Dense gas phenomena in a free-piston hypersonic wind tunnel

Enkenhus, K. R.; Parazzoli, C. G.

doi:10.2514/3.5606

Cited by 6 publications

(1 citation statement)

References 2 publications

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“…dense-gas, effects must be considered include the design of subcritical and supercritical power cycles (Reynolds &Perkins 1977 andHawkins 1986) and chemical and fuel transport (Leung &Epstein 1988 andBober &Chow 1990). Further examples include the design of hypersonic and transonic wind tunnels as described by Enkenhus & Parazzoli (1970), Wagner & Schmidt (1978), Simeonides (1987Simeonides ( , 1990, Anderson (1991a, b), and Anders (1993). Dziedzic et al (1993) described the use of supercritical hydrogen to cool hypersonic aircraft.…”

Section: Introductionmentioning

confidence: 99%

On the suppression of shock-induced separation in Bethe–Zel'dovich–Thompson fluids

Cramer

Park

1999

J. Fluid Mech.

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We consider the reflection of oblique compression waves from a two-dimensional, steady, laminar boundary layer on a flat, adiabatic plate at free-stream pressures such that dense-gas effects are non-negligible. The full Navier-Stokes equations are solved through use of a dense-gas version of the Beam-Warming implicit scheme. The main fluids studied are Bethe-Zel'dovich-Thompson (BZT) fluids. These are ordinary gases which have specific heats large enough to cause the fundamental derivative of gasdynamics to be negative for a range of pressures and temperatures in the singlephase vapour regime. It is demonstrated that the unique dynamics of BZT fluids can result in a suppression of shock-induced separation. Numerical tests performed reveal that the physical mechanism leading to this suppression is directly related to the disintegration of any compression discontinuities originating in the flow. We also demonstrate numerically that the interaction of expansion shocks with the boundary layer produces no adverse effects.

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