대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제34권11호
  • /
  • Pages.1005-1013
  • /
  • 2010
  • /
  • 1226-4881(pISSN)
  • /
  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
권호 표지
DOI QR코드

DOI QR Code

감압비등을 이용한 혼합연료의 분무제어에 관한 연구

Study on the Spray Control of Mixed Fuel Using Flash Boiling

  • 명광재 (조선이공대학 자동차과) ;
  • 윤준규 (경원대학교 기계.자동차공학과)
  • Myong, Kwang-Jae (Dept. of Automobile Engineering, Chosun College of Science & Technology) ;
  • Yoon, Jun-Kyu (Dept. of Mechanical & Automotive Engineering, Kyungwon Univ.)
  • 투고 : 2010.07.07
  • 심사 : 2010.08.26
  • 발행 : 2010.11.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

본 연구는 HCCI 엔진의 운전조건을 고려한 혼합연료의 감압비등 분무제어방법을 평가하기 위하여 수행하였다. 2상영역이 존재하는 혼합연료는 고비점성분의 증발촉진과 함께 연료분무의 급격한 증발을 유도할 수 있는 감압비등분무를 이용함으로써 저온 및 저밀도장에서 혼합기형성과정의 제어가 가능하다. HCCI 엔진은 이러한 분위기조건에서 연료를 조기분사하기 때문에 착화성이 높은 경유와 휘발성이 높은 가솔린성분으로 함유한 혼합연료의 감압비등현상을 이용함으로써 액체연료의 분열, 미립화와 같은 물리적 제어 및 착화연소에 의한 화학적 제어를 실현할 수 있다. 본 연구는 혼합연료의 성분과 몰분율을 주요변수로 설정하여 정적용기 내에 분사된 연료분무의 감압비등현상을 슐리렌 화상 및 Mie 산란광을 촬영한 후, 화상처리과정을 통하여 이루어졌다. 그 결과로 감압비등현상은 비교적 저온 및 저밀도장에서 분무구조가 크게 변화함을 알 수 있었으며, 조기 연료분사시기에서 감압비등분무를 이용한 혼합기형성을 제어함으로써 HCCI 연소에 적용이 가능할 것으로 분석하였다.

This study was conducted to assess the spray control of flash boiling with mixed fuel in consideration of HCCI (Homogeneous Charge Compression Ignition) engine condition. Mixed fuel existing in two phase regions can control the process of mixture formation under low temperature and density by using the spray resulting from flash boiling which is able to induce rapid evaporation of fuel spray as well as the evaporation of high boiling point component. Because HCCI engine injects the fuel early under ambient conditions, it can facilitate the chemical control of ignition combustion and physical control such as breakup and atomization of liquid fuel by flash boiling of mixed fuel which consists of highly ignitable light oil and highly volatile gasoline. This study was conducted by performing video processing after selected composition and molar fraction of the mixed fuel as major parameters and photographed Schlieren image and Mie scattered light corresponding to the flash boiling phenomenon of the fuel spray that was injected inside a constant volume vessel. It was found that flash boiling causes significant changes in the spray structure under relatively low temperature and density. Thus, we analyzed that the flash boiling spray can be used for HCCI combustion by controlling the mixture formation at the early fuel injection timing.

키워드

참고문헌

  1. Thring, R. H., 1989, "Homogeneous Charge Compression Ignition(HCCI) Engines," SAE Paper 892068.
  2. Kitano, K., Nishiumi, R., Tsukasaki, Y., Tanaka, T. and Morinaga, M., 2003, "Effects of Fuel Properties on Premixed Charge Compression Ignition Combustion in a Direct Injection Diesel Engine," SAE paper 2003-01-1815.
  3. Christensen, M., Hultqvist, A. and Johansson, B., 1999, "Demonstrating the Multi Fuel Capability of a Homogeneous Charge Compression Ignition Engine with Variable Compression Ratio," SAE paper 1999-01-3679.
  4. Sensa, J., Ikeda, M., Yamamoto, M., Kawaguchi, B. and Fujimoto, H., 1999, "Low Emission Diesel Combustion System by Use of Design Concept," SAE paper 99011136.
  5. Kawano, D., Senda, J., Kawakami, K., Shimada, A. and Fujimoto, H., 2002, "Fuel Design Concept for Low Emission in Engine 2nd Report : Analysis of Spray Characteristics for Mixed Fuels," SAE paper 2002-01-0202.
  6. Kawano, D., Senda, J., Shimada, A. and Fujimoto, H., 2002, "Fuel Design Concept for Low Emission in Engine 3rd Report : Analysis of Spray Characteristics for Mixed Fuels," SAE paper 2002-01-0220.
  7. Yoon, J. K., Myong, K. J., Senda, J., Fujimoto, H. and Cha, K. O., 2006, "A Study on Evaporative Characteristics of Multi-component Mixed Fuels Using Mie Scattered Light and Shadowgraph Images," Trans. of the KSME(B), Vol. 30, No. 7, pp. 682-691.
  8. Nishimura, H., Wada, Y., Yamaguchi, A., Yoon, J. K., Senda, J. and Fujimoto, H., 2006, "An Experimental Study on Flash Boiling Spray using Two-Component Fuel under the Condition of Advanced Injection HCCI," ICLASS 06-134.
  9. Park, S. B. and Lee, Y.S., 1994, "An Experimental Investigation of the Flash Atomization Mechanism," Atomization and Sprays, Vol. 4, pp. 159-179. https://doi.org/10.1615/AtomizSpr.v4.i2.30
  10. Friend, J. F., 1992, "NIST Mixture Property Database Users" Guide.
  11. Wada, Y., Yamaguchi. A., Nishimura. Y., Magara N., Yoon, J. K., Senda, J. and Fujimoto, H., 2007, "A Study on Possibility of Mixed Fuels to Control the Combustion Processes in Premixed Charge Compression Iginition Engine," Trans. of the JSAE, Vol. 38, No. 1, pp. 85-90.
  12. Naber, D. J. and Siebers, L. D., 1996, "Effects of Gas Density and Vaporization on Penetration and Dispersion of Diesel Sprays," SAE paper 960034.
  13. Reitz, D. R., 1990, "A Photographic Study of Flash Boiling Atomization," Aerosol Science and Technology, Vol. 12, pp. 561-569. https://doi.org/10.1080/02786829008959370