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황오식(Oh-sik Hwang),김형모(Hyungmo Kim),박부민(Poomin Park),조명득(MyeongDeuk Cho) 한국추진공학회 2012 한국추진공학회 학술대회논문집 Vol.2012 No.11
인간 동력 항공기는 인간의 근력으로만 비행을 하는 항공기이다. 하지만 인간의 근력은 다른 동력기관에 비해 좋지 못한 동력원이다. 그래서 인간의 근력을 최대한 손실없이 동력으로 사용하는 것이 중요하다. 이를 위하여 동력전달 메카니즘을 파악하고 인간의 근력을 효과적으로 전달하기 위한 방법을 모색하기 위해 인간 동력 항공기의 동력부를 모사한 아이언버드를 제작하였다. 또한, 아이언버드를 이용하여 조종사의 훈련을 수행하였다. 아이언버드를 이용하여 동력전달장치의 구성에 따른 성능을 파악하였으며, 이를 인간 동력 항공기에 적용하기 위한 기초 자료로 활용하였다. A human powered aircraft flies using only human muscular strength. The human power is not efficient as power source compared with other engines. So, it is important to use the human power as lossless as possible. For this reason, Ironbird was manufactured by simulating the power system of the human powered aircraft in order to comprehend the mechanism of power transmission and develop the method to deliver the human power to a propeller with high efficiency. It can be also used for training pilots. To evaluate the performance of Ironbird, torque and speed were measured with various composition of power transmission system. And these data were used as supporting references to improve the human powered aircraft.
친환경 추진제를 이용한 200N급 엔진의 설계 및 성능에 관한 연구
이양석,전준수,황오식,고영성,김유,김선진,Lee, Yang-Suk,Jun, Jun-Su,Hwang, Oh-Sik,Ko, Young-Sung,Kim, Yoo,Kim, Sun-Jin 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.6
In the last decade, hydrogen peroxide has received renewed interest as a green propellant which is non-toxic, environmentally clean and relatively easy to handle. This study was performed to acquire the design technique and combustion performance of a 200N bi-propellant engine using hydrogen peroxide and kerosene. The engine which used a catalytic ignition method was designed and cold flow tests were carried out to investigate atomization characteristics. Combustion tests including a pulse mode operation were performed to investigate the combustion performance on various O/F ratios. The results showed that the combustion efficiency and the repeatability of the engine performance were enough to use as an essential database for the development of a high performance engine.
김태완(Tae-Woan Kim),황오식(Oh-Sik Hwang),고영성(Young-Sung Ko),정세용(Se-Yong Jung) 한국추진공학회 2009 한국추진공학회지 Vol.13 No.3
A gas mechanical pulsator is developed for the study of combustion instabilities in various combustors such as LRE combustor. First, it shows that the mass flow rates and the perturbation frequencies can be successively controlled by the inlet pressure and the rotating speed of a rotating disk with many holes. Second, the device is used as an acoustic amplification source as a substitute for the speaker in the previous acoustic tests and its results show almost the same resonant frequency and damping characteristics compared with the previous results. In conclusion, the result shows that it can be used as a substitute for a speaker in the studies of LRE combustion instabilities, which has a flow and no limitation of amplification, and a device for making a perturbation source in gas flow.