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The Ram Accelerator in Subdetonative Propulsion Mode: Analytical and Numerical Modeling and Simulation

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Hypervelocity Launchers

Part of the book series: Shock Wave Science and Technology Reference Library ((SHOCKWAVES,volume 10))

Abstract

The present chapter highlights the different steps which lead to a better understanding of the dynamics of the flow in order to predict the performance of a ram accelerator in the thermally choked propulsive mode which operates in the sub-detonative velocity regime; i.e., below the Chapman-Jouguet (C-J) detonation speed of the propellant. A two-dimensional numerical simulation is described and the CFD results are validated against test data from a representative experiment at the University of Washington 38-mm-bore test facility. The early form of the 1D modeling based on a quasi-steady assumption of the flow and involving compressibility effects as well as a real gas equation of state is then presented. The modeling is further improved by using a real gas equation of state for the reactants to account for the compressibility effects when high initial pressures are involved. In order to further account for high acceleration rates, an unsteady modeling of the flow is then assumed. The effectiveness of an improved 1D unsteady modelling applying the CFD predicted control volume length is further demonstrated. Moreover, based on data derived from different scale facilities; i.e., the University of Washington and the French-German Research Institute (ISL), several equations of state of the combustion products are investigated. A computer code, namely TARAM, has been developed for this purpose.

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  1. PPRIME (ex LCD), UPR CNRS # 3346, ISAé-ENSMA, Rue Cl. Ader, 86960, Poitiers, France

    Pascal Bauer

  2. Det Norske Veritas, Palace House, 3 Cathedral Street, London, SE1 9DE, UK

    Tarek Bengherbia

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  1. Pascal Bauer
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  1. Karlsruhe Institute of Technology (KIT), Institute of Fluid Mechanics (ISTM), Karlsruhe, Germany

    Friedrich Seiler

  2. Department of Mechanical Engineering, Ben Gurion University of the Negev, Beer Sheva, Israel

    Ozer Igra

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Bauer, P., Bengherbia, T. (2016). The Ram Accelerator in Subdetonative Propulsion Mode: Analytical and Numerical Modeling and Simulation. In: Seiler, F., Igra, O. (eds) Hypervelocity Launchers. Shock Wave Science and Technology Reference Library, vol 10. Springer, Cham. https://doi.org/10.1007/978-3-319-26018-1_7

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