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고공환경 모사용 Center Body Diffuser의 시동 특성에 관한 실험적 연구
연해인(Hae In Yeon),유이상(Isang You),김완찬(Wan Chan Kim),임지녕(Ji Nyeong Im),고영성(Young Sung Ko) 대한기계학회 2016 大韓機械學會論文集B Vol.40 No.2
본 연구에서는 고고도의 저압 환경을 모사하기 위한 CBD(Center Body Diffuser)의 시동특성에 대한 실험적 연구를 수행하였다. Center Body Diffuser의 형상을 다양하게 구성할 수 있도록 실험 장치를 설계/제작하여, 상온 유동 실험을 통해 CBD 형상에 따른 저압환경 구현 성능과 시동 특성을 관찰하였다. 실험 결과 센터바디의 수축각이 약 15도 일 때 시동압력이 가장 낮은 것을 확인하였다. 또한 디퓨저 입구부 길이(Ld/Dd)가 감소할수록, 확산부 길이(Ls)가 증가할수록 시동특성이 크게 향상되었다. 또한 디퓨저 입구부 길이(Ld/Dd) 변화만을 통해 진공 챔버 압력을 조절할 수 있는 CBD만의 설비적 장점을 확인하였다. An experimental study has been conducted to verify the startup characteristic of a Center Body Diffuser (CBD) for simulating a low pressure environment when at high altitudes. Vacuum chamber pressure and startup characteristics of the CBD were investigated according to various geometries of the center body structure by a cold gas flow test. The test results show that the startup pressure is lowest when the center body contraction angle is approximately 15°. The startup characteristic of the CBDs significantly improves when the diffuser inlet length (Ld/Dd) is decreasing and the divergence length (Ls) is increasing. Additionally, it is possible to simulate various high altitude, low pressure conditions for various rocket engines that have different nozzle expansion ratios by adjusting the center body"s position inside the diffuser.
상온 가스를 이용한 환형 이젝터의 성능 변수에 대한 실험적 연구
연해인(Haein Yeoun),유이상(Isang Yu),우희찬(Heechan Woo),임지녕(Jinyeong Im),고영성(Youngsung Ko),방정석(Jeongseok Bang) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.5
환형 이젝터는 중앙분사형 이젝터에 비해 냉각 특성 등의 장점을 가지며, 고공환경 지상구축 설비뿐만 아니라 RBCC 의 ramjet mode 와 같이 활용 범위가 넓고 실용적이다. 따라서 본 연구에서는 환형 이젝터의 형상 및 성능변수에 따른 이젝터 성능을 확인하고자 하였으며, 차후 중앙분사형 이젝터와의 성능 비교를 위해 실험적 연구를 수행하였다. The annular ejector has advantages of cooling characteristic etc over the axial symmetric ejector and can be more practical and widely used like RBCC ramjet mode as well as high altitude environment establishing equipments. In this study, the ejector performance of an annular ejector was experimentally investigated according to performance parameters and ejector configuration. This results of the annular ejector will be compared with those of the axial symmetric ejector in the future.
연해신(Yeon Hae-Jin) 한국문학회 2003 韓國文學論叢 Vol.34 No.-
I probed into the popular consciousness reflected in the labor songs. The labor songs, which have been generated spontaneously so as to double the action unification of workers and the fruits of hard work, show us joys and sorrows, value, consciousness, and emotion owned by the farmers. The characteristics of the labor songs are as follows: First, they are everyday songs containing the thoughts and emotions of the people. They are also the expressions of their simple and artless lives. Therefore, the contents of those songs don't have some magnificent side, use a trick, and have an ornamentation. Second, they are absorbed in the actual. The survival of the people depends upon the continuation of labors. Feeling all kinds of worth and conflict in their working jobs, the poor people haven't known an ideological or abstract world at all. Therefore, they have thought much of a story of their personal experiences rather than of the expectation about the past or the future. Third, they are made up of a kind of direct self- expressions. For the people who have lived together with nature, refined descriptions and complex ornamentations were not appropriate. They were familiar only with artless honesty and naive simplicity. Fourth, they are expressed in many hackneyed words. They don't marshal all sorts of flowery words. nor show a marked individuality. They show us only the pure emotions of the people as they are. Labor songs have advanced in good order such as those for farming, those for weaving, those for milling, and those for picking. In the northern parts of Ch'ungbuk, Danyang and Chech'on, the labor songs for dry field fanning and those for picking something had a great vogue more than anything else. In the central and southern parts of Ch'ungbuk Ch'ongwon, Chinchon, Polin, Yongdong - the labor songs for tilling a rice field ranged all over the region. The labor songs for weaving have spread everywhere from the northern parts to the southern parts of Ch'ungbuk.
고공환경 모사용 Center Body Diffuser의 형상 변화에 따른 시동 특성에 관한 실험적 연구
연해인(Haein Yeoun),유이상(Isang Yu),김완찬(Wanchan Kim),임지녕(Jinyeong Im),고영성(Youngsung Ko) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.12
우주발사체 상단 추진기관의 고공환경 모사시험에 활용할 수 있는 Center Body Diffuser의 작동특성을 상온 실험을 통해 확인하였다. 본 연구에서는 Center Body Diffuser의 형상을 다양하게 구성할 수 있도록 실험 장치를 제작하여, 형상에 따른 저압환경 구현 성능과 시동 특성을 관찰하였다. 실험 결과 센터바디의 수축반각이 약 15° 일 때 시동압력이 가장 낮은 것을 확인하였으며 디퓨저 내부에 장착된 Center Body 위치를 조절하여 동일한 디퓨저 설비로 노즐 팽창비가 다른 다양한 엔진의 고고도 환경을 구현할 수 있음을 확인하였다. An operating characteristic of CBD(Center Body Diffuser) which is used for high altitude simulation test of upper stage rocket engine, has been experimentally investigated by small-scale cold gas flow test. Vacuum chamber pressure and startup characteristics of the CBD were investigated according to various geometries of center body structure. The test results show that startup pressure is lowest when the center body contraction half angle is about 15°. Also it is possible to simulate various high altitude low pressure conditions for various rocket engines which have different nozzle expansion ratio by adjusting center body’s position inside diffuser