Journal of the American Oil Chemists Society

, Volume 61, Issue 10, pp 1610–1619 | Cite as

The effects of vegetable oil properties on injection and combustion in two different diesel engines

  • T. W. RyanIII
  • L. G. Dodge
  • T. J. Callahan
Technical

Abstract

Four different vegetable oils, each in at least 3 different stages of processing, have been characterized according to their physical and chemical properties, their injection and atomization characteristics, and their performance and combustion characteristics in both a direct-injection and an indirect-injection diesel engine. The injection and atomization characteristics of the vegetable oils are significantly different than those of petroleum-derived diesel fuels, mainly as the result of their high viscosities. Heating the oils, however, results in spray characteristics more like those observed with diesel fuel. The 2 engine types demonstrated different sensitivities to the composition of the various oils. The combustion characteristics and the durability of the direct-injection engine were affected by the oil composition. The indirect-injection engine, however, was not greatly affected by composition. Two different preliminary specifications have been proposed: a stringent specification including compositional requirements for direct-injection engines, and a less stringent specification for indirect-injection engines. The specifications are discussed in terms of the data and the rationale used in their development. Some precautions concerning the application of the specifications are also presented.

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Copyright information

© American Oil Chemists’ Society 1984

Authors and Affiliations

  • T. W. RyanIII
    • 1
  • L. G. Dodge
    • 1
  • T. J. Callahan
    • 1
  1. 1.Southwest Research InstituteSan Antonio

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