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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 1, Issue 1 - Sep 1998
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Interactive System of Computational Grid Generation for Aerodynamic Design of Axial Flow Compressors
Chung, Hee-Taeg ;
The KSFM Journal of Fluid Machinery, volume 1, issue 1, 1998, Pages 7~16
An interactive mode of grid generation system has been developed for a Navier-Stokes design procedure of axial flow compressors. The present grid generator adopts the multiblock H-grid structure, which simplifies the creation of computational grids about complex turbomachinery geometries and facilitate the manipulation of multiple grid blocks for multirow flow fields. The numerical algorithm adopts the combination of the algebraic and elliptic method to create the internal grids efficiently and quickly. The system consists of four separated modules, which are linked together with a common graphical user interface. The system input is made of the results of the preliminary design. The final grids generated from each module of the system are used as the preprocessor for the performance prediction of the two-or three-dimensional flow simulation inside the blade passage. Application to the blade design of the LP compressor was demonstrated to be very reliable and practical in support of design activities. This customized system are coupled strongly with the design procedure of the turbomachinery cascades using the Navier-Stokes technique.
Dynamics Analysis for Preventing Failures of Steam Turbine Blade
Kim, Hyo-Jin ; Park, Jung-Yong ;
The KSFM Journal of Fluid Machinery, volume 1, issue 1, 1998, Pages 17~23
The blade failures are identified as the leading cause of unplanned outages for steam turbine. Most investigations of the failures are limited to material tests, chemical analysis of deposits, and possibly examination of material specimens. But to correct a blading problem requires more than positive identification of the mechanisms involved. An analytic procedure capable of predicting stress and dynamic characteristics of turbine blades is presented to increase steam turbine availability by decreasing blade failures. Finite element method is used to model and predict natural frequencies, steady and dynamic stresses of turbine blades. The procedure is illustrated by the case study. This procedure is used to guide, and support the plant manager's decision to avoid a costly, unplanned outage
Performance of NACA 65-810 Radial Airfoil Impellers
Kang, Shin-Hyoung ; Hu, Shengli ;
The KSFM Journal of Fluid Machinery, volume 1, issue 1, 1998, Pages 24~31
Aerodynamic performance tests and flow measurement were carried out for several radial impellers of NACA 65-810 airfoil. The data base obtained are to be used for verifying the methods of flow analysis and CFD codes. The effects of numbers and span of blades on the performances, efficiency and impeller exit flow are investigated in the present study. The flow rate on the performance curve is proportional to the span of the blade for the same value of fan pressure rise. The magnitude of radial velocity component at the impeller exit gradually decreases from the hub to shroud side. The magnitude of tangential velocity component gradually increases from the hub to shroud side. The way of variations of velocity is the same at the diffuser exit, however, becomes more uniform. The pressure rise performance increases with blade number at the small flow coefficients, however, decreases with the number of blade at the large flow coefficients. This shows that flow guidance in important at the low flow rate and the friction becomes significant at the high flow rate.
Aerodynamic Performance Enhancement and Noise of Cooling Fans for Driving Motor
Kang, Shin-Hyoung ; Park, Tae-Choon ; Cho, Nam-Hyo ;
The KSFM Journal of Fluid Machinery, volume 1, issue 1, 1998, Pages 32~40
Aerodynamic performance of a cooling fan of driving motor was enhanced modifying the vane-shroud configuration. Performance of a target model was evaluated to obtain baseline data. The aerodynamic performance and sound pressure level were tested and measured with different numbers of vane of increased length. The tested models show high and stable performance and low values of specific noise level. The long vane-shroud structure induces more stable through flow and decreases the tip leakage flow, which contributes to the increases of performance and efficiency. The sound pressure level increases for the modified model, however, specific noise level decreases.
Experimental Study on the Design Parameter Effects on the Flow-rate and the Noise level in a Cross-flow Fan
Ahn, Cheol-O ; Rew, Ho-Seon ;
The KSFM Journal of Fluid Machinery, volume 1, issue 1, 1998, Pages 41~48
This study was carried out to investigate the effect of design parameters on the volume flow-rate and the noise level and to finally find the optimal design variables. Eighteen cross-flow fans were designed by the method of orthogonal array, and the flow-rate and the noise level were measured. These data were analyzed by the neural network system. The effects of eight design variables(scroll exit angle, scroll arc length et al.) on the fan performance and the noise level were valuated and discussed. This experiment shows that the design solutions suggested by neural network system may increase its volume flow-rate and reduce noise simultaneously.
An Experimental Study on the Effects of Non-uniform Inlet Flows upon Tonal Radiation from an Axial-type Propeller Fan
Lee, Seungbae ; Kim, Kwang-Yong ; Yang, Gwi-Chul ;
The KSFM Journal of Fluid Machinery, volume 1, issue 1, 1998, Pages 49~57
The acoustic signatures from a propeller fan under non-uniform inlet flow conditions were measured to reveal the mechanism for tonal radiation. Experimental studies were carried out by generating non-uniform turbulent flows with circumferential and radial components of harmonic incoming gust deliberately. This paper reports the measured acoustic power exponents and cross-spectra for circumferential and radial disturbances at a specified flow-rate coefficient.
Development of a Rotating Turbine Test Rig
Park, Eung-Sik ; Song, Seung-Jin ; Hong, Yong-Shik ;
The KSFM Journal of Fluid Machinery, volume 1, issue 1, 1998, Pages 58~63
To investigate turbine flow fields under realistic conditions, a rotating turbine test facility has been developed at the Inha University Propulsion Laboratory. The experimental facility consists of an air inlet, settling chamber, single turbine stage test section, and diffuser. This turbine has a design flow coefficient of 0.55 and work coefficient of 1.88. The turbine test rig has four features. First, a large scale test section improves space resolution. Second, low speed rpm enhances safety and reduces required power, Third, DC motor/generator is able to regenerate blower power. Fourth, various types of experiment can be carried out.
Numerical Study on Flow Field in Centrifugal Fan Volute
Kim, Se-Jin ; Joo, Won-Gu ;
The KSFM Journal of Fluid Machinery, volume 1, issue 1, 1998, Pages 64~71
The non-uniform pressure generated in the volute generally are propagating upstream. As a result, outlet conditions of rotaing impeller are changed and the performance degrades. The major object of this research is to develop the numerical method which can calculate the effects of impeller and volute flow field interactions. Under the assumption of steady three-dimensional incompressible turbulent flow, the time averaged N-S equations involving
turbulent model was solved by the F.V.M. To verify the computational method, the calculations are compared with experimental results published in literature and show satisfactory agreement with them, The three-dimensional flow characteristics within the volute of a centrifugal fan at design and off-design operating points have also been studied.
Numerical Prediction of Incompressible Flows Using a Multi-Block Finite Volume Method on a Parellel Computer
Kang, Dong-Jin ; Sohn, Jeong-Lak ;
The KSFM Journal of Fluid Machinery, volume 1, issue 1, 1998, Pages 72~80
Computational analysis of incompressible flows by numerically solving Navier-Stokes equations using multi-block finite volume method is conducted on a parallel computing system. Numerical algorithms adopted in this study
QUICK upwinding scheme for convective
central differencing for other terms
the second-order Euler differencing for time-marching procedure. Structured grids are used on the body-fitted coordinate with multi-block concept which uses overlaid grids on the block-interfacing boundaries. Computational code is parallelized on the MPI environment. Numerical accuracy of the computational method is verified by solving a benchmark test case of the flow inside two-dimensional rectangular cavity. Computation in the axial compressor cascade is conducted by using 4 PE's md, as results, no numerical instabilities are observed and it is expected that the present computational method can be applied to the turbomachinery flow problems without major difficulties.
Effects of the Impeller Shapes on the Non-Clogging and the Screw-type Centrifugal Pump Performances
Kim, Dong-Joo ; Suh, Sang-Ho ; Sung, Sun-Kyung ;
The KSFM Journal of Fluid Machinery, volume 1, issue 1, 1998, Pages 81~89
In this study, the effects of the impeller shapes on the pump performances of the non-clogging and the screw-type centrifugal pumps are experimentally studied. The characteristics of total head, efficiency and power of the non-clogging pump increase as the number of vanes increases. The screw-type centrifugal pump with the linear-shape vane shows a little better performance than that of the screw-type centrifugal pump with the curved-shape vane. The differences in the characteristics of total head, efficiency and power are, however, insignificant. Therefore, it is advisable that, considering the convenience of pump manufacturing, the screw-type centrifugal pump with the linear-shape vane should be used. This study also compares the pump characteristics of the non-clogging pump and screw-type centrifugal pump. The characteristics of total head and efficiency of the non-clogging pump are better than those of the screw-type centrifugal pump. The screw-type centrifugal pump requires more shaft power than the non-clogging pump.
How to Study on Automotive Torque Converter
Park, Jae-In ; Cho, Kang-Rae ;
The KSFM Journal of Fluid Machinery, volume 1, issue 1, 1998, Pages 90~104
The automotive torque converter is a complex turbomachine used to transfer power smoothly from an engine to a transmission. Its hydrodynamic design technology has been advanced very much during the past few years. A review of technologies for developing the torque converter was presented. In this paper, the technologies in the torque converter were divided into four parts: one-dimensional analysis, experimental study, numerical study, and new design method of the torque converter. In order to provide useful guidances to the torque converter designer, numerous papers published previously were incited and summarized briefly in this paper.
공조용 유체기계 기술 및 제품동향
The KSFM Journal of Fluid Machinery, volume 1, issue 1, 1998, Pages 105~105
공조용 로터리 압축기
The KSFM Journal of Fluid Machinery, volume 1, issue 1, 1998, Pages 106~112
The KSFM Journal of Fluid Machinery, volume 1, issue 1, 1998, Pages 113~120
공조용 스크롤 압축기
The KSFM Journal of Fluid Machinery, volume 1, issue 1, 1998, Pages 121~128