Drag of nonspherical particles in a flow behind a shock wave

Boiko, V. M.; Poplavskii, S. V.

doi:10.1007/s10573-005-0008-0

Cited by 16 publications

(36 citation statements)

References 11 publications

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“…It was shown [12][13][14] that the definition of the drag coefficient C D = 2F a /sρu 2 and the equation of particle motion in the flow behind the shock wave…”

Section: Dynamics Of the Drop In The Flow Behind The Shock Wave And Tmentioning

confidence: 99%

“…It was experimentally demonstrated [14] that dependence (3) provides an accurate description of particle motion in the SW until the time θ ≈ 1 and, hence, can be used for approximation of experimental data in finding C D . The value of λ is found from the condition of the best approximation, and Eq.…”

Section: Dynamics Of the Drop In The Flow Behind The Shock Wave And Tmentioning

confidence: 99%

“…Experimental data for a solid sphere were compared in [14] with the exact solution of Eq. (3) and with approximate solutions with two and three terms of expansion in Eq.…”

Section: Dynamics Of the Drop In The Flow Behind The Shock Wave And Tmentioning

confidence: 99%

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On the dynamics of drop acceleration at the early stage of velocity relaxation in a shock wave

Boiko

Poplavski

2009

Combust Explos Shock Waves

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The early stage of velocity relaxation of a water drop in a flow behind a shock wave under conditions of drop deformation and breakup is studied experimentally. The aerodynamic drag of the drop is measured on the basis of the dynamics of motion of its leading edge, and a strong dependence of the drag on the observation time is demonstrated. These data are compared with the drag obtained on the basis of the dynamics of the center of mass of the drop. The drag of the center of mass is shown to be comparable with the drag of a solid sphere and to be substantially smaller than the value determined from the leading edge motion. A possible physical mechanism of this effect is proposed, which is based on the delay of the beginning of motion of the center of mass of the drop, owing to certain specific features of stabilization of external and internal flows at the early stage of velocity relaxation.

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“…It was shown [12][13][14] that the definition of the drag coefficient C D = 2F a /sρu 2 and the equation of particle motion in the flow behind the shock wave…”

Section: Dynamics Of the Drop In The Flow Behind The Shock Wave And Tmentioning

confidence: 99%

Section: Dynamics Of the Drop In The Flow Behind The Shock Wave And Tmentioning

confidence: 99%

See 1 more Smart Citation

On the dynamics of drop acceleration at the early stage of velocity relaxation in a shock wave

Boiko

Poplavski

2009

Combust Explos Shock Waves

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“…Boiko and Poplavski [7] performed experiments on acceleration of balsa particles in gas flows with Mach numbers 0.5-1.5. To process the experimental results, they assumed that the drag coefficient was constant.…”

Section: Introductionmentioning

confidence: 99%

“…To process the experimental results, they assumed that the drag coefficient was constant. Its value was found on the basis of the exact solution of the equation of motion for a particle located in the gas flow behind the SW. Boiko and Poplavski [7] considered the value of C D obtained as a result of averaging during the observation time.…”

Section: Introductionmentioning

confidence: 99%

Motion of a particle behind the shock wave front

Федоров

Shul’gin

Poplavski

2010

Combust Explos Shock Waves

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A physicomathematical model that describes unsteady motion of particles behind the shock wave and a corresponding mathematical technology of processing of experimental data on particle trajectories and velocities are developed on the basis of a comprehensive theoretical and experimental approach of mechanics of heterogeneous media. Comparative calculations by various available formulas for the drag coefficient of particles are performed. A new correlation form of the drag coefficient is proposed, which offers a satisfactory description of the particle trajectories and velocities obtained in various experiments.

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Photogrammetry and ballistic analysis of a high-flying projectile in the STS-124 space shuttle launch

et al. 2010

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A method combining photogrammetry with ballistic analysis is demonstrated to identify flying debris in a rocket launch environment. Debris traveling near the STS-124 Space Shuttle was captured on cameras viewing the launch pad within the first few seconds after launch. One particular piece of debris caught the attention of investigators studying the release of flame trench fire bricks because its high trajectory could indicate a flight risk to the Space Shuttle. Digitized images from two pad perimeter high-speed 16-mm film cameras were processed using photogrammetry software based on a multiparameter optimization technique. Reference points in the image were found from 3D CAD models of the launch pad and from surveyed points on the pad. The threedimensional reference points were matched to the equivalent two-dimensional camera projections by optimizing the camera model parameters using a gradient search optimization technique. Using this method of solving the triangulation problem, the xyz position of the object's path relative to the reference point coordinate system was found for every set of synchronized images. This trajectory was then compared to a predicted trajectory while performing regression analysis on the ballistic coefficient and other parameters. This identified, with a high degree of confidence, the object's material density and thus its probable origin within the launch pad environment. Future extensions of this methodology may make it possible to diagnose the underlying causes of debrisreleasing events in near-real time, thus improving flight safety.

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Drag of nonspherical particles in a flow behind a shock wave

Cited by 16 publications

References 11 publications

On the dynamics of drop acceleration at the early stage of velocity relaxation in a shock wave

On the dynamics of drop acceleration at the early stage of velocity relaxation in a shock wave

Motion of a particle behind the shock wave front

Photogrammetry and ballistic analysis of a high-flying projectile in the STS-124 space shuttle launch

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