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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
Design and Flow Analysis on the 1kW Class Horizontal Axis Wind Turbine Rotor Blade for Use in Southwest Islands Region
Lee, Jun-Yong ; Choi, Nak-Joon ; Yoon, Han-Yong ; Cho, Young-Do ;
The KSFM Journal of Fluid Machinery, volume 15, issue 3, 2012, Pages 5~11
DOI : 10.5293/kfma.2012.15.3.005
This study is to develop a 1kW-class horizontal axis wind turbine(HAWT) rotor blade which will be applicable to relatively low wind speed regions in southwest islands in Korea. Shape design of 1kW-class small wind turbine rotor blade is carried out using a blade profile with relatively high lift to drag ratio by blade element momentum theory(BEMT). Aerodynamic analysis on the newly designed rotor blade is performed with the variation of tip speed ratio. Power coefficient and pressure coefficient of the designed rotor blade are investigated according to tip speed ratio.
Stress Based Node Refill Model for Lattice-Boltzmann Method on Fluid-Structure Interaction Problems
Shin, Jae-Ho ; Lee, Sang-Hwan ; Lee, Ju-Hee ;
The KSFM Journal of Fluid Machinery, volume 15, issue 3, 2012, Pages 12~18
DOI : 10.5293/kfma.2012.15.3.012
The Lattice Boltzmann Method has developed for solving the Boltzmann equation in Cartesian domains containing immersed boundaries of arbitrary geometrical complexity moving with prescribed kinematics. When a immersed boundaries are sweeping the fixed fluid node, refilling the node information in a vicinity of fluid nodes is one of the important issues in Lattice Boltzmann Method. In this study, we propose a simple refill algorithm for the particle distribution function based on a proper velocity, density and strain rate to enhance accuracy and stability of the method. The refill scheme based on a asymptotic analysis of LBGK model has improved accuracy than interpolation schemes. The proposed scheme in this study is validated by the simulations of an impulsively started rotating circular cylinder to investigate adaptability for fluid-structure interaction (FSI) problem. This refill scheme has improved stability and accuracy especially at high Reynolds number region.
Aerodynamic Design and Analysis on 1600kW Class Propeller Blade
Choi, Won ; Kim, Kwang-Hae ; Won, Young-Su ; Lee, Won-Joong ;
The KSFM Journal of Fluid Machinery, volume 15, issue 3, 2012, Pages 19~24
DOI : 10.5293/kfma.2012.15.3.019
Propeller shall have high efficiency and improved aerodynamic characteristics to get the thrust to fly at high speed for the turboprop aircraft. That is way Clark-Y airfoil which is used to conventional 1600kW class aircraft propeller is selected as a blade airfoil. Adkins method is used for aerodynamic design and performance analysis with respect to the propeller design point. Adkins method is based on the vortex-blade element theory which design the propeller to satisfy the condition for minimum energy loss. propeller geometry is generated by varying chord length and pitch angle at design point of turboprop aircraft. The propeller design results indicate that is evaluated to be properly constructed, through analysis of propeller aerodynamic characteristics using the Meshless method and MRF, SM method.
A Computational Study on the Pressure Loss of Intake System for the Combat Vehicle
Moon, Seong-Mok ; An, Su-Hong ; Lee, Kyoung-Hoon ; Woo, Kwan-Je ;
The KSFM Journal of Fluid Machinery, volume 15, issue 3, 2012, Pages 25~31
DOI : 10.5293/kfma.2012.15.3.025
A computational study on the improvement of the pressure loss of intake system, which is located at engine manifold of the combat vehicle, has been conducted using a finite-volume-based, Reynolds-Averaged Navier-Stokes (RANS) solver. The computational result of the pressure loss through the air cleaner is in good agreement with equivalent experimental data. A parametric study was done for improving of the pressure loss of intake system over the baseline case. The effects of five primary parameters such as the height of inlet, the width of interconnection pipe, the shape of drain chamber and the diameter of filter housing were considered in this study. Consequently, this computational investigation can contribute to finding an optimal guideline for the idea of improvement in the pressure loss of intake system.
The Study on Design of the 5kW Class Inline Micro-Turbine
Park, Sang-Eun ; Roh, Hyung-Woon ;
The KSFM Journal of Fluid Machinery, volume 15, issue 3, 2012, Pages 32~38
DOI : 10.5293/kfma.2012.15.3.032
This paper is aimed to propose the design database(DB) of the inline micro-turbine for 5kW class. CFD analysis is performed to investigate the effect of a turbine on each parameter. This study showed that RadhaKrishna's data is different from the 5kW class in the low-head and the micro-turbine. Therefore, new DB for the design of inline micro-turbine for 5kW class could be needed. This study configured new design DB for the design of inline micro-turbine for 5kW class. The DB of this study showed that the optimal hub ratio(Dp/DR), the optimal body ratio(Db/DR) and the optimal range of body length ratio(Lh/DR) is 50%, 1.1 and 2.3 to 2.9, respectively.
Design Optimization of a Centrifugal Pump Impeller using RSM and Design of Volute
Pyun, Kwon-Bum ; Kim, Joon-Hyung ; Choi, Young-Seok ; Yoon, Joon-Yong ;
The KSFM Journal of Fluid Machinery, volume 15, issue 3, 2012, Pages 39~45
DOI : 10.5293/kfma.2012.15.3.039
In this study, optimization of the impeller and design of volute were carried out in order to improve the performance of a centrifugal pump. Design parameters from vane plane development for impeller design were selected, and effect of the design parameters on the performance of the pump was analyzed by using Response Surface Methodology(RSM) to optimized impeller. In addition, total pump design method was suggested by designing volute which was suitable for the optimized impeller through volute design where Stepanoff theory was applied and numerical analysis.
Experimental Study on Effect of Electrode Material and Thickness in a Dielectric Barrier Discharge Plasma Actuator Performance
Lee, Seung-Yeob ; Shin, You-Hwan ;
The KSFM Journal of Fluid Machinery, volume 15, issue 3, 2012, Pages 46~50
DOI : 10.5293/kfma.2012.15.3.046
Plasma actuator makes parallel flow on the wall surface by the interaction between plasma and neutral air particles. Dielectric barrier discharge (DBD) plasma actuator is widely studied as one type of plasma actuators, which consists of one electrode exposed to the environmental gas and the other encapsulated by a dielectric material. This paper is experimentally focused on the performance of DBD plasma actuator mounted on a flat plate, which depends on kinds of the electrode materials, their thicknesses and the supplied voltage including its frequency. We measured the velocity magnitudes of the induced flow by a stagnation probe as a performance parameter of the plasma actuators. The velocity profiles of the flow induced by the plasma actuators are similar in all measurement cases. The magnitude of the induced velocity is strongly influenced by the thickness of the electrodes and the frequency of the input voltage. The performance of DBD plasma actuators is related to the electric properties of the electrode materials such as the ionization energy and the electrical resistivity.
Operating Characteristics Study of a Small Gas/Steam Turbine Combined System Using Biogas
Kang, Do-Won ; Shin, Hyun-Dong ; Kim, Tong-Seop ; Hur, Kwang-Beom ; Park, Jung-Keuk ;
The KSFM Journal of Fluid Machinery, volume 15, issue 3, 2012, Pages 51~56
DOI : 10.5293/kfma.2012.15.3.051
This study analyzed the influence of firing biogas on the performance and operation of a gas/steam turbine combined system. A reference gas/steam turbine combined system, designed with biogas fuel(57% volumetric methane) was set up and off-design simulation was made to investigate operating characteristics when a couple of operating schemes to mitigate turbine blade overheating were applied. Performance at base-load operation using each scheme was compared and part load operation using the variable inlet guide vane was analysed. Also, differences in operating characteristics and performance caused by changes in the methane content of biogas and ambient temperature were examined.
Performance Variation of a Combined Cycle Power Plant by Coolant Pre-cooling and Fuel Pre-heating
Kwon, Ik-Hwan ; Kang, Do-Won ; Kim, Tong-Seop ; Kim, Jae-Hwan ;
The KSFM Journal of Fluid Machinery, volume 15, issue 3, 2012, Pages 57~63
DOI : 10.5293/kfma.2012.15.3.057
Effects of coolant pre-cooling and fuel pre-heating on the performance of a combined cycle using a F-class gas turbine were investigated. Coolant pre-cooling results in an increase of power output but a decrease in efficiency. Performance variation due to the fuel pre-heating depends on the location of the heat source for the pre-heating in the bottoming cycle (heat recovery steam generator). It was demonstrated that a careful selection of the heat source location would enhance efficiency with a minimal power penalty. The effect of combining the coolant pre-cooling and fuel pre-heating was also investigated. It was found that a favorable combination would yield power augmentation, while efficiency remains close to the reference value.
Numerical Prediction of a Performance Change in a Compressor Shrouded Impeller with Cavity Leakage Flow
Choi, Min-Uk ; Joo, Won-Gu ; Park, Jun-Young ; Yoon, Eui-Soo ; Choi, Sang-Kyu ;
The KSFM Journal of Fluid Machinery, volume 15, issue 3, 2012, Pages 64~69
DOI : 10.5293/kfma.2012.15.3.064
Generally the Shrouded type impeller is considered to free from the loss of tip leakage flow, but it is actually not possible to complete sealing between the rotating impeller and the sealing which is stay still. As a result, there is the possibility of flow leaking between impeller exit to entrance, especially with high pressure ratio compressor machine. The Cavity leakage flow is expected to influence negative effect on a machine performance and also inner flow structure. In this study, Impeller with shroud-casing gap leakage flow is simulated by numerical method (Using CFX 12.1). The influence of leakage flow on compressor performance and efficiency will be analysed, also detail flowfield change will posted.