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An Experimental Study on Spray Characteristics of Directly Injected Bio-Ethanol-Gasoline Blended Fuel By Varying Fuel Temperature

직접분사식 바이오 에탄올-가솔린 혼합연료의 연료온도에 따른 분무 특성에 관한 실험적 연구

  • Lee, Seangwook (Department of Automotive Engineering, Kookmin University) ;
  • Park, Giyoung (Graduate School of Automotive Engineering, Kookmin University) ;
  • Kim, Jongmin (Graduate School of Automotive Engineering, Kookmin University) ;
  • Park, Bongkyu (Department of Automobile, Korea Polytechnic University)
  • 이성욱 (국민대학교 자동차공학과) ;
  • 박기영 (국민대학교 자동차공학전문대학원) ;
  • 김종민 (국민대학교 자동차공학전문대학원) ;
  • 박봉규 (한국폴리텍대학)
  • Received : 2014.01.17
  • Accepted : 2014.12.31
  • Published : 2014.12.30

Abstract

As environment problem became a worldwide issue, countries are tightening regulations regarding greenhouse gas reduction and improvement of air pollution problems. With these circumstances, one of the renewable energies produced from biomass is getting attention. Bio-ethanol, which is applicable to SI engine, showed a positive effect on the PFI (Port Fuel Injection) type. However, Ethanol has a problem in homogeneous mixture formation because it has high latent heat of vaporization characteristics and in the GDI (Gasoline Direct Injection) type, mixture formation is required quickly after fuel injection. Particularly, South Korea is one of the countries with great temperature variation among seasons. With this reason, South Korea supply fuel additive for smooth engine operation during winter. Therefore, experimental study and investigation about application possibility of blending fuel is necessary. This paper demonstrates the spray characteristics by using the CVC direct injection and setting the bio-ethanol blending fuel temperature close to the temperature during each seasons: -7, 25, $35^{\circ}C$. The diameter and the width of the CVC are 86mm and 39mm. High-pressure fuel supply system was used for target injection pressure. High-speed camera was used for spray visualization. The experiment was conducted by setting the injection pressure and ambient pressure according to each temperature of bio-ethanol blending fuel as a parameter. The result of spray visualization experiment demonstrates that as the temperature of the fuel is lower, the atomization quality is lower, and this increase spray penetration and make mixture formation difficult. Injection strategy according to fuel temperature and bio-ethanol blending rate is needed for improving characteristics.

Keywords

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Cited by

  1. An experimental study on spray and combustion characteristics based on fuel temperature of direct injection bio-ethanol-gasoline blending fuel vol.30, pp.11, 2016, https://doi.org/10.1007/s12206-016-1042-4