Analysis of spray evolution in internal combustion engines using numerical simulation

Kadocsa, András and Tatschl, Reinhard and Kristóf, Gergely (2007) Analysis of spray evolution in internal combustion engines using numerical simulation. JOURNAL OF COMPUTATIONAL AND APPLIED MECHANICS, 8 (1). pp. 85-100. ISSN 1586-2070

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Abstract

Numerical simulation is a widely used research tool in internal combustion related research. This paper summarizes results of research on a new approach of spray formation calculations. Using a primary breakup model for separately describing the initial liquid disintegration of injected liquid based on the flow properties stemming from a previous calculation of injector nozzle flow gives a better predicting capability and is able to suit the new needs of advanced combustion systems such as HCCI engines or various forms of split injection. The child breakup mechanism provides the necessary droplet surface for evaporation in the vicinity of nozzle, but it causes bimodality in the size spectrum, hence there is an unrealistic factor behind seemingly good agreement of calculation results and measurement data. The new homogenous distribution child production model proposed here is aimed at reducing this effect, and providing a more even size distribution while retaining good agreement with measurement data in other aspects of examination.

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