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Conditional Moment Closure modelling for dual-fuel combustion engines with pilot-assisted compression ignition

Conditional Moment Closure modelling for dual-fuel combustion engines with pilot-assisted compression ignition
Conditional Moment Closure modelling for dual-fuel combustion engines with pilot-assisted compression ignition
Dual-fuel combustion is an attractive approach for utilizing alternative fuels such as natural gas in compression-ignition internal combustion engines. In this approach, pilot injection of a more reactive fuel provides a source of ignition for the premixed natural gas/air. The overall performance combines the high efficiency of a compression-ignition engine with the relatively low emissions associated with natural gas. However the combustion phenomena occurring in dual-fuel engines present a challenge for existing turbulent combustion models because, following ignition, flame propagates through a partially-reacted and inhomogeneous mixture of the two fuels. The objective of this study is to test a new modelling approach that combines the ability of the Conditional Moment Closure (CMC) approach to describe autoignition of fuel sprays with the ability of the G-equation approach to describe the subsequent flame propagation. The effects of partially-ignited fuel on the flame propagation speed is taken into account by a new laminar flame speed model. This methodology can be used for the full range of fuel substitution from perfectly-premixed through to pure diesel operation. The hybrid modelling approach is used to simulate n-heptane pilot jet-ignited combustion of a premixed methane air charge in a rapid compression-expansion machine apparatus. The results show that the hybrid model adequately captures ignition and transition to premixed flame propagation, and the sensitivity of the predictions to the flame speed modelling and ignition criteria is explored.
Soriano, Bruno, Souza
e89a5a2f-550f-43fb-ad3d-05375c48e6a2
Richardson, Edward
a8357516-e871-40d8-8a53-de7847aa2d08
Schlatter, Stephanie
179e4f2f-c56b-4af5-86a2-9926ce08bada
Wright, Yuri
fe75a421-f76a-4d8f-b81b-30d644470fcf
Soriano, Bruno, Souza
e89a5a2f-550f-43fb-ad3d-05375c48e6a2
Richardson, Edward
a8357516-e871-40d8-8a53-de7847aa2d08
Schlatter, Stephanie
179e4f2f-c56b-4af5-86a2-9926ce08bada
Wright, Yuri
fe75a421-f76a-4d8f-b81b-30d644470fcf

Soriano, Bruno, Souza, Richardson, Edward, Schlatter, Stephanie and Wright, Yuri (2017) Conditional Moment Closure modelling for dual-fuel combustion engines with pilot-assisted compression ignition. SAE 2017 Powertrains, Fuels and Lubricants, , Beijing, China. 16 - 18 Oct 2017. 10 pp . (doi:10.4271/2017-01-2188).

Record type: Conference or Workshop Item (Paper)

Abstract

Dual-fuel combustion is an attractive approach for utilizing alternative fuels such as natural gas in compression-ignition internal combustion engines. In this approach, pilot injection of a more reactive fuel provides a source of ignition for the premixed natural gas/air. The overall performance combines the high efficiency of a compression-ignition engine with the relatively low emissions associated with natural gas. However the combustion phenomena occurring in dual-fuel engines present a challenge for existing turbulent combustion models because, following ignition, flame propagates through a partially-reacted and inhomogeneous mixture of the two fuels. The objective of this study is to test a new modelling approach that combines the ability of the Conditional Moment Closure (CMC) approach to describe autoignition of fuel sprays with the ability of the G-equation approach to describe the subsequent flame propagation. The effects of partially-ignited fuel on the flame propagation speed is taken into account by a new laminar flame speed model. This methodology can be used for the full range of fuel substitution from perfectly-premixed through to pure diesel operation. The hybrid modelling approach is used to simulate n-heptane pilot jet-ignited combustion of a premixed methane air charge in a rapid compression-expansion machine apparatus. The results show that the hybrid model adequately captures ignition and transition to premixed flame propagation, and the sensitivity of the predictions to the flame speed modelling and ignition criteria is explored.

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More information

Submitted date: 2017
Accepted/In Press date: 30 May 2017
e-pub ahead of print date: 8 October 2017
Published date: 8 October 2017
Venue - Dates: SAE 2017 Powertrains, Fuels and Lubricants, , Beijing, China, 2017-10-16 - 2017-10-18
Organisations: Aerodynamics & Flight Mechanics Group, Education Hub

Identifiers

Local EPrints ID: 410101
URI: http://eprints.soton.ac.uk/id/eprint/410101
PURE UUID: f717b40d-6bd3-462f-bc74-d6e0f422bab2
ORCID for Edward Richardson: ORCID iD orcid.org/0000-0002-7631-0377

Catalogue record

Date deposited: 03 Jun 2017 04:02
Last modified: 28 Apr 2022 02:04

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Contributors

Author: Bruno, Souza Soriano
Author: Stephanie Schlatter
Author: Yuri Wright

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