High-Sensitivity In-Situ Soot Particle Sensing in an Aero-Engine Exhaust Plume Using Long-Pulsed Fiber-Laser Induced Incandescence

David Mccormick, J.D. Black, Y. Feng, J. Nilsson, K.B. Ozanyan

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    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 Laser-Induced 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 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 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 work is the first step towards the development of a non-intrusive system for measurement of 2-D soot concentration in the cross-section of an aero-engine exhaust plume.

    Original languageEnglish
    Pages (from-to)2674-2682
    Number of pages9
    JournalIEEE Sensors Journal
    Volume16
    Issue number8
    DOIs
    Publication statusPublished - 2015

    Keywords

    • aero-engine
    • fiber-laser
    • exhaust plume
    • laser induced incandescence
    • soot sensing
    • ambient sensing

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