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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.
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유승엽(Seungyeob Ryu),박천태(Cheontae Park),한승열(Seungyeul Han),고성호(Sungho Ko) 한국유체기계학회 2009 유체기계 연구개발 발표회 논문집 Vol.2009 No.-
Free energy based lattice Boltzmann method (LBM) has been used to simulate the rising bubble flows with large density ratio. LBM reduce the spurious current of the static bubble test and satisfy with the Laplace law. The terminal rise velocity and shape of the bubbles are dependent on Eotvos number, Morton number and Reynolds number. For single bubble flows, simulations are executed for various Eotvos number, Morton number and Reynolds number, and the results are agreed well with the experiments. For multiple bubbles, the bubble flow characteristics are related by the vortex pattern of the leading bubble. The coalescence of the bubbles are simulated successfully and the subsequent results are presented.