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  • 1
    Digitale Medien
    Digitale Medien
    Numerical study of 2D and 3D flowfields in a high-power pulsed chemical laser (1997)
    Bradford : Emerald
    International journal of numerical methods for heat & fluid flow 7 (1997), S. 24-41 
    Details
    ISSN: 0961-5539
    Quelle: Emerald Fulltext Archive Database 1994-2005
    Thema: Maschinenbau
    Notizen: High-power chemical lasers operating in high repetitive rate show a decrease of the output energy laser beam. In such lasers, the characteristic time which depends on the laser output is short in comparison with those related to the flow. Consequently, shock waves, acoustic waves and thermal perturbations, induced by the strong electric energy deposition and remaining in the laser cavity between two pulses, may explain the decrease of output energy of the laser beam. For a better understanding of the flowfields, a numerical approach is carried out using flux corrected transport algorithms (FCT methods) associated with a Riemann solver on the computational domain boundaries. Under two-dimensional assumptions, the inviscid flow in the convergent-divergent laser cavity is computed to describe the creation and propagation of the wave system and the hot gas column in both single and multidischarge operating modes. Distortions of the contact surfaces are put into evidence through the study of flowfield instabilities. Finally, the limitations of the two-dimensional modelization become apparent. The numerical resolution is extended to a 3D case in order to take into account the optical direction. This allows to study the influence of shock waves travelling between optics and being generated by a side effect developing at the electrodes. These waves have an effect of long duration on the flowfield and lead to a high residual perturbation level.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1108/09615539710156183
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Investigation of the hysteresis phenomena in steady shock reflection using kinetic and continuum methods (1996)
    Springer
    Shock waves 5 (1996), S. 341-346 
    Details
    ISSN: 1432-2153
    Schlagwort(e): Key words:RR $\leftrightarrow$ MR transition, Numerical simulation, Steady shock reflection
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik , Technik allgemein
    Notizen: Abstract. The problem of transition of planar shock waves over straight wedges in steady flows from regular to Mach reflection and back was numerically studied by the DSMC method for solving the Boltzmann equation and finite difference method with FCT algorithm for solving the Euler equations. It is shown that the transition from regular to Mach reflection takes place in accordance with detachment criterion while the opposite transition occurs at smaller angles. The hysteresis effect was observed at increasing and decreasing shock wave angle.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/PL00003880
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Investigation of the hysteresis phenomena in steady shock reflection using kinetic and continuum methods (1996)
    Springer
    Shock waves 5 (1996), S. 341-346 
    Details
    ISSN: 1432-2153
    Schlagwort(e): RR → MR transition ; Numerical simulation ; Steady shock reflection
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik , Technik allgemein
    Notizen: Abstract The problem of transition of planar shock waves over straight wedges in steady flows from regular to Mach reflection and back was numerically studied by the DSMC method for solving the Boltzmann equation and finite difference method with FCT algorithm for solving the Euler equations. It is shown that the transition from regular to Mach reflection takes place in accordance with detachment criterion while the opposite transition occurs at smaller angles. The hysteresis effect was observed at increasing and decreasing shock wave angle.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02434009
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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