层流

The characteristic and difference of flow in porous media between the pseudo-plastic fluids and the expansile fluids was described in detail. The experimental pressure drop measurements were made in a packed bed under a variety of conditions, and the variation of the friction factor with the Reynolds number was obtained. Corresponding to the flow resistance in a nonporous channel, the flow resistance in porous media can be divided into Darcy resistance and Forchheimer resistance as well. The experiment data was divided into Darcy regime, transitional regime and Forchheimer regime in accordance with the Reynolds number.

实验测定了不同浓度聚丙烯酰胺溶液在五组填充多孔介质中流动的压降-流量关系，绘出了阻力因子随Reynolds数变化的关系曲线；按照将流动阻力分为层流粘性阻力和惯性阻力的观点，将多孔介质流动阻力分为Darcy阻力和Forchheimer流动阻力；参考有关文献，将实验区域按Reynolds数范围分为Darcy流动、过渡流动和Forchheimer流动。

Then the coefficients of entrance region effect and the relations between them, and the flowbehaviour index n can be obtained by solving the energy integral equation. Under the assumption of the velocity distribution within boundary layer: f = 1-(1-η)n+1/n for example, co...

以边界层内幂律流体层流速度分布假设f=(1一η)~(n+1/n为特例，所求出的结果与文献[4]中的理论值和实验值比较表明，本文的计算是既简便又可靠的。

Applications of the Laminar Flamelet Model to Turbulent Combustion in Diesel Engines

将湍流燃烧的层流小火焰模型应用于典型的柴油机扩散燃烧过程。

This builds up the fundamental of the flamelet model, and makes it possible to use the laminar flamelet model to simulate the complicated turbulent combustion process in diesel engines.

层流小火焰模型在近年来得到了广泛的应用，但是，在内燃机上的应用却不多，国内关于此方面的研究基本上仍是空白。

The assumption of unity Lewis number in the flamelet model of turbulent combustion is examined and the influence of differential diffusion and radiation on the flamelet structure, nitric oxide emission and extinction limit is investigated.

对拉伸层流扩散火焰面进行了数值模拟，考察了在以往湍流燃烧的火焰面模型中，假定Lewis数等于1的可靠性，研究了不同分子扩散和火焰辐射对火焰面结构、氮氧化物排放和熄火临界的影响。

A combustion simulation adopting the Reynolds stress model and the Laminar Flamelet model was performed to determine the effect of humidity in the combustion air on temperature, velocity and NO distributions of methane/air diffusion combustion in a swirl combustor.

采用湍流雷诺应力微分模型和层流小火焰模型，对湿空气透平带旋流器的燃烧室内甲烷扩散燃烧过进行了数值模拟。

The laminar flamelet model in combination with joint probability density function transport equation of mixture fraction and turbulence frequency is used to simulate fluctuating behavior of radiative source term in turbulent jet diffusion flames of hydrogen.

采用κ-ε湍流模型、标量联合的概率密度函数输运方程和层流火焰面模型相结合，模拟氢气自由扩散火焰中辐射源项湍流脉动特征。给出了主燃区内辐射源项湍流脉动的频率图。辐射源项的样本点分布集中，大约95%以上的样本落在其系综的±3倍方差以内，频谱图为单峰

The application of flamelet model based on level set in premixed turbulence combustion;2. A methane turbulent non-premixed flame has been simulated numerically by the combination of laminar flamelet model and presumed probability density function.

将小火焰模型和假定的PDF方法相结合，模拟甲烷湍流射流扩散火焰，稳态火焰面结构由层流小火焰数据库得到，采用详细化学反应机理描述甲烷的氧化和NO以及碳烟的生成，数值模拟结果和实验数据吻合较好，说明小火焰模型可以较准确地计算出扩散湍流火焰中的燃烧过程。

Based on the research, the effect of rock mechanics parameters on casing load in flowage formation is analyzed.

针对由于地层具有流变特性对套管载荷的影响以及由于泥岩浸水等因素造成的地层流变特性改变而对套损产生影响等问题，根据开尔文模型推导了流变地层中套管载荷和地层粘度的关系，从而反映了套管载荷随时间的变化，在此基础上分析了流变地层岩石力学参数对套管载荷的影响。

During backwashing, the control of the fluidization is an important approach to control the biofilm.

在反冲洗过程中，控制好滤层流态是一条控制微生物量的重要途径。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。