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조성철(Seongcheol Cho),모동헌(Dongheon Mo),류정인(Jeongin Ryu) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The objectives of this study was to examine experimentally the microexplosion phenomena of single droplet W/O(water-in-oil) type emulsified fuel and to measure the combustion characteristics of single droplet emulsified fuel for microexplosion phenomena in atmospheric pressure condition.<br/> The larger quantity of adding water makes microexplosion phenomenon with higher intensity of sound level because larger water droplet has better coalescence for emulsified fuel. The small quantity of adding water makes puffing with lower sound level intensity. In latter period of extinction, large size droplet of the emulsified fuel breaks down rapidly to small size droplet, and microexplosion phenomenon occurs with multi step combustion.<br/>
유화단일액적의 특성에 관한 실험연구 (2) - 액적직경 변화에 관하여-
조성철(Seongcheol Cho),모동헌(Dongheon Mo),윤면근(Myunkeun Yoon),류정인(Jeongin Ryu) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The objectives of this study was to examine experimentally the variation droplet diameter of single droplet W/O type emulsified fuel. We measured the combustion characteristics of single droplet emulsified fuel for microexplosion phenomena in atmospheric pressure condition.<br/> Larger initial droplet diameter makes combustion rate constant(Cb) higher because the water droplet diameter of emulsified fuel increases by coalescence. It proves that the larger diameter fuel droplet has shorter time from ignition to extinction.<br/> In latter period of extinction, large size droplet of the emulsified fuel breaks down rapidly to small size droplet, and Microexplosion phenomenon occurs with multi step combustion. The combustion time is reduced as equivalence diameter of the emulsified fuel droplet decreases. This phenomenon occurs substantially with increase of adding water.<br/>
조성철(Seongcheol Cho),모동헌(Dongheon Mo),윤면근(Myunkeun Yoon),류정인(Jungin Ryu) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
The capacitance sensor design and emulsified fuel manufacturing verify characteristics of emulsified fuel, so it concluded the following conclusions.<br/> The first 24 hours after emulsified fuel manufacturing reveals separation ratio of 1.5%,maintains stable status, and verifies the stability of emulsified fuel.<br/> Adding more water increases the separation ratio rapidly, and adding more surfactant displays stable emulsification using by microscope. 10% added water displays 1㎛ of water droplet diameter distributed on oil droplet, and 30% water does 2㎛, In 6 hours after adding water, I % surfactant mixture makes water diameter 4 to 5 times bigger, and 2% does 2 times, and 3% does 2 times.<br/> In general, adding water makes the density of water diameter bigger, and adding surfactant mixture makes the size of water diameter smaller.<br/> In conclusion, the size of W/O type emulsified fuel water diameter is directly related to the volume of surfactant, and density of water diameter changes the distribution according to water content.
W/O형 유황연료의 안정성 측정을 위한 정전용량 센서개발
조성철(Seongcheol Cho),모동헌(Dongheon Mo),윤면근(Myunkeun Yoon),류정인(Jungin Ryu) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
We designed capacitance sensor for measuring capactance of W/O type emulsified fuel. Capacitance sensor consists of two conductors isolated by an insulator. The characteristics nature of a capacitance sensor is its ability to accept and store an electric charge. From using this concept, we carried out With manufacturing of capacitance sensor, the test results for validity of sensor and stability of 6 emulsified fuel conclude the followings.<br/> The result of capacitance measurement for 6 test fuels indicates design error range is within 4% max, so this fact proves the validity of capacitance sensor.<br/> Capacitance value of 6 emulsified fuel, with the aid of capacitance sensor, increases as water volume increases, but it decreases as surfactant increases when water is given equally.<br/> As a result, cylindrical type capacitance sensor proves validity of sensor and emulsified fuel which produce seperation ratio proves the stability of capacitance value.