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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
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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
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A Basic Study on the Aero-acoustic Noise Characteristics around a Circular Cylinder using the Large Eddy Simulation
Mo, Jang-Oh ; Lee, Young-Ho ;
The KSFM Journal of Fluid Machinery, volume 13, issue 3, 2010, Pages 5~11
DOI : 10.5293/KFMA.2010.13.3.005
As a basic study of the aero-acoustic noise, Large eddy simulations were carried out for a fixed circular cylinder at Renolds number (Re=
) using commercial CFD code, FLUENT. The subgrid-scale turbulent viscosity was modeled by Smagorinsky-Lilly model adapted to structured meshes. The results of analysis showed that time-averaged value,
is approximately 1.47 which is considerably adjacent with the experimentally measured value of 1.32 in comparison to the values performed by previous researchers. It is observed that there are the very small acoustic pressure fluctuation with the same frequency of the Karman vortex street.
Investigation of Orifice delta pressure abnormal condition for measuring Main Feed Water Flow in Nuclear Power Plant
Lee, Woo-Kwang ; Kim, Kye-Yun ; Ko, Woo-Sig ;
The KSFM Journal of Fluid Machinery, volume 13, issue 3, 2010, Pages 12~17
DOI : 10.5293/KFMA.2010.13.3.012
The orifice establishment which is improper does to change the entity differential pressure and occurs an error in flow measurement data. Because of this, the thermal power of nuclear power plant could be evaluated excessively and the safety margin could be decreased. In this paper, characters of orifice which is established abnormally was investigated. Specially, the orifice plate which is established in opposition case was modeled and analyzed. Finally, 14.4% was lowly measured differential pressure, when being established in the resultant opposition. And this result with EPRI and NRC experiences was similar.
Vibration Response Analysis of a Small Gas Turbine Rotor
Kim, Young-Cheol ; Ha, Jin-Woong ; Myung, Ji-Ho ;
The KSFM Journal of Fluid Machinery, volume 13, issue 3, 2010, Pages 18~23
DOI : 10.5293/KFMA.2010.13.3.018
This paper predicts the unbalance and transient (start-up) response of a 5MW industrial gas turbine by using commercial rotordynamic tool, DYNAMICS 4.3. The gas turbine is operated at 12,975rpm on squeeze film dampers or tilting pad bearings. The stiffness and damping coefficients of the squeeze film dampers and tilting pad bearings are estimated. It is seen that the vibration amplitude of the gas turbine rotor is sufficiently small around the critical speeds and at the rated speed.
Parametric Design of Axial Fan for Air-Conditioning Unit in terms of Aerodynamic Performance and Noise Level
Lee, Seung-Jin ; Choi, Go-Bong ; Cho, Hong-Jun ; Song, Woo-Seog ; Lee, Seung-Bae ;
The KSFM Journal of Fluid Machinery, volume 13, issue 3, 2010, Pages 24~29
DOI : 10.5293/KFMA.2010.13.3.024
Axial fans for an air-conditioning unit are designed to equip the system with an expected flow-rate and low noise level by applying the blade design method of multi-sectioning and local camber generation. In this study, the distributions of chord length, stagger angle, and camber angle are globally and locally determined for the given specific speed, which is considered to be relatively high. The mock-up fans are observed to satisfy the aerodynamic performance and the noise level for the system simultaneously and discussed in terms of local flow patterns related to the emitted noise.
Effect of channel height on the heat transfer coefficient of a rotation dimpled channel
Kim, Seok-Beom ; Lee, Yong-Jin ; Choi, Eun-Yeong ; Jeon, Chang-Soo ; Kwak, Jae-Su ;
The KSFM Journal of Fluid Machinery, volume 13, issue 3, 2010, Pages 30~36
DOI : 10.5293/KFMA.2010.13.3.030
The detailed heat transfer coefficients on a rotating dimpled channel were measured by the hue detection based the transient liquid crystal technique. The dimples were fabricated on the one side of the channel and the tested channel aspect ratio was 4, 6, and 12 with fixed channel width. Tested Reynolds number based on the channel hydraulic diameter was varied from 21,000 to 47,000. A stationary case and two different rotating conditions were tested so that the dimple fabricated surface became leading or trailing surface. For all rotating conditions, the minimum averaged heat transfer coefficient was measured for the channel aspect ratio of 6. Generally, the highest averaged heat transfer coefficient was observed for the highest aspect ratio cases due to increased dimple induced vortex strength.
Effect of Cut-off Angle on Flow Pattern of Centrifugal Multi-blade Fan
Kang, Kyung-Jun ; Shin, You-Hwan ; Lee, Yoon-Pyo ; Kim, Kwang-Ho ;
The KSFM Journal of Fluid Machinery, volume 13, issue 3, 2010, Pages 37~42
DOI : 10.5293/KFMA.2010.13.3.037
This study investigated on details of flow characteristics of a multi-blade fan for domestic ventilation. Experiments and analysis were carried out to describe on flow pattern with variations of cut-off angle near the scroll housing throat, which were performed by PIV measurement for the flow field and by total pressure probes. The stagnation point at cut-off region of the fan moves to the exit of the scroll housing as the cut-off angle increases. The movement of stagnation point and the variation of throat area of the scroll housing influence to the distribution of velocity magnitude at the exit of the fan. Furthermore, a large distortion of the velocity distribution at the scroll exit causes to increase mixing loss along the flow path.
Analysis of Rotordynamic Design Characteristics and Vibration Reduction of an Air Turbo Compressor for Oxygen Plant
Kim, Byung-Ok ; Lee, An-Sung ;
The KSFM Journal of Fluid Machinery, volume 13, issue 3, 2010, Pages 43~48
DOI : 10.5293/KFMA.2010.13.3.043
In this study rotordynamic characteristics of an air turbo-compressor (ATC) used in oxygen plant are analyzed and its operating-speed balancing is performed to solve the vibration trouble caused by rotor unbalance. Three dimensional model of the ATC rotor is completed and then analytical FE (finite element) model, which is verified by experimental modal testing, is developed. A rotordynamic analysis includes the critical map, Campbell diagram, and unbalance response, especially considering the pedestal housings supporting tilting pad bearings. A test run of operating-speed, using tilting-pad bearing of actual use, showed that the vibration level increased very sharply as approaching the rated speed. The operating-speed balancing specified by API 684 was carried out by using influence coefficient method. The results showed that the vibrations at the bearing pedestal housings represented good levels of 0.1 mm/s. From the test run and operating-speed balancing, the analytical results, that is, critical speeds are in good agreement with the test results and unbalance responses introducing the correction masses are similar to the as-is test responses in its aspect.
Numerical Simulation of Cavitating Flow Around Turbopump Inducer
Choi, Chang-Ho ; Noh, Jun-Gu ; Kim, Jin-Han ;
The KSFM Journal of Fluid Machinery, volume 13, issue 3, 2010, Pages 49~53
DOI : 10.5293/KFMA.2010.13.3.049
The computational studies on the cavitating flow around a turbopump inducer were performed to see the effect of the cavitation on the performance of the inducer. The development of cavities around the inducer blades and the head drop of the inducer are observed as the inlet pressure reduces. The change of the backflow at the inducer inlet is also observed with the development of the cavities. The size of the backflow reduces as the inlet pressure is reduced due to the development of the cavities around the blades. The predicted suction performances of the inducer were compared with the experimental results. The results show that the computations overestimate the suction performances of the inducer than the experiments.
Optimal Piping Network Design of Pneumatic Waste Collection System
Sung, Sun-Kyung ; Suh, Sang-Ho ;
The KSFM Journal of Fluid Machinery, volume 13, issue 3, 2010, Pages 54~58
DOI : 10.5293/KFMA.2010.13.3.054
The pneumatic waste collection system, which is a complete solution for solving the waste collection problems, are constructed in many countries all over the world. However, research data for piping network design are insufficient. In this paper the pressure losses of the straight and curved pipes, pipe junctions are obtained using the numerical method in order to investigate the optimal pipe network design for the waste collection system. As an experimental result, the length of 1.8 meter is the reasonable for the radius of curvature of a curved pipe and the angle of 30 degree is suitable for confluent pipe.
Numerical and Experimental Analysis of Tunnel Flow Induced by Jet Fan
Kim, Jung-Yup ; Yang, Sang-Ho ;
The KSFM Journal of Fluid Machinery, volume 13, issue 3, 2010, Pages 59~64
DOI : 10.5293/KFMA.2010.13.3.059
To analyze the three-dimensional flow in tunnel caused by operation of jet fan, both experimental and computational studies have been conducted. The experimental analysis of tunnel flow induced by jet fan is conducted on a real-scale apparatus with jet fan and tunnel, and air velocity at the monitoring points is measured for variation of fan's RPM. The three-dimensional numerical analysis including tunnel and jet fan is carried out for the same geometric configuration as the experimental analysis. The experimental and computational results are compared to examine the applicability of the numerical method.