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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The KSFM Journal of Fluid Machinery
Journal Basic Information
Journal DOI :
Korean Fluid Machinery Association
Editor in Chief :
Volume & Issues
Volume 15, Issue 6 - Dec 2012
Volume 15, Issue 5 - Oct 2012
Volume 15, Issue 4 - Aug 2012
Volume 15, Issue 3 - Jun 2012
Volume 15, Issue 2 - Apr 2012
Volume 15, Issue 1 - Feb 2012
Selecting the target year
Cross Flow Characteristics of the Core Simulator in SMART Reactor Flow Distribution Test Facility
Yoon, Jung ; Kim, Young-In ; Chung, Young-Jong ; Lee, Won-Jae ;
The KSFM Journal of Fluid Machinery, volume 15, issue 4, 2012, Pages 5~11
DOI : 10.5293/kfma.2012.15.4.005
To identify the flow characteristics of the SMART reactor, a flow distribution model test and a numerical simulation are performed in KAERI. Among several part of the SMART reactor, the fuel assemblies are simulated using simulators because of the complexity. The geometries of the core in the SMART reactor and simulator are different, but some similarities are maintained such as the ratio of pressure drop in the vertical and cross directions. There are cross flow holes in each core simulator to reproduce the cross flow of SMART fuel assemblies. To know the flow characteristics of the cross flow, numerical analysis is performed. As the cross flow area is decreased, the pressure drop between inlet and outlet is decreased. Also, when the flow imbalance between two core simulators is constant, the cross flow area does not significantly affect the cross flow.
Deviation Characteristics of Clamp-on Type Ultrasonic Flowmeter Installed in Downstream of Valves
Lee, Dong-Keun ; Cho, Yong ;
The KSFM Journal of Fluid Machinery, volume 15, issue 4, 2012, Pages 12~18
DOI : 10.5293/kfma.2012.15.4.012
This study was performed to found out the deviations for clamp-on type ultrasonic flowmeter installed in downstream of valves. It was selected three types of two-path flowmeter mainly used for K-water as test. Experiment carried out to confirmed characteristics of deviation depending on the sensor location, straight pipe length and maker for 1-path, 2-path and 4-path combined 2-path flowmeter. It was selected two kinds of valves with 100 % and 50 % opening, butterfly valves and gate valves, for flow disturbance factor. Finally, we suggested number of sensors by maker, straight pipe length and installed location of sensors satisfying the tolerance depending on the experiment results.
Numerical Study on Various Ribs in a Triangular Internal Cooling Channel
Park, Min-Jung ; Moon, Mi-Ae ; Kim, Kwang-Yong ;
The KSFM Journal of Fluid Machinery, volume 15, issue 4, 2012, Pages 19~26
DOI : 10.5293/kfma.2012.15.4.019
In this paper, a parametric study on ribs which are installed in an equilateral triangular internal cooling channel is presented. The numerical analysis of the flow structure and heat transfer characteristics is performed using three-dimensional Reynolds-averaged Navier-Stokes equations with the shear stress transport turbulence model. The numerical results are obtained at Reynolds number, 20,000. The parametric study is performed for the parameters, the angle of a rib, rib pitch-to-hydraulic diameter ratio, rib width-to-hydraulic diameter ratio, and rib height-to-hydraulic diameter ratio. The computational results are validated with the experimental data for area-averaged Nusselt number.
Experimental Research on the Performance of Air Turbine Starter for Gas Turbine Engines
Kim, Chun-Taek ; Yang, In-Young ; Cha, Bong-Jun ;
The KSFM Journal of Fluid Machinery, volume 15, issue 4, 2012, Pages 27~32
DOI : 10.5293/kfma.2012.15.4.027
Gas turbines for an aircraft have the start and restart capabilities within their flight envelop. It is an important item for engine qualification and substantiated with the test. Experimental investigations were carried out to find the relation between the corrected torque and the corrected rotating speed of an air turbine starter in this study. A dedicated air supply system for the air turbine starter and a special device to measure the torque and the rotating speed of the air turbine starter were developed and installed at the altitude engine test facility in Korea Aerospace Research Institute. Experimental results show that the relations between the corrected torque and the corrected rotating speed of the air turbine starter are linear and the inlet temperature and pressure conditions for the air turbine starter were found out to provide minimum required torque for the engine qualification test at various altitude. The start and restart tests for the currently developing engine were successfully performed using this experimental results.
Effects of the Lateral Ejection Angles and Distances of Double-Jet Holes on Flim Cooling Effectiveness
Choi, Dae-Woong ; Lee, Ki-Don ; Kim, Kwang-Yong ;
The KSFM Journal of Fluid Machinery, volume 15, issue 4, 2012, Pages 33~41
DOI : 10.5293/kfma.2012.15.4.033
In the present work, a parametric study on double-jet film-cooling has been carried out to enhance the film-cooling effectiveness using three-dimensional Reynolds-averaged Navier-Stokes analysis. The shear stress transport turbulence model is used as the turbulence closure. The lateral ejection angles and the lateral and streamwise distance between the centers of the cooling holes are chosen as the geometric parameters. The spatially averaged film-cooling effectiveness averaged over an area of 8 hole diameters in width and 30 hole diameters in streamwise length is used to evaluate the performance of film-cooling. The parameter of the lateral distance has the largest impact on the film cooling effectiveness compared to the others. On the other hand, the parameter of streamwise distance gives the least influence on the film cooling effectiveness.
Performance Study of Wind Augmentation Device for Building-integrated Wind Power
Shin, Jae-Ryul ; Park, Jae-Jeun ; Kim, Han-Young ; Kim, Dae-Young ;
The KSFM Journal of Fluid Machinery, volume 15, issue 4, 2012, Pages 42~49
DOI : 10.5293/kfma.2012.15.4.042
This study is performance estimation of wind augmentation device for BiWP(Building-integrated Wind Power) which recently attracts attention as a local power. various structures are installed on a rooftop of residential complex buildings. Changing a profile of these, we designed a configuration that is able to capture much air and increase exit velocity. To estimate wind augmented effect of this device, we compared numerical analysis results with wind tunnel test results. Results show that exit velocity is increased from 24% to 60% by wind augmented device on a rooftop of building.
A Study on Trends for Development of Wind Turbine Tower
Hong, Cheol-Hyun ; Jeong, Jae-Hun ; Kang, Byong-Yun ; Moon, Byung-Young ;
The KSFM Journal of Fluid Machinery, volume 15, issue 4, 2012, Pages 50~54
DOI : 10.5293/kfma.2012.15.4.050
Wind-power generation, which is recently drawing attention as one of renewable energies across the world, has been developed mainly by Europe. As the demand for the wind-power generation rose and the amount of wind-power generation increased, the studies on megawatt-class wind-power system have been active, and the use of composite with such properties as less weight, more strength, anti-corrosion and environment-friendliness has required gradually. In other word, wind turbine tower will be required to be lighter, more reliable and more consistent. Therefore it is necessary to lose weight of the wind turbine tower. This points squarely toward hybrid/composite tower production growing. It is important to note however that hybrid/composite tower production as it is today is flawed and that there are ways to improve greatly on the performance of these towers in manufacturing process and in their in-service performance. Through this, we have some detail on the current process and its advantage of cost and weight of towers.
Dynamic Characteristics Analysis of Filament-wound Composite Towers for Large Scale Offshore Wind-Turbine
Han, Jeong-Young ; Hong, Cheol-Hyun ; Jeong, Jae-Hun ; Moon, Byong-Young ;
The KSFM Journal of Fluid Machinery, volume 15, issue 4, 2012, Pages 55~60
DOI : 10.5293/kfma.2012.15.4.055
The purpose of this study is to investigate the buckling load of filament-wound composite towers for large scale wind-turbine using finite element method(FEM). To define material properties, we used both the effective property method and the stacking properties method. The effective properties method is to assume that composite consists of one ply. The stacking properties method is to assume that composite consists of some stacked plies. First, linear buckling analysis of the tower, filament-wounded with angles of [
] was carried out by two methods for composite material properties, the stacking method and the effective method. and FE analysis was performed for the composite towers according to filament winding angles of [
]. FE analysis results using the stacking properties of the composite were in good agreement with the results by the effective properties. The difference between FEM results by material properties methods was approximately 0~2.3% in buckling Analysis and approximately 0~0.6% in modal analysis. And above the angle of [
], there was a little change of buckling load.
Study on the Effect of the Impeller Diameter on the Performance of a Mixed-flow Pump
Lee, Heon-Deok ; Heo, Hyo-Weon ; Suh, Yong-Kweon ;
The KSFM Journal of Fluid Machinery, volume 15, issue 4, 2012, Pages 61~66
DOI : 10.5293/kfma.2012.15.4.061
Nowadays, precise prediction of the pump performance becomes more important than ever before in high-value industries such as power plants and large ships. The power consumed in such pumps of large head and capacity definitely affects the efficiency of the entire system. In this study, we report the theoretical and CFD results used in prediction of the performance change caused by the reduction of impeller diameter. We have found that the theoretical calculation is somehow useful at least in estimating the very beginning condition for the CFD main calculation.
Analysis of Performance Characteristics by Inner Flow Path of Side Channel Type Ring Blower
Lee, Kyoung-Yong ; Choi, Young-Seok ; Jeong, Kyung-Ho ; Park, Woon-Jean ;
The KSFM Journal of Fluid Machinery, volume 15, issue 4, 2012, Pages 67~71
DOI : 10.5293/kfma.2012.15.4.067
This study analyzed performance changes by an inner flow path of impeller groove for side channel type ring blower using CFD. Two models have the same side channel and clearance while one has an inner flow path and the other doesn't. To analyze the performance change of a ring blower, overall performance and local flow field were analyzed. For the overall performance, pressure increase and impeller torque were checked under the design flow condition. Under the design flow condition, pressure increase was greater for the model with the inner flow path. The model with the inner flow path showed improved efficiency because the area subject to torque decreased due to the creation of inner flow path. To analyze local flow field, a section was created from the representative location of each impeller groove toward the direction of radius. Inner channel pressure distribution depending on the rotation direction shows that the model with the inner flow path has pressure equilibrium of working fluid through the inner flow path. Velocity distribution of inside impeller groove shows that flow field was coupled and appeared to form an inner wall where the flow field was stabilized.