Multidimensional Modeling of Spray Atomization and Air-Fuel Mixing in a Direct-Injection Spark-Ignition Engine

Paper #:
  • 970884

Published:
  • 1997-02-24
Citation:
Han, Z., Fan, L., and Reitz, R., "Multidimensional Modeling of Spray Atomization and Air-Fuel Mixing in a Direct-Injection Spark-Ignition Engine," SAE Technical Paper 970884, 1997, https://doi.org/10.4271/970884.
Pages:
21
Abstract:
A numerical study of air-fuel mixing in a direct-injection spark-ignition engine was carried out. In this paper, the numerical models are described and grid generation methods to represent a realistic port-valve-chamber geometry is discussed. To model a vaporizing hollow-cone spray resulting from an automotive pressure-swirl injector, a newly developed sheet spray atomization model was used to compute the processes of disintegration of the liquid sheet and breakup of the subsequent drops. Computations were performed of a particular 4-valve pent-roof engine configuration in which the intake process and an early fuel injection scheme were considered. After an analysis of the intake-generated flow structures in this engine configuration, the spray behavior and the spatial and temporal evolution of fuel liquid and vapor phases are characterized. It was found that the intake-generated flow interacts with the injected spray drops which strongly influences fuel (both liquid and vapor phases) distributions and air-fuel mixing.
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