High-sensitivity in situ soot particle sensing in an aero-engine exhaust plume using long-pulsed fiber-laser-induced incandescence

McCormick, David, Black, John D., Feng, Yutong, Nilsson, Johan and Ozanyan, Krikor B. (2016) High-sensitivity in situ soot particle sensing in an aero-engine exhaust plume using long-pulsed fiber-laser-induced incandescence. IEEE Sensors Journal, 16 (8), 2674-2682. (doi:10.1109/JSEN.2015.2507702).

Abstract

A method to produce spatially resolved images of the distribution of absorbing particles in the exhaust plume of a modified helicopter gas turbine engine is presented. Over a small region of the plume, in situ sensing of soot particles by laserinduced incandescence (LII) is demonstrated using fiber lasers with higher power (~10 W), longer pulse duration (>100 ns), and higher pulse repetition rates (>10 kHz) than the conventional LII. The sensitivity of the method is illustrated by the detection of ambient absorbing particles in background conditions with engine at rest. With a running engine, single-beam images are obtained in 0.01 s. The feasibility of using long-pulsed fiber lasers for soot particle concentration measurement is investigated using a representative laboratory system. The time-resolved LII behavior and the measurement linearity are investigated, demonstrating the suitability of using fiber lasers for soot particle measurement for aero-engine emissions. Results for normalized soot concentration are compared with extractive measurements illustrating good correlation across a range of engine speeds. This paper is the first step toward the development of a non-intrusive system for the measurement of 2-D soot concentration in the cross section of an aero-engine exhaust plume.

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Contributors

Author: Yutong Feng

Author: Johan Nilsson

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