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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
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
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Unstable Flow in a Vaneless Diffuser of 2-Dimensional Centrifugal Compressor
Kang, Kyung-Jun ; Shin, You-Hwan ; Kim, Kwang-Ho ; Lee, Yoon-Pyo ;
The KSFM Journal of Fluid Machinery, volume 14, issue 4, 2011, Pages 5~11
DOI : 10.5293/KFMA.2011.14.4.005
This study investigated on details of flow characteristics in a vaneless diffuser of a compressor with 2-dimensional impeller at various flow rates. Experiment for a low speed compressor model in a water reservoir was performed to analyze the flow field in the vaneless diffuser and volute casing, which was done by PIV measurement. It was also focused on the periodic flow patterns occurring at low flow rate near unstable operating region of the compressor. At low flow rate condition, the flow visualization clearly shows that the flow energy from impeller is highly accumulated at the compressor exit by the blockage effect of a flow damper and consequently the reverse flow occurs in the diffuser.
Burst Test of Volute Casings for Liquid Rocket Turbopump
Yoon, Suk-Hwan ; Jeon, Seong-Min ; Kim, Jin-Han ;
The KSFM Journal of Fluid Machinery, volume 14, issue 4, 2011, Pages 12~18
DOI : 10.5293/KFMA.2011.14.4.012
Volute casings for liquid rocket turbopump are designed and evaluated in a structural point of view. At the design step 3D modeling and finite element analyses are conducted iteratively. During the step various loads such as internal pressure, casing stiffness and mounting forces are considered in the analyses, along with the weight minimization effort. After the design step volute casings are manufactured by metal casting process, and then they are subjected to burst test for structural verification. In the burst test strains at several points are measured and compared with predicted values.
A Experimental Study on the Performance of an Axial-Type Suction-Blowing Fan
Choi, Hyoung-Jun ; Park, Young-Ha ; Ahn, Kook-Young ; Cho, Soo-Yong ;
The KSFM Journal of Fluid Machinery, volume 14, issue 4, 2011, Pages 19~24
DOI : 10.5293/KFMA.2011.14.4.019
An experimental study was conducted to examine the effectiveness of a suction-blowing fan that could not only remove polluted air by suction but also create the air-curtain by blowing. In order to create the air-curtain, rotors were installed on the surface of the shroud. These blows fresh air into the polluted region. The fresh air is spouted backward 45o on the basis of the axial direction using a double-ducted bellmouth. In the same suction operating condition, the suction region was extended by increasing the blowing velocity. However, the increasing rate of suction region was reduced when the blowing velocity was increased steadily. Thus, an efficient blowing velocity should be determined depending on the suction operating condition. In addition, the blowing requires additional input power. In a fixed suction operating condition, the input power was linearly increased in proportion to the blowing flowrate. When the suction-blowing fan was operated in the same input power as the suction fan, the suction region was increased more than 30% based on the 0.6m/sec velocity.
Effects of the Distance between Jet Fans on the Ventilation Performance in a Road Tunnel
Kim, Jung-Yup ;
The KSFM Journal of Fluid Machinery, volume 14, issue 4, 2011, Pages 25~30
DOI : 10.5293/KFMA.2011.14.4.025
The jet fan is generally used to add thrust in the longitudinal ventilation system of road tunnel and the geometric conditions of jet fan such as the distance from tunnel wall have an effect on the performance of ventilation system. Numerical analyses on the flow in tunnel caused by operation of jet fan are presented to study the ventilation characteristics in tunnel. While the distance between jet fans in parallel installed in tunnel is changed 0.5 L/D to 3.0 L/D, the flowrate and mean velocity through tunnel are calculated for each cases. As the distance between jet fans increases, the flowrate through tunnel increases asymptotically and the momentum of tunnel flow is alike.
Study of Butterfly Valve Loss Coefficient Equation
Park, Jong-Ho ; Park, Han-Yung ;
The KSFM Journal of Fluid Machinery, volume 14, issue 4, 2011, Pages 31~37
DOI : 10.5293/KFMA.2011.14.4.031
Linear curve or hyperbolic curve interpolation equations have been used to represent loss coefficient of butterfly valve according to a certain opening(for example, each 10 degree up to 90 degree) so far, and these equations are not precise and inconvenient to use with computer programming. Method of representing loss coefficient of butterfly valve using experiment data with several equations is presented and It is verified that log equation is most precise and convenient to use with computer programming in this research.
Rotordynamic Characteristics Analysis for API 610 BB5 Pump Development
Kim, Byung-Ok ; Lee, An-Sung ; Kim, Sung-Ki ;
The KSFM Journal of Fluid Machinery, volume 14, issue 4, 2011, Pages 38~44
DOI : 10.5293/KFMA.2011.14.4.038
This paper deals with the detail rotordynamic analysis for BB5 eight stages pump as development of API 610 BB5 type pump. Dry-run analytical model, not considering operating fluid, and wet-run analytical model, considering operating fluid are established. In addition, plain circular and pressure dam bearings are chosen and it was discussed that each bearing has an effect on dynamic characteristics of pump rotor system. A rotordynamic analysis includes the critical speed map, Campbell diagram, stability, and unbalance response. As results, it was predicted that rated speed of the pump rotor passes through 1st critical speed in dry-run condition regardless of bearings, however, it was verified that, in wet-run condition, the rotor system doesn`t have critical speeds even if more than twice rated speed. Hence the resonance problem caused by the critical speeds does not happen since actual operating is in wet-run condition including operating fluid. As a result of unbalance response analysis, the pump rotor has stable vibration response at rated speed, regardless of operating fluid and the proposed bearing types.
Performance Improvement of Fan and Duct System for Kimchi Refrigerator
Kim, Joon-Hyung ; Choi, Young-Seok ; Yoon, Joon-Yong ; Park, Sung-Kwan ; Hyun, Seok-Ho ;
The KSFM Journal of Fluid Machinery, volume 14, issue 4, 2011, Pages 45~51
DOI : 10.5293/KFMA.2011.14.4.045
The kimchi refrigerator is the electronic home appliance which is used for the maturing and a custody of the kimchi. In this paper, performance improvement of fan and duct system for kimchi refrigerator has been studied by using a commercial CFD code. In order to achieve a improved fan performance, three-dimensional computational fluid dynamics and the Design of Experiments method have been applied. Additionally, to know the optimized duct inlet shape with the optimized fan, the overall performances were calculated with various duct inlet shapes. The final fan and duct system for kimchi refrigerator showed improved performance in efficiency and total head compared with the existing model.
Development of Small-sized Gas Turbine Engine Control System for Power Generation
Hong, Seong-Jin ; Kim, Seung-Min ; Yook, Sim-Kyun ; Nam, Sam-Sik ;
The KSFM Journal of Fluid Machinery, volume 14, issue 4, 2011, Pages 52~56
DOI : 10.5293/KFMA.2011.14.4.052
Small-sized gas turbine engine could be applied to various fields such as propulsion, power generation, machine driving, etc., and Doosan has been developing 5MW class gas turbine engine for power generation since 2005. To verify its design performance and operating characteristics, a gas turbine engine test facility was constructed, and control system was also established to satisfy rapid and reliable control performance. In this paper, the hardware specification and structure of control system for gas turbine engine are introduced, and test result for starting characteristics analysis and loading is also presented.
Characteristics of Leakage Flow on Regenerative Blower and Leakage-reducing Design for Performance Enhancement
Choi, Min-Ho ; Kim, Young-Hoon ; Kang, Shin-Hyoung ;
The KSFM Journal of Fluid Machinery, volume 14, issue 4, 2011, Pages 57~63
DOI : 10.5293/KFMA.2011.14.4.057
Regenerative blower is suitable for hydrogen recirculation in fuel cell vehicle due to its capability of high pressure rise in single stage. Numerical models were applied to investigate inner gap leakage flow characteristics. A leakage flow in the inner gap is dominantly affected by pressure gradient. Therefore a blower with concentric channel type was suggested as one of modified models for reducing the inner gap pressure gradient. Also numerical results such as pressure rise, efficiency, leakage flow rate and torque were compared between modified and reference models. The performance of concentric channel type was improved as a result of reduced leakage flow.
A Review on Building-Integrated Wind Turbine Design
Kim, Yong-Yee ;
The KSFM Journal of Fluid Machinery, volume 14, issue 4, 2011, Pages 64~69
DOI : 10.5293/KFMA.2011.14.4.064
Integrating wind energy systems into building design is a small but growing trend, and high riese with their elevated wind speeds seem particularly suited to the technology. This paper deal with building-integrated wind turbine design. It thus contains two topics: wind energy and building design. Several building-integerated wind turbine design have been categorized and reviewed.