NTL-ENERGY AND ENVIRONMENT-ENERGY AND ENVIRONMENT;NTL-ENERGY AND ENVIRONMENT-Environment Impacts;
Abstract:
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.
Measurements of the noise generated by an SD40-2 diesel electric locomotive are described. The noise was measured in three types of moving tests: the ...
The intent of this study is to obtain information on small high-speed engines so that their effect on the urban environment may be assessed, and if ne...
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United States Department of Transportation
[PDF-5.29 MB]
