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압밀실험을 이용한 해성점토와 화강풍화토의 압밀특성에 대한 연구
김성헌 ( Seongheon Kim ),김대현 ( Daehyeon Kim ) 조선대학교 공학기술연구원 2015 공학기술논문지 Vol.8 No.3
In this study we have remolded marine clay sample collected along the vertical and horizontal directions and investigated the characteristics of the consolidation constant by Standard Consolidation Test (SCT) and Constant Rate of Strain (CRSC) methods. Also, we have studied the consolidation characteristics and application for weathered granite soil using SCT and CRSC methods for undisturbed and disturbed samples. As a result, values of pre-consolidation stress, compress index, excessive pore pressure and pore water pressure ratio of the marine clay were different due to different test methods(CRS and CRSC) and sampling directions (vertical and horizontal directions). Disturbed and undisturbed samples of the weathered granite soil have showed similar change aspect like marine caly during over-consolidated and normally consolidated stages.
김태성(Taesung Kim),안명근(Myeonggeun Ahn),김성헌(Seongheon Kim),황정재(Jeongjae Hwang),윤영빈(Youngbin Yoon) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.5
본 연구에서는 연소불안정 파악의 기초로 외부 교란이 존재할 때 화염면의 응답 특성에 대해 파악하였다. 향후 이론적 연소불안정 예측과의 비교의 가능성을 열어두기 위해 제트확산화염에서 모델링이 가능한 Burke-Schumann 화염을 모사하였다. 화염면의 응답 특성은 PLIF, PIV 등의 다양한 레이저 기법을 응용하였으며, 이론적 방정식의 결과인 이전 연구에서의 화염면의 응답 특성과 비교하였다. 실험적 결과와 이론적 결과는 다소 차이가 나타났으며, 가장 큰 차이는 화염 길이에서 나타났다. 또한 이론적 결과에서 파악할 수 없는 화염의 절단 및 정체점 등을 확인할 수 있었다. This paper presents experiments showing the flame surface response of a special case of diffusion jet flame to acoustic forcing. This study uses the Burke-Schumann flame because modeling of this flame type can be easily performed. In this paper, many laser diagnostics are used, such as high speed OH PLIF, acetone PLIF and PIV. The result of this paper is compared with the previous researches that are performed by analytical approach. The main difference between experiment and analytical researches is that experimental results shows that flame length decreases with external forcing. Additional differences are flame cutting phenomena and appearance of stagnation point at the flame.
1D Lumped Method를 이용한 모형 부분 예혼합 가스터빈 연소기의 연소불안정 해석
김정진(Jeongjin Kim),윤지수(Jisu Yoon),주성필(Seongpil Joo),김성헌(Seongheon Kim),손채훈(Chae Hoon Sohn),윤영빈(Youngbin Yoon) 한국연소학회 2017 한국연소학회지 Vol.22 No.1
Combustion instability analysis of partially premixed model gas turbine combustor was conducted with 1D lumped method. Flame Transfer Function(FTF) was obtained with variation of fuel composition by Photo Multiplier Tube(PMT) and Hot Wire Anemometry(HWA). Decreasing instability frequency was observed when combustor length increased and multi-mode instability was confirmed. Instability frequency mode was changed while H₂ composition rate was increased and had agreement with experimental value. This work confirms that prediction of longitudinal combustion instability mode of partially premixed combustor is possible using 1D lumped method.