Computational studies of a superdetonative ram accelerator mode

Yungster, Shaye; Bruckner, A. P.

doi:10.2514/3.23499

Cited by 37 publications

(11 citation statements)

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“…These experiments have directly motivated further, primarily numerical studies: (Brackett and Bogdanoff, 1989), , (Yungster, et al, 1991), (Yungster and Bruckner, 1992), (Bogdanoff, 1992), Yungster (1992), and (Pepper and Brueckner, 1993). In particular, the numerical calculations of Yungster and Bruckner, 1992, predict that a ram accelerator can achieve a steady-state velocity such that a combustion-induced thrust force balances drag forces.…”

Section: Reviewmentioning

confidence: 99%

“…In particular, the numerical calculations of Yungster and Bruckner, 1992, predict that a ram accelerator can achieve a steady-state velocity such that a combustion-induced thrust force balances drag forces. This condition is achieved at a velocity near 9, 600m/s, corresponding to a Mach number near 12 for a mixture, initially at a pressure of 20.3bar and composed of 5H 2 + O 2 + 4He, flowing over an axisymmetric projectile of half angle θ = 14 deg, diameter 29mm, and overall length 190mm in a tube of diameter 38mm.…”

Section: Reviewmentioning

confidence: 99%

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Oblique Detonations: Theory and Propulsion Applications

Powers

1994

ICASE/LaRC Interdisciplinary Series in Science and Engineering

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The oblique detonation, a combustion process initiated by an oblique shock, arises in most supersonic combustion applications including, most notably, the ram accelerator and the oblique detonation wave engine. Additionally, it is the generic two-dimensional compressible shocked reacting flow; consequently, its basic research value is inherent. The outstanding theoretical questions are also the fundamental practical questions: e.g. what conditions are necessary for steady solutions, what is the dependency of the steady propagation speed on the ambient condition, what is the susceptibility of the system to instability, and what is the behavior of the system in unsteady operation. A related topic which transcends all questions is the ability to describe these phenomena computationally. At this early stage, these issues are most clearly addressed with simple models. This paper will review the application of such models to oblique detonations and discuss their future relevance.

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Section: Reviewmentioning

confidence: 99%

Section: Reviewmentioning

confidence: 99%

Oblique Detonations: Theory and Propulsion Applications

Powers

1994

ICASE/LaRC Interdisciplinary Series in Science and Engineering

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“…(1)(2)(3)(4)(5)(6) are the density ρ, the Cartesian velocity component v i , the pressure P , the temperature T , the internal energy e, and the reaction progress variable λ. The dependent variables are time t and the Cartesian position coordinate x i .…”

Section: Model Equationsmentioning

confidence: 99%

Calculations for steady propagation of a generic ram accelerator configuration using the Roe method

Grismer

Powers

1994

32nd Aerospace Sciences Meeting and Exhibit

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This study describes a methodology and gives analysis to determine the steady propagation speed of a projectile fired into a gaseous mixture of fuel and oxidizer. For tractability, the steady supersonic flow of an inviscid calorically perfect ideal reacting gas with high activation energy over a symmetric double wedge, unconfined by a cowl, is considered. Propagation speeds are found which give rise to shocks of such strength as to induce a reaction zone to be in a region which allows the combustion-induced thrust to balance the wave drag. For a fixed heat release greater than a critical value, two steady propagation speeds are predicted. The solution at the higher Mach number is stable to quasi-static perturbations while the solution at the lower Mach number is unstable. This methodology can be applied to analyze devices which have more complex geometries, such as the ram accelerator or oblique detonation wave engine.

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“…Oscillations in temperature and pressure may lead to inaccurate production and destruction of radicals. The Total Variation Diminishing (TVD) approach has been taken by several investigators [25,26,39,43,44,45,46] to try to accurately capture shock waves and reaction fronts. Yee and Shinn [40] investigated several aspects of semi-implicit and fully implicit shock-capturing methods for reacting flow.…”

Section: Introductionmentioning

confidence: 99%

“…Numerous investigators have used the point implicit approach for both steady state [8,44,45] and unsteady simulations [26,39]. Wilson and Sussman [39] combined the point implicit treatment with a formulation of the species conservation equations in logarithmic form.…”

Section: Introductionmentioning

confidence: 99%