• Title/Summary/Keyword: Single droplet emulsified fuel

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An Experimental Study on the Sound Level Intensity Characteristics for Combustion of Single Droplet Emulsified Fuels (유화단일액적의 연소에 관한 소음 특성 연구)

  • Cho, Seong-Cheol;Oh, Yang-Hwan;Im, Seok-Yeon
    • Journal of the Korean Applied Science and Technology
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    • v.31 no.3
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    • pp.492-499
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    • 2014
  • The objectives of this study was to examine experimentally the microexplosion phenomena of single droplet W/O(water-in-oil) type emulsified fuel. Also, measured the combustion characteristics of single droplet emulsified fuel for microexplosion phenomena in atmospheric pressure condition. 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.

A Study on the Various Characteristics of Ultrasonic-Energy-Added W/O Type Emulsified Fuel (II) - attaching importance to micro-explosion of single droplet and chemical characteristics - (초음파에너지 조사 W/O type 유화연료의 제반특성에 관한 연구(II) - 단일액적 미소폭발 및 화학적 특성을 중심으로 -)

  • Kim, Yong-Cheol;Han, Keun-Hee;Ryu, Jeong-In
    • Journal of ILASS-Korea
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    • v.9 no.3
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    • pp.29-34
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    • 2004
  • To investigate characteristics and micro-explosion of single-droplets of emulsified fuel, water is mixed with diesel oil by using ultrasonic energy fuel feeding system. The fuel characteristics is analysed through H-NMR spectrum and micro-explosion phenomena of the emulsified fuel is also investigated. The life times of droplets of conventional diesel fuel, ultrasonic energy added diesel fuel and emulsified fuel we obtained additionally. According to this study, the micro-explosion phenomena of single-droplets happen in atmospheric pressure condition, a curve form of emulsified fuel's life tim is different from diesel fuel's one and the change of chemical structures is a cause of ultrasonic-energy-added diesel fuel effect.

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Breakup and Ignition Observation of n-Dodecane Emulsion Single Droplet using Two Pulse Lasers (독립된 두 레이저를 이용한 n-Dodecane 에멀전 단일 액적의 분열 및 점화 현상의 관찰)

  • Jang, Gyu Min;Jung, Yongjin;Lee, Min Jung;Kim, Nam Il
    • 한국연소학회:학술대회논문집
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    • 2015.12a
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    • pp.213-214
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    • 2015
  • Breakup and ignition of single droplet were experimentally investigated using two independent Nd-YAG lasers. The emulsified fuel was made from n-dodecane and water while varying the relative volumetric fraction. As a result of visualization, breakup and ignition behaviors were dependent on the fraction. Luminosity from the secondary droplets increased as the water fraction decreased. Ignition did not occur below 80% of the n-dodecane fraction.

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Effect of Ambient Temperature and Droplet Size of a Single Emulsion Droplet on Auto-ignition and Micro-explosion (단일 유화액적에서의 분위기 온도와 액적크기에 따른 자발화와 미소폭발의 영향)

  • Jeong, In-Cheol;Lee, Kyung-Hwan
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.1
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    • pp.49-55
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    • 2007
  • The characteristics of auto-ignition and combustion process of a single droplet of emulsified fuel suspended in a high-temperature air chamber have been investigated experimentally with various droplet sizes, surrounding temperatures, and water contents. The used fuels was n-Decane and it was emulsified with varied water contents whose maximum is 30%. The high-speed camera has been adopted to measure the ignition delay and flame life time. It was also applied to observe micro-explosion behaviors. The increase of droplet size and chamber temperature cause the decrease of the ignition delay time and flame life-time. As the water contents increases, the ignition delay time increases and the micro-explosion behaviors are strengthened. The starting timings of micro-explosion and fuel puffing are compared for different droplet sizes and the amount of water contents.