http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
대구수성알파시티 자율주행 서비스를 위한 퍼스널 모빌리티 실증 시나리오 개발에 관한 연구
권익환(Ickhwan Kwon),채석민(Seok-min Chae),정선호(Sun-ho Jung),오세일(Se-il Oh) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
Recently, the trend is changing due to continuous urbanization, expansion of the sharing economy market, and rapid development of advanced ICT. Accordingly, paradigm shifts in transportation services are taking place, and personal mobility(PM) is in the spotlight as the center of these changes. For the autonomous driving service, the PM demonstration scenario is a combination of relevant business types and various kinds of information, and a personalized autonomous driving demonstration considering the characteristics of the user, city, culture, infrastructure, and technical maturity is being conducted. In this paper, we analyzed the section definition and road conditions in Daegu Suseong Alpha-City. For the service scenario study, the main facility and zone characteristics were reflected and the demonstration section was defined by dividing into 4 sections. The PM presented various missions such as lane keeping and changing, passenger boarding, pedestrian recognition and avoidance, stop or moving vehicle recognition and avoidance by recognizing speed limit and important traffic information to drive the demonstration section.
냉각공기의 예냉각이 가스터빈 복합발전 성능에 미치는 영향
권익환(Ik Hwan Kwon),강도원(Do Won Kang),강수영(Soo Young Kang),김동섭(Tong Seop Kim) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.2
고온부에 해당하는 터빈 노즐과 로터의 냉각은 가스터빈의 성능에 큰 영향을 미친다. 본 연구에서는 냉각공기의 예냉각이 가스터빈과 복합화력 발전 성능에 미치는 영향을 알아보았다. 계산에 사용된 모델은 F-Class 가스 터빈이며 냉각을 고려한 터빈의 구성요소를 사용해 냉각공기의 변화에 대해 보다 정확한 모사를 구사하였다. 냉각공기의 예냉각에 따른 가스터빈의 성능변화를 나타내기 위해 탈설계 해석이 수행되었다. 노즐 및 로터의 냉각에 따른 성능 변화를 보다 정확하게 나타내기 위해 열역학적 냉각모델과 속도삼각형을 고려한 모델이 고려되었다. 또한 복합발전의 경우 냉각공기에서 추출된 열을 하부사이클에서 회수하여 스팀터빈을 구동하는데 추가적인 열을 공급하는 시스템이 구성되었다. 복합발전 시스템의 모든 냉각공기의 온도를 200K 예냉각하는 경우에 주유동가스의 유량증가로 인해 약 1.78%의 출력 증가를 나타내었으며 동일한 터빈 입구온도 유지를 위한 연료소모의 증가로 효율은 0.70% 포인트 감소하였다. Cooling of hot sections, especially the turbine nozzle and rotor blades, has a significant impact on gas turbine performance. In this study, the influence of precooling of the cooling air on the performance of gas turbines and their combined cycle plants was investigated. A state-of-the-art F-class gas turbine was selected, and its design performance was deliberately simulated using detailed component models including turbine blade cooling. Off-design analysis was used to simulate changes in the operating conditions and performance of the gas turbines due to precooling of the cooling air. Thermodynamic and aerodynamic models were used to simulate the performance of the cooled nozzle and rotor blade. In the combined cycle plant, the heat rejected from the cooling air was recovered at the bottoming steam cycle to optimize the overall plant performance. With a 200K decrease of all cooling air stream, an almost 1.78% power upgrade due to increase in main gas flow and a 0.70 percent point efficiency decrease due to the fuel flow increase to maintain design turbine inlet temperature were predicted.
냉각공기 예냉각이 가스터빈 복합발전 성능에 미치는 영향
권익환(Ik Hwan Kwon),강도원(Do Won Kang),김동섭(Tong Seop Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Cooling of hot sections, especially turbine nozzle and rotor blades, has a significant impact on gas turbine performance. In this study, the influence of cooling air precooling on the performance of gas turbines and their combined cycle plants were investigated. State-of-the-art gas turbines were selected and their design performance was deliberately simulated using detailed component models including turbine blade cooling. Off-design analysis was used to simulate changes in operating condition and performance of the gas turbines due to precooling of cooling air. An thermodynamic model was used to simulate the performance of cooled blades. In the combined cycle plant, the heat rejected from the cooling air was recovered at the bottoming steam cycle to optimize the entire plant performance. In the F-class gas turbine, almost 3% power upgrade was predicted with 200K decrease of all cooling air streams.
예냉각과 연료예열의 조합에 의한 복합발전 시스템의 성능변화
권익환(Ik Hwan Kwon),강도원(Do Won Kang),김동섭(Tong Seop Kim),김재환(Jae Hwan Kim) 한국유체기계학회 2011 유체기계 연구개발 발표회 논문집 Vol.2011 No.11
Effects of coolant pre-cooling and fuel pre-heating on the performance of a combined cycle using a F-class gas turbine were investigated. Coolant pre-cooling results in an increase of power output but a decrease in efficiency. Performance variation due to the fuel pre-heating depends on the location of the heat source for the pre-heating in the bottoming cycle (heat recovery steam generator). It was demonstrated that a careful selection of the heat source location would enhance efficiency with a minimal power penalty. The effect of combining the coolant pre-cooling and fuel pre-heating was also investigated. It was found that a favorable combination would yield power augmentation, while efficiency remains close to the reference value.