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Numerical study on the effect of injection pressure on high-pressure diesel spray

Ong, YL, Salehi, F, Ghiji, M and Garaniya, V ORCID: 0000-0002-0090-147X 2020 , 'Numerical study on the effect of injection pressure on high-pressure diesel spray' , Combustion Theory and Modelling , doi: 10.1080/13647830.2020.1851397.

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Abstract

This paper analyses the effect of injection pressures on spray and flame structures underhigh-pressure diesel spray conditions using a three-dimensional Reynolds-AverageNavier-Stokes (RANS) model. The simulations are conducted using three kinetic mechanisms known as Luo (106 species), Cai (57 species) and Yao (54 species). Tabulationand Dynamic Adaptive Chemistry (TDAC) solver is adopted to reduce the computational cost. The reacting results obtained using the Luo kinetic mechanism demonstratethe best agreement with the experiment. The Cai and Yao chemistry models overpredictand underpredict the ignition delay time respectively, whereas both mechanisms overpredict the flame lift-off length, particularly at higher injection pressures. It is foundthat the error for the ignition delay time is larger at higher injection pressures while theopposite is true for the flame lift-off length. The results reveal that at lower injectionrates, the cool flame, represented by the CH2O, occurs at richer mixture closer to thenozzle. On the other hand, the heat release rate is lower while the CO emission is higher.Detailed analysis on scalar fields shows that the Cai and Yao mechanisms lead to moreconsistent results in capturing the temperature field in terms of high-temperature reaction zone while Yao and Luo mechanisms result in a more consistent trend in producingthe C2H2 species.

Item Type: Article
Authors/Creators:Ong, YL and Salehi, F and Ghiji, M and Garaniya, V
Keywords: high-pressure spray, TDAC, chemistry model, combustion, RANS
Journal or Publication Title: Combustion Theory and Modelling
Publisher: Iop Publishing Ltd
ISSN: 1364-7830
DOI / ID Number: 10.1080/13647830.2020.1851397
Copyright Information:

Copyright 2020 Informa UK Limited, trading as Taylor & Francis Group

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