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신석재(Suk-Jae Shin),김종일(Jong-IL Kim),한인수(In-Su Han),김흥일(Heung-IL Kim),정영철(Young-Chul Jung),최두석(Doo-seuk Choi) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
An experimental study on the exhaust heat recovery device of automobiles develop the exhaust heat recovery device of automobiles and test this equipment and install the back of catalysis convertible. This equipment have the existing BASE and new EHRS, T-EHRS. It has many conditions that load 0% and load 10% test rpm which are Idle, 1000rpm, 1500rpm, 2000rpm, 2500rpm and 25℃~80℃ of temperature of cooling water time by Warm-up. Idle coditions , load 0% and load 10%, same BASE, EHRS and T-EHRS. But this study looked at the load 0% have improved about 13% and load 10% have improved about 16% by rpm.
PIV 에 의한 코 호흡 시 기도 내 주기적 공기유동에 관한 연구
김성균(Sung Kyun Kim),신석재(Shin Suk Jae) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
CT 사진을 이용하여 살아있는 사람의 호흡기의 컴퓨터 모델을 얻고, RP 를 이용하여 고형 모형으로 정교한 호흡기 유로 모형을 제작하였고, 호흡을 정확하게 모사하는 펌프를 만들었다. 사람의 호흡 데이터를 이용하여 캠을 제작하고 대형 피스톤 펌프를 만들어 사람의 호흡을 정확 하게 모사하였다. 이를 이용하여 생리적 주기를 갖는 호흡기 내 유동에 대한 PIV 결과를 획득하였다. 최초로 정확한 기하학적 형상 및 입구와 출구 조건 하에서 인후부와 기관 내의 공기 유동장의 데이터베이스를 확보하였으므로, 향후 기존의 단순화된 모델을 이용한 실험적 수치해석적 결과들을 검정하는데 활용될 것이며 호흡기 질환의 진단과 치료에 기여할 수 있는 생리학적 병리학적 데이터를 제공 할 수 있으리라 생각된다. 또한 공해 물질, 유독물질, 흡입 약품 등의 호흡기 내 흡착 현상 규명등에도 활용될 수 있을 것으로 보인다. The mean and RMS velocity field in the sagittal plans of human airway was studied experimentally by particle image velocimetry (PIV). Some researchers investigated the airflow of mouth breathing both experimentally and numerically. But it is very rare to investigate the airflow of nose breathing in a whole airway due to its geometric complexity. We established a procedure to construct a transparent rectangular box containing a model of the nasal cavity for PIV measurement by combination of the RP and the curing of clear silicone. We extend this to make whole airway including nasal cavities, larynx, trachea, and 2 generations of bronchi. The CBC algorithm with window offset (64*64 to 32*32) is used for vector searching in PIV analysis. The phase averaged mean and RMS velocity distributions in Sagittal and coronal planes are obtained for 7 phases in a respiratory period. Some physiologic conjectures are obtained. The main stream went through the backside of larynx and trachea in inspiration and the frontal side in expiration. There exist vortical motions in inspiration, but none in expiration.
박충열(Chung-Yeol Park),김종일(Jong-IL Kim),신석재(Suk-Jae Shin),최두석(Doo Seuk Choi) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
It is caused that combustion performance of engine is increasing effects according to the controling back pressure. Therefor, Exhaust variable valve is installed around the automation silencer. After the exhaust variable has analysed with the reckoning stress distribution to affect in valve, the design factor was analysed with influence. Therefor, It has to translate between the conditions an variables. After results, the distribution of pressure has been indicated when it have condition on the convex face. The distribution was indicated the most alike as pressure and stress that diameter about 42mm and depth to height 5mm in model between the stress and strain. If this interpretation of using it. That’s possible to reduce the time and cost about a valuation.
홍영준(Young-Jun Hong),최두석(Doo seuk Choi),신석재(Suk-Jae Shin),이경태,정영철(Young-Chul Jung),김종일(Jong-IL Kim),김희진(Hee-Jin Kim),윤영철(Young-Chul Yoon),한인수(In-Su Han) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In this study, the Exhaust heat recovery system uses waste heat of cold start. This system will be improved efficiency regarding oil temperature of car engine at the beginning, then it will be improved efficiency of fuel efficiency and car engine. This study has developed exhaust heat recovery system because of checking the fast warm-up of the engine. There are heat exchange area of the exhaust gas and cool water within exhaust heat recovery system. It made the area different so that this study can check the performance regarding exhaust heat recovery system. The performance evaluation use the a gasoline engine. This test has proceed in the condition. The condition of warm-up fitted with Load-0%. after that the study checked the time from starting up the engine to warm-up. So this study can confirm to shortening the time of warm-up of exhaust heat recovery system.
화학수소화합물을 이용한 소형 무인항공기용 연료전지 시스템 연구
홍지석(Ji-Seok Hong),정원철(Won-chul Jung),김현진(Hyeon-jin Kim),이민재(Min-Jae Lee),정대성(Dae-Seong Jeong),전창수(Chang-Soo Jeon),성홍계(Hong-Gye Sung),신석재(Seock-Jae Shin),남석우(Suk-Woo Nam) 한국항공우주학회 2013 韓國航空宇宙學會誌 Vol.41 No.3
소형 무인항공기의 동력장치로 연료전지 시스템을 적용하기 위해 화학수소화합물 수소 저장방법을 이용한 소형 수소 발생 제어장치를 설계하였다. 효율이 높은 소형/경량 수소 발생 제어장치를 설계하기 위하여 NaBH4 수용액 공급 유량에 따른 Co-B 촉매의 수소 전환율을 확인하였고, 100W 스택의 최대 수소 발생량에 적합한 Co-B 촉매양을 제안하였다. 효율적인 연료 소모를 위해 Dead-end 방식의 스택을 선택하였고, 수소 발생 제어장치 내부 압력을 이용한 펌프 on/off 제어로 수소 생성량을 제어하였다. 소형 수소 발생 제어장치를 이용한 연료전지 시스템의 각 작동구간에서 안정된 운전을 확인하였다. 장시간 운전 실험을 통하여 최대 7시간 운전이 가능하며, 임의의 비행 프로화일에 요구되는 추력 프로화일은 최소 4시간 이상 조정 가능함을 확인하였다. A compact hydrogen generation device of fuel cell system using chemical hydride storage technique was designed to fit the propulsion device requirement of a small unmanned aerial vehicle(SUAV). For high efficient, compact, and lightweight hydrogen generation control device, the Co-B catalyst hydrogen conversion rate by NaBH4 aqueous solution flux is measured so that the proper amount of Co-B catalyst for maximum hydrogen generation of 100W stack was proposed. A compact hydrogen generation device is controlled by pumps on/off using its own internal pressure and consumes fuel in high efficiency through a dead-end type fuel cell. The fuel cell system has stable operation for a planed flight profile. The system operates up to maximum 7 hours and at least 4 hours for tough flight profiles.