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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 17, Issue 6 - Dec 2014
Volume 17, Issue 5 - Oct 2014
Volume 17, Issue 4 - Aug 2014
Volume 17, Issue 3 - Jun 2014
Volume 17, Issue 2 - Apr 2014
Volume 17, Issue 1 - Feb 2014
Selecting the target year
CMC Evaluation of Flowmeter Calibration System for Liquid
Lee, Dong-Keun ; Kim, Jong-Seob ; Park, Tae-Jin ; Park, Jong-Ho ;
The KSFM Journal of Fluid Machinery, volume 17, issue 4, 2014, Pages 5~10
DOI : 10.5293/kfma.2014.17.4.005
It is possible for the nation's largest flowmeter calibration system in K-water to calibrate flow rate up to
and diameter 800mm. However, the calibration and measurement capability of K-water's system is not satisfied in comparison with other developed countries. In this study, we find the dominant factors related to the uncertainty of weight and time measurement for gravimetric flowmeter calibration system. As a results of improving the system, the combined standard uncertainty has been improved
. So calibration and measurement capability got 0.08 percent of the relative expanded uncertainty for maximum flow rate using the coverage factor(k=2).
The Static Structural Design and Test of High Speed Propeller Blade
Park, Hyun-Bum ; Choi, Won ;
The KSFM Journal of Fluid Machinery, volume 17, issue 4, 2014, Pages 11~18
DOI : 10.5293/kfma.2014.17.4.011
The recent high speed propeller with blade sweep is required to have high strength to get the thrust to fly at high speed. The high stiffness and strength carbon/epoxy composite material is used for the major structure and skin-spar-foam sandwich structural type is adopted for advantage in terms of the blade weight. As a design procedure for the present study, the structural design load is estimated through investigation on aerodynamic load and then flanges of spars from major bending loads and the skin from shear loads are sized using the netting rule and Rule of Mixture. In order to investigate the structural safety and stability, stress analysis is performed by finite element analysis code MSC. NASTRAN. It is found that current methodology of composite structure design is a valid method through the static structural test of prototype blade.
Optimization of Micro Hydro Propeller Turbine blade using NSGA-II
Kim, Byung-Kon ;
The KSFM Journal of Fluid Machinery, volume 17, issue 4, 2014, Pages 19~29
DOI : 10.5293/kfma.2014.17.4.019
In addition to the development of micro hydro turbine, the challenge in micro hydro turbine design as sustainable hydro devices is focused on the optimization of turbine runner blade which have decisive effect on the turbine performance to reach higher efficiency. A multi-objective optimization method to optimize the performance of runner blade of propeller turbine for micro turbine has been studied. For the initial design of planar blade cascade, singularity distribution method and the combination of the Bezier curve parametric technology is used. A non-dominated sorting genetic algorithm II(NSGA II) is developed based on the multi-objective optimization design method. The comparision with model test show that the blade charachteristics is optimized by NSGA-II has a good efficiency and load distribution. From model test and scale up calculation, the maximum prototype efficiency of the runner blade reaches as high as 90.87%.
Performance Improvement of Very Low Head Cross Flow Turbine with Inlet Open Duct
Chen, Zhenmu ; Singh, Patrick Mark ; Choi, Young-Do ;
The KSFM Journal of Fluid Machinery, volume 17, issue 4, 2014, Pages 30~39
DOI : 10.5293/kfma.2014.17.4.030
The cross flow turbine is economical because of its simple structure. For remote rural region, there are needs for a more simple structure and very low head cross flow turbines. However, in this kind of locations, the water from upstream always flows into the turbine with some other materials such as sand and pebble. These materials will be damage to the runner blade and shorten the turbine lifespan. Therefore, there is a need to develop a new type of cross flow turbine for the remote rural region where there is availability of abundant resources. The new design of the cross flow turbine has an inlet open duct, without guide vane and nozzle to simplify the structure. However, the turbine with inlet open duct and very low head shows relatively low efficiency. Therefore, the purpose of this study is to optimize the shape of the turbine inlet to improve the efficiency, and investigate the internal flow of a very low head cross flow turbine. There are two steps to optimize the turbine inlet shape. Firstly, by changing the turbine open angle along with changing the turbine inlet open duct bottom line (IODBL) location to investigate the internal flow. Secondly, keeping the turbine IODBL location at the maximum efficiency achieved at the first step, and changing the turbine IODBL angle to improve the performance. The result shows that there is a 7.4% of efficiency improvement by optimizing turbine IODBL location (open angle), and there is 0.3% of efficiency improvement by optimizing the turbine IODBL angle.
Operating Characteristics of Serially Connected Centrifugal Blowers Used for Automated Vacuum Waste Collection System
Jang, Choon-Man ; Lee, Jong-Sung ;
The KSFM Journal of Fluid Machinery, volume 17, issue 4, 2014, Pages 40~46
DOI : 10.5293/kfma.2014.17.4.040
This paper describes blower performance characteristics of a automated vacuum waste collection system. Blowers serially connected to six or seven centrifugal blowers are evaluated by experimental measurements to understand blower performances according to blower numbers operated. Two different blowers and duct diameters connected to the main blowers are considered. Data acquisition system is introduced to measure pressure and pressure difference at the main duct simultaneously, which is connected to several blowers serially. A auxiliary blower, which is installed between a filter room and an air deodorizing apparatus, is also added to simulate its performance effect on the main blower. Throughout the experimental measurements of the blower system, it is found that pressure and inlet velocity at the upstream of a blower increase 3.7 and 2.4 times separately by increasing the operating blower numbers from one to seven. It is noted that blower efficiency and pressure measured at the system vary according to the distance between a air intake and a blower system. Auxiliary blower is effective to increase blower inlet suction pressure, while total energy consumption is increased relatively.
Put Effect of the inducer scale on the suction performance similarity of a turbopump
Kang, Byung Yun ; Kang, Shin-Hyoung ;
The KSFM Journal of Fluid Machinery, volume 17, issue 4, 2014, Pages 47~52
DOI : 10.5293/kfma.2014.17.4.047
An inducer is forward-attached to an impeller to improve the suction performance. This paper described the experimental and numerical investigations on the concept of NPSH similarity about the inducer scale. As Reynolds number decreased for the same scale inducer, the hydraulic performance is slightly reduced because of the viscosity. The suction performance similarity is in good agreement. For different scale inducers, the NPSH similarity did not follow the conventional rule which is proportional to the square of the inducer diameter. A cavity of two times scale inducer grows faster under cavitation inception, and the head is more drop as the fluid passes blades. Because of the simplified cavitation model and vapor pressure, the NPSH similarity dose not have an accuracy. This study suggested an empirical formula for the NPSH similarity.
A Numerical Study on the Performance Evaluation of the Vacuum Pump for Waste Treatment
Lee, Him-Chan ; Kim, Joon-Hyung ; Yoon, Joon-Yong ; Kim, Chang-Jo ; Choi, Young-Seok ;
The KSFM Journal of Fluid Machinery, volume 17, issue 4, 2014, Pages 53~58
DOI : 10.5293/kfma.2014.17.4.053
Vacuum pump transfers waste that is pulverized by integrated macerator. For this reason, unlike ordinary pump systems, there is a rotating macerator ahead of impeller for pulverizing. It is hard to predict numerical solution because area of Inlet flow path changes according to the rotation angle of the integrated macerator. So, in this study, the verification of performance evaluation method of Marine vacuum pump were numerically studied by commercial ANSYS CFX 13.0 software. We select a model of performance evaluation for study, and we analyze change of inlet flow path of integrated macerator according to rotation angle. We generate 5 model sets according to rotation angle of the integrated macerator. And we evaluate their performance by numerical analysis. Then, we analyze internal flow field and performance according to rotation angle of the integrated macerator based on numerical analysis result. In addition, we compared with experimental data for validity of numerical result by using steady state analysis.
Numerical study of Double Hydrofoil motions for thrust and propulsive efficiency
Kim, Sue-Jin ; Han, Jun-Hee ; Lee, Do-Hyung ;
The KSFM Journal of Fluid Machinery, volume 17, issue 4, 2014, Pages 59~70
DOI : 10.5293/kfma.2014.17.4.059
The motion of birds and insects have been studied and applied to MAV(Micro Air Vehicle) and AUV(Autonomous Underwater Vehicle). Most of AUV research is focused on shape and motion of single hydrofoil. However, double hydrofoil system is mostly used in real physics. This system shows completely different hydrodynamic characteristic to single hydrofoil because of wake interaction. The goal of this study is define the trajectory of wake interaction in double hydrofoil system. Moreover, trust and efficiency of various combined motion will be demonstrated. Symmetry airfoil is used for analysis an hydrodynamic characteristic. Forward wing's plunging and pitching motion is fixed, hide wing's Heaving ratio, Pitch phase shift from forward plunging and Heaving shift is changed. This study provide necessary basic data of motion optimization for double hydrofoil system.
Dynamic Response Analysis of a Heavy Duty Gas Turbine-Generator with Rigid Coupling Offset
Ha, Jin Woong ; Jung, Dae Seok ;
The KSFM Journal of Fluid Machinery, volume 17, issue 4, 2014, Pages 70~75
DOI : 10.5293/kfma.2014.17.4.070
In this paper a analysis method is presented to obtain the steady state dynamic response from the finite element based equations of a rotor-bearing system with initial deflection. The method has been applied to analyze the dynamic response of the two-shaft rotor-bearing system with rigid coupling offset in a heavy duty gas turbine-generator. Bumps in the dynamic response of each rotor system have been observed at each critical speed due to the effect of initial deflection for rigid coupling offset. And, the dynamic responses have been shown to reduce for operating condition changes from cold to hot.
CFD Analysis on the Flow Characteristics with Flow Coefficient in a PFA Lined Ball Valve for Different Opening Degrees
Jeon, Hong-Pil ; Kim, Dong-Yoel ; Lee, Jong-Chul ;
The KSFM Journal of Fluid Machinery, volume 17, issue 4, 2014, Pages 76~80
DOI : 10.5293/kfma.2014.17.4.076
PFA fluoropolymer lined technology revolutionized ball valve development and design decades ago and continues to be pivotal for many products and valve solutions in diverse industries and applications, such as chemical process, semiconductor/LCD manufacturing processes, pharmaceutical and others. Because of the extreme operating conditions such as high-temperature (
) and high-pressure (~10 bar), the reliability of the valve is very important for minimizing in-line leakage and fugitive emissions of strong corrosive chemicals (hydrochloric acid, hydrofluoric acid, nitric acid, etc.) transported through the lines. In this study, we investigated the flow characteristics with flow coefficient in a PFA lined ball valve for different opening degrees using CFD analyses. The results should be the guidance for a new PFA lined ball valve design that will incorporate all the acclaimed and demonstrated benefits of the current design approaches.