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이동원(Dongwon LEE),권진경(Jinkyung KWON),김태욱(Taewook KIM),김병지(Byungji KIM),권순범(Soonbum KWON) 한국항공우주학회 2006 韓國航空宇宙學會誌 Vol.34 No.2
충격파관을 이용하여 NACA와 이중쐐기 날개 주변의 천음속 유동에 대한 실험적 연구가 수행되었다. 벽면효과와 반사충격파의 영향을 최소화하기 위해 슬랏벽과 챔버를 가지는 실험부가 설계되었으며 이를 통해 충격과관을 비교적 높은 레이놀즈수의 천음속 유동을 발생시키는 간단하고 경제적인 풍동장치로 이용하고자 하였다. 열기류 마하수 0.80~0.84, 레이놀즈수 약 1.2×10? 받음각 0°와 2°의 유통 조건에서의 천음속 날개 유동은 새도우그 래프법에 의해 가시화되었다. 날개 주변의 충격파 분포는 기존의 일반 천음속 풍동 실험의 결과와 비교되었다. 실험결과는 본 실험에 사용된 충격파관은 실험 마하수 범위와 날개에 대해 천음속 풍동으로서의 유효한 성능 특성을 나타내었다. An experimental study of the transonic flows over NACA and double wedge airfoils was conducted with a shock tube. The configuration of test section with a slotted wall and chamber was designed and tested to minimize wall and reflected shock wave effects and use the shock tube as simple and less costly wind tunnel generating the relatively high Reynolds numbers transonic flow. Transonic airfoil flows at hot gas Mach numbers of 0.80~0.84, Reynolds number of about 1.2×10? on airfoil chord length and angles of attack of 0° and 2° were visualized with the shadow graph method. The shock wave profiles on the airfoils were compared with the corresponding results from the conventional transonic wind tunnel tests. The experimental results showed that present shock tube exhibited the proper performance characteristics as transonic wind tunnel for tested Mach number range and airfoils.
Effect of heat pump performance improvement by use of thermal tank with temperature seperation plate
문종필(Moon, Jongpil),이성현(Lee, Sunghyoun),권진경(Kwon, Jinkyung),강연구(Kang, YounKoo),이수장(Lee, Sujang) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
This study was carried out in order to estimate the effect of heat pump performance by use of thermal tank with 3 seperation plates which were able to divide thermal tank into 3 chambers that have different temperatures levels. For testing the effect of developed thermal tank which was installed for supplying the heat to the paprika greenhouse in Jinju city. The volume of thermal storage tank was designed for 110m³ which was able to cover 30% of heating capacity. The temperature difference was 3 degree Celcius between high temperature and low temperature when only heating circulation was made from heat pump to thermal tank. but 5.5 degree Celcius difference was made when heating circulation of heat pump to thermal thank and hot water supplying circulation of thermal tank to greenhouse was done simultaneously. As a result of this study showed that COP of heat pump was increased by 15% or more than that of using normal thermal tank because heat pump was able to take 3 ~ 5 degree Celcius lower thermal thank water constantly.