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유재훈,안해성,Yoo Jae-Hoon,Ahn Hae-Seong 한국마린엔지니어링학회 2006 한국마린엔지니어링학회지 Vol.30 No.1
It is important to understand flow characteristics and performances of sails for both sailors and designers who want to have efficient thrust of yacht In this Paper the viscous flows around sail-like rigid wings, which are similar to main and jib sails of a 30 feet sloop, are calculated using a CFD tool. Lift, drag and thrust forces are estimated for various conditions of gap distance between the two sails and the center of effort of the sail system is obtained. Wind tunnel experiments are also carried out to measure aerodynamic forces acting on the sails system and to validate the computation. It is found that the combination of two sails produces the lift force larger than the sum of that produced separately by each sail and the gap distance between the two sails is an important factor to determine total lift and thrust.
예인수조 시험 및 VPP 계산에 의한 세일링 요트의 성능 추정
유재훈,안해성,Yoo Jae-Hoon,Ahn Hae-Seong 한국마린엔지니어링학회 2006 한국마린엔지니어링학회지 Vol.30 No.1
A model test was carried out, in order to verify the hydrodynamic performances of public 30 feet class sailing yacht. In the initial design stage, the performances and the running attitude of sail yacht including the hull form and sail plan, appendages were estimated by VPP, from which made the representative test conditions. A new experiment system such as captive model device was composed because the running attitude could be changed by wind conditions. The test results show that the minimum resistance is generated in the heeling 20 degree. which was expected in the initial design stage. It is thought to be the useful informations that the keel has an effects on hydrodynamic forces and resistance differences between the upwind and the downwind condition. Also this paper is associated with the state-of-the-art of calculating sailing yacht performance as this is performed in velocity Prediction program (VPP) The VPP results shows a typical shape of a sailing yacht and the designed yacht has the best performance at 120 degree angle of true wind with 20 knots.
공진형 인버터를 이용한 2단 유도가열 시스템의 주파수제어에 관한 연구
유재훈(Jae-Hoon Yoo),신대철(Dae-Cheul Shin) 한국조명·전기설비학회 2008 조명·전기설비학회논문지 Vol.22 No.1
제안한 유도가열 시스템은 증류탑 장치에 사용되는 특수충진체에 의한 열교환기술과 IH(Induction-Heating) 전자유도가열용의 특수한 고주파 전력회로 기술을 응용한 차세대 가열방식이다. 특히 일체의 연소과정이 없다는 점에서 작업환경의 개선이 가능하며 본 기술은 IGBT대응의 고주파 인버터를 사용하여 상용교류로부터 수[㎑]의 고주 파교류(HFAC)를 발생시킬 수 있다. 본 논문에서는 1.5[㎾]급 하프-브릿지 공진형 인버터 시스템과 공진부하의 동작해석, 특성분석 및 본 시스템을 이용한 2단가열 과열증기 발생장치의 개발과 시스템의 응용에 대해 논하였다. Proposed induction-heated system is innovative system which applied special high-frequency power circuit technique for thermal converse technique and IH(Induction-Heating) magnetic induction heating generated from induction-heated metallic package that is for distillation unit. In this occurs not burning, so that the working environment can be improved. This electromagnetic induction heating technique is used high frequency inverter. By using high frequency inverter high frequency alternative current (HFAC) in the range of [㎑] can be made with conventional alternative current. In this contribution IGBT module is used for high frequency inverter. In this paper are discussed action analysis and characteristics analysis of 1.5[㎾]-Class half-bridge resonant inverter system and resonant metallic package. In addition, by using this system, how two step heating superheated steam generator is developed and application of system are also discussed.