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RESREARCH ON FLUID CHARACTERISTIC WITHIN THE ROTATING-WING HEAT METER

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Journal of Hydrodynamics 2006年第4期18卷 458-463页

作者： LIU Zheng-gang du guang-sheng WANG Ning PAN Ji-hong School of Energy Source and Power Engineering Shandong University Jinan 250061 China

In order to improve the performance of rotating-wing heat meter and reduce the cost of development, the three dimensions numerical calculations of the intemal fluid characteristic within a heat meter are carried out based on the standard k-e turbulent mode, the finite volume method and SIMPLE algorithm. The speed field and pressure distribution within heat meter are analyzed according to the result of numerical calculation. The flux measurement accuracy and pressure loss of basal meter are forecasted according to the calculated results. The calculated results of the impeller＇s rotating speed are compared with experimental results and prove the validity of the calculated results. This researches shows the calculated results can forecast the performance parameters of basal meter and can provide great help for design of the heat meter.

关键词： heat meter numerical calculation rotating-wing

THE CALCULATION OF THE PROFILE-LINEAR AVERAGE VELOCITY IN THE TRANSITION REGION FOR ULTRASONIC HEAT METER BASED ON THE METHOD OF LES

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Journal of Hydrodynamics 2011年第1期23卷 89-94页

作者： LIU Yong-hui du guang-sheng TAO Li-li SHEN Fang School of Energy and Power Engineering Shandong University Jinan 250061 China

The measurement accuracy of an ultrasonic heat meter depends on the relationship of the profile-linear average *** are various methods for the calculation of the laminar and turbulence flow regions,but few methods for the transition *** present,the traditional method to deal with the transition region is to adopt the relationship for the turbulent flow *** this article,a simplified model of the pipe is used to study the characteristics of the transition flow with specific Reynolds *** k-εmodel and the Large Eddy Simulation（LES）model are,respectively,used to calculate the flow field of the transition region,and a comparison with the experiment results shows that the LES model is more effective than the k-εmodel,it is also shown that there will be a large error if the relationship based on the turbulence flow is used to calculate the profile-linear average velocity relationship of the transition *** profile-linear average velocity for the Reynolds number ranging from 5 300 to 10 000 are calculated,and the relationship curve is *** results of this article can be used to improve the measurement accuracy of ultrasonic heat meter and provide a theoretical basis for the research of the whole transition flow.

关键词： ultrasonic heat meter Large Eddy Simulation(LES) model profile average velocity linear average velocity pipe

THE TRANSIENT AERODYNAMIC CHARACTERISTICS AROUND VANS RUNNING INTO A ROAD TUNNEL

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Journal of Hydrodynamics 2010年第2期22卷 283-288页

作者： LI Li du guang-sheng LIU Zheng-gang LEI Li School of Energy and Power Engineering Shandong University Jinan 250061 China

In this article,the processes of vans running into a one-way two-lane road tunnel are simulated numerically using the dynamic mesh technique and RNG k ？ ε turbulence *** transient aerodynamic characteristics around vans are obtained in three cases：a single van,two vans side-by-side and two vans one after another running into the tunnel,*** a comparison with the results of the wind tunnel experiment,the transient simulation method is *** results show that,when a van runs into the tunnel,the aerodynamic drag coefficient increases near the tunnel entrance,and after entering the tunnel,the side force is generated,pointing to the tunnel wall nearer to the *** two vans run into the tunnel side-by-side,their drag coefficients increase by 50%,and the side force varies sharply with directions changing twice near the tunnel *** two vans run into tunnel one after another,the aerodynamic characteristics around the van in the front is similar to that of a single van,but the aerodynamic forces on the van behind do not have obvious *** the three cases,the aerodynamic forces have a sharp change when two vans run side-by-side,so driving side-by-side into a tunnel should be avoided for safety.

关键词： dynamic mesh technique transient aerodynamic characteristic road tunnel

THE INFLUENCE OF DIFFERENT DESIGN PARAMETERS AND WORKING CONDITIONS ON CHARACTERISTICS OF HEAT METERS

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Journal of Hydrodynamics 2009年第3期21卷 394-400页

作者： LIU Yong-hui du guang-sheng LIU Zheng-gang WANG You-yuan School of Energy and Power Engineering Shandong University Jinan 250061 China

In this article, the UDF technology in Fluent software is used to simulate three-dimensional flow fields and to obtain various flow parameters. The standard k -ε model and the RNG k -ε model are both used to calculate the inner flow field of the basal meter, and a comparison of the calculated results between two models shows that RNG k - ε model is more effective for calculations of the inner flow of rotary wing mechanism. The influence of tip clearance on the characteristics of the basal meter is studied. The influence of the bottom ribs on the heat meter is evaluated by the numerical simulation method. This article also simulates the flow of disturbance located at the inlet of the basal meter, and shows that a swirl located at the front of the basal meter can affect the stability of the heat meter.

关键词： two-channel heat meter numerical simulation tip clearance

EXPERIMENTAL AND NUMERICAL STUDIES OF AERODYNAMIC PERFORMANCE OF TRUCKS

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Journal of Hydrodynamics 2011年第6期23卷 752-758页

作者： QI Xiao-ni LIU Yong-qi du guang-sheng School of Transportation and Vehicle Engineering Shandong University of Technology Zibo 255049 China School of-Energy and Power Engineering Shandong University Jinan 255061 China

This article studies the truck-induced airflow. The results of numerical investigations are used to assess the effectiveness of the installed hash symbol （#） shaped fence on the truck. The Reynolds-averaged Navier-Stokes equations are solved using the finite volume method. The computed distributions of the pressure and the air velocity as well as the computed aerodynamic drag coefficients reveal the effects of a fence on the aerodynamic performance of the truck. It is shown that the hash symbol shaped fence plays its role due to its aerodynamic characteristics, better than those of the original model. For various gaps, the optimal position and height of fences are discussed in the *** experiments in a low speed wind tunnel provide the edidence for validation.

关键词： truck numerical simulation wind tunnel fence

Experimental study and finite element analysis of wind-induced vibration of modal car based on fluid-structure interaction

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Journal of Hydrodynamics 2013年第1期25卷 118-124页

作者： TAO Li-li du guang-sheng LIU Li-ping LIU Yong-hui SHAO Zhu-feng School of Energy and Power Engineering Shandong University School of Automotive Engineering Shandong Jiaotong University

The wind-induced vibration of the front windshield concerns the traffic safety and the aerodynamic characteristics of cars. In this paper, the numerical simulation and the experiment are combined to study the wind-induced vibrations of the front windshield at different speeds of a van-body model bus. The Fluid-Structure Interaction （FSI） model is used for the finite element analysis of the vibration characteristics of the front windshield glass in the travelling process, and the wind-induced vibration response characteristics of the glass is obtained. A wind-tunnel experiment with an eddy current displacement sensor is carried out to study the deformation of the windshield at different wind speeds, and to verify the numerical simulation results. It is shown that the windshield of the model bus windshield undergoes a noticeable deformation as the speed changes, and from the deformation curve obtained, it is seen that in the accelerating process, the deformation of the glass increases as the speed increases, and with the speed being stablized, it also tends to a certain value. The results of this study can provide a scientific basis for the safety design of the windshield and the body.

关键词： Fluid-Structure Interaction (FSI) wind-induced vibration numerical simulation

EXPERIMENTAL STUDY OF VELOCITY DISTRIBUTIONS IN THE TRANSITION REGION OF PIPES

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Journal of Hydrodynamics 2011年第5期23卷 643-648页

作者： LIU Yong-hui du guang-sheng LIU Li-ping SHAO Zhu-feng ZHAI Cheng-yuan School of Energy and Power Engineering -Shandong University Jinan 250061 China

The accuracy of an ultrasonic flowmeter meaurement depends on the profile-linear average velocity. But this velocity in the transition region is not available at the present. In this article, the velocity in the transition region in pipes is studied by experimental methods. The Particle Image Velocimetry （ PIV ） is used to measure the flow field in the transition region in pipes, and the measured results from PIV are in good agreement with the Westerwell＇s experimental data. Based on the experimental data of PIV, the curves of the profile-linear average velocity in the transition region against the Reynolds number in the range from 2 000 to 20 000 are obtained, and it is shown that the coefficient k is constant when the Reynolds number is in the range of 2 000-2 400 and 6 000-20 000, and the coefficient k is increasing when the Reynolds number is in the range of 2 400-6 000. The results of this article can be used to improve the measurement accuracy of the ultrasonic flowmeters and as a theoretical basis for the research on the transition flow.

关键词： ultrasonic flowmeter Particle Image Velocimetry (PIV) the profile-linear average velocity transition region pipe

FLUID CHARACTERISTICS OF ROTARY WING HEAT METER WITH SINGLE-CHANNEL

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Journal of Hydrodynamics 2008年第1期20卷 101-107页

作者： du guang-sheng Liu Zheng-gang LI Li LIU Yong-hui MA Yong-kun MENG Liang School of Energy and Power Engineering Shandong University Jinan 250061China

Fluid characteristics of a rotary wing heat meter with single-channel were studied through theretical analysis, numerical simulation and experiments. The obtained results show that the number of vanes can obviously influence the heat meter, but the water temperature seldom influence the meter , and the optimal number of vane is 6-8.

关键词： heat meter numerical simulation meter

SIMULATION OF 3-D FLOW AROUND A VAN-BODY TRUCK WITH RNG K-ε TURBULENCE MODEL

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Journal of Hydrodynamics 2001年第4期13卷 98-101页

作者： du, guang-sheng Wang, De-Chang Lei, Li Zhou, Lian-Di Coll. of Water Conservancy Wuhan Univ. Ji'nan 250061 China

It is proved that the calculation precision of the outside flow field of the van-body truck using PNG k-Ε turbulence model is higher than that using standard k-Ε turbulence model by means of experiments. The calculation results of the outside flow field of a certain domestic van-body truck are given. And by analyzing and comparing the different tail flow plots, the tail flow structural characteristics and the relationship between the position and the intensity of the tail vortex and the aerodynamic drag is obtained, which can direct the design of the outside aerodynamic shape of the van-body truck.

关键词： Computer simulation Drag Mathematical models Turbulent flow