Effect of flow velocity and temperature on minimum ignition energy in laser-induced spark ignition of gaseous fuels

Griffiths, Jonathan David, Riley, Mike, Borman, Alexander, Dowding, Colin, Kirk, Antony and Bickerton, Ronald (2014) Effect of flow velocity and temperature on minimum ignition energy in laser-induced spark ignition of gaseous fuels. In: 1st International Symposium on Energy Challenges and Mechanics, 8-10 July, 2014, Aberdeen.

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Item Type:Conference or Workshop contribution (Paper)
Item Status:Live Archive

Abstract

Laser induced spark ignition offers the potential for greater reliability and consistency in ignition of lean air/fuel mixtures. This increased reliability is essential for the application of gas turbines as primary or secondary reserve energy sources in smart grid systems, enabling the integration of renewable energy sources whose output is prone to fluctuation over time. This work details a study into the effect of flow velocity and temperature on minimum ignition energies in laser-induced spark ignition in an atmospheric combustion test rig, representative of a sub 15 MW industrial gas turbine (Siemens Industrial Turbomachinery Ltd., Lincoln UK). Determination of the minimum ignition energies required for a range of temperatures and flow velocities is essential in determining an operating window in which laser-induced spark ignition can operate under realistic, engine-like start conditions. Ignition of a natural gas and air mixture at atmospheric pressure was conducted using a laser ignition system utilizing a Q-switched Nd:YAG laser source operating at 532 nm wavelength and 4 ns pulse length. A detailed analysis of the potential for extension of this operating window, for instance through an improvement in the lean burn limit, is presented.

Keywords:Laser ignition, Air/fuel ratio, Minimum ignition energy, Gas turbine
Subjects:H Engineering > H221 Energy Resources
Divisions:College of Science > School of Engineering
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ID Code:14345
Deposited On:18 Jun 2014 12:52

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