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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 14, Issue 6 - Dec 2011
Volume 14, Issue 5 - Oct 2011
Volume 14, Issue 4 - Aug 2011
Volume 14, Issue 3 - Jun 2011
Volume 14, Issue 2 - Apr 2011
Volume 14, Issue 1 - Feb 2011
Selecting the target year
A Study on Structural Analysis of Butterfly Valve Components by Pressure Testing of the Industrial Standard
Shin, Myung-Seob ; Yoon, Joon-Yong ; Park, In-Won ; Lee, Seoung-Hwan ; Park, Han-Yung ; Jung, Seung-Hwa ;
The KSFM Journal of Fluid Machinery, volume 14, issue 3, 2011, Pages 5~9
DOI : 10.5293/KFMA.2011.14.3.005
Butterfly valves are widely used in current industry to control the fluid flow. They are used for both on-off and throttling applications involving large flows at relatively low pressure-drop especially in large size pipelines. In this study, we carried out the structure analysis of the butterfly valve components according to pressure testing of the industrial standard. the numerical simulation was performed by using ANSYS Workbench. The reliability of valve is evaluated under the investigation of the strain rate, the leak test and the durability of the valve.
Two-dimensional Numerical Simulation of the Contact Angle and the Bubble Necking Using the Two Phase Lattice Boltzmann Method
Ryu, Seung-Yeob ; Kim, Jae-Yong ; Ko, Sung-Ho ;
The KSFM Journal of Fluid Machinery, volume 14, issue 3, 2011, Pages 10~17
DOI : 10.5293/KFMA.2011.14.3.010
Free energy based lattice Boltzmann method (LBM) has been used to simulate the contact angle and the bubble necking with large density ratio. LBM with the proper contact angle model is able to reduce the spurious currents and eliminate the singularity in the contact lines. The numerical results of the contact angles are satisfied with the Youngs law. For bubble necking flows, simulations are executed for various viscosities and contact angles. The phenomena of the bubble necking are simulated successfully and the subsequent results are presented. The present method is also applicable to the nucleate boiling flows.
Performance Analysis of a Micro-Hydro Pelton Turbine for the Osmotic Power Generation
Oh, Hyoung-Woo ;
The KSFM Journal of Fluid Machinery, volume 14, issue 3, 2011, Pages 18~22
DOI : 10.5293/KFMA.2011.14.3.018
This paper presents the transient performance analysis of a micro-hydro Pelton turbine for the osmotic power generation using the commercially available computational fluid dynamics (CFD) code, ANSYS CFX. The detailed flow field in the micro Pelton turbine with a single-jet is investigated by the CFD code adopted in the present study. Predicted characteristic curves agree fairly well with measured data for a prototype Pelton turbine over the normal operating conditions. The computational analysis method presented herein can be effectively applied to the hydraulic design optimization process of general purpose Pelton turbine runners.
Development of Localized Roots Type Medium-Vacuum Pump
Tak, Bong-Yeol ; Kim, Byung-Duk ; Yang, Hea-Gyeong ; Han, Gi-Young ; Lee, So-A ;
The KSFM Journal of Fluid Machinery, volume 14, issue 3, 2011, Pages 23~27
DOI : 10.5293/KFMA.2011.14.3.023
Due to a roots type medium vacuum pump is operated in condition of
torr vacuum, it could be applied for production and process of industrial parts, such as precise processing, vaporization, enrichment, separation, casting, metaling, welding, transportation. Therefore, the demand of this pump is increasing nowadays in our industrial markets of semiconductor, electric, electronic, automobile, material, environmental and transporting industries. However, the pumps are almost imported, because the domestic pumps are inferior in fields of vacuum range as under
torr, relevant techniques(design, fabrication, casting, test, etc.) to the imported ones. In this study, essential parts of the development pump are designed with using of CFD and 3D decodes, FEM for analysing strength and deformation, generated heat, vibration and noise control, and are casted with using of mechanochemistry techniques for decreasing of weights, increasing of heat resistances and abrasion durability of materials for pump caing and impellers especially. Besides, in order to achieve ultimate vacuum around
torr, this pump is composed of 6 stages, among which 1st stage is operated separately from remained stages. Additionally, a test rig for prototype pumps(300
) is designed and procured as to apply for multi-staged rootz type vacuum pump, with modification of the test method recommended by KS B 6314 "Positive-displacement oil-sealed rotary vacuum pumps".
An Experimental Study on the Estimation of Oil Discharge Rate from Inverter Rotary Compressor
Sin, Hyun-Seok ; Byun, Soon-Seok ; Tae, Sang-Jin ; Moon, Je-Myung ; Kim, Youn-Jea ;
The KSFM Journal of Fluid Machinery, volume 14, issue 3, 2011, Pages 28~32
DOI : 10.5293/KFMA.2011.14.3.028
The inverter rotary compressor discharges refrigerant and compressor oil in air-conditioning systems. The compressor oil which discharged form compressor decreases the efficiency of heat exchanger and affects the compressor operation. Recently, several studies are in progress for reducing the compressor oil. Before the reduction of compressor oil discharge rate, the quantitative measurement and evaluation method are required. In order to cope with this requirement we have developed the measurement technic of oil discharge rate. The reliability assessment was carried out approximately 0.1% of the errors with compressor performance indicators. The acceptable errors were to ensure the reliability of measurement technic. In the experiment results at several conditions, The oil discharge rate of heating operation has been confirmed average 3.7 times more than cooling operation. In this study the evaluation method and the experimental results of oil discharge rate in air-conditioning systems are presented with various operating conditions.
Thermal-flow Analysis of the Cooling System in the Medicated Water Electrolysis Apparatus
Jeon, Seong-Oh ; Lee, Sang-Jun ; Lee, Jong-Chul ; Kim, Youn-Jea ;
The KSFM Journal of Fluid Machinery, volume 14, issue 3, 2011, Pages 33~38
DOI : 10.5293/KFMA.2011.14.3.033
Medicated water electrolysis apparatus, which electrolyzes water into acidic water and alkaline water, was in the spotlight as becoming known the effect of alkaline water. It is known as good for health as removing active oxygen in the human`s body and promoting digestion. But, the customers could not get that desired water temperature because these apparatuses are directly connected with a water pipe. So, the cooling system was developed for controlling the temperature of the alkaline water. One of the typical way is to store water in water tank and control the temperature. But, in this way, storing water can be polluted impurities coming from outside. For protecting this pollution, the cooling system based on indirect heat exchange method through phase change between water and ice was developed. In this study, we have calculated efficiency of the cooling system with phase change by experiment and commercial CFD(Computational Fluid Dynamics) code, ANSYS CFX. To consider the effect of latent heat that is generated by melting ice, we have simulated two phase numerical analyses used enthalpy method and found the temperature, velocity, and ice mass distribution for calculating the efficiency of cooling. From the results of numerical analysis, we have obtained the relationship between the cooling efficiency and each design factor.
Aerodynamic and Structural Design of 6kW Class Vertical-Axis Wind Turbine
Kim, Yo-Han ; Kim, Dong-Hyun ; Hwang, Mi-Hyun ; Kim, Kyung-Hee ; Hwang, Byung-Sun ; Hong, Un-Sung ;
The KSFM Journal of Fluid Machinery, volume 14, issue 3, 2011, Pages 39~44
DOI : 10.5293/KFMA.2011.14.3.039
In this study, performance analyses have been conducted for a 5MW class wind turbine blade model. Advanced computational analysis system based on computational fluid dynamics(CFD) and computational structural dynamics(CSD) has been developed in order to investigate detailed dynamic responsed of wind turbine blade. Reynolds-averaged Navier-Stokes (RANS) equations with K-
turbulence model are solved for unsteady flow problems of the rotating turbine blade model. A fully implicit time marching scheme based on the Newmark direct integration method is used for computing the coupled aeroelastic governing equations of the 3D turbine blade for fluid-structure interaction (FSI) problems. Predicted aerodynamic performance considering structural deformation effect of the blade show different results compared to the case of rigid blade model.
Effect of Geometric Variation on Starting Characteristic Analysis of H-Darrieus Blades
Jeong, Jin-Hwan ; Kang, Ki-Won ; Kim, Berm-Soo ; Lee, Jang-Ho ;
The KSFM Journal of Fluid Machinery, volume 14, issue 3, 2011, Pages 45~49
DOI : 10.5293/KFMA.2011.14.3.045
This paper describes the numerical analysis of effect of geometric variation on the straight-bladed vertical axis wind turbine. Geometry variation is performed with pockets on the blades. The results presented in this numerical analysis show the general flow pattern of near the bladed, and azimuth angle variation on stating torque value. It is shown that the pockets makes torque higher about 80%.
Characteristic of Wind Flow around Building Structures for Wind Resource Assessment
Cho, Kang-Pyo ; Jeong, Seung-Hwan ; Shin, Seung-Hwa ;
The KSFM Journal of Fluid Machinery, volume 14, issue 3, 2011, Pages 50~58
DOI : 10.5293/KFMA.2011.14.3.050
To utilize wind resources effectively around buildings in urban area, the magnitudes of wind velocity and turbulence intensity are important, which means the need of the information about the relationship between the magnitude of wind velocity and that of fluctuating wind velocity. In the paper, wind-tunnel experiments were performed to provide the information about Characteristic of Wind flow around buildings with the spanwise distance and the side ratio of buildings as variables. For a single building with the side ratios of one and two, the average velocity ratio was 1.4 and the velocity standard deviation ratio ranged from 1.4 to 2.6 at the height of 0.02m at the corner of the windward side, in which flow separation occurred. For twin buildings with the side ratios of one and two, the velocity ratio ranged from 2 to 2.5 as the spanwise distance varied at the height of 0.02m, and the velocity standard deviation ratio varied near 1.25. For twin buildings with the side ratios of one and two, the maximum velocity ratio was 1.75 at the height of 0.6m, and the maximum velocity standard deviation ratio was 2.1. It was also found from the results of CFD analysis and wind-tunnel experiments that for twin buildings with the side ratios of one and two, the difference between the velocity ratio of CFD analysis and that of wind-tunnel experiments at streamwise distances was near 0.75.
A Study on Development for Wind Turbine Rotor Hub using Design of Shape Optimization
Kim, Young-Il ; Moon, Sung-Young ; Lee, Ji-Hyun ; Lee, Yun-Sung ; Moon, Byung-Young ;
The KSFM Journal of Fluid Machinery, volume 14, issue 3, 2011, Pages 59~64
DOI : 10.5293/KFMA.2011.14.3.059
Wind turbine frame will be required to be longer, lighter, more reliable and more consistent. Therefore it is necessary to lose weight of the wind turbine hub. Light-weight Design of a wind turbine is required to be at least 20 years. Therefore, this paper investigates the development for wind turbine rotor hub using design of topology optimization. The model is a pitch regulated wind turbine with three rotor blades where the main frame is made of nodular iron. For optimization, calculating stresses based on displacements and based on these data to carry out a verification of static and fatigue strength carried out. For this verification, two kind of analysis is used. One is static analysis and the other is fatigue analysis. Then the rotor hub of wind turbine frame is optimized using topology method.