Theoretical and Experimental Investigations on Ariane 5 Baseflow Buffeting

Details Theoretical and Experimental Investigations on Ariane 5 Baseflow Buffeting Theoretical and Experimental Investigations on Ariane 5 Baseflow Buffeting

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.563..339w&link_type=abstract

Proceedings of the Fifth European Symposium on Aerothermodynamics for Space Vehicles (ESA SP-563). 8-11 November 2004, Cologne,

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A summary of some of the theoretical and experimental investigations of base-flow buffeting on Ariane 5 is described in this paper. The source and the mechanism of buffeting in the base flow, including its instability coupling with the local acoustic resonance, are identified and explained. A model for the Ariane 5 base-flow buffeting is presented. Detailed comparison between available experimental data and semi-empirical predictions on the Ariane 5 side-load resonant frequencies and amplitudes are highlighted. The main objective is to design a configuration for the Ariane 5 base to have the base-flow buffeting on the Vulcain engine nozzle at least reduced, if not avoided. NOMENCLATURE w = angular frequency L = length scale of cavity D = mean depth of cavity U = free-stream velocity M• = free-stream Mach number m = mode of instability CSU,CUS = scattering coefficients at the upstream and downstream ends of cavity Re[a] = ratio of free-stream velocity and convective velocity of vortices Re[to + ] = ratio of free-stream velocity and phase speed of upstream-propagating cavity mode of order zero f = frequency X = downstream distance Ret = turbulence Reynolds number f = azimuthal angle

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