Accession Number : ADA255285


Title :   Advanced Development of Diagnostics for Non-Ideal Blast Flows


Descriptive Note : Technical rept. 1 Apr 1989-1 Jun 1991


Corporate Author : PHYSICAL RESEARCH INC TORRANCE CA


Personal Author(s) : Modarress, Dariush ; Hoeft, Thomas


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a255285.pdf


Report Date : Jul 1992


Pagination or Media Count : 102


Abstract : Investigations of non-ideal airblast are performed at the Ernst Mach Institute in a shock tube that simulates a radiation-induced thermal layer. Visualization techniques were adequate for overall study of the flow, but did not provide the detailed data for validation of computer codes. Under this contract three tasks were performed to provide needed data. The first task was to develop a software package for analysis of interferogram fringes. This package translates fringes shift due to the presence of helium into densities over the image area. This package was installed at EMI. The second task was to evaluate and test techniques for direct time-varying measurement of gas species concentration. Absorption spectroscopy of NO2 was selected to be used, but had corrosion problems and was abandoned. As a replacement, filtered Rayleigh scattering from Freon gas was identified. The third task was to fabricate and install a multi-location laser Doppler velocimeter system for the shock tube. This unit was installed in the shock tube and preliminary velocity measurements of flow over a rough surface were made.


Descriptors :   *AIRBURST , *NUCLEAR EXPLOSION SIMULATION , *BLAST LOADS , TEST AND EVALUATION , VELOCITY , COMPUTER PROGRAMS , DENSITY , MEASUREMENT , BLAST WAVES , LASERS , BOUNDARY LAYER FLOW , VELOCIMETERS , ABSORPTION , FLOW , HELIUM , SHOCK , RAYLEIGH SCATTERING , INTERFEROGRAMS , EXPLOSION EFFECTS , SHOCK TUBES , GAS DYNAMICS , TURBULENT FLOW , RADIATION , CORROSION , SPECTROSCOPY , INTERACTIONS , AIR FLOW


Subject Categories : Test Facilities, Equipment and Methods
      Nuclear Weapons
      Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE