Measurement of quenching layer thickness by flame ion output distribution.

概要

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Although quenching on a wall of a combustion chamber has been studied by several investigators, direct measurements of flame structure near the wall are scarcely approached. In this paper, local ion output distributions near the wall are directly measured to reveal the flame structure, and a measurement system of quenching layer thickness by means of the ion output distributions is proposed.<BR>The ion output measured decreases as a ionization probe approaches the wall, and is assumed to become zero on the wall finally. Apparent quenching layer thickness by measuring ion output distributions is obtained by a similar application to displacement thickness in the boundary layer theory of fluid dynamics. The apparent quenching layer thickness is defined as a distance at which the wall shifts to the flame apparently without ion output distributions near the wall.<BR>In consequence, the followings are elucidated; ion output of the flame near the wall is influenced by formation of a quenching layer, and tendencies of the quenching layer thickness obtained by an ionization probe agrees well with that measured by a flanged electrode method.
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