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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
Comparative Study of the Steady State and Transient TSP Techniques in the Heat Transfer Measurement by an Inclined Impingement Jet
Jo, Yong-Hwa ; Nho, Young-Cheol ; Lee, Yong-Jin ; Kwak, Jae-Su ;
The KSFM Journal of Fluid Machinery, volume 15, issue 1, 2012, Pages 5~12
DOI : 10.5293/kfma..2012.15.1.005
In this paper, the heat transfer coefficient measurement techniques using TSP(temperature sensitive paint) were introduced and the results of a comparative study on the heat transfer coefficient measurement by steady state and transient TSP techniques were discussed. The distributions of heat transfer coefficient by a single
inclined impingement jet on a flat surface were measured by both techniques. Tested Reynolds number based on the jet diameter (d) was 30,000 and the distance between jet exit and target plate (L) was fixed at 10d. Results showed that the measured Nusselt number by both techniques indicated significant difference except near the center of impingement jet. Also, the heat transfer coefficients measured by the transient TSP technique were affected by the reference temperature of the jet. Based on the measured data, characteristics of both TSP techniques were analyzed and suggestions for applying them were also given.
Development of Vertical Barrel Type Multistage Pump
Yoo, Il-Su ; Park, Mu-Ryong ; Hwang, Soon-Chan ; Kim, Sung-Ki ; Yoon, Eui-Soo ;
The KSFM Journal of Fluid Machinery, volume 15, issue 1, 2012, Pages 13~20
DOI : 10.5293/kfma..2012.15.1.013
A vertical-axis multistage pump with low specific speed was developed, satisfying performance requirements such as flow rate, total head, and NPSH. The developed pump was designed through conceptual design, configuration design, and performance analysis by CFD which were established in KIMM. The prototype pump's mechanical wholesomeness besides hydraulic performances were verified by running test, performance test, and reliability test.
Rotor Blade Design of a 1MW Class HAWT and Evaluation of Aerodynamic Performance Using CFD Method
Mo, Jang-Oh ; Lee, Young-Ho ;
The KSFM Journal of Fluid Machinery, volume 15, issue 1, 2012, Pages 21~26
DOI : 10.5293/kfma..2012.15.1.021
In this investigation, the aerodynamic performance evaluation of a 1MW class blade has been performed with the purpose of the verification of target output and its clear understanding of flow field using CFD commercial code, ANSYS FLUENT. Before making progress of CFD analysis the HERACLES V2.0 software based on blade element momentum theory was applied for confirmation of quick and approximate performance in the preliminary stage. The blade was designed to produce the target output of a 1MW class at a rated wind speed of 12m/s, which consists of five different airfoils such as FFA W-301, DU91-W250, DU93-W-210, NACA 63418 and NACA 63415 from hub to tip. The mechanical power by CFD is approximately 1.195MW, which is converted into the electrical power of 1.075MW if the system loss is considered to be 0.877.
Numerical Study of Particle Collection and Entrainment in Electrostatic Precipitator
Kim, Ju-Hyeon ; Kweon, Soon-Cheol ; Kwon, Ki-Hwan ; Lee, Sang-Hwan ; Lee, Ju-Hee ;
The KSFM Journal of Fluid Machinery, volume 15, issue 1, 2012, Pages 27~35
DOI : 10.5293/kfma..2012.15.1.027
A numerical simulation for particle collection efficiency in a wire-plate electrostatic precipitator (ESP) has been performed. Method of characteristics and finite differencing method (MOC-FDM) were employed to obtain electric field and space charge density, and lattice boltzmann method (LBM) was used to predict the Electrohydrodynamic (EHD) flow according to the ion convection. Large eddy simulation (LES) was considered for turbulent flow and particle simulation was performed by discrete element method (DEM) which considered field charging, electric force, drag force and wall-collision. One way coupling from FDM to LBM was used with small and low density particle assumption. When the charged particle collided with the collecting plate, particle-wall collision was calculated for re-entertainment effect and the effect of gravity force was considered.
Study on the Control of the Axial Thrust of a Pump for Liquid Rocket Engine Turbopumps
Choi, Chang-Ho ; Noh, Jun-Gu ; Kim, Dae-Jin ; Kim, Jin-Han ;
The KSFM Journal of Fluid Machinery, volume 15, issue 1, 2012, Pages 36~40
DOI : 10.5293/kfma..2012.15.1.036
The magnitude of the axial thrust acting on pump bearings has a great influence on the operational reliability and service life of a pump for turbopumps. In the present study, radial vanes are introduced to the pump casing to control the axial thrust by changing the cavity pressure between the impeller and the casing. To investigate the effect of the vanes on the axial thrust of the pump, experimental and computational studies were performed with and without the vanes. It is shown that the vanes reduce the cavity pressure by preventing the flow from rotating with the impeller. Experimental and computational results show similar trend for the axial thrust difference between two cases with and without the vanes. The results show that the cavity vanes are very effective in controlling the magnitude of the axial thrust.
Effects of Inducer Tip Clearance on the Suction Performance of a Pump for Turbopumps
Choi, Chang-Ho ; Kim, Dae-Jin ; Kim, Jin-Han ;
The KSFM Journal of Fluid Machinery, volume 15, issue 1, 2012, Pages 41~45
DOI : 10.5293/kfma..2012.15.1.041
The effects of inducer tip clearance on the suction performance of a pump for turbopumps are investigated. Experiments for the pump with inducer tip clearances of 1.8% and 1.4% of blade height were performed. The experimental results showed that the suction performance of the pump increased as the tip clearance decreased. It seems that the suction performance of the pump becomes better with smaller tip clearances because the strength of the inducer backflow becomes weak with the decreased tip clearance.
The Study of Structural Stability by Stacking Method of the Axial Blade
Jeong, Cheol-Young ; Ko, Hee-Hwan ; Park, Jun-Young ;
The KSFM Journal of Fluid Machinery, volume 15, issue 1, 2012, Pages 46~51
DOI : 10.5293/kfma..2011.15.1.046
This study is to confirm the deformation of blade when the location of stacking is moving. Also, it desire to determine the most stable location of stacking from the analysis. In the previous study, it is Known that moving the location of stacking is not influence to the aerodynamic performance. In this study SolidWorks premium 2010 SP4 is used for structure analysis. In reference blade and other 3 model analysis, the two mesh type is used, one is standard mesh type in SolidWorks, the other is curvature-based mesh type. The result of curvature-based mesh type is more stable than one of the standard mesh type regardless of mesh size, the number of mesh. The deformation of blade tip is the smallest, when the location of stacking is identical to the center of gravity of the blade section profile. So, if possible is design, this study recommends that the location of stacking is identical to the center of gravity the blade.
Stall Inception Characteristics of Axial Compressor Varying IGV Stagger
Bae, Hyo-Jo ; Lim, Hyung-Soo ; Song, Seung-Jin ; Kang, Shin-Hyoung ; Yang, Soo-Seok ;
The KSFM Journal of Fluid Machinery, volume 15, issue 1, 2012, Pages 52~57
DOI : 10.5293/kfma..2011.15.1.052
Stall inception characteristics are researched to understand stall well. To realize different stall inception patterns, IGV stagger angle was changed. At design IGV stagger angle, spike, which is short length scale, is observed. Decreasing IGV stagger angle, spike changes to mode, which is long length scale, and further decreasing get multi cell. Compressor maps for each IGV stagger are shown to compare different stall inceptions. The characteristics of both spike and mode are confirmed in this experiment. Furthermore, transient from spike to mode is find. multi cell has 4cells and is little bit faster than mode. and multi cell shows 2nd, 3rd characteristics on compressor map.
Unsteadiness of Tip Leakage Flow in an Axial Compressor
Hwang, Yoo-Jun ; Kang, Shin-Hyoung ;
The KSFM Journal of Fluid Machinery, volume 15, issue 1, 2012, Pages 58~63
DOI : 10.5293/kfma..2011.15.1.058
Three dimensional unsteady numerical calculations were performed to investigate unsteadiness of the tip leakage flow in an axial compressor. The first stage of the four-stage low-speed research axial compressor was examined. Since this compressor has a relatively large tip clearance, the unsteadiness of the tip leakage flow is induced. Through the results from the unsteady calculations, the process of the induced unsteady tip leakage flow was investigated. It was shown that the leakage flow that occurred at a rotor blade tip clearance affected the pressure distribution on the pressure side near the tip of the adjacent blade, thus caused the fluctuation of the pressure difference between the pressure side and suction side. Consequently, the unsteady tip leakage flow was induced at the adjacent rotor blade. The unsteady feature of the tip leakage flow was changed as the operating point was moved. The interface between the tip leakage flow and the main flow only affected the trailing edge region at the design point whereas the interface influenced up to the leading edge at the low flow rate point. As the flow rate decreased, additionally, it was seen that the vortex size of the tip leakage flow increased and the relatively large length scale disturbance occurred. On the other hand, using frequency analysis, it was shown that the unsteadiness was not associated with the rotor speed and was about 40% of the blade passing frequency. This feature was explained in the rotor relative frame of reference, and the frequency decreased as the flow rate decreased.
Analysis of Axial Compressor Design Characteristics in Large Class Gas Turbine for Power Generation
Lee, Sung-Ryong ; Song, Jae-Wook ; Kim, Soo-Yong ;
The KSFM Journal of Fluid Machinery, volume 15, issue 1, 2012, Pages 64~69
DOI : 10.5293/kfma..2011.15.1.064
Currently axial flow compressor is used primarily in a large power generation gas turbine. In this paper,the main factors to be considered when designing a axial flow compressor were compared to those of a small power generation gas turbine(DGT-5). The main design parameters was examined in the aspect ratio, solidity, as well as reaction, diffusion factor, incidence angle, etc. The results in case of a small compressor are showed a regular pattern but there were not found any specific design patterns for a large class compressor.