Effect of laser-induced excitation of oxygen on ignition in HCCI engines analysed by numerical simulations

D. L. Flowers; S. M. Aceves; R. W. Dibble

doi:10.1080/13647830601039169

Effect of laser-induced excitation of oxygen on ignition in HCCI engines analysed by numerical simulations

D. L. Flowers^*, S. M. Aceves, R. W. Dibble

^*Corresponding author for this work

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

2 Scopus citations

Abstract

Lack of proven means to control ignition impedes practical implementation of homogenous charge compression ignition (HCCI) engines. In the present paper, we investigate if laser-induced excitation of oxygen might aid solution of the ignition control problem in HCCI engines. Simulations by previous researchers showed laser-induced excitation of oxygen enhances ignition in supersonic combustion. Based on this previous research, we extend a chemical kinetic mechanism for propane autoignition to include reactions for two excited oxygen states, O₂(a¹Δ_g) and O₂ (b¹σ_g⁺). Simulations examined the effect of each of these excited O₂ states upon ignition timing in an HCCI engine. Results indicate that achieving useful control of the combustion process requires substantial conversion of O₂ to either of the excited states. At the required level of excitation, the power required for the laser may lower engine efficiency.

Original language	English (US)
Pages (from-to)	455-468
Number of pages	14
Journal	Combustion Theory and Modelling
Volume	11
Issue number	3
DOIs	https://doi.org/10.1080/13647830601039169
State	Published - Jun 2007
Externally published	Yes

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
Modeling and Simulation
Fuel Technology
Energy Engineering and Power Technology
General Physics and Astronomy

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10.1080/13647830601039169

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title = "Effect of laser-induced excitation of oxygen on ignition in HCCI engines analysed by numerical simulations",

abstract = "Lack of proven means to control ignition impedes practical implementation of homogenous charge compression ignition (HCCI) engines. In the present paper, we investigate if laser-induced excitation of oxygen might aid solution of the ignition control problem in HCCI engines. Simulations by previous researchers showed laser-induced excitation of oxygen enhances ignition in supersonic combustion. Based on this previous research, we extend a chemical kinetic mechanism for propane autoignition to include reactions for two excited oxygen states, O2(a1Δg) and O2 (b1σg+). Simulations examined the effect of each of these excited O2 states upon ignition timing in an HCCI engine. Results indicate that achieving useful control of the combustion process requires substantial conversion of O2 to either of the excited states. At the required level of excitation, the power required for the laser may lower engine efficiency.",

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AU - Flowers, D. L.

AU - Aceves, S. M.

AU - Dibble, R. W.

PY - 2007/6

Y1 - 2007/6

N2 - Lack of proven means to control ignition impedes practical implementation of homogenous charge compression ignition (HCCI) engines. In the present paper, we investigate if laser-induced excitation of oxygen might aid solution of the ignition control problem in HCCI engines. Simulations by previous researchers showed laser-induced excitation of oxygen enhances ignition in supersonic combustion. Based on this previous research, we extend a chemical kinetic mechanism for propane autoignition to include reactions for two excited oxygen states, O2(a1Δg) and O2 (b1σg+). Simulations examined the effect of each of these excited O2 states upon ignition timing in an HCCI engine. Results indicate that achieving useful control of the combustion process requires substantial conversion of O2 to either of the excited states. At the required level of excitation, the power required for the laser may lower engine efficiency.

AB - Lack of proven means to control ignition impedes practical implementation of homogenous charge compression ignition (HCCI) engines. In the present paper, we investigate if laser-induced excitation of oxygen might aid solution of the ignition control problem in HCCI engines. Simulations by previous researchers showed laser-induced excitation of oxygen enhances ignition in supersonic combustion. Based on this previous research, we extend a chemical kinetic mechanism for propane autoignition to include reactions for two excited oxygen states, O2(a1Δg) and O2 (b1σg+). Simulations examined the effect of each of these excited O2 states upon ignition timing in an HCCI engine. Results indicate that achieving useful control of the combustion process requires substantial conversion of O2 to either of the excited states. At the required level of excitation, the power required for the laser may lower engine efficiency.

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Effect of laser-induced excitation of oxygen on ignition in HCCI engines analysed by numerical simulations

Abstract

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