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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
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Comparative Study on the Secondary Flow Measurement in a Turbine Cascade Using 5-hole and 7-hole Probes
Nho, Young-Cheol ; Lee, Yong-Jin ; Park, Jung-Shin ; Kim, Hark-Bong ; Kwak, Jae-Su ;
The KSFM Journal of Fluid Machinery, volume 13, issue 6, 2010, Pages 5~12
DOI : 10.5293/KFMA.2010.13.6.005
Comparative study on the flow measurement by 5-hole and 7-hole probes was conducted in a linear cascade with tip clearances of 2.3%, 3.1%, and 4.4% of the blade span. Calibration range of the 5-hole and the 7-hole probes were
degrees, respectively. Results show that the secondary flow and total pressure loss measured by the 5e-hole and 7-hole probes were similar at small tip clearance cases. However, at the tip clearance of 3.1% and 4.4% of the blade span cases, flow angles exceeding the calibration range of the 5-hole probe were observed. Because of the wider calibration range, larger flow angle by strong leakage vortex could be measured by the 7-hole probe.
Numerical Analysis of the Flow Field of Circular Nozzle Exit Region
Chung, Wui-Jun ; Oh, Sang-Han ; Son, Chang-Ho ;
The KSFM Journal of Fluid Machinery, volume 13, issue 6, 2010, Pages 13~18
DOI : 10.5293/KFMA.2010.13.6.013
The programs of grid generation and flow analysis for the 3-D flow field. were developed. The finer results from numerical analysis could be obtained by using developed programs than those of the experimental data in the flow field of the circular nozzle exit region. Especially A virtual-origin of 3.2 times of nozzle diameter within three percent error inside from nozzle exit plane could be obtained.
Multidisciplinary Design Optimization of 3-Stage Axial Compressorusing Artificial Neural Net
Hong, Sang-Won ; Lee, Sae-Il ; Kang, Hyung-Min ; Lee, Dong-Ho ; Kang, Young-Seok ; Yang, Soo-Seok ;
The KSFM Journal of Fluid Machinery, volume 13, issue 6, 2010, Pages 19~24
DOI : 10.5293/KFMA.2010.13.6.019
The demands for small, high performance and high loaded aircraft compressor are increased in the world. But the design requirements become increasingly complex to design these high technical engines, the requirement of the design optimization become increased. The optimal design result of several disciplines show different tendencies and nonlinear characteristics of the compressor design, the multidisciplinary design optimization method must be considered in compressor design. Therefore, the artificial Neural Net method is adapted to make the approximation model of 3-stage axial compressor design optimization for considering the nonlinear characteristic. At last, the optimal result of this study is compared to that of previous study.
Effects of Silencer Design on the Performance of Jet-fan
Oh, In-Gyu ; Choi, Young-Seok ; Kim, Joon-Hyung ; Yang, Sang-Ho ; Kwon, Oh-Myoung ;
The KSFM Journal of Fluid Machinery, volume 13, issue 6, 2010, Pages 25~29
DOI : 10.5293/KFMA.2010.13.6.025
In this paper, a numerical study has been carried out to investigate the influence of silencer design variables on the performance of a jet fan. In order to achieve an optimum jet fan design and to explain the interactions between the different geometric configurations in the jet fan, three-dimensional computational fluid dynamics and the Design of Experiments method have been applied. Two geometric variables, i.e., cap size and silencer length, were employed to improve the performance of the jet fan. The objective functions of the jet fan are defined as the effective velocity and total efficiency at the operating condition. Based on the results of computational analyses, the flow characteristics were discussed. The effect of silencer with a specific roughness on the performance was also discussed.
Analysis on Performance of Axial Flow Fan for Outdoor Unit of Air-conditioner: Flow Characteristics
Kim, Yong-Hwan ; Jeong, Jin-Hwan ; Lee, Jang-Ho ;
The KSFM Journal of Fluid Machinery, volume 13, issue 6, 2010, Pages 30~35
DOI : 10.5293/KFMA.2010.13.6.030
The aerodynamic performance of axial flow fans for outdoor unit of air-conditioner is investigated by numerical and experimental approaches in this study. The pressure drop and volumetric flow rate are compared each other in several different conditions and fan speeds. It is shown that the predicted fan performances are quite well matched with the experimental results. It is also shown that the curvature of the fan arc and hub height have significant influences on the flow distribution after hub. By the results of this study, it can be suggested that several ways to improve the aerodynamic performance of the axial flow fan can be found using the numerical analysis.
Manufacture and Measurement Uncertainty Analysis of a Venturi Pipe for Airflow Measurement in Altitude Engine Test
Yang, In-Young ; Oh, Joong-Hwan ;
The KSFM Journal of Fluid Machinery, volume 13, issue 6, 2010, Pages 36~41
DOI : 10.5293/KFMA.2010.13.6.036
Design, manufacture and calibration procedures of a venturi pipe flowmeter for airflow measurement in altitude engine test were discussed. Altitude engine test using venturi pipe was given as an example. The venturi was designed per the ISO standard of ISO5167, and was intented to include the entire airflow range in the test envelope of the gas turbine engine. Measurement uncertainty analysis was performed in the design procedure to investigate the effect of venturi geometry and sensor specification upon the measurement uncertainty. Manufacturing process was designed to minimize the deviation from the geometry of design. Calibration was performed to get the relationship between the discharge coefficient and the pipe Reynolds number. Then the uncertainty was assessed again using real data acquired during engine test. Through these procedures, it was possible to maintain the uncertainty of airflow measurement under 1 % for most of the operating envelope of the gas turbine engine. The discharge coefficient of the venturi pipe showed agreement with the value suggested in the ISO standard ISO5167-4 within 0.6 %.
Optimization of a Cooling Channel with Staggered Elliptical Dimples Using Neural Network Techniques
Kim, Hyun-Min ; Moon, Mi-Ae ; Kim, Kwang-Yong ;
The KSFM Journal of Fluid Machinery, volume 13, issue 6, 2010, Pages 42~50
DOI : 10.5293/KFMA.2010.13.6.042
The present analysis deals with a numerical procedure for optimizing the shape of elliptical dimples in a cooling channel. The three-dimensional Reynolds-averaged Navier-Stokes (RANS) analysis is employed in conjunction with the SST model for predictions of the turbulent flow and the heat transfer. Three non-dimensional geometric design variables, such as the ellipse dimple diameter ratio, ratio of the dimple depth to the average diameter, and ratio of the distance between dimples to the pitch are considered in the optimization. Twenty-one experimental points within design space are selected by Latin Hypercube Sampling. Each objective function values at these points are evaluated by RANS analysis and producing optimal point using surrogate model. The linear combination of heat transfer coefficient and friction loss related terms with a weighting factor is defined as the objective function. The results show that the optimized elliptical dimple shape improves considerably the heat transfer performance than the circular dimple shape.
Numerical Analysis on the Effect of Flow Rate Variation in Double-Suction Centrifugal Pump
An, Young-Joon ; Shin, Byeong-Rog ;
The KSFM Journal of Fluid Machinery, volume 13, issue 6, 2010, Pages 51~56
DOI : 10.5293/KFMA.2010.13.6.051
A numerical simulation is carried out to investigate the effect of flow rate variation and performance characteristics of double-suction centrifugal pump. Two types of pump which have different impeller inlet breadth and curvature of the shroud line consist of six blades impeller and shroud ring. Finite-volume method with structured mesh and
Shear Stress Transport turbulence model was used to guaranty more accurate prediction of turbulent flow in the pump impeller. Total head, power and overall efficiency were calculated to obtain performance characteristics of two types of pump according to the variation of flow rate. From the results, impeller having smooth curve along the shroud line obtained good performance. The lower flow rate, the more circulation region, flow unsteadiness and complicate flow pattern are observed. Complicated internal flow phenomena through impellers such as flow separation, pressure loss, flow unsteadiness and performance are investigated and discussed.
Performance evaluation of a steam injected gas turbine CHP system using biogas as fuel
Kang, Do-Won ; Kang, Soo-Young ; Kim, Tong-Seop ; Hur, Kwang-Beom ;
The KSFM Journal of Fluid Machinery, volume 13, issue 6, 2010, Pages 57~62
DOI : 10.5293/KFMA.2010.13.6.057
MW-class gas turbines are suitable for distributed generation systems such as community energy systems(CES). Recently, biogas is acknowledged as an alternative energy source, and its use in gas turbines is expected to increase. Steam injection is an effective way to improve performance of gas turbines. This study intended to examine the influence of injecting steam and using biogas as the fuel on the operation and performance a gas turbine combined heat and power (CHP) system. A commercial gas turbine of 6 MW class was used for this study. The primary concern of this study is a comparative analysis of system performance in a wide biogas composition range. In addition, the effect of steam temperature and injected steam rate on gas turbine and CHP performance was investigated.
Inflow Patterns Around a Water Intake Tower for Selective Withdrawal Depth
Cho, Yong ; Kim, Yong-Yeol ;
The KSFM Journal of Fluid Machinery, volume 13, issue 6, 2010, Pages 63~70
DOI : 10.5293/KFMA.2010.13.6.063
Shallow water withdrawal systems have been replaced with a selected withdrawal system to keep stable raw water quality in spite of occurrence of algae and muddy inflow. Before reconstruction of the water intake tower in Yongdam reservoir supplying water to Gosan water treatment facility, we have predicted flow patterns of inflowing water into the water intake tower for various withdrawal conditions. It has been predicted that the water in the withdrawal layer is significantly inflowed from the front with fast velocity into the water intake tower irrespective of withdrawal depth, while the water away from the withdrawal layer is withdrawed a little from the side with slow velocity.
A Study on Performance of Cooling Fan for Auto Transmission Oil Cooler in the Large-Size Diesel Engine
Yi, Chung-Seob ; Suh, Jeong-Se ; Song, Chul-Ki ; Yun, Ji-Hun ;
The KSFM Journal of Fluid Machinery, volume 13, issue 6, 2010, Pages 71~76
DOI : 10.5293/KFMA.2010.13.6.071
This study has investigated numerically and experimentally the flow characteristic of air-cooling fan for transmission oil cooler in the large-size diesel engine. Impellers of cooler were composed of eight normal-scale and eight small-scale blades in the zig-zag pattern. In order to increase the discharge pressure of cooling fan, turbo type of fan blade is proposed in the impeller for transmission oil cooler. The fluidic performance of cooling fan has been estimated numerically by using the commercial code and experimentally carried out with reference on AMCA Standard 210-99. As a result, it is confirmed that the numerical result for performance curve is in good agreement with experimental data.
A Study on the Flow Characteristic of Lubrication Oil System in Manual Transmission System for Large Commercial Vehicle
Yi, Chung-Seob ; Suh, Jeong-Se ; Song, Chul-Ki ; Shin, Yoo-In ; Yun, Ji-Hun ; Chung, Kyung-Taek ;
The KSFM Journal of Fluid Machinery, volume 13, issue 6, 2010, Pages 77~82
DOI : 10.5293/KFMA.2010.13.6.077
This study has conducted numerical analysis for lubrication system of transmission for commercial vehicle. The lubrication oil system in transmission can be applied to a large scale commercial vehicle which is over 15tons. The flow rate of lubricating oil has been obtained for each of branch port from the lubrication pipe. The results from numerical simulation are mainly suggested for the mass flow rate of lubrication oil in the rotating main shaft of transmission system. It has been found that the mass flow rate from oil hole increased with an rotating rate of main shaft. The flow characteristic from oil hole has been presented for the lubricating system in the manual transmission.