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Studies of the combustion process with simultaneous formaldehyde and OHPLIF in a direct-injected HCCI engine

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Author

Summary, in English

This paper presents simultaneous laser based measurements of formaldehyde and OH-radical distributions in a 0.5 liter optical HCCI engine with direct injection. Formaldehyde is formed as an intermediate species when combusting hydrocarbons. The formation occurs through low temperature reactions in an early phase of the combustion process. Later in the process formaldehyde is being consumed. Formaldehyde is, therefore, used as indicator of the first stage of combustion and a marker of zones with low-lemperature reactions. The OH radical is formed as an intermediate during the high temperature reactions, and is used as a marker of zones where the combustion is ongoing. The purpose of the investigation was to study how the combustion process is affected by the change in homogeneity that arises from early and late injection, respectively. The measurement technique used was planar laser-induced fluorescence where formaldehyde was excited at 355 nm and OH at 283 nm.

Publishing year

2005

Language

English

Pages

701-707

Publication/Series

JSME International Journal. Series B: Fluids and Thermal Engineering

Volume

48

Issue

4

Document type

Journal article

Publisher

Japan Society of Mechanical Engineers

Topic

  • Atom and Molecular Physics and Optics
  • Other Mechanical Engineering

Keywords

  • OH
  • formaldehyde
  • HCCI
  • direct-injection
  • PLIF

Status

Published

ISBN/ISSN/Other

  • ISSN: 1340-8054