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Attachment-Line Transition and Boundary-Layer Relaminarization on a High-Lift Wing in Flight
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Abstract
Flight experiments were conducted on an instrumented NASA-Langley 737-100 aircraft to investigate high-lift flow physics and to correlate and validate computational and wind-tunnel measurements. The possible reversion of turbulent attachment-line flow present at flight Reynolds numbers to a laminar state (relaminarization), under the action of strong favorable pressure gradients, has a potentially significant impact on the prediction of high-lift system performance from wind-tunnel tests and computational analyses. Boundary-layer state measurements, obtained in the most recent flight phase, taken around the slat and leading edge of the main element, are analyzed. Three transition processes on the slat (attachment-line transition, boundary-layer relaminarization, and subsequent retransition) are studied with and without a boundary-layer trip (trip belt) to vary attachment-line disturbance levels and to test the relaminarizing tendencies of the slat. Relaminarization still occurs in the presence of the trip belt. A separation bubble is revealed as the mode of retransition on the slat. The attachment-line Reynolds numbers at which natural and contamination-induced attachment-line transition occur in-flight are revealed. Relaminarization is also shown on the main element, indicating that relaminarization is not limited to the slat.
Authors
Citation
Roback, V., van Dam, C., Los, S., Yip, L. et al., "Attachment-Line Transition and Boundary-Layer Relaminarization on a High-Lift Wing in Flight," SAE Technical Paper 965564, 1996, https://doi.org/10.4271/965564.Also In
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