Accession Number : AD0466304


Title :   MEASUREMENT OF SHOCK WAVE THICKNESS BY THE ELECTRON BEAM FLUORESCENCE METHOD


Descriptive Note : TECHNICAL REPT.


Corporate Author : CALIFORNIA UNIV BERKELEY INST OF ENGINEERING RESEARCH


Personal Author(s) : Talbot, L ; Robben, F


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/466304.pdf


Report Date : May 1965


Pagination or Media Count : 38


Abstract : Shock wave thicknesses and density ratios have been measured in helium, argon and nitrogen by means of the electron beam fluorescence method, over the range 1.5 M 17.4, in a low density wind tunnel. The shock thickness in argon and helium agreed well with Mott-Smith theory at the higher Mach numbers, and were between NavierStokes and Mott-Smith theory at the lowest Mach number. In nitrogen, the measured shock thicknesses were considerably greater than the predictions of Navier-Stokes theory. Measured density ratios across the shock wave were in good agreement with theory, in the lower density flows. Poorer agreement was found at higher flow densities, leading to estimates of upper bounds for the range of linear variation of fluorescence intensity with gas density. Measured density ratios for shocks produced in divergent free-jet flows were found to be in better agreement with theory after a viscous curvature correction was applied.


Descriptors :   *DENSITY , *ELECTRON BEAMS , MEASUREMENT , THICKNESS , MATHEMATICAL PREDICTION , ARGON , WIND TUNNELS , JET FLOW , HELIUM , FLUORESCENCE , SHOCK WAVES , NITROGEN


Subject Categories : Particle Accelerators
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE