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

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.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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