RATE OF HEAT RELEASE IN DIESEL ENGINES

In this report, the concept of heat release in diesel engines is compared with reaction rates in petrol engines as a means of describing combustion. The intimate relationships between heat release, cylinder pressure development and cylinder pressure spectra are illustrated. A combustion model for the prediction of heat release and combustion noise, based primarily on physical aspects of diesel combustion system design, is put forward. This model indicates that fuel droplet size and the temperature of the cylinder contents are of prime importance in determining cylinder pressure noise excitation. The relationship between cylinder pressure spectra and combustion induced engine noise is described and used to show how the combustion model can predict combustion induced noise at the design stage. A simplified procedure based on the results of this modelling is put forward to predict combustion induced noise as a function of rate of pressure rise, speed and bore and applied to a Standard Engine Structure. As an approximation the prediction formulae are also given in terms of initial peak rate of heat release, engine speed and bore. Mechanical noise aspects of diesel engines, although important, are excluded from the work. (Portions of this document are not fully legible)

  • Corporate Authors:

    Southampton University, England

    Institute of Sound and Vibration Research
    Southampton S09 5NH, Hampshire,   England 

    Transportation Systems Center

    55 Broadway, Kendall Square
    Cambridge, MA  USA  02142
  • Authors:
    • Anderton, D
  • Publication Date: 1977-10

Media Info

  • Pagination: 147 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00169744
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: DOT-TSC-OST-77-56 Final Rpt.
  • Contract Numbers: DOT-TSC-1101
  • Files: NTIS, TRIS
  • Created Date: Mar 14 1978 12:00AM