Accession Number:

AD0274761

Title:

ON THE EXISTENCE OF CROSS FLOWS IN SEPARATED SUPERSONIC STREAMS

Descriptive Note:

Corporate Author:

CENTRE NATIONAL D'ETUDES ET DE RECHERCHES AERONAUTIQUES BRUSSELS (BELGIUM)

Personal Author(s):

Report Date:

1962-02-01

Pagination or Media Count:

1.0

Abstract:

An experimental investigation was made on laminar separated supersonic streams using two-dimensional backward-facing step models. It was shown that a cross-flow existed in the separated region of the flow which is associated with the side wall boundary-layers. Its effect is to decrease the base pressure and increase the pressure gradient at reattachment even for large values of the model-span to step-height ratio. It is shown that the commonly accepted assumption that a twodimensional flow exists when there is no measurable spanwise pressure variation is a necessary but not sufficient condition. In the turbulent case, it is generally found that the measured base pressure is lower than is theoretically predicted. This is explained by the existence of a cross-flow suction produced by strong vertical vortices near the side walls. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE