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An investigation on the spray characteristics of DME with variation of ambient pressure using the common rail fuel injection system

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Abstract

We investigated the DME spray characteristics about varied ambient pressure and fuel injection pressure using the common rail fuel injection system when the nozzle holes diameter is varied. The common rail fuel injection system and fuel cooling system were used since DME has compressibility and vaporization at atmospheric temperature. The fuel injection quantity and spray characteristics were measured. The spray was analyzed for spray shape, penetration length, and spray angle at the six nozzle holes. There are two types of injectors: 0.166 mm diameter and 0.250 mm diameter. The ambient pressure, which was based on gage pressure, was 0, 2.5, and 5 MPa. The fuel injection pressure was varied by 5 MPa from 35 to 70 MPa. By comparing with the common injector, using the converted injector it was shown that the DME injection quantity was increased 127% but it didn’t have the same low heating value. Both the common and converted injectors had symmetric spray shapes. In case of converted injector, there were asymmetrical spray shapes until 1.2 ms, but after 1.2 ms the spray shapes were symmetric. Also, the converted injector had shorter penetration length and wider spray angle than the common injector.

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Authors and Affiliations

  1. Graduate School of Mechanical and Automotive Engineering, Ulsan University, 102 Daehak-ro, Nma-gu, Ulsan, 680-749, Korea

    Sejun Lee

  2. Green Powertrain System R&D Center, Korea Automotive Technology Institute, 74 Yongjeong-ri, Pungse-myeon, Dongnam-gu, Cheonan-si, Cungnam, 330-912, Korea

    Soojin Jeong

  3. Department of Mechanical and Automotive Engineering, Ulsan University, 102 Daehak-ro, Nma-gu, Ulsan, 680-749, Korea

    Ocktaeck Lim

Authors
  1. Sejun Lee
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  2. Soojin Jeong
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  3. Ocktaeck Lim
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Correspondence to Ocktaeck Lim.

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Recommended by Associate Editor Kyoung Doug Min

Ock-Taeck Lim received his B.S. and M.S degrees in Mechanical Engineering from Chonnam National University, Korea, in 1998 and 2002 respectively. He then received his Ph.D from Keio University in 2006. Dr. Lim is currently a Professor at the School of Automotive and Mechanical Engineering at Ulsan University in Ulsan, Korea. His research interests include internal combustion engines, alternative fuel and thermodynamics.

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Lee, S., Jeong, S. & Lim, O. An investigation on the spray characteristics of DME with variation of ambient pressure using the common rail fuel injection system. J Mech Sci Technol 26, 3323–3330 (2012). https://doi.org/10.1007/s12206-012-0806-8

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  • DOI: https://doi.org/10.1007/s12206-012-0806-8

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