Structure of the Blast Wave with Ionization

Wu, S. T.; Fu, Tianzuo

doi:10.1063/1.1658751

Journal of Applied Physics

1970

DOI: 10.1063/1.1658751

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Structure of the Blast Wave with Ionization

S. T. Wu

Tianzuo Fu²

Abstract: Quarry blast acoustic wave (concussion)-response of structures and human annoyanceThe structure of a blast wave with ionization at local-thermodynamic-equilibrium (LTE) is analyzed by using the method of successive approximation to the non-similar solution. It is found that ionization has a significant effect on the decaying speed, and the first-order approximation. Numerical results are presented for plane, cylindrical, and spherical blast waves.

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Cited by 4 publications

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Interplanetary shock waves generated by solar flares

Dryer

1974

Space Sci Rev

153

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Recent observational and theoretical studies of interplanetary shock waves associated with solar flares are reviewed. An attempt is made to outline the framework for the genesis, life and demise of these shocks. Thus, suggestions are made regarding their birth within the flare generation process, MHD wave propagation through the chromosphere and inner corona, and maturity to fully-developed coronal shock waves. Their subsequent propagation into the ambient interplanetary medium and disturbing effects within the solar wind are discussed within the context of theoretical and phenomenological models. The latter -based essentially on observations -are useful for a limited interpretation of shock geometric and kinematic characteristics. The former -upon which ultimate physical understanding depends -are used for clarification and classification of the shocks and their consequences within the solar wind. Classification of limiting cases of blast-produced shocks (as in an explosion) or longer lasting ejecta (or 'piston'-driven shocks) will hopefully be combined with the study of the flare process itself.The theoretical approach, in spite of its contribution to clarification of various concepts, contains some fundamental limitations and requires further study. Numerical simulations, for example, depend upon a non-unique set of multi-parameter initial conditions at or near the Sun. Additionally, the subtle but important influence of magnetic fields upon energy transport processes within the solar wind has not been considered in the numerical simulation approach. Similarity solutions are limited to geometrical symmetries and have not exploited their potential beyond the special cases of the blast and the constant-velocity, piston-driven shock waves. These continuum fluid studies will probably require augmentation or even replacement by plasma kinetic theory in special situations when observations indicate the presence of anomalous transport processes. Presently, for example, efforts are directed toward identification of detailed shock structures (as in the case of Earth's bow shock) and of the disturbed solar wind (such as the piston).Further progress is expected with extensive in situ and remote monitoring of the solar wind over a wide range of heliographic radii, longitudes and latitudes.

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Interplanetary shock waves generated by solar flares

Dryer

1974

Space Sci Rev

153

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Approximate Blast Wave Theory and Experimental Data for Shock Trajectories in Linear Explosive-Driven Shock Tubes

Freiwald¹

1972

Journal of Applied Physics

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Semi-analytic model for plasma production and Cherenkov radiation emission from hypervelocity impacts on soda–lime glass

2023

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A semi-analytic method is proposed to compute the produced plasma and the emitted Cherenkov radiation from hypervelocity impacts on soda–lime glass for various projectiles and impact velocities. First, the Taylor–von Neumann–Sedov blast wave model, coupled with the system of nonlinear Saha equations for multispecies, strongly coupled plasma, is adopted to estimate the hydrodynamic profiles and the ionization state of the target material in the early stage of the impact. Second, the Frank–Tamm formula is considered to investigate the onset of the Cherenkov radiation and to compute the emitted energy. The present approach predicts a linear dependence of the produced total electric charge on the projectile density and a quadratic dependence on the projectile velocity, whereas the emitted Cherenkov radiation scales quadratically with the produced charge if the onset conditions are met.

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Structure of the Blast Wave with Ionization

Cited by 4 publications

References 6 publications

Interplanetary shock waves generated by solar flares

Interplanetary shock waves generated by solar flares

Approximate Blast Wave Theory and Experimental Data for Shock Trajectories in Linear Explosive-Driven Shock Tubes

Semi-analytic model for plasma production and Cherenkov radiation emission from hypervelocity impacts on soda–lime glass

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