Author : National Aeronautics and Space Administration (NASA)
Release : 2018-07-06
Genre :
Kind : eBook
Book Rating : 402/5 ( reviews)

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Book Synopsis Flowfield Dynamics in Blunt Fin-Induced Shock Wave/Turbulent Boundary Layer Interactions by : National Aeronautics and Space Administration (NASA)

Download or read book Flowfield Dynamics in Blunt Fin-Induced Shock Wave/Turbulent Boundary Layer Interactions written by National Aeronautics and Space Administration (NASA). This book was released on 2018-07-06. Available in PDF, EPUB and Kindle. Book excerpt: Fluctuating wall pressure measurements have been made on centerline upstream of a blunt fin in a Mach 5 turbulent boundary layer. By examining the ensemble averaged wall pressure distributions for different separation shock foot positions, it has been shown that local fluctuating wall pressure measurements are due to a distinct pressure distribution, Rho(sub i), which undergoes a stretching and flattening effect as its upstream boundary translates aperiodically between the upstream influence and separation lines. The locations of the maxima and minima in the wall pressure standard deviation can be accurately predicted using this distribution, providing quantitative confirmation of the model. This model also explains the observed cross-correlations and ensemble average measurements within the interaction. Using the Rho(sub i) model, wall pressure signals from under the separated flow region were used to reproduce the position-time history of the separation shock foot. Further, the negative time delay peak in the cross-correlation between the predicted and actual shock foot histories suggests that the separated region fluctuations precede shock foot motion. The unsteady behavior of the primary horseshoe vortex and its relation to the unsteady separation shock are described. Dolling, David S. and Brusniak, Leon Unspecified Center...