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Abstract

The stringency of recent engine emission standards requires accurate three-dimensional modelling of the processes of fuel-spray evolution, autoignition, combustion and emissions formation, together with the evolution of the flowfield. This paper describes progress in diesel combustion modelling for industrial design of engines, using the SPEED code. SPEED is a fully-implicit finite-volume code using an unstructured mesh permitting body-fitting and mesh adaptation with minimum distortion and memory usage. Models in the current version, SPEED-DC1, include the representation of spray as a stochastic ensemble of Lagrangian droplets, autoignition by a generic low-temperature chemical kinetics scheme, and combustion using the conventional Mangussen model. Future developments, including p.d.f. modelling to account for subgrid-scale inhomogeneous fuel distributions and for soot formation, are also outlined. Results from the code are discussed with reference to experimental comparisons with DI and IDI engines.

Additional information

Authors: GOSMAN A D, Imperial College of Science, Technology and Medicine, Department of Mechanical Engineering, London (GB);KRALJ C, Imperial College of Science, Technology and Medicine, Department of Mechanical Engineering, London (GB);MAROONEY C J, Imperial College of Science, Technology and Medicine, Department of Mechanical Engineering, London (GB);THEODOSSOPOULOS P, Imperial College of Science, Technology and Medicine, Department of Mechanical Engineering, London (GB)
Bibliographic Reference: Paper presented: IMechE Conference on Combustion, London (GB), December 1-3, 1992
Availability: Available from (1) as Paper EN 37173 ORA
Record Number: 199211350 / Last updated on: 1994-11-29
Category: PUBLICATION
Original language: en
Available languages: en