Abstract
Accurate prediction of the performance characteristics of lifting surfaces at high-lift conditions requires a complete understanding of the transition characteristics. In recent flight experiments, data were gathered to provide some insight into these transition characteristics. The flow mechanisms that caused transition include growth of crossflow and Tollmien-Schlichting instabilities, laminar separation, attachment-line contamination and turbulent flow contamination by upstream elements. In addition, reversion from turbulent to laminar flow was detected in areas encountering strong favorable pressure gradients. The purpose of this paper is to provide more insight into these flight measured boundary-layer state changes by statistically analyzing the signals of the hot-film sensors in pertinent regions on the slat and main element.
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