To address the need for monitoring soot emanating from aircraft engines, a measurement system employing laserinduced incandescence (LII) has been developed and was successfully tested.* The † instrument ‡ instantaneously § images* * up † † to a 1-m chord of an exhaust plume with a spatial resolution of 5.1 cm, and is capable of providing measurements of soot concentration down to 0.02 mg/m 3. The system is completely non-intrusive and thus can be used to complement extractive sampling methods. Our efforts show how the LII method has matured to a level where it is ready for the harsh environment of an engine test cell. This paper describes the design and implementation of an LII system for soot concentration measurements in a full-scale, ground-based engine test, and presents results from such a test.

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To address the need for measuring soot flux from aircraft engines, a system employing laser-induced incandescence (LII) has been developed for measuring soot concentration and velocity, with the potential for measuring particle size.* The † instrument ‡ instantaneously § images* * up † † to a 1-m chord of an exhaust plume with a spatial resolution of 5.1 cm, and is capable of providing measurements of soot concentration down to 5 µg/m 3. Quantitative non-intrusive measurements of soot concentration in the exhaust of a full-scale aircraft engine have been demonstrated using this system, and are presented here. The system enables rapid measurements, taking a data point every 0.1 seconds. Results are also presented from laboratory experiments with this system demonstrating velocity measurement and the potential for particle sizing. Measurements using this system should help to improve the monitoring of soot emissions from aircraft engines.

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