Change of regime in supersonic flow past an obstacle preceded by a thin channel of reduced density

Artem'ev, V. I.; Bergelson, Vitaly; Nemchinov, I. V.; Орлова, Т. И.; Смирнов, В. А.; Khazins, V. M.

doi:10.1007/bf01051734

Cited by 25 publications

(18 citation statements)

References 1 publication

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“…The conditions of some already conducted experiments were very close to those required. Severe distortions of the shape of bow shock waves are clearly seen on the photographs obtained in ballistic experiments with freon (Baryshnikov et al 1979 Shock-tube experiments with a cylindrical body in propane (γ ≈ 1.08) were made by Artem'ev et al (1989). The thermal layer was created at the surface of a thin heated molybdenum needle which was firmly connected to the body.…”

Section: Discussionmentioning

confidence: 99%

Vortical regime of the flow behind the bow shock wave

Svetsov

2001

Shock Waves

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A new nonstationary regime of the flow around a step and a cylinder was found to exist at high free-stream Mach numbers for gas specific heat ratios below 1.2. The main features of the flow are strong vortices in the shock-compressed region with supersonic reversal velocities at the body face. The bow shock wave takes on a complicated shape, fluctuating in time. The vortical regimes can result from local heterogeneities in the free stream. The case of the heterogeneity is studied in this paper in the form of a thin thermal layer of limited length. The vortical regime remains in existence after the source of disturbances is removed. The results have been obtained through computer simulations through the use of Eulerian hydrodynamic equations and by way of several numerical methods: FLIC, Godunov's scheme, TVD, and PPM. The influence of viscosity on the development of the vortical regime has been studied by computer solving the Navier-Stokes equations.

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Section: Discussionmentioning

confidence: 99%

Vortical regime of the flow behind the bow shock wave

Svetsov

2001

Shock Waves

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“…Artem'ev et al (1989a;1989b;1990) indicated that similar effects are obtainable by the action of a thin solid spike which would disturb the local density in front of the bow shock ("hot spike"). Once the channel of reduced density has been formed per pendicular to the body surface or slightly inclined, then under certain conditions (Artem'ev et al 1987;Bergel'son et al 1987;Mirels 1988) a conical precursor oriented along the channel will appear and propagate ahead of the shock wave.…”

Section: Introductionmentioning

confidence: 92%

“…We point out a feature of another flow by means of the similar scheme using numerical and experimental results (Artem'ev et al 1989a;1989b;1990). These results are obtained when analyzing the supersonic flow over a blunt cylinder which has a thin rarefied channel in its front surface localized along the upstream extension of its symmetry axis.…”

Section: General Characteristics Of the Phenomenonmentioning

confidence: 98%

Rearrangement of the bow shock shape using a ?hot spike?

et al. 1994

Self Cite

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Abstract.A method of possible diagnostics of supersonic flows around a blunt body and its aerodynamic characteristics by means of a thin channel of reduced density emerging in front of the bow shock wave is discussed. The channel was placed parallel to the body axis or inclined to it. Under the conditions of initially uniform pressure the temperature in the channel ("the hot spike") is higher than that of the environment. A thin hot spike, which as its limit is infinitely thin, results in the formation of a precursory disturbance in front of the bow shock wave. The length of the precursor is comparable with the characteristic length, that is, the cross section of the blunt body. The hot spike when localized parallel to the body axis and not in line with it yields turning and deviating moments, a lift force was generated even for a symmetric blunt body. Possible applications of this effect are, for example, a change of the trajectory of a small asteroid by means of using the hot spike.

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“…The concepts range from energizing the air in front of the blunt body due to laser heating (see, e. g., [810]), DC-Arc discharge (see, e. g., [11]), or with a wire pointing upstream and heated electrically [12]. Also, the upstream injection of a jet originating from the nose tip showed promising results.…”

Section: Introductionmentioning

confidence: 99%

Wave drag reduction due to a self-aligning aerodisk

Schnepf

Wysocki

Schülein

2015

Progress in Flight Physics – Volume 7

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The e¨ect of a self-aligning aerodisk on the wave drag of a blunt slender body in a pitching maneuver has been numerically investigated. The self-alignment was realized by a coupling of the §ow solver and a §ight mechanics tool. The slender body was pitched with high repetition rate between α = 0• and 20• at M = 1.41. Even at high α, the concept could align the aerodisk to the oncoming §ow. In comparison to the reference body without a self-aligning aerodisk, a distinct drag reduction is achieved. A comparison with existing experimental data shows a qualitatively good agreement considering the shock and separation structure and the kinematics of the aerodisk.

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Change of regime in supersonic flow past an obstacle preceded by a thin channel of reduced density

Cited by 25 publications

References 1 publication

Vortical regime of the flow behind the bow shock wave

Vortical regime of the flow behind the bow shock wave

Rearrangement of the bow shock shape using a ?hot spike?

Wave drag reduction due to a self-aligning aerodisk

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