow. The length of air cavity is influenced not only by the size of lateral aerator but also by the size of base aerator.
结果表明，用紊流数学模型来模拟泄水道反弧末端侧墙掺气坎的空腔长度是可行的；侧墙掺气坎空腔长度不仅与侧墙掺气坎的体型尺寸有关，还与底部掺气坎的体型尺寸有很大关系。
The rapid formation and depletion of air bubbles that can damage the material at the solid/liquid interface under conditions of severe turbulent flow.
迅速形成及消散的气泡能够破坏在强烈湍流下的固态或液态的物体的接触面。
Topics include: molecular and turbulent diffusion, boundary layers, dissolution, phase partitioning, bed-water exchange, air-water exchange, settling and coagulation, buoyancy-driven flows, and stratification in lakes.
探讨课题计有：分子和紊流扩散、界分层、解、之间的分割、床与水间的交换作用、气与水间的交换作用、降和混凝、力流以及湖泊分层作用。
The system input in this case is turbulent air which produces random pitching motion of the vehicle.
在此情况下，系统的输入是紊流大气，它使飞行器产生随机俯仰运动。
The system in put in this case is turbulent air which produces random pitch in g motion of the vehicle.
在此情况下，系统的输入是紊流大气，它使飞行器产生随机俯仰运动。
It has a good handling and great stability making turns easy and being solid in turbulent air.
其良好的操作性和稳定性使其主动转弯既容易又能在乱流中保持稳定。
This paper is an application of Computational Fluid Dynamics in the turbulent flow of a three-dimensional air-conditioned room in which there are heat sources.
中文摘要：本文应用计算流体力学的理论和方法模拟了带内热源的三维空调房间室内气流的湍流流动。
Indoor air quality; turbulent measurement; dynamic characteristic; hot-wire
室内空气品质；湍流测量；动态特性；热线
The research results indicated the down flow vertically downward, no spit line created and no triangular area. Turbulent current turned from floor upward to downward, and operating space air flow is more stabilize.
研究结果表明：生物安全柜四面格栅出流更改为台面孔板出流，且高效过滤器占操作区横截面比例由一般80%达到94.2%后，相比较：操作区下降气流流线竖直向下，没有产生气流分割线，消除了三角形气流空白区域，台面下方产生的湍流由台面上方转到台面下方，操作区气流更加稳定。
In the mean time, applying k-ε double equations turbulent model, possibility density functioncombustion model, discrete ordinate radiation model and thermal 〓production model, the computer aided tests on HTAC were carried out bypreheating both the combustion air and low heat value gas fuel.
同时，采用k-ε双方程湍流模型、概率密度函数燃烧模型、离散坐标辐射模型以及温度型〓生成模型对助燃空气和低热值煤气双预热的高温空气燃烧过程进行了数值试验。
Calculated results showed that in simulated combustion conditions, turbulent intensity in the whole furnace was very high, and mixture of pulverized coal and gas flow were quite uniform, flame permeating degree in furnace were high, so it is advantageous to ignition, combustion and burn-off of pulverized coal. Flame formed high temperature area adjacent to burner at the center of furnace, and formation concentration of both fuel-NO_x and thermal-NO_x in that area were highest. With decreasing secondary air flow rate and increasing burn-off air flow rate, highest temperature in the area adjacent to burner in furnace decreased, and high temperature area would move towards upside of furnace, formation concentration of NOx decreased.
结果表明：在模拟的燃烧工况条件下，整个炉膛内部湍流强度都比较强烈，煤粉气流的混合非常好，火焰充满度高，有利于煤粉的着火燃烧与燃尽；火焰在燃烧器区域附近炉膛中心形成最高温度区域，在该区域内生成的燃料型NO_X和热力型NO_X浓度都最高；减少二次风量，提高燃尽风量可使炉膛内燃烧器区域的最高温度降低，使高温区域向炉膛上部移动，NO_X的生成浓度降低。
A large range of IRZ and intense fluctuating velocity area around the boundary of IRZ is measured and thought to be important to keep the excellent ignition and combustion characters of the new kind swirl burner. Together with temperature trace method, different structure and operation parameter of the burner are studied in this paper about their effects on turbulent and mixing characters of swirling jet. The structure variation includes different blade angle, use of central gear shape baffle, variable outer length and angle of lean primary air outlet, use of wedge outlet of lean primary air.
采用上述两种测量方法并结合热质比拟温度示踪的方法，本文对径向浓淡旋流煤粉燃烧器喷口结构和气流流动参数的变化对旋流流场的流动、混合、湍流脉动特性的影响进行了深入研究，研究了旋流叶片倾角大小、中心齿型扩锥、淡一次风扩口外伸长度和扩角的变化、淡一次风楔形扩口、直流二次风扩口角度的变化对出口旋转射流流动特性的影响，研究了一次风率和旋流二次风率运行参数变化的影响规律。
The thermal environment for train with cold air distrbution system was simulated numerically by K-ε turbulent model and CFD software.
针对25K硬座空调列车构建了物理模型，采用K-ε湍流模型，利用CFD软件，对列车采用低温送风技术时的车内热环境进行了数值模拟。
Cut into short lengths and cooled by turbulent air flow, these microfibers are then formed into a complex weblike structure on a moving conveyor screen.
它不同于纱线的形态，而是被切断的短纤维，通过气流冷却并铺散到一条传输带上，成为复杂的网络结构。
In this paper, the turbulent model and boundary conditions were chosen to simulate the clean operating room on the empty state condition based on CFD numerical methods. The impact on the different area of air inlet, the position and number of air outlet to the operating zone velocity were researched.
本文以千级洁净手术室作为研究对象，采用CFD数值模拟方法，选用合适的湍流模型和边界条件，模拟了手术室在空态下，送风口面积、回风口位置及数量对手术区速度场的影响。