The particulate emissions of an AVCO Lycoming vehicular gas turbine were measured by several techniques — two for determining smoke number and three for measurement of true smoke density. There was little agreement among the different techniques, with smoke numbers varying between 16 and 31 and true smoke density ranging from 6 to 19 milligrams per cubic meter at one engine test condition. The differences were attributed to timewise variation in engine performance, effects of different sampling techniques and the presence of volatile matter in the particulates. Particulate measurements were made during steady state and transient operation using a new instrument called a Tapered Element Oscillating Microbalance.

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