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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
The KSFM Journal of Fluid Machinery
Journal Basic Information
Journal DOI :
Korean Fluid Machinery Association
Editor in Chief :
Volume & Issues
Volume 3, Issue 4 - Dec 2000
Volume 3, Issue 3 - Sep 2000
Volume 3, Issue 2 - Jun 2000
Volume 3, Issue 1 - Mar 2000
Selecting the target year
Study of Reverse Design for an Axial Turbine Blade Profile and Design Parameters for Designing Blade Geometry
Cho, Soo-Yong ; Oh, Koon-Sup ; Choi, Bum-Seog ;
The KSFM Journal of Fluid Machinery, volume 3, issue 2, 2000, Pages 7~14
For a given axial turbine blade, reverse design method is developed to improve blade efficiency, optimize blade profile, or repair parts etc. In this process, design parameters for designing axial turbine blade are induced. The induced design parameters are as follows; ellipse at leading edge, radios of trailing edge, axial chord, tangential chord, wedge angle at the inlet, and unguided turning angle. Suction and pressure surfaces of turbine blade are described by cubic polynomials. Two sample blades we chosen and their blade profiles are measured at the mean radius. Values of design parameters for sample blades are obtained by the reverse design method. Re-designed blade profiles using calculated design parameters are compared with the measured data, and they show good agreement. So, the developed design method could be applied to design general turbine blades. Various blade shapes are designed, and they show that designed blade profiles can be adjusted by controlling design parameters.
An Analysis of the Flow and Sound Field of a Ducted Axial Fan
Jeon, Wan Ho ; Chung, Ki Hoon ; Lee, Duck Joo ;
The KSFM Journal of Fluid Machinery, volume 3, issue 2, 2000, Pages 15~23
The present work describes the prediction method for the unsteady flow field and the acoustic pressure field of a ducted axial fan. The prediction method is comprised of time-marching free-wake method, acoustic analogy, and the Kirchhoff-Helmholtz BEM. The predicted sound signal of a rotor is similar to the experiment one. We assume that the rotor rotates with a constant angular velocity and the flow field around the rotor is incompressible and inviscid. Then, a time-marching free-wake method is used to model the fan and to calculate the flow field. The force of each element on the blade is calculated by the unsteady Bernoulli equation. Lowson's method is used to predict the acoustic source. The newly developed Helmholtz-Kirchhoff BEM lot thin body is used to calculate tile sound field of the ducted fan. The ducted fan with 6 blades is analysed and the sound field around the duct is calculated.
Flow and Heat Transfer Analysis of a Reactor Coolant Pump in Transient Conditions
Hur, N. ; Kim, S. ; Yoo, K.-P. ; Kim, S. T. ;
The KSFM Journal of Fluid Machinery, volume 3, issue 2, 2000, Pages 24~30
The structural analysis of a reactor coolant pump(RCP) of a nuclear power plant is very important for the safety assessment of the plant. Accurate boundary conditions for the heat transfer coefficient are required for reliable thermal stress analysis of the pump casing, especially in transient operations of the pump since the coolant properties are largely dependent on operational conditions. In the present study, a 3D mixed flow type coolant pump was modeled from the RCP drawings and analyzed in the steady state and number of transient flow conditions by using a commercial code STAR-CD. From the result of the computation, it is seen that the average heat transfer coefficients for the cases considered are found to be the suggested values of the manufacturer, Westinghouse Energy System. The unevenness in local heat transfer coefficients, however, is found to be considerable so that the use of average heat transfer coefficients in all boundaries might not give reliable thermal stress predictions.
A Numerical Study on the Effect of Blade Shapes on the Performance of the Propeller-type Submersible Mixers
Choi, Y. S. ; Lee, J. H. ; Kim, S. I. ;
The KSFM Journal of Fluid Machinery, volume 3, issue 2, 2000, Pages 31~35
In this research, the performance predictions of the submersible mixer were investigated. The variation of the performance characteristics by changing the impeller design parameters were discussed through the flow calculation results by using a commercial program, FLUENT. The performance of the submersible mixers is related to the velocity diffusion profiles downstream of the impeller and also the required input motor power to mix the fluid. In this study, the various design parameters such as the number of blade, the hub and tip diameters, the impeller blade profiles and revolution speed of the blades were taken for the fixed values. The blade sweep direction, the chord length distribution along with the radius of the blade and the inlet blade angle were changed to make different testing models. The flow calculation results show the effect of the changed design parameters on the performance of the submersible mixers and also give some helpful information for designing more efficient submersible mixers.
Compressor Performance with Variation of Diffuser Vane Angle
Shin, Y. H. ; Kim, K. H. ; Bae, M. H, ; Kim, J. H. ;
The KSFM Journal of Fluid Machinery, volume 3, issue 2, 2000, Pages 36~43
This study presents the centrifugal compressor performance for three different vane stagger angles and wall pressure distribution within vaned diffuser channels, and is also discussed about the stability with respect to the compressor components. As the vane stagger angle decreases, the flow rate for the stall onset decreases, and higher pressure can be obtained at the low flow rate region, however, the effective operation range of the compressor decreases because of the blockage effect of the diffuser vane. Low pressure pocket within the vaned diffuser channel moves from the pressure side of leading edge to the suction side as the flow rate decreases. The compressor system stability mainly depends on that of the diffuser.
An Experimental Study on the Discharge Coefficients of Small Sonic Nozzles
Cha, Tsi-Sun ; Park, Kyung-Am ; Choi, Yong-Moon ; Choi, Hae-Man ; Yoon, Bok-Hyun ;
The KSFM Journal of Fluid Machinery, volume 3, issue 2, 2000, Pages 44~49
Small sonic nozzles (throat diameter
) were tested in the gas flow standard system. This standard system is composed of two bell provers and 5 column piston provers, compressor, filters, and dehumidifier. The discharge coefficients of small some nozzles are obtained and correlated as a function of throat Reynolds numbers with
uncertainty at a confidence level
. The tested high Reynolds number was the lower limit of ISO 9300 specifications. The data are useful as data base for revision of ISO 9300.
Effects of Lobe Shapes on the Performance of Roots-Type Vacuum Pump
Kim, H.-J. ; Kim, Youn J. ; Hwang, Y.-K. ;
The KSFM Journal of Fluid Machinery, volume 3, issue 2, 2000, Pages 50~56
The effects of lobe shapes on the leak flow conductance of Roots-type vacuum pump are studied numerically and experimentally. The modelled lobe shape of Roots-type vacuum pump is two-lobe spur gear. The numerical analyses are performed on leak flows in Roots-type vacuum pump. It is numerically calculated using a 4th-order Runge-Kutta method and is compared with experimental results. Results show that for the case of involute lobe shape the total amount of the leak flow conductance is greater than that of cycloid and Cassini oval lobe shapes.
Unsteady Pressure Distributions in a Channel Diffuser of Centrifugal Compressor
Kang, Jeong-Seek ; Cho, Sung-Kook ; Kang, Shin-Hyoung ;
The KSFM Journal of Fluid Machinery, volume 3, issue 2, 2000, Pages 57~65
The aim of this paper is to understand the unsteady flow phenomena in a high speed centrifugal compressor channel diffuser. Instantaneous pressures aye measured at six locations in the diffuser using fast-response pressure transducers. Instantaneous pressure ratio decomposition was applied to analyze the pressure signal. In vaneless space where impeller-vaned diffuser interaction is strong, aperiodic unsteadiness is high and periodic pressure waveforms by blade passing are not clear at low flow rates, especially near vane suction side. High aperiodic unsteadiness decreases downstream of diffuser. The blade-to-blade pressure wave does not disappear in surge flow condition. In surge there exist not only large scale periodic surge wave but also blade-to-blade pressure wave.
압축기의 소음레벨 측정방법 KS B 6361의 개정 해설
The KSFM Journal of Fluid Machinery, volume 3, issue 2, 2000, Pages 66~77
유량 측정 표준 현황
The KSFM Journal of Fluid Machinery, volume 3, issue 2, 2000, Pages 78~82
국내 밸브 시장 현황
The KSFM Journal of Fluid Machinery, volume 3, issue 2, 2000, Pages 83~85
국내 유량계 개발 현황
The KSFM Journal of Fluid Machinery, volume 3, issue 2, 2000, Pages 86~89
국내 유량 측정 기술 현황 및 전망
The KSFM Journal of Fluid Machinery, volume 3, issue 2, 2000, Pages 90~93
국내 천연가스 유량계 운영 현황
The KSFM Journal of Fluid Machinery, volume 3, issue 2, 2000, Pages 94~98