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CFD 시뮬레이션을 이용한 이젝터 혼합실 형상에 따른 성능 평가에 관한 연구
신원협(Sin, Won-Hyeop),김민우(Kim, Min-Woo),박영철(Park Young Chul) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.5
이젝터는 펌프의 일종으로서 고압의 유체가 지닌 압력에너지를 이용하여 흡입 유체를 빨아들여 이송하는 기계장치이 다.본 논문은 유한체적법 기반의 CFD분석을 이용하여 이젝터의 성능에 영향을 미치는 혼합실 형상에 따른 영향을 조사하 였다.혼합실 내부의 노즐 직경과 노즐목 길이,그리고 노즐 끝단과 유체가 외부로 빠져나가는 디퓨저 입구까지의 거리를 변화시키면서 성능을 좌우하는 흡입유체가 가장 잘 흡입되는 최적의 조건을 조사하였다.연구 결과 이젝터의 성능은 노즐의 직경이 가장 큰 영향을 나타내는 것을 확인하였다.혼합실 내부 노즐의 직경이 감소함에 따라 혼입율이 증가하는 것을 확인 하였고 노즐 직경이 증가할수록 혼입율이 감소되는 것을 확인하였다.반면 노즐목 길이,노즐끝단과 디퓨저 입구까지의 거리 에 대한 영향은 미비한 것으로 확인되었다.마지막으로 CFD분석 자료를 토대로 인공신경망을 이용하여 더욱 구체적인 이젝 터 혼합실 형상,노즐 직경 23.8mm를 제시하였다. An ejector is a kind of pump which is using pressure energy of high pressure fluid. This study aims to investigate performance influencing according to change the ejector mixing section shape using CFD simulation by Finite Volume Method. Optimum conditions were suggested 3 kind of variable such as nozzle diameter, nozzle length, distance from nozzle tip to the diffuser inlet. The results, It was confirmed that the diameter of the nozzle was the greatest effect in performance of the ejector. The diameter of the nozzle get smaller, mixing ratio was increased. On the other hand, nozzle length, distance from nozzle tip to the diffuser inlet had little effect on performance. It was proposed specific Mixing section, Nozzel diameter 23.8mm using the Artificial Neural Network.
장기 카메라트래핑 모니터링 자료를 활용한 도시근교의 고라니 및 멧돼지 일주기성 연구
한윤하,신원협,김지환,김도희,윤지원,이석영,김용환,이승현,송영근 한국환경복원기술학회 2024 한국환경복원기술학회지 Vol.27 No.2
This study aimed to figure out diel activity patterns of water deer and wild boar, whose habitat is disturbed by human activity in a suburban area. Photographic data of water deer and wild boar collected by 18 camera traps from January 2021 to November 2022 was categorized into four diel periods (dawn, day, dusk, and night), and converted into frequencies per 100 CTD (Camera Trap-Days) for seasonal and spatial diel activity pattern analysis. Water deer exhibited intense nocturnality in fall, and wild boar did in fall and winter. During the fall, water deer's night-time capture rate was the highest (61.9%), and day-time photographic rate was the lowest (13.9%) among other seasons. During the fall and winter, wild boar's night-time photographic rate was relatively high (77.6%, 78.0%, respectively), and day-time photographic rate was relatively low (0.7%, 1.8%) in comparison with other seasons. In spatial diel activity analysis, both water deer and wild boar showed a tendency to avoid humans, especially near trails during day-time hours. The day-time photographic rate of water deer in trail-near group was 12.1% and trail-far group was 24.6%. The day-time photographic rate of wild boar was 3.4%, 5.7%, respectively. Because the diel activity patterns of wildlife reflect human disturbance, this study provides useful ecological information for developing appropriate management plans for the coexistence of water deer and wild boar in suburban areas.
장진우(Jang, Jin-Woo),신원협(Sin, Won-Hyeop),박영철(Park Young Chul) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.11
본 논문은 기체-액체 이젝터의 수치해석연구에 초점을 맞추고 있다. 이젝터는 구동유체가 노즐을 통해 고속으로 분출 될 때, 구동노즐 출구 주변에 진공압이 형성되어 주변의 기체와 운동량 교환을 통하여 저압의 유체를 보다 높은 압력으로 압축하여 수송하는 장치이다. 기체-액체 이젝터는 상용 소프트웨어 ANSYS-CFX 14.0을 사용하여 다상의 CFD 분석을 통해 연구한다. 구동유체는 물을 사용하여 구동되며, 실제로는 공기가 아닌 오존을 사용하여 배출 된다. 기체-액체 이젝터의 디퓨저의 형상에 따라 성능 차이를 비교한다. 결과 기체-액체 이젝터의 성능에 미치는 다양한 요인을 제공 한다. 그리고 제안 된 수치 모델은 기체-액체 이젝터의의 최적 설계에 매우 도움이 될 것다. This paper performed a numerical study of an air-liquid ejector. An ejector is a fluid-transportation device that spouts high-pressure fluid from driving pipes using the kinetic energy of the spouted fluid and increases the pressure through the exchange of momentum with the surrounding gases of the lower pressure. The air-liquid ejector was investigated through steady three-dimensional multiphase CFD analysis using commercial software ANSYS-CFX 14.0. Water as the primary fluid is driven through the driving nozzle and air is ejected as the second gas instead of ozone in real applications. The difference in performance according to the shape of the diffuser of the ejector was examined. The results provide deep insight into the influence of various factors on the performance of the air-liquid ejector. The proposed numerical model will be very helpful for further design optimization of the air-liquid ejectors.
선박용 질소발생장치 효율 증대를 위한 mixing chamber 설계 변경 방안 연구
유찬욱,최주형,김정환,신원협,류영춘,이경우,김정렬 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Petroleums or chemical cargo transported Tankers are have to be installed inert gas system to prevent explosion. Inert gas system is to ensure that less than 5% the oxygen content in the cargo tanks condition to avoid the explosion range. In the nitrogen generation type inert gas system, the flow control within the Mixing Chamber has more effect of the overall N2 ratio. In this paper, study for N2 ratio rise method by mixing chamber`s inner design change use computational analysis methods.