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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 13, Issue 6 - Dec 2010
Volume 13, Issue 5 - Oct 2010
Volume 13, Issue 4 - Aug 2010
Volume 13, Issue 3 - Jun 2010
Volume 13, Issue 2 - Apr 2010
Volume 13, Issue 1 - Feb 2010
Selecting the target year
Flow Characteristics of a Primary Cooling System in 5 MW Research Reactor
Park, Young-Chul ; Lee, Young-Sub ;
The KSFM Journal of Fluid Machinery, volume 13, issue 5, 2010, Pages 5~10
DOI : 10.5293/KFMA.2010.13.5.005
5MW, open pool type research reactor, is commonly used to education and experimental purpose. It is necessary to prepare a standardization of system designs for considering a demand. HANARO has prepared the standardization of 5MW research reactor system designs based on the design, installation, commissioning and operating experiences of HANARO. For maintaining an open pool type reactor safety, a primary cooling system (after below, PCS) should remove the heat generated by the reactor under a reactor normal operation condition and a reactor shutdown condition. For removing the heat generated by the reactor, the PCS should maintain a required coolant flow rate. For a verification of the required flow rate, a flow network analysis of the PCS was carried under a normal operating condition. Based on the flow network analysis result, this paper describes the PCS flow characteristics of a 5MW open pool type research reactor. Through the result, it was confirmed that the PCS met design requirements including design flow rate without cavitation.
Internal Flow Analysis on a Mixed Flow Pump for Developing Marine Mineral Resources
Lee, J.W. ; Choi, Y.D. ; Lee, Y.H. ; Yoon, C.H. ; Park, J.M. ;
The KSFM Journal of Fluid Machinery, volume 13, issue 5, 2010, Pages 11~16
DOI : 10.5293/KFMA.2010.13.5.011
The development of lifting pumps that lift minerals to a mining vessel are one of the vital parts of the commercial mining process. The purpose of this study is to investigate internal flow and its effect on the performance of a mixed flow pump in order to improve the pump`s performance. Numerical analysis was performed by commercial code of ANSYS CFX-11 based on flow rate and length of flexible hose. The rated rotational speed of the impeller is 1750rpm. For taking into account the turbulence, k-
SST model was selected to guarantee more accurate prediction of flow separation. The simulated results are in good agreement with the experimental results and showed that its efficiency and the head of the pump are related mainly to the flow rate and the length of flexible hose. A lesser flow rate caused more secondary flow through the guide vane passage. The length of flexible hose and flow rate exert much more influence on the pump`s performance than the shape of the flexible hose.
Two-dimensional numerical simulation of volumetric gear pump flow
Lee, Jung-Ho ; Park, Jong-Won ; Kim, Tae-Goo ; Lee, Sang-Wook ;
The KSFM Journal of Fluid Machinery, volume 13, issue 5, 2010, Pages 17~21
DOI : 10.5293/KFMA.2010.13.5.017
A volumetric gear pump is often used in extensive industrial applications to provide both high pressure and sufficiently high flow rate by physical displacement of finite volume of fluid with each revolution. To better understand the unsteady flow characteristics within the pump, numerical simulations were conducted by using moving dynamic meshing (MDM) techniques in commercially available CFD software, FLUENT. The effects of rotor clearance size and rotational speed of rotor on the flow characteristics, specially the temporal variation of velocity and pressure field, which is a main source of flow noise, was investigated. The results showed that significant reverse flow is developed in the rotor clearance and that its size is one of the most important factors affecting flow characteristics and pressure pulsation.
A Study on Flow and Heat Transfer in One Directional Periodic-Oscillating Cylinder
Park, Jun-Sang ;
The KSFM Journal of Fluid Machinery, volume 13, issue 5, 2010, Pages 22~28
DOI : 10.5293/KFMA.2010.13.5.022
A study has been made of cool-down process on an incompressible fluid contained in a periodically oscillating cylinder when an abrupt cooling of wall temperature is imposed. Characteristics of flow and heat transfer are investigated along the variations of oscillating frequency and amplitude. One found the flow regimes are divided into 4-modes : 1 thermal island mode, 2 thermal island mode, 4 thermal island mode and asymmetry mode. Comprehensive analysis for each mode are given with a physical mechanism on cool-down process.
Analysis on Performance of Axial Flow Fan for Outdoor Unit of Air-conditioner: Noise Characteristics
Kim, Yong-Hwan ; Lee, Jang-Ho ;
The KSFM Journal of Fluid Machinery, volume 13, issue 5, 2010, Pages 29~34
DOI : 10.5293/KFMA.2010.13.5.029
In this paper, aerodynamic noise of axial flow fans for outdoor unit of air-conditioner was analyzed by both experiment and numerical simulation. The three-dimensional incompressible turbulent flow was predicted by the commercial computational fluid dynamics code SC/Tetra, while the aeroacoustic noise of an axial flow fan was predicted by FlowNoise. Computations and experiments were performed with two types of axial flow fans, in which very different noise source distributions were presented. The results obtained from this study are expected to show the way to reduce the noise of axial flow fans in industrial applications.
Development of Rotordynamic Analytical Model and Analysis of Vibration Response of a Turbocharger
Kim, Byung-Ok ; Lee, An-Sung ;
The KSFM Journal of Fluid Machinery, volume 13, issue 5, 2010, Pages 35~42
DOI : 10.5293/KFMA.2010.13.5.035
This paper deals with the development of analytical model of a turbocharger and its detail rotordynamic analysis. Two analytical models, which are verified by experimental modal testing, are proposed and the analytical model including rotor shaft extended to compressor and turbine wheel end side is chosen. A rotordynamic analysis includes the critical map, Campbell diagram, stability, and unbalance response, especially nonlinear transient response considering nonlinear fluid film force at bearings. Although the linearized analysis accurately predicts the critical speeds, stability limit, and stability threshold speed, the predicted vibration results are not valid for speeds above the stability threshold speed since the rotor vibrates with a subsynchronous component much larger than the one synchronous with rotor speed. Hence, for operating speed above the stability threshold, a nonlinear transient analysis considering nonlinear fluid film force must be performed in order to accurately predict vibration responses of rotor and guarantee results of analysis.
Optimization of a Rotating Two-Pass Rectangular Cooling Channel with Staggered Arrays of Pin-Fins
Moon, Mi-Ae ; Kim, Kwang-Yong ;
The KSFM Journal of Fluid Machinery, volume 13, issue 5, 2010, Pages 43~53
DOI : 10.5293/KFMA.2010.13.5.043
This study investigates a design optimization of a rotating two-pass rectangular cooling channel with staggered arrays of pin-fins. The radial basis neural network method is used as an optimization technique with Reynolds-averaged Navier-Stokes analysis of fluid flow and heat transfer with shear stress transport turbulent model. The ratio of the diameter to height of the pin-fins and the ratio of the streamwise spacing between the pin-fins to height of the pin-fin are selected as design variables. The optimization problem has been defined as a minimization of the objective function, which is defined as a linear combination of heat transfer related term and friction loss related term with a weighting factor. Results are presented for streamlines, velocity vector fields, and contours of Nusselt numbers, friction coefficients, and turbulent kinetic energy. These results show how fluid flow in a two-pass square cooling channel evolves a converted secondary flows due to Coriolis force, staggered arrays of pin-fins, and a
turn region. These results describe how the fluid flow affects surface heat transfer. The Coriolis force induces heat transfer discrepancy between leading and trailing surfaces, having higher Nusselt number on the leading surface in the second pass while having lower Nusselt number on the trailing surface. Dean vortices generated in
turn region augment heat transfer in the turning region and in the upstream region of the second pass. As the result of optimization, in comparison with the reference geometry, thermal performance of the optimum geometry shows the improvement by 30.5%. Through the optimization, the diameter of pin-fin increased by 14.9% and the streamwise distance between pin-fins increased by 32.1%. And, the value of objective function decreased by 18.1%.
Optimization of Waste Pneumatic Transportation System by Results of Facility Diagnosis
Chung, Won-Sik ;
The KSFM Journal of Fluid Machinery, volume 13, issue 5, 2010, Pages 54~57
DOI : 10.5293/KFMA.2010.13.5.054
The purpose of this article is to diagnosis all aspects of waste pneumatic transportation system, in order to provide everyone interested in the subject with a optimal design and management of the system. The results of the analyzed inlet boxes were especially designed for customers` convenience and automatically operation, side air intake, ensure good wear. And key of pipelines were showed design standard as degree of an angle. Also, the system is mostly equipped with automatic control and watch conducted inside the waste collection facilities, and it will cut down excessive manpower and be able to be managed by least trained personnel.
Optimal design and operation of a turbo blower used for refuse collection system
Jang, Choon-Man ;
The KSFM Journal of Fluid Machinery, volume 13, issue 5, 2010, Pages 58~63
DOI : 10.5293/KFMA.2010.13.5.058
Optimal operation of turbo blowers connected in serial is analyzed by experimental measurements and numerical simulation with three-dimensional Navier-Stokes equations. The turbo blower system considered in the present study is widely used for the refuse collection system. Design optimization of the turbo blower using some design variables is also studied to enhance the performance of the blower. Throughout numerical simulation, it is found that the input energy reduction by optimal operation of the turbo blowers with the proper changes of the rotor`s rotating frequency can be reduced a input energy for operating the blower system compared to the conventional on-off operation method theoretically. It is also found that the optimal design method is effective to enhance the performance of the turbo blower.