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RISS 인기검색어
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- 저자 : Byungchul Song(송병철) (검색결과 5 건)
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고고도 모사용 Centerbody Diffuser의 CB의 Nose Cone Angle 변화에 따른 유동 특성 연구
송병철(Byungchul Song),조성휘(Seongwhi Jo),김홍집(Hongjip Kim) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.5
고고도 환경을 모사하기 위한 디퓨저 장치 중 Center-body diffuser의 형상 변수 중 하나인 CB의 nose cone angle에 따른 수치해석과 질소를 이용하여 실험을 진행하였다. 2차목 길이비인 (L/D)st=6에서 시동압력변화에 따른 진공챔버 압력으로 디퓨저의 성능결과를 분석하였다. 난류 모델 k-ω SST와 k-ε standard로 해석을 진행하여 실험 결과와 비교 분석하였다. 그 결과, k-ω SST 모델이 시동 특성과 벽면의 압력을 모사하기에 적합하였다. 또한 CB의 각도 변화를 달리하여 시동 특성에 따른 진공 챔버의 압력 성능을 제시하였다. 5도의 nose cone angle의 진공챔버 압력이 15도보다 낮고, 5도와 15도 모두 45~50bara 사이에서 시동이 걸린다는 것을 확인하였다. The characteristics of center-body diffuser which has been used for high altitude simulation were evaluated for different angle of center-body both numerically and experimentally. The performance of vacuum pressure was analysed with operating pressure conditions based on second throat length ratio, (L/D)st=6. Two different turbulence model were adopted to validate with experimental wall pressure data. The Results showed that k-ω SST model agreed well with experiment in comparison to k-ε standard model. And then vacuum pressure were evaluated according to operating pressure conditions with different nose cone angle of center-body through k-ω SST model. Numerical results showed that center-body of 5° angle has lower vacuum pressure than center-body of 15°. And both diffusers were started under the operating pressure between 40~50 bara.
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고공모사용 Center-body 디퓨져의 형상 변화에 따른 성능 특성에 관한 수치적 연구
송병철(Byungchul Song),김홍집(Hongjip Kim) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.12
미사일이나 로켓은 고도가 높아짐에 따라 압력과 온도가 하강하여 지상과는 다른 외부 환경으로 인해 성능 및 구조적인 문제점이 발생한다. 어떠한 박리 없이 로켓의 노즐을 시험하기 위해서는 고고도 기압에 가까운 주위 압력이 형성된 환경조건에서 정확한 성능 특성을 파악해야한다. 고고도 환경을 모사할 수 있는 설비 중 하나인 CBD(Center-body-Diffuser)는 팽창비가 다른 연소기 및 엔진을 시험하더라도 내부 형상를 변경함으로써 다양한 고고도의 모사 압력을 형성할 수 있다. 본 논문은 CBD의 추천 길이비인 6과 8에서 설계변수인 CB(CenterBody)의 Nose cone angle(θc) 5°, 15°, 22.5°를 변경하여 성능 특성에 대해 수치적 연구를 하였다. The propulsion devices of missile and rocket face performance degradation problem according to increasing altitude because of temperature and pressure different from ground conditions. So it is essential that ground test must be carried out in the conditions similar to high-altitude environment to evaluate exact performance of propulsion without flow separation in nozzle. A key strength of CBD (CenterBody-Diffuser), which is one of the high-altitude simulating facilities, can simulate the various high-altitude pressure conditions by changing geometries of CB for all different expansion of engine and combustor. In this paper, the characteristics of CBD were investigated by numerical method with nose cone angle of CB(θc) 5°, 15°, 22.5° and along with second length ratio (L/D)st 6 and 8 as suggested values for supersonic diffuser.
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1960-70년대 한국 건축계의 공간-담론에 관한 연구
송병철(Song, Byungchul),조한(Joh, Hahn) 한국실내디자인학회 2018 한국실내디자인학회논문집 Vol.27 No.4
The concept of space is one of the many concepts of architecture that distinguishes architecture from other disciplines. Notwithstanding its current ubiquitousness, the concept of space was actually created by handful of art historians in 19C Europe, and since then has changed its meaning and scope as a rather strategic maneuver for architecture to establish its theoretical and professional autonomy among competing fields. However in Korea, 35 years of forced modernization by Japanese colonial rule, and subsequent Korean war, the emergence of spatial terms in korean architectural discourse is quite late in 1960-70s. So, the focus of this study is to investigate how the concept of space emerged, what kind of spatial concepts were particularly developed, and how they are utilized in the post-war social reconstruction era, especially through 〈SPACE〉 and 〈ARCHITECTURE〉, the leading architectural medias since 1960.
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조현권(Hyunkwon Jo),전오환(OhHwan Jeon),남종현(JongHyun Nam),송병철(ByungChul Song) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Recently the automotive industry has focused on reducing product development time to correspond with the customer’s demands quickly changed. The decreased product development time shortens the quality assurance period which makes it difficult to guarantee the quality of product. Therefore the conflict between development time and quality assurance occurs that customer’s expect actually higher quality is higher than in the past. To solve this problem, many automotive companies have tried to forge a system that verifies the various steps of development in advance. In many case the larger automotive companies have employed a virtual validation system and the Digital Mock-Up (DMU) to help ensure quality control. Domestic car maker era have recognized the importance of virtual validation systems and introduce, build properly and deploy it. But domestic automotive supplier era have a problem with building the system because the software is very expensive, there are few experts, and the system often fails to meet a company’s individual needs. For these reason many suppliers fail to successfully implement quality assurance procedure and just do it formally. In this paper, to approve this problem, we introduce the virtual validation system designed specifically for supplier; build the process and show the case; present the results which show positive effect.
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