混合长度

在这些基础上叙述了动量、热量和质量传输的模型，证明Prandtl湍流混合长度理论是分子动量传输的模型。

It is proved that prandtl 's mixing length theory is based on the molecular momentum transport mechanism .

在许多工程问题中，利用Prandtl混合长度模型计算复杂类型的湍流射流问题已经不能满足要求。

In many engineering fields , it is not very well to solve the problems on the complex turbulent jet with Prandtl 's turbulent mixing length model .

我们首先评述了根据Reynolds的平均运动方程所建立的混合长度理论。

We begin with the review of the mixture length theories based upon Reynolds ' equations of mean motion .

本文从流体动力学原理出发，利用Prandtl混合长度和VonKarman自相似理论，建立河口海岸近底层潮流速分布的对数线性模式。

Based on fluid dynamic principle , the tidal velocity profile in the near-bottom layer in estuary and coast is established by introducing Prandtl mixing length theory and Von Karman self-similar theory .

本文以Prandtl混合长度理论为基础，结合实测资料提出了一个新的二维流速分布式。

Based on the Prandtl 's theory and the analysis of experiment data of velocity distribution in 2-D flow , new velocity distribution formula ( 12 ) is suggested .

本文参考Prandtl关于不可压自由湍流的混合长度理论，研究了轴流压气机叶片尾迹沿轴向的变化规律。

According to the Prandtl 's theory of Mixing-Length in reference to the incompressible free-turbulence , the law of axially attenuation of wake for axial compressor blade was studied in this paper .

为了工程应用上的简便，湍流模式采用零方程，即湍流剪应力的补充方程采用Prandtl的混合长度理论。

The zero-equation model of turbulence is used for the sake of simplicity for engineering application , i.e. the Reynolds shear-stress term may be eliminated by the concept of Prandtl 's mixing length theory .

本文在簿剪切层理论基础上，建立了平行射流组的理论模型，并依据Prandtl混合长度理论，求出了该模型的分析解。

In accordance with the theory of thin shear layer an analytical model is introduced for a parallel-multiple jets . Based on Prandtl 's mixing length hypothesis , the analytical solutions for the model are obtained .

改进了DENTON程序所使用的混合长度模型，使之能够适应壁面发展以及有适度分离流动的情况，并减少对经验的依赖。

The mixing length model of DENTON code was modified to make it fit the development of boundary layer and moderate scale separation , and also reduce the dependence on experience .

从这两种零方程模型的构造分析，Prandtl混合长度理论较为合理，但Chen的零方程模型更容易收敛。

The results show that Prandtl mixing length theory predicts airflows better than zero-equation model provided by Chen , and that Prandtl mixing length theory is more reasonable than zero-equation model provided by Chen but Chen 's model seems easier to converge from the analyses of their construction .

本文分别应用混合长度模型和两个方程的湍流模型（k-kl模型），对初始截而参数任意分布的不可压缩轴对称同轴射流初始段的湍流混合过程进行了数值分析。

By using a two-equation turbulence model ( k-kl model ), and the mixing-length model as well , a numerical analysis of turbulent mixing in the initial section of coaxial jets is presented .

管道气体置换混合长度变化规律研究

Study on length of mixed region during gas purging in pipeline

垂直涡动粘性系数采用混合长度理论。

The vertical eddy viscosity is derived based on the mixing-length theory .

混合长度理论应用于城市污水圆管湍流的研究

Study on pipe turbulent flow of urban sewage using mixed length theory

通过实验室模拟实验，确定了湍流情况下混合长度的经验公式；

By laboratory similarity simulation test , empirical formula . of mixing length is obtained .

滤罐溶气速率随时间延长而增长变缓。为了提高空气份额，可采取延长混合长度、增加湿润周界或提高摩擦系数。

Lengthening length of mixing tank , increasing wetted perimeter and improving frictional coefficient were efficient measures to enhance air dissolution .

建立了含有微气泡的平板边界层方程，并采用一种简单的混合长度模型和有限差分方法对该方程进行了数值计算。

The equations of the boundary layer containing microbubbles on the plate are established , then calculated employing a simple mixing length model and a finite difference method .

数值模拟的结果表明，用适当选取混合长度的单方程模型与双方程模型计算的结果基本一致；

The simulations based on single equation and two equations turbulent models were compared . The results of the both models at proper mixing length were consistent in general .

对卡门常数和普朗特混合长度进行了理论计算，并据此分析和论证了普朗特混合长度假说与动量传递理论和卡门关于紊流局部运动相似理论以及泰勒的涡旋传递理论的科学性和实用性。

Based on these calculations , the authors analyze the science-practical nature of the Prandtl Mixing Length hypothesis , the momentum-transport theory , the Karman Similarity theory and the Taylor Vorticity Transport theory .

实验观测了含植物河流中流速垂向分布，分析了剪切应力和紊动强度的垂向变化，并以经验和理论公式估计了涡动黏滞系数和普朗特混合长度的数值。

Vertical profiles of mean velocity were observed experimentally , vertical distributions of shear velocity and turbulence intensity were analyzed , and eddy viscosity and Prandtl mixing length were evaluated both theoretically and empirically .

计算中应用混合长度湍流模型和粒子示踪法，根据文献提供的基础数据，预测了非稳态氦气射流的贯穿度、浓度分布、速度分布及其随时间的变化等。

The mixing length turbulence model and particle track method are used in the calculations . Based on the experimental data taken from references , the penetration , distribution of the concentration and velocity of a helium jet and their variations with time were predicted .

出口角度、混合腔长度对分布指数K有一定的影响。

The length of mixer and the transition angle o also have influence on atomization level .

对实验结果进行分析，指出喷嘴轴向位置，混合管长度对引射器特性的影响。

From the experimental results the effects of nozzle axial position and mixer tube length upon ejector characteristic are revealed .

出口气流马赫数和总压沿径向差异较大，混合室长度存在一个最佳值。

Radial mach number and the total pressure of the outflow varies a lot , an optimized length of the mixer exists .

对比了射流孔间距、通道截面高度和混合段长度等参数对导流隔板防冰性能的影响。

The effects of channel height , mixing chamber length and space between the jet holes on the anti-icing system performance were studied .

多孔喷管引射器引射系数达到最大值时，混合室长度要比参考引射器对应该引射系数时的混合室长度小得多。

The mixing length ratio of the optimal multihole nozzle ejector is much shorter than that of the reference one if their entrainment coefficients are the same .

一种有效的TCP和UDP混合流队列长度控制方法

Efficient Method to Control Queue Length for Mixture Flows of TCP and UDP

热气导管内温度混合率随其长度的增加逐渐增大，热气导管长度2.5m以上时，温度混合率达到99%以上。

The temperature mixing rate in the hot gas duct increased with the increase of the hot gas duct , and when the length of the hot gas duct was more than 2.5 m , the temperature mixing rate was above 99 % .

液-液气引射器混合室最佳长度仿真研究

Simulation of the Optimum Length of Mixing Room in Liquid-Liquid Gas Ejector

请注意，这些混合信息的长度限制是512字节（参见AddSAMLToSecureContext.xsl）。

Please note that the miscellaneous information is limited to512 bytes long . [ see AddSAMLToSecureContext . xsl ]