The role of a split injection strategy in the mixture formation and combustion of diesel spray:: A large-eddy simulation

Ahmad Hadadpour; Mehdi Jangi; Kar Mun Pang; Xue Song Bai

doi:10.1016/j.proci.2018.09.016

The role of a split injection strategy in the mixture formation and combustion of diesel spray: A large-eddy simulation

Ahmad Hadadpour, Mehdi Jangi, Kar Mun Pang, Xue Song Bai

Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

202 Downloads (Pure)

Abstract

The role of a split injection in the mixture formation and combustion characteristics of a diesel spray in an engine like condition is investigated. We use large-eddy simulations with finite rate chemistry in order to identify the main controlling mechanism that can potentially improve the mixture quality and reduces the combustion emissions. It is shown that the primary effect of the split injection is the reduction of the mass of the fuel-rich region where soot
precursors can form.
Furthermore, we investigate the interaction between different injections and explain the effects of the first injection on the mixing and combustion of the second injection. Results show that the penetration of the second injection is
faster than that of the first injection. More importantly, it is shown that the ignition delay time of the second injection is much shorter than that of the first injection. This is due to the residual effects of the ignition of the first injection
which increases the local temperature and maintains a certain level of combustion some intermediates or radical which in turn boosts the ignition of the second injection.

Original language	English
Pages (from-to)	4709-4716
Journal	Proceedings of the Combustion Institute
Volume	37
Issue number	4
Early online date	6 Nov 2018
DOIs	https://doi.org/10.1016/j.proci.2018.09.016
Publication status	E-pub ahead of print - 6 Nov 2018
Event	37th International Symposium on Combustion - The Convention Centre, Dublin, Ireland Duration: 29 Jul 2018 → 3 Aug 2018

Keywords

Split injection
Jet-jet interaction
Mixture formation
Large-eddy simulation

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Hadadpour_et_al_The_role_of_a_split_injection_Proceedings_of_the_Combustion_Institute_2018Accepted author manuscript, 678 KBLicence: Creative Commons: Attribution-NonCommercial-NoDerivs (CC BY-NC-ND)

https://www.sciencedirect.com/science/article/pii/S1540748918306217Licence: None: All rights reserved

Cite this

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title = "The role of a split injection strategy in the mixture formation and combustion of diesel spray:: A large-eddy simulation ",

abstract = "The role of a split injection in the mixture formation and combustion characteristics of a diesel spray in an engine like condition is investigated. We use large-eddy simulations with finite rate chemistry in order to identify the main controlling mechanism that can potentially improve the mixture quality and reduces the combustion emissions. It is shown that the primary effect of the split injection is the reduction of the mass of the fuel-rich region where sootprecursors can form.Furthermore, we investigate the interaction between different injections and explain the effects of the first injection on the mixing and combustion of the second injection. Results show that the penetration of the second injection isfaster than that of the first injection. More importantly, it is shown that the ignition delay time of the second injection is much shorter than that of the first injection. This is due to the residual effects of the ignition of the first injectionwhich increases the local temperature and maintains a certain level of combustion some intermediates or radical which in turn boosts the ignition of the second injection.",

keywords = "Split injection, Jet-jet interaction, Mixture formation, Large-eddy simulation",

author = "Ahmad Hadadpour and Mehdi Jangi and Pang, {Kar Mun} and Bai, {Xue Song}",

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T2 - 37th International Symposium on Combustion

AU - Hadadpour, Ahmad

AU - Jangi, Mehdi

AU - Pang, Kar Mun

AU - Bai, Xue Song

PY - 2018/11/6

Y1 - 2018/11/6

N2 - The role of a split injection in the mixture formation and combustion characteristics of a diesel spray in an engine like condition is investigated. We use large-eddy simulations with finite rate chemistry in order to identify the main controlling mechanism that can potentially improve the mixture quality and reduces the combustion emissions. It is shown that the primary effect of the split injection is the reduction of the mass of the fuel-rich region where sootprecursors can form.Furthermore, we investigate the interaction between different injections and explain the effects of the first injection on the mixing and combustion of the second injection. Results show that the penetration of the second injection isfaster than that of the first injection. More importantly, it is shown that the ignition delay time of the second injection is much shorter than that of the first injection. This is due to the residual effects of the ignition of the first injectionwhich increases the local temperature and maintains a certain level of combustion some intermediates or radical which in turn boosts the ignition of the second injection.

AB - The role of a split injection in the mixture formation and combustion characteristics of a diesel spray in an engine like condition is investigated. We use large-eddy simulations with finite rate chemistry in order to identify the main controlling mechanism that can potentially improve the mixture quality and reduces the combustion emissions. It is shown that the primary effect of the split injection is the reduction of the mass of the fuel-rich region where sootprecursors can form.Furthermore, we investigate the interaction between different injections and explain the effects of the first injection on the mixing and combustion of the second injection. Results show that the penetration of the second injection isfaster than that of the first injection. More importantly, it is shown that the ignition delay time of the second injection is much shorter than that of the first injection. This is due to the residual effects of the ignition of the first injectionwhich increases the local temperature and maintains a certain level of combustion some intermediates or radical which in turn boosts the ignition of the second injection.

KW - Split injection

KW - Jet-jet interaction

KW - Mixture formation

KW - Large-eddy simulation

U2 - 10.1016/j.proci.2018.09.016

DO - 10.1016/j.proci.2018.09.016

M3 - Article

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VL - 37

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JO - Proceedings of the Combustion Institute

JF - Proceedings of the Combustion Institute

IS - 4

Y2 - 29 July 2018 through 3 August 2018

ER -

The role of a split injection strategy in the mixture formation and combustion of diesel spray: A large-eddy simulation

Abstract

Keywords

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