Lean burn limit and time to light characteristics of laser ignition in gas turbines

J. Griffiths, M. Riley, A. Kirk, A. Borman, J. Lawrence, C. Dowding

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

This work details a study of laser ignition in a low pressure combustion test rig, representative of an industrial gas turbine (SGT-400, Siemens Industrial Turbomachinery Ltd.) and for the first time investigates the effect of air mass flow rate on combustion characteristics at air/fuel ratios at the lean burn limit. Both the lean burn limit and time taken to light are essential in determining the suitability of a specified air/fuel ratio, especially in multi-chamber ignition applications. Through extension of the lean burn limit and reduction of the time taken to light, the operating window for ignition with regards to the air/fuel ratio can be increased, leading to greater reliability and repeatability of ignition. Ignition of a natural gas and air mixture at atmospheric pressure was conducted using both a standard high energy igniter and a laser ignition system utilizing a Q-switched Nd:YAG laser source operating at 1064 nm wavelength. A detailed comparison of the lean burn limit and time taken to light for standard ignition and laser ignition is presented.

Original languageEnglish
Pages (from-to)262-266
Number of pages5
JournalOptics and Lasers in Engineering
Volume55
DOIs
Publication statusPublished - Apr 2014
Externally publishedYes

Keywords

  • Air/fuel ratio
  • Gas turbine
  • Laser ignition
  • Lean burn limit
  • Time to light

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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