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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Korean Society of Mechanical Engineers B
Journal Basic Information
Journal DOI :
The Korean Society of Mechanical Engineers
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Volume & Issues
Volume 32, Issue 12 - Dec 2008
Volume 32, Issue 11 - Nov 2008
Volume 32, Issue 10 - Oct 2008
Volume 32, Issue 9 - Sep 2008
Volume 32, Issue 8 - Aug 2008
Volume 32, Issue 7 - Jul 2008
Volume 32, Issue 6 - Jun 2008
Volume 32, Issue 5 - May 2008
Volume 32, Issue 4 - Apr 2008
Volume 32, Issue 3 - Mar 2008
Volume 32, Issue 2 - Feb 2008
Volume 32, Issue 1 - Jan 2008
Selecting the target year
A Study on the Shock Wave Caused by VCE in Enclosure
Leem, Sa-Hwan ; Lee, Jong-Rark ; Huh, Yong-Jeong ;
Transactions of the Korean Society of Mechanical Engineers B, volume 32, issue 1, 2008, Pages 1~6
DOI : 10.3795/KSME-B.2008.32.1.001
In order to establish detailed plans for fire protection and reduce the possible fire accidents in the future, a study on the shock wave caused by VCE(Vapor Cloud Explosion) is very important. Destruction phenomena of structure by gas explosion is due to the explosion pressure and heat. Explosion pressure is a kind of energy converted from the gas mixture explosion. Therefore, the propagation progress of shock wave and flame is very important. This study investigated the shock wave caused by VCE in enclosure with opened vent port. From a result, the vent port of top at the straight line of ignition and leak location was opened most rapidly, and the vertical vent port not opened.
Effect of Lean-rich Fuel Staging to the Multiple Jet Flames on the Blowout Velocity
Lee, Byeong-Jun ; Park, Kyung-Wook ;
Transactions of the Korean Society of Mechanical Engineers B, volume 32, issue 1, 2008, Pages 7~14
DOI : 10.3795/KSME-B.2008.32.1.007
It has been reported that partially premixed interacting flame could be sustained till sonic exit velocities if eight small nozzles are arranged optimally and one nozzle on the center is fed small amount of fuel. But the equivalence ratios in this experiments were 20-60. In this research, experiments were conducted to know the effects of lean-rich staging in multiple jet flames on the blowout velocity. The fuel mole tractions in the fuel-air mixture, the nozzle exit velocity and the diameter between adjacent nozzles were alternatively changed. When the lower mole fraction fuel was fed to the nozzles located near the center and small amount of fuel to the center nozzle, flame was not extinguished even at the nozzle exit velocity of 200m/s. Also the interacting flame could be sustained till that velocity when four small size nozzles for lean mixture were located within the arrangement of four nozzles for rich mixture and configured optimally.
A Study on the Fluid Flow and Heat Transfer Characteristics for the Wire-woven Bulk Kagome(WBK) Composed of Aluminum Helix Wires
Joo, Jai-Hwang ; Kang, Bo-Seon ; Kang, Ki-Ju ;
Transactions of the Korean Society of Mechanical Engineers B, volume 32, issue 1, 2008, Pages 15~22
DOI : 10.3795/KSME-B.2008.32.1.015
Recently, ultra-lightweight materials with open, periodic cell structures take much attention owing to its potential for multi-functionality such as load bearing, thermal dissipation, and actuation. This paper presents experimental results on the fluid flow and heat transfer characteristics for the Wire-woven Bulk Kagome (WBK) composed of aluminum 1100 wires. The overall pressure drop and heat transfer of the WBK specimen was experimentally investigated under forced air convection condition. The pressure loss and heat transfer performance of the aluminum WBK were compared with other heat dissipation media. It was shown that heat transfer characteristics depended on relative density and surface area density. Comparison with metal foams and other heat dissipation media such as packed beds, lattice frame materials, louvered fins, and others suggests that the aluminum WBK competes favorably with the best available heat dissipation media in heat transfer performance.
Comparative Study on High Resolution Schemes in Interface Capturing Method Suitable for Unstructured Meshes
Myong, Hyon-Kook ;
Transactions of the Korean Society of Mechanical Engineers B, volume 32, issue 1, 2008, Pages 23~29
DOI : 10.3795/KSME-B.2008.32.1.023
Two high resolution compressive schemes, CICSAM(Ubbink, 1997) and HRIC(Muzaferija & Peric, 1999), in interface capturing method are reviewed briefly with respect to the extended forms suitable for unstructured meshes. And then those are applied to three typical test cases of translation test, shearing flow test and collapsing water problem with an obstacle. It is accomplished by implementing the high resolution schemes in the in-house CFD code(PowerCFD) for computing 3-D flow with an unstructured cell-centered method, which is based on the finite-volume technique and fully conservative. The calculated results show that CICSAM is better than HRIC with respect to accuracy and robustness, although either scheme can be used as a good choice for free surface or two-phase flow simulation.
Reynolds-number Effect on the Flow Past Two Nearby Circular Cylinders
Lee, Kyong-Jun ; Choi, Choon-Bum ; Yang, Kyung-Soo ;
Transactions of the Korean Society of Mechanical Engineers B, volume 32, issue 1, 2008, Pages 30~38
DOI : 10.3795/KSME-B.2008.32.1.030
As a follow-up of our previous studies on flow-induced forces on two identical nearby circular cylinders immersed in the cross flow at Re=100 and flow patterns past them,
we present Reynolds-number effects on the forces and patterns by further computing flows with Re=40, 50, 160. We consider all possible arrangements of the two circular cylinders in terms of the distance between the two cylinders and the angle inclined with respect to the main flow direction. Collecting all the numerical results obtained, we propose contour diagrams for mean force coefficients and their rms of fluctuation as well as for flow patterns and Strouhal number for each Re. These diagrams shed light on a comprehensive picture on how the wake interaction between the two cylinders alters depending on Re.
Effects of the Blockage Ratio of a Valve Disk on Loss Coefficient in a Butterfly Valve
Rho, Byung-Joon ; Choi, Hee-Joo ; Lee, Jee-Keun ;
Transactions of the Korean Society of Mechanical Engineers B, volume 32, issue 1, 2008, Pages 39~46
DOI : 10.3795/KSME-B.2008.32.1.039
The loss coefficient of the butterfly valve which allows partial opening of the valve at closed position and is applicable to the small-sized pipe system with the diameter of 1 inch was measured for the variation of the valve disk blockage ratio. Two different types of the valve disk configuration to adjust the blockage ratio were considered. One was the solid type valve disk of which the diameter was changed into the smaller size rather than the pipe diameter, and the other was the perforate type valve disk on which some holes were perforated. The results from two types of valve disk were compared to identify their characteristics in the loss coefficient distributions. The loss coefficient and the controllable angle of the valve disk were decreased exponentially with the decrease of the blockage ratio. In addition, the perforate valve disk had the effect on the higher loss coefficient rather than the solid type valve disk.
Study of Wake Control by Blowing and Suction in Front of the Vertical Fence
Choi, Young-Ho ; Kim, Hyoung-Bum ;
Transactions of the Korean Society of Mechanical Engineers B, volume 32, issue 1, 2008, Pages 47~53
DOI : 10.3795/KSME-B.2008.32.1.047
The effect of periodic blowing and suction of upstream flow on the separated shear flow behind the vertical fence was experimentally investigated. The fence was submerged in the turbulent shear flow and DPIV method was used to measure the instantaneous velocity fields around the fence. Periodic blowing and suction flow was precisely generated by the syringe pump. Spanwise nozzle made 2D planar periodic jet flow in front of the fence and the effect of frequency and maximum jet velocity was studied. From the results, the reattachment length can be reduced by 60% of uncontrolled fence case under the control.
Performance Analysis of a Gas Turbine for Power Generation Using Syngas as a Fuel
Lee, Jong-Jun ; Cha, Kyu-Sang ; Sohn, Jeong-Lak ; Joo, Yong-Jin ; Kim, Tong-Seop ;
Transactions of the Korean Society of Mechanical Engineers B, volume 32, issue 1, 2008, Pages 54~61
DOI : 10.3795/KSME-B.2008.32.1.054
Integrated Gasification Combined Cycle (IGCC) power plant converts coal to syngas, which is mainly composed of hydrogen and carbon monoxide, by the gasification process and produces electric power by the gas and steam turbine combined cycle power plant. The purpose of this study is to investigate the influence of using syngas in a gas turbine, originally designed for natural gas fuel, on its performance. A commercial gas turbine is selected and variations of its performance characteristics due to adopting syngas is analyzed by simulating off-design gas turbine operation. Since the heating value of the syngas is lower, compared to natural gas, IGCC plants require much larger fuel flow rate. This increases the gas flow rate to the turbine and the pressure ratio, leading to far larger power output and higher thermal efficiency. Examination of using two different syngases reveals that the gas turbine performance varies much with the fuel composition.
Development of a Post-Processing Program for Flow Analysis Based on the Object-Oriented Programming Concept
Myong, Hyon-Kook ; Ahn, Jong-Ki ;
Transactions of the Korean Society of Mechanical Engineers B, volume 32, issue 1, 2008, Pages 62~69
DOI : 10.3795/KSME-B.2008.32.1.062
A post-processing program based on the OOP(Object-Oriented Programming) concept has been developed for flow visualization of the flow analysis code(PowerCFD) using unstructured cell-centered method. User-friendly GUI(GTaphic User Interface) has been built on the base of MFC(Microsoft Foundation Class). The program is organized as modules by classes including those based on VTK(Visualization ToolKit)-library, and these classes are made to function through inheritance and cooperation which is an important and valuable OOP concept. The major functions of this post-processor program are introduced and demonstrated, which include mesh plot, contour plot, vector plot, surface plots, cut plot, clip plot, xy-plot and streamline plot as well as view manipulation (translation, rotation, scaling etc).
Development of a Pre-Processing Program for Flow Analysis Based on the Object-Oriented Programming Concept
Myong, Hyon-Kook ; Ahn, Jong-Ki ;
Transactions of the Korean Society of Mechanical Engineers B, volume 32, issue 1, 2008, Pages 70~77
DOI : 10.3795/KSME-B.2008.32.1.070
A pre-processing program based on the OOP(object-oriented programming) concept has been developed. The program consists of the input of a 2D or 3D flow problem to a CFD program by means of an user-friendly interface and the subsequent transformation of this input into a form suitable for the solver(PowerCFD) using unstructured cell-centered method. User-friendly GUI(graphic user interface) has been built on the base of MFC(Microsoft Foundation Class). The program is organized as modules by classes based on VTK(Visualization ToolKit)-library, and these classes are made to function through inheritance and cooperation which is an important and valuable concept of object-oriented programming. The major functions of this program are introduced and demonstrated, which include mesh generation, boundary settings, solver settings, generation of grid connectivity and geometric data etc.