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PIV에 의한 펌프장 흡입수조의 자유표면에서 발생하는 와의 유동특성에 관한 연구
최종웅(J. W. Choi),김범석(B. S. Kim),이현(H. Lee),김유택(Y. T. Kim),이영호(Y. H. Lee) 한국유체기계학회 2002 유체기계 연구개발 발표회 논문집 Vol.- No.-
The head-capacity curves for pumps developed by the pump manufacturer are based on tests of a single pump operating in a semi-infinite pool with no nearby walls or floors and no stray currents. Hence, flow into the pump suction is symmetrical with no vortices or swirling. Pump station designers rely on these curves to define the operating conditions for the pump selected. But various constraints such as size, cost, and limitations on storage time require walls, floors, and pump intakes to be close proximity to each other. From this background, the authors are carrying out a systematic study on the flow characteristics of intakes within a sump found within a sump of pump stations. Model pump intake basin is designed and PIV is adopted as a measuring tool to capture the instantaneous flow patterns. Special attention is paid to investigate the flow patterns near the free surface due to different clearances from back-wall to vertical intake pipe with bell mouse and without. Moreover, the locations and vorticities of the various types of vortices that were found in the examinations are discussed.
ALE 모델의 래티스볼츠만 스킴에의 적용 : 회전하는 타원체로부터 유기되는 유동소음 해석
최종웅(J.W Choi),강호근(H.K. Kang),안수환(S.W. Ahn),김정환(J.W. Kim) 한국항해항만학회 2008 한국항해항만학회 학술대회논문집 Vol.2008 No.공동학술
Numerical solutions are presented for compressible fluid flow past a rotating elliptic cylinder in a medium at rest at infinity. Flowfields and acoustic waves emitted from rotating elliptic cylinder are directly simulated by the lattice Boltzmann method formulated by the arbitrary Lagrangian Eulerian scheme. The flowfield is almost periodic after the calculation fully developed and studied by means of streamlines and equi-vorticity lines and by means of drag, lift and moment coefficients. The numerical analysis produce typical flows such that the large vortexes appear at the outside of the elliptic cylinder, and move slowly to the same direction as the cylinder's rotation. The positive and negative vorticity is alternately occurred at the edge by those large vortexes. The acoustic waves propagate synchronizing with the rotation and increase with M3.5 of rotational speed of elliptic cylinder.
최종웅(J.W Choi),강호근(H.K. Kang),안수환(S. W. Ahn),김정환(J.W. Kim) 한국마린엔지니어링학회 2008 한국마린엔지니어링학회 학술대회 논문집 Vol.2008 No.-
Numerical solutions are presented for compressible fluid flow past a rotating elliptic cylinder in a medium at rest at infinity. Flowfields and acoustic waves emitted from rotating elliptic cylinder are directly simulated by the lattice Boltzmann method formulated by the arbitrary Lagrangian Eulerian scheme. The flowfield is almost periodic after the calculation fully developed and studied by means of streamlines and equi-vorticity lines and by means of drag, lift and moment coefficients. The numerical analysis produce typical flows such that the large vortexes appear at the outside of the elliptic cylinder, and move slowly to the same direction as the cylinder's rotation. The positive and negative vorticity is alternately occurred at the edge by those large vortexes. The acoustic waves propagate synchronizing with the rotation and increase with M<SUP>3.5</SUP> of rotational speed of elliptic cylinder.