Model Test Investigation Of Shock Wave Reflection With The Aid Of High Speed Shadow-Schlieren Visualisation And Pressure Gauges

W. Heilig; H. Reichenbach

doi:10.1117/12.967980

1 February 1985 Model Test Investigation Of Shock Wave Reflection With The Aid Of High Speed Shadow-Schlieren Visualisation And Pressure Gauges

W. Heilig, H. Reichenbach

Author Affiliations +

Proceedings Volume 0491, 16th Intl Congress on High Speed Photography and Photonics; (1985) https://doi.org/10.1117/12.967980
Event: 16th International Congress on High Speed Photography and Photonics, 1984, Strasbourg, France

Abstract

During the process of shock wave reflection at plane and curved walls (wedges and cylinders) the front reflection pressure was measured in shock tube runs using pressure transducers and indirectly by evaluating schlieren pictures. Shock incidences were especially chosen in those angular regions where transition from regular reflection to irregular reflection occurs. A basic difference in the trend of the reflection pressure is recognizable at the various shaped obstacles. In the case of the plane wall the pressure increases with increasing angles of incidence until the termination of the phase of regular reflection and decreases during the subsequent phase of irregular reflection. This enhanced front reflection pressure can be higher than that resulting from head-on reflection. At the curved wall, the pressure decreases monotonically throughout the entire phase of regular reflection. The first case, being pseudosteady, is predicted by the von Neumann reflection theories, not so the latter case, which is truly a non-stationary process. However, not only the geometric shape of the body surface influences the reflection phases but also its quality. By a series of shadow-schlieren pictures it is qualitatively shown that the surface roughness delays the development of regular reflection and Mach reflection remarkably and that at plane obstacles as well as at curved ones. So it must be taken into account that the trend of pressure also depends on realistic parameters.

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W. Heilig and H. Reichenbach "Model Test Investigation Of Shock Wave Reflection With The Aid Of High Speed Shadow-Schlieren Visualisation And Pressure Gauges", Proc. SPIE 0491, 16th Intl Congress on High Speed Photography and Photonics, (1 February 1985); https://doi.org/10.1117/12.967980

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