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곽영균(Youngkyun Kwack),고성호(Sungho Ko),정재구(Jaekoo Jung),조남빈(Nambin Cho),윤이수(Leesoo Yoon) 한국유체기계학회 2007 유체기계 연구개발 발표회 논문집 Vol.- No.-
A stability analysis has been made for a newly designed gate of intake tower of reservoir. The analysis is composed of finding the natural frequency of the gate and the frequency induced by water flowing over and through the gate. ANSYS is employed to calculate the natural frequency of the gate and SC/Tetra is utilized for calculating flow field around the gate, which in turn gives the frequency of pressure force fluctuation on the gate. In addition to the safety analysis, the present study presents how the gate selectively intakes a muddy water layer located in the middle depth of reservoir.
고성호(Sungho Ko),곽영균(Youngkyun Kwack),한승열(Seungyeul Han) 한국유체기계학회 2009 유체기계 연구개발 발표회 논문집 Vol.2009 No.-
Numerical studies were performed to analyze effect of nozzle number on supersonic jet noise. When the nozzle of antitank guided missile(ATGM) exhausts a plume, the supersonic blast wave is created and makes a complicated flux and supersonic jet noise. The method of similarity modelling is used to analyze the supersonic jet noise of multiple nozzle jets as well as a single nozzle jet. Numerical results show that the sound pressure level of multiple nozzle jet is lower than that of a single nozzle jet.
고성호(Sungho Ko),곽영균(Youngkyun Kwack),한승열(Seungyeul Han),김연태(Yeantae Kim) 한국유체기계학회 2009 유체기계 연구개발 발표회 논문집 Vol.2009 No.-
The present study describes the effects of IGV(inlet guide vane) on the internal flow of the rotor blades of a transonic axial compressor. Numerical solutions of the governing RANS equations for the three dimensional turbulent flows inside the compressor have been obtained by utilizing the ANSYS CFX program. The assessment of the IGV performance has been made by analyzing the numerical solutions of compressor and flow characteristics such as isentropic efficiency, total pressure, static pressure, incidence angle, and Mach number.
고성호(SungHo Ko),곽영균(YoungKyun Kwack),이상현(SangHyun Lee),장용수(YongSu Jang) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
In this study, flow characteristics has been investigated by changing the impeller design parameter of submersible mixer. A commercial program, SC-Tetra was used to analyze the flow characteristic of submersible mixer. The performance of the submersible mixer is related to the velocity diffusion profiles of the impeller and required input motor power to mix the fluid. The relation of the design parameter and performance of submersible mixer has been studied by comparing each flow analysis resolution of various design parameters such as the blade diameter, inlet angle, revolution speed. The influence of design parameter on submersible mixer has been investigated through the flow analysis for the various models because to the difference of the sweep direction of blades, chord length, and inlet blade angle. This study is helpful to design more effective submersible mixer.
고성호(Sungho Ko),곽영균(Youngkyun Kwack),이상현(Sanghyun Lee),정태희(Taehee Jung),황경서(Kyungseo Hwang) 한국유체기계학회 2008 유체기계 연구개발 발표회 논문집 Vol.2008 No.-
A numerical analysis for silencers of the multi hole orifice valve has been performed. The Reynolds-Averaged Navier-Stokes equations with K-ε turbulence model were employed to compute steady. incompressible flow, an symmetric computational domain. and unstructured grids. The resolution of flow field is observed by pressure distribution, flow streamline, valve flow coefficient and valve loss coefficient. The valve flow coefficient reduce approximately 9% but valve loss coefficient increse approximately 16%.