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Propulsive jet influence on generic launcher base flow

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Abstract

Afterbody flow phenomena represent a significant source of uncertainties in the design of a launcher. Therefore, there is a demand for measuring such flows in wind tunnels. For propulsive jet simulation a new jet facility was integrated into a hypersonic/supersonic wind tunnel. The jet simulation resembles the generic model of a staged rocket launcher. The design and the qualification of the facility are reported. This includes measurements of pressure, temperature and Mach number distribution. Pressure and Schlieren measurements are conducted in the wake of the generic launcher. The unsteady pressure characteristics at the generic rocket base and fairing are analyzed for supersonic and hypersonic freestream. The influence of the under-expanded jet is reported and the jet temperatures are varied. On the base fluctuations at a Strouhal number around 0.25 dominates supersonic freestream flows. Additionally, a fluctuation level increase on the base is observed for Strouhal numbers above 0.75 in hypersonic flow regime, which is attributed to the interactions of wake flow and jet.

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Acknowledgments

The work was funded by the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) within the framework Sonderforschungsbereich Transregio 40 (Technological foundations for the design of thermally and mechanically highly loaded components of future space transporting systems). The authors thank R. Müller-Eigner (Hyperschall Technologie Goettingen GmbH, HTG, Katlenburg-Lindau) for the efforts in designing and manufacturing the jet simulation facility and D. Saile (German Aerospace Center, DLR, Cologne) and V. Statnikov (RWTH Aachen) for supporting the PSD analysis.

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  1. Institute of Fluid Mechanics, Technische Universität Braunschweig, Hermann-Blenk-Str. 37, 38108, Braunschweig, Germany

    S. Stephan, J. Wu & R. Radespiel

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Correspondence to S. Stephan.

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Stephan, S., Wu, J. & Radespiel, R. Propulsive jet influence on generic launcher base flow. CEAS Space J 7, 453–473 (2015). https://doi.org/10.1007/s12567-015-0098-9

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