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

Griffiths, Jonathan David, Riley, Mike, Kirk, Antony , Borman, Alexander, Lawrence, Jonathan and Dowding, Colin (2014) Lean burn limit and time to light characteristics of laser ignition in gas turbines. Optics and Lasers in Engineering, 55 . pp. 262-266. ISSN 0143-8166

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Item Type:Article
Item Status:Live Archive


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.Boththeleanburnlimitandtimetakentolightareessentialindeterminingthesuitabilityof
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.

Keywords:Laser ignition, Gas turbine, Time to light, Lean burnlimit, Air/fuel ratio, NotOAChecked
Subjects:F Physical Sciences > F311 Engineering Physics
Divisions:College of Science > School of Engineering
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ID Code:12746
Deposited On:18 Dec 2013 17:41

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