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비정상 흐름-파랑 공존장의 인공어초 침하특성에 관한 연구
윤상준(SANG-JOON YOON),김헌태(HEON-TAE KIM) 한국해양공학회 2001 韓國海洋工學會誌 Vol.15 No.3
The experimental studies for the artificial reef (AFR) subsidence characteristics in the unsteady flow field and in the unsteady flow-wave field were carried out. The difference of scour/subsidence characteristics between in the steady flow field and in the unsteady flow field was discussed and also the long-term subsidence characteristics in the unsteady flow field were investigated. AFR subsidence characteristics was discussed with Keulegan-Carpenter number (KC), Reynolds number (Re*), Shields number (Sn*) and dimensionless time (t/Tt). And the difference of subsidence characteristics between in the unsteady flow field and in the unsteady flow-wave field W1S discussed.
윤상준 ( Sang Jun Yoon ),김용구 ( Young Ku Kim ),전창준 ( Chang Joon Jeon ),이재구 ( Jae Goo Lee ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.5
Although biomass syngas is very low calorific gas, it is utilized by means of dual fuel combustion technology in the fields of industrial furnace and boiler as a substitute oil technology. The basic structure of duel fuel combustion burner is designed so that low caloric gas fuel is supplied around an oil burner in the middle. In the present study, three types of mixing burners were manufactured to conduct performance experiment. Low caloric gas was evenly distributed around the oil burner and the method of changing the angle of gas nozzle was applied. CO generation decreased according to the increase of the amount of air for combustion. In addition, the shapes and colors of flame changed according to the proportions of gas and oil used. Remained flame after combustion was from the lack of atomization at the exit of oil burner. Although it was difficult to maintain the optimum air ratio due to different required air ratio for oil and syngas, stable combustion was able to maintained within excess oxygen concentration of 4.7~8.2%. From this study, it was shown that the oil atomization at the exit of fuel oil nozzle was promoted by the increased rate of syngas combustion and the CO concentration in flue gas lower than only fuel oil combustion.
수직이착륙기의 착륙접근시 단일엔진고장 및 비행전이 영역 해석
윤상준(Sang-Joon Yoon),안병호(Byung-Ho Ahn),최동훈(Dong-Hoon Choi),Dimitri Mavris 한국항공우주학회 2005 韓國航空宇宙學會誌 Vol.33 No.5
본 연구에서는 착륙 접근시 단일엔진 고장 분석 및 비행전이 해석을 통하여 수직이착륙기에서 요구하는 최적의 엔진추력과 날개하중비를 구하고자 한다. 항공기 해석 모듈들은 기존의 항공기 통합 사이징 프로그램을 기반으로 하고 있으며, 항공기 설계 및 해석을 하나로 묶는 컴퓨팅 체계 구축은 사용자 용도에 맞게 주문 제작이 용이한 반 완성 프로그램인 EMDIOS를 설계프레임웍으로 사용하였다. 시뮬레이션 결과, 고도 40 ft 근처가 단일엔진고장시 가장 위험한 영역임을 확인할 수 있었으며, 비행전이 영역에 대한 파라메타 연구를 통하여 엔진 추력은 클수록, 반면에 엔진틸트각 회전속도와 날개 하중비는 작을수록 비행전이시의 고도 상실이 작아짐을 알 수 있었다. The objective of this study is to find the optimal thrust condition and wing loading of a vertical take-off and landing (VTOL) fixed-wing aircraft through a single engine failure analysis during landing approach and an analysis of transition flight. The aircraft analysis modules used in the study are based on the aircraft synthesis program. To achieve the computing infrastructure for aircraft design and analysis, the EMDIOS was employed as a design framework, which is a semi-completed application program and ready to customize. Simulation results reveal the most critical height at the event of single engine failure is approximately 40 ft. And, in order to avoid a significant loss in altitude during the transition, the thrust to weight ratio must be kept high, while both the engine tilt speed and the wing loading must be kept low, as confirmed by the analysis results.