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DME-Propane 액화연료의 혼합특성에 대한 CFD 시뮬레이션
김차환 ( Cha Hwan Kim ),천석훈 ( Seuk Hoon Chun ),신동우 ( Dong Woo Shin ),김래현 ( Lae Hyun Kim ),이현찬 ( Hyun Chan Lee ),백영순 ( Young Soon Baek ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.2
In this study, CFD simulation was performed with commercial CFD code FLUENT for the 3D mixing tank model (1 m in a diameter and 2.5 m in a height) of DME-Propane liquified fuels, Initial condition set-up with existence of DME 146 l at the upper side of mixing tank and Propane 770 l at the lower side of mixing tank. Characteristics of mixture and fluid flow were observed for 34 hours simulation. Two liquid fuel were uniformly mixed within range of 3 mol% after 24 hours, and range of 1 mol% after 34 hours. The simulation result following 4 hours was verified with KOGAS experimental data.
이종욱(Jong-Wook Lee),김차환(Cha-Hwan Kim),이상철(Sang-Cheol Lee),김영일(Young-il Kim) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Despite short history, ABS is wide-spread even to small cars, which brought us a new concept in ABS. While ABS price is being lowered to enable car makers to install one without considerable up-cost, we meet another tendancy to develop pedal feeling improved version of ABS modulator especially for luxury cars.<br/> In this study, kick-back mechanism was investigated and with the result of which new hydraulic circuit was proposed to improve pedal feeling based on current ABS modulator being produced by Mando.<br/> New ABS modulator was developed, followed by design of parts and packaging needed accordingly. Evaluation of new modulator via rig test and vehicle test shows that the pedal feeling is successfully enhanced.<br/>
보문 : 공정시스템·공정설계·이동현상·화학고정안전·플랜트엔지니어링 ; DME-LPG 순차 혼합시 저장탱크 내의 혼합특성
천석훈 ( Suk Hoon Cheon ),김차환 ( Cha Hwan Kim ),신동우 ( Dong Woo Shin ),김래현 ( Lae Hyun Kim ),이현찬 ( Hyun Chan Lee ),백영순 ( Young Soon Baek ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.3
DME 및 LPG 혼합연료에 대한 혼합도 분석 실험을 수행하였다. DME 20 wt%와 LPG(주성분 프로판) 80 wt%를 탱 크에 순차적으로 주입하여 시간 경과에 따라 탱크의 각 측정부에서의 농도를 측정하였다. 먼저 DME가 주입되고 그 후에 프로판이 주입되면서 DME의 일부는 혼합이 되나 일부는 혼합이 되지 않고 밀도차에 의해서 탱크 하부로 가라 앉게 되는 층상화 현상이 발생하였다. 1일 경과 시 약 0.2~0.3 wt%의 증가비율로 두 연료가 혼합되어 완전히 균일하 게 되기까지 약 500시간 이상이 소요되었다. 또한 재순환 펌프를 가동하여 탱크 내 연료를 순환 시킨 후 혼합 연료의 성분을 측정한 실험에서는 DME와 프로판이 균일하게 혼합됨을 확인하였다. To study characteristics of DME and Propane blended fuel in mixing drum as time passed, mixing experiment of two components was performed. After 20 wt% of DME and 80 wt% of Propane were injected into mixing drum sequentially, and the mixture ratio of blended fuel was analyzed at several sampling ports. Consequently, DME and Propane were not easily mixed and DME was sunk to the bottom of the mixing drum by the density difference. The daily rate of DME ingredient increase was 0.2-0.3 wt%, and it took over 500 hours until two of them were mixed uniformly. And after recirculation of blended fuel in mixing drum, DME and Propane were mixed immediately and uniformly.