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Journal of University of Science and Technology Beijing 2006年第5期13卷 393-400页

作者： Bo Wang Jieyu Zhang Yin Zhang Youduo He Junfei Fan Yuan Fang Shengli An Material and Metallurgical School Inner Mongolia University of Science and Technology Baotou 014010 China Metallurgical and Ecological Engineering School University of Science and Technology Beijing Beijing 100083 China School of Materials Science and Engineering Shanghai University Shanghai 200072 China Research Institute Baosteel Shanghai 201900 China

The 1：1 water model of a twin-roll strip caster was set up based on the Froude number and the Reynolds number similarity criteria. A new type metal delivery system was designed for the twin-roll strip caster. The level fluctuation and the fluid flow in the pool of the water model were measured using the level detector and the 3D-LDV （laser doppler velocimetry） technology. It is shown that a wedged delivery system can produce the desirable level fluctuation and even fluid flow distribution in the pool Numerical simulations for the water model were performed. Comparisons between the numerical and physical simulation results show good agreement near the side dams.

关键词： twin-roll strip casting water modeling numerical simulation delivery system laser doppler velocimetry

Online measurement of solids motion in fluidized bed reactor with different distributor for Fischer–Tropsch synthesis

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Chinese Journal of Chemical Engineering 2018年第10期26卷 2003-2008页

作者： Xiaolai Zhang Weixin Qian Haitao Zhang Qiwen Sun Weiyong Ying Engineering Research Centre of Large Scale Reactor Engineering and Technology Ministry of Education State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China State Key Laboratory of Coal Liquefaction and Coal Chemical Technology Shanghai 201203 China

In this paper, the distributions of particle velocity in a gas–solid fluidized bed with branched pipe distributor or circle distributor were measured by using a laser doppler velocimetry. Our results show that, within a certain range of superficial gas velocity, when using circle distributor, the particle velocity is large and the distribution of the particle velocity is even more compared with the branched pipe distributor. On the basis of the amplitude of tangential movement statistics, the amplitude of tangential movement statistics(AVATMS) decreases with increasing the axial height under the appropriate superficial gas velocity.

关键词： Fischer–Tropsch synthesis laser doppler velocimetry Fluidized bed

A laser Imaging-LDV Coupling Measurement of Single Bubble Forming and Rising in Shear-thinning Fluid

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Journal of Thermal Science 2014年第3期23卷 233-238页

作者： FAN Wenyuan YIN XiaoHong School of Chemistry and Chemical Engineering Tianjin University of Technology

The shape evolution of bubble formed in carboxymethylcellulose(CMC) aqueous solution was real-time observed using laser image technique. The flow fields of liquid around growing and rising bubble were measured by laser doppler velocimetry(LDV), and the liquid mean velocity and its contour curves were obtained. The results show that bubble grows as spherical shape because of the dominant role of surface tension in the early period, and then is stretched gradually as a teardrop shape due to the common effect of buoyancy and shear-thinning of fluid. The axial mean velocity of liquid phase takes on Gaussian distribution with the symmetrical axis passing through orifice center. However, the radial mean velocity increases first and then decreases with the increase of the distance from measured point to the symmetrical axis above. Further, the axial component along symmetrical axis decreases initially and increases with the rise of height, as well as its corresponding contour map diverging gradually. The radial component, yet, decreases steadily with the rise of height, and the maximum value deviates towards the two sides until disappear, as it contour shape of butterfly's "front wing".

关键词： shear-thinning fluid bubble formation laser doppler velocimetry flow field

TWO COMPONENT LDV SYSTEM WITH DUAL-DIFFERENTIAL ACOUSTO-OPTICAL FREQUENCY SHIFT AND ITS APPLICATIONS

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Acta Mechanica Sinica 1986年第1期2卷 81-92页

作者： Shen Xiong Zhang Jingyi Wang Zongsen Yu Hesheng (Department of Engineering Mechanics,Tsinghua University) Department of Engineering Mechanics Tsinghua University Beijing China

This paper describes the main properties of the two component LDV systemdeveloped with the dual-differential frequency shift *** has the advantages ofmultiple functions,better *** high utilization of *** it offers as a completetechnique and method for measuring 2-D complex *** applying this system,2-D turbulentseparated flow measurements have been made in a duct with an asymmetrical suddenexpansion and in a wind tunnel flow over a 2-D *** Reynolds numbers were at 5900 and 4500respectively.

关键词： laser doppler velocimetry frequency shift two component

Experimental Investigation of Single-phase Flow in Structured Packing by LDV

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Chinese Journal of Chemical Engineering 2007年第6期15卷 821-827页

作者：陈江波刘春江李莹珂黄莹袁希钢余国琮 State Key Laboratory of Chemical Engineering Chemical Engineering Research CenterTianjin UniversityTianjin 300072China

To date, many models have been developed to calculate the flow field in the structured packing by the computational fluid dynamics （CFD） technique, but little experimental work has been carried out to serve the vali-dation of flow simulation. In this work, the velocity profiles of single-phase flow in structured packing are measured at the Reynolds numbers of 20.0, 55.7 and 520.1, using the laser doppler velocimetry （LDV）. The time-averaged and instantaneous velocities of three components are obtained simultaneously. The CFD simulation is also carried out to numerically predict the velocity distribution within the structured packing. Comparison shows that the flow pattern, velocity distribution and turbulent kinetic energy （for turbulent flow） on the horizontal plane predicted by CFD simulation are in good agreement with the LDV measured data. The values of the x-and z-velocity components are quantitatively well predicted over the plane in the center of the packing, but the predicted y-component is sig-nificantly smaller than the experimental data. It can be concluded that experimental measurement is important for further improvement of CFD model.

关键词： velocity profile structured packing laser doppler velocimetry computational fluid dynamics

Effect of laser pulse shape and duration on spectrum width of coherent LIDAR

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Chinese Optics Letters 2014年第A01期12卷 165-168页

作者：步志超陈思颖张寅超陈和葛宪莹郭磐 Beijing Institute of Technology Beijing 100081 China

doppler spectrum width, which relates to wind turbulence, is one of the essential parameters of coherent LIDAR. Using the Fourier transform theorem and the definition of correlation function, the power spectrum function in the stationary condition is deduced. The effects of pulse shape, pulse duration and the windowing are included. The spectrum width resulted from the turbulence is given under Kolmogorov turbulence model. Based on the power spectrum theory, the spectrum broadening by different pulse shapes and pulse durations are calculated. To validate the accuracy of the theory and usage in the retrieval of turbulence parameters, the numerical simulations of the echo signal are carried out in turbulence conditions. The statistics characteristics of the spectrum broadening from laser pulse shapes and durations are inverted aud compared. The results show that the spectrum broadening varies greatly due to the selection of pulse shapes and pulse durations, and the numerical simulation is in accordance with the theory results.

关键词： 280.3640 Lidar 070.4790 Spectrum analysis 010.1330 Atmospheric turbulence 170.3340 laser doppler velocimetry