Dr. Charles Tyler Profile

Dr. Charles Tyler

at Air Force Research Lab

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Proceedings Article | 13 October 1999 Paper

Imaging strategies for the study of gas turbine spark ignition

James Gord, Charles Tyler, Keith Grinstead, Gregory Fiechtner, Michael Cochran, John Frus

Proceedings Volume 3783, (1999) https://doi.org/10.1117/12.365756

KEYWORDS: Cameras, Ultrafast imaging, Real time imaging, Visualization, Imaging systems, CCD cameras, Pulsed laser operation, Laser sources, Fluid dynamics, Data acquisition

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Spark-ignition systems play a critical role in the performance of essentially all gas turbine engines. These devices are responsible for initiating the combustion process that sustains engine operation. Demanding applications such as cold start and high-altitude relight require continued enhancement of ignition systems. To characterize advanced ignition systems, we have developed a number of laser-based diagnostic techniques configured for ultrafast imaging of spark parameters including emission, density, temperature, and species concentration. These diagnostics have been designed to exploit an ultrafast- framing charge-coupled-device (CCD) camera and high- repetition-rate laser sources including mode-locked Ti:sapphire oscillators and regenerative amplifiers. Spontaneous-emission and laser-shlieren measurements have been accomplished with this instrumentation and the result applied to the study of a novel Unison Industries spark igniter that shows great promise for improved cold-start and high-altitude-relight capability as compared to that of igniters currently in use throughout military and commercial fleets. Phase-locked and ultrafast real-time imaging strategies are explored, and details of the imaging instrumentation, particularly the CCD camera and laser sources, are discussed.

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