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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The KSFM Journal of Fluid Machinery
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Journal DOI :
Korean Fluid Machinery Association
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Volume & Issues
Volume 18, Issue 6 - Dec 2015
Volume 18, Issue 5 - Oct 2015
Volume 18, Issue 4 - Aug 2015
Volume 18, Issue 3 - Jun 2015
Volume 18, Issue 2 - Apr 2015
Volume 18, Issue 1 - Feb 2015
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Measurement of Ceiling Temperature in Tunnel for Heights and Fire Sizes of Fire Source
Park, Won-Hee ;
The KSFM Journal of Fluid Machinery, volume 18, issue 1, 2015, Pages 5~10
DOI : 10.5293/kfma.2015.18.1.005
The "Ondong tunnel" is not used now where is one of the tunnels in the Janghang line which is from Cheonan to Iksan. The length of the tunnel is 214 m. The location of the fire source is center of the tunnel and the pool fire with heptane is for the fire source. Tests are carried out for the various fire sizes, the height and obstructed/open condition of the fire source. Temperature on the top of the tunnel is measured. Even if the fire size is same, the maximum temperature on the ceiling of the tunnel for the elevated fire source is very larger than the maximum for the ground fire source. As the fire size is lager the maximum temperature on the ceiling is higher. These test results can be very useful for design and guidelines of fire detectors in tunnels.
Effect of Air Layer on the Performance of an Open Ducted Cross Flow Turbine
Wei, Qingsheng ; Chen, Zhenmu ; Singh, Patrick Mark ; Choi, Young-Do ;
The KSFM Journal of Fluid Machinery, volume 18, issue 1, 2015, Pages 11~19
DOI : 10.5293/kfma.2015.18.1.011
Recently, the cross flow turbines attract more attention for their good performance over a large operating regime at off design point. This study employs a very low head cross flow turbine, which has open inlet duct and has barely been studied before, to investigate the performance of the cross flow turbine with air suction from the rear part of the runner. Unlike conventional cross flow turbines, a draft tube is attached to the outlet of runner to improve the turbine performance. Water level and pressure in the draft tube are monitored to investigate the influence of air suction. Torque at local blade passage of three parts of runner is examined in detail under the conditions of different air suction. Consequently, it is found that with proper air suction in the runner chamber, the water level in the draft tube gradually drops to Stage 2 of the runner and the efficiency of the turbine can be raised by 10%. Overall, the effect of air-layer on the performance of the turbine is considerable.
Design of a Pump-Turbine Based on the 3D Inverse Design Method
Chen, Chengcheng ; Zhu, Baoshan ; Singh, Patrick Mark ; Choi, Young-Do ;
The KSFM Journal of Fluid Machinery, volume 18, issue 1, 2015, Pages 20~28
DOI : 10.5293/kfma.2015.18.1.020
The pump-turbine impeller is the key component of pumped storage power plant. Current design methods of pump-turbine impeller are private and protected from public viewing. Generally, the design proceeds in two steps: the initial hydraulic design and optimization design to achieve a balanced performance between pump mode and turbine mode. In this study, the 3D inverse design method is used for the initial hydraulic impeller design. However, due to the special demand of high performance in both pump and reverse mode, the design method is insufficient. This study is carried out by modifying the geometrical parameters of the blade which have great influence and need special consideration in obtaining the high performance on the both modes, such as blade shape type at low pressure side (inlet of pump mode, outlet of turbine mode) and the blade lean at blade high pressure side (outlet of pump mode, inlet of turbine mode). The influence of the geometrical parameters on the performance characteristic is evaluated by CFD analysis which presents the efficiency and internal flow results. After these investigations of the geometrical parameters, the criteria of designing pump-turbine impeller blade low and high sides shape is achieved.
Mechanical Load Performance Measurements of a Low Temperature Differential Stirling Engine with Water-Sprayed Heat Transfer according to Supply Water Flow Rates and Temperatures
Sim, Kyuho ; Jeong, Min-Seong ; Lee, Yoon-Pyo ; Jang, Seon-Jun ;
The KSFM Journal of Fluid Machinery, volume 18, issue 1, 2015, Pages 29~36
DOI : 10.5293/kfma.2015.18.1.029
Recently, Stirling engines are emerging as a key device for power conversion of renewable energy or waste energy. This study develops a LTDSE(Low Temperature Differential Stirling Engine) using a water spray for higher heat transfer and performs load performance tests for various flow rates and temperatures of hot water spray for variable engine loads emulated by a mechanical friction device. Internal temperature and pressure, working frequency and inlet and outlet temperature of the supply water are measured. As a result, the increases in flow rate and temperature of hot water respectively enhance the power output, efficiency and the working frequency, while the increasing engine load leads to decreases in working frequency but increases in the pressure amplitude. Eventually, it is revealed there exists a maximum shaft power of the test engine.
Performance Measurements of A Stirling Engine for Household Micro Combined Heat and Power with Heat Source Temperatures and Cooling Flow Rates
Sim, Kyuho ; Kim, Mingi ; Lee, Yoon-Pyo ; Jang, Seon-Jun ;
The KSFM Journal of Fluid Machinery, volume 18, issue 1, 2015, Pages 37~43
DOI : 10.5293/kfma.2015.18.1.037
A Beta-type Stirling engine is developed and tested on the operation stability and cycle performance. The flow rate for cooling water ranges from 300 to 1500 ml/min, while the temperature of heat source changes from 300 to
. The internal pressure, working temperatures, and operation speed are measured and the engine performance is estimated from them. In the experiment, the rise in the temperature of heat source reduces internal pressure but increases operation speed, and overall, enhances the power output. The faster coolant flow rate contributes to the high temperature limit for stable operation, the cycle efficiency due to the alleviated thermal expansion of power piston, and the heat input to the engine, respectively. The experimental Stirling engine showed the maximum power output of 12.1 W and the cycle efficiency of 3.0 % when the cooling flow is 900 ml/min and the heat source temperature is
Rotordynamic Analysis of See-through-type Labyrinth Seal Using 3D CFD
Ha, Tae Woong ;
The KSFM Journal of Fluid Machinery, volume 18, issue 1, 2015, Pages 44~50
DOI : 10.5293/kfma.2015.18.1.044
Labyrinth seals are commonly used in various kinds of turbomachinery to reduce leakage flow. In the present 3D CFD analysis of see-through-type labyrinth air seal, the methodology of determining leakage and rotordynamic coefficients is suggested with the relative coordinate system for steady-state simulation. The leakage flow and rotordynamic forces predicted by using different solvers and turbulent models of FLUENT are compared with the results of the existing bulk-flow analysis code LABYSEAL.FOR and experiment. The present CFD result of direct stiffness(K) shows only improvement in prediction. The results of leakage and rotordynamic coefficients as well as computing time are sensitive against the used solver and turbulent model.
A Comparison of Performance of Six and Twelve-Blade Vane Tidal Turbines between Single and Double Blade-row Types
Nguyen, M.H. ; Kim, J.H. ; Kim, B.K. ; Yang, C. ;
The KSFM Journal of Fluid Machinery, volume 18, issue 1, 2015, Pages 51~58
DOI : 10.5293/kfma.2015.18.1.051
This paper presents a study on Vane Tidal Turbine (VTT) focusing on analysis of two types of blade arrangement originated from the previous studies where the original design was examined and performance-tested for different numbers of blades (six, eight and twelve). Compared to conventional tidal turbines, VTT has several special features and potential advantages which have been being thoroughly developed. The purpose of this study is to analyze VTT's capability of extracting and converting the hydrokinetic energy of tidal currents into electricity at given arrangement of blades (single and double rows, six and twelve blades) using CFD. From the calculation results, the six-blade single row turbine shows the best performance, in which the highest power and torque coefficients reach up to about 34 % and 36 %, respectively, at TSR=0.94. However, despite of lower power coefficient, by adding more blades, the torque's extraction of twelve-blade turbine, especially the double row type, is less fluctuate than that of the six-blade setups.
An Investigation on Step Responses of Pitch PI Controller for a 2MW Wind Turbine Using Bladed S/W
Lim, Chae Wook ;
The KSFM Journal of Fluid Machinery, volume 18, issue 1, 2015, Pages 59~64
DOI : 10.5293/kfma.2015.18.1.059
The pitch control system in wind turbines becomes more and more important as the wind turbines are larger in multi-MW size. PI controller has been applied in most pitch controllers and it has been known that gain-scheduling is essential for pitch control of wind turbines. A demo model of 2 MW wind turbine which represents the whole dynamics of wind turbine including dynamic behaviors of blade, tower and rotational shaft is given in the commercial Bladed S/W for real wind turbines. In this paper, some results on step responses of the pitch PI controller and effectiveness of gain-scheduled pitch PI controller are presented through the Bladed S/W for the 2 MW wind turbine.
Cavitating Flow Analysis of Multistage Centrifugal Pump
Rakibuzzaman, Rakibuzzaman ; Suh, Sang-Ho ; Kim, Hyoung-Ho ; Cho, Min-Tae ; Shin, Byeong-Rog ;
The KSFM Journal of Fluid Machinery, volume 18, issue 1, 2015, Pages 65~71
DOI : 10.5293/kfma.2015.18.1.065
The purpose of this study is to investigate cavitating flow of the multistage centrifugal pump. Cavitation is observed in the impeller leading edge and trailing edge of the suction area. Head coefficients are measured under different flow operating conditions. The Rayleigh-Plesset cavitation model is adapted to predict the occurrence of cavitation in the pump. The two-phase gas-liquid homogeneous CFD method is used to analyze the centrifugal pump performances with two equation transport turbulence model. The simulations are carried out with three different flow coefficients such as 0.103, 0.128 and 0.154. The occurrence of cavitation described according to water vapor volume fraction. The head versus NPSH (Net Positive Suction Head) also measured using different flow coefficients. Development of cavitation in the centrifugal pump impellerI is discussed. It is showed that the simulation represents the head drop about 3%.