Wave combustors for trans-atmospheric vehicles

Menees, Gene P.; Adelman, Henry G.; Cambier, Jean-Luc; Bowles, Jeffrey V.

doi:10.2514/3.23536

Cited by 50 publications

(12 citation statements)

References 5 publications

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“…1 In recent years, oblique detonation as an alternative for supersonic combustion has gained significant interest for air-breathing, hypersonic propulsion systems because of its potential to offer greater efficiency. [2][3][4] This combustion mode has led to the development of Oblique Detonation Wave (ODW) engines and ram accelerators. 5 After several decades of research, however, there remain challenges to stabilize a steady oblique detonation in high-speed, combustible mixtures.…”

Section: Introductionmentioning

confidence: 99%

Initiation structure of oblique detonation waves behind conical shocks

Yang

Teng

et al. 2017

Physics of Fluids

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The understanding of oblique detonation dynamics has both inherent basic research value for highspeed compressible reacting flow and propulsion application in hypersonic aerospace systems. In this study, the oblique detonation structures formed by semi-infinite cones are investigated numerically by solving the unsteady, two-dimensional axisymmetric Euler equations with a one-step irreversible Arrhenius reaction model. The present simulation results show that a novel wave structure, featured by two distinct points where there is close-coupling between the shock and combustion front, is depicted when either the cone angle or incident Mach number is reduced. This structure is analyzed by examining the variation of the reaction length scale and comparing the flow field with that of planar, wedge-induced oblique detonations. Further simulations are performed to study the effects of chemical length scale and activation energy, which are both found to influence the formation of this novel structure. The initiation mechanism behind the conical shock is discussed to investigate the interplay between the effect of the Taylor-Maccoll flow, front curvature, and energy releases from the chemical reaction in conical oblique detonations. The observed flow fields are interpreted by means of the energetic limit as in the critical regime for initiation of detonation.

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Section: Introductionmentioning

confidence: 99%

Initiation structure of oblique detonation waves behind conical shocks

Yang

Teng

et al. 2017

Physics of Fluids

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“…Therefore the oblique detonation propulsion attracts much attention for its potential application in the hypersonic. In the early research, oblique detonation waves are usually simplified to be the oblique shock waves and post shock release zones attached on the wedge [4]. However, this assumption ignores the realistic structure near the wedge front tip, which may be problematic.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on the induction zone structure of the oblique detonation waves

2014

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a b s t r a c tOblique detonation waves are simulated to study the induction zone structures with different incident Ma numbers. Three kinds of shock configurations are observed at the end of the induction zone, which are the k-shaped shock, the X-shaped shock and the Y-shaped shock. The X-shaped and Y-shaped shocks appear when the incident Ma is low, and the Y-shaped shock associated with the complicated unstationary process. The induction zone length reaches the maximum value when the X-shaped shock changes into the Y-shaped shock, which indicates different mechanisms deciding the induction zone. The oblique shock wave dominates the induction zone when the incident Ma is high, while the oblique detonation wave dominates the induction zone when the incident Ma is low.

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“…2 can be found in the literature as far back as 1963 (Gross 1963). Many recent examples of this type of figure are also found in the literature, since it is basic to ram accelerators (Hertzberg et al 1991;Yungster et al 1991), oblique detonation wave engines (Menees et al 1992;Ostrander et al 1987), and detonation wave theory in Correspondence to: G. Emanuel general Powers and Stewart 1992;Powers and Gonthier 1992;Buckmaster and Lee 1990;Lasseigne and Hussaini 1993). Buckmaster and Lee (1990) point out that a weak underdriven wave violates the second law of thermodynamics.…”

Section: Introductionmentioning

confidence: 96%

Wave angle for oblique detonation waves

Ashford

Emanuel

1994

Shock Waves

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Abstract.The flow field associated with a steady, planar, oblique detonation wave is discussed. A revision is provided for/3-0 diagrams, where/3 is the wave angle and 0 is the ramp angle. A new solution is proposed for weak underdriven detonation waves that does not violate the second law. A Taylor wave, encountered in unsteady detonation waves, is required. Uniqueness and hysteresis effects are also discussed.

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Wave combustors for trans-atmospheric vehicles

Cited by 50 publications

References 5 publications

Initiation structure of oblique detonation waves behind conical shocks

Initiation structure of oblique detonation waves behind conical shocks

Numerical investigation on the induction zone structure of the oblique detonation waves

Wave angle for oblique detonation waves

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