TESTS OF IGNITION IMPROVERS FOR ETHANOL: PHASE II

STUDIER AV TAENDNINGSEGENSKAPER HOS ETANOLBRAENSLEN: ETAPP II

Tests of a number of ignition improvers for ethanol have been conducted in a single cylinder direct-injected diesel engine of passenger car type. The improvers were mainly different polyethylene glycols (PEG). The aim of the experiments has been to find a more efficient species. The ignition improvers traditionally used for ethanol are different nitrates, and since they are related to a number of engine and environmental problems it is a wish to replace them. The improvers have been tested by measuring the ignition delay of ethanol with different percentages, at different engine inlet air temperatures. The tests have been conducted at a high engine speed and a low load since these are the most critical conditions for the ignition delay. The results show that the different polyethylene glycol derivatives yield rather small differences in ignition delay. The structure of the PEG-molecules, straight or branched, does not seem very important but the ignition delay decreases with the molecular weight. The possibilities of increasing the molecular mass are however limited, since this decreases the solubility. The most efficient improver is a nitrate ester. (A)

  • Corporate Authors:

    KOMMUNIKATIONSFORSKNINGSBEREDNINGEN

    BOX 5706
    STOCKHOLM,   Sweden  S-114 97
  • Authors:
    • Simonsen, H
    • Lif, A
  • Publication Date: 1995

Language

  • English

Media Info

  • Features: References;
  • Pagination: 43P+A p.

Subject/Index Terms

Filing Info

  • Accession Number: 00725260
  • Record Type: Publication
  • Source Agency: Swedish National Road and Transport Research Institute (VTI)
  • Files: ITRD
  • Created Date: Sep 26 1996 12:00AM