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Experimental study of shock-accelerated inclined heavy gas cylinder

Journal Article · · Experiments in Fluids
 [1];  [2];  [2];  [3];  [2];  [2]
  1. Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Mechanical Engineering; University of new Mexico
  2. Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Mechanical Engineering
  3. Indian Inst. of Technology (IIT), Kanpur (India). Dept. of Aerospace Engineering
An experimental study examines shock acceleration with an initially diffuse cylindrical column of sulfur hexafluoride surrounded by air and inclined with respect to the shock front. Three-dimensional vorticity deposition produces flow patterns whose evolution is captured with planar laser-induced fluorescence in two planes. Both planes are thus parallel to the direction of the shock propagation. The first plane is vertical and passes through the axis of the column. The second visualization plane is normal to the first plane and passes through the centerline of the shock tube. Vortex formation in the vertical and centerline planes is initially characterized by different rates and morphologies due to differences in initial vorticity deposition. In the vertical plane, the vortex structure manifests a periodicity that varies with Mach number. The dominant wavelength in the vertical plane can be related to the geometry and compressibility of the initial conditions. At later times, the vortex interaction produces a complex and irregular three-dimensional pattern suggesting transition to turbulence. We present highly repeatable experimental data for Mach numbers 1.13, 1.4, 1.7, and 2.0 at column incline angles of 0, 20, and 30 degrees for about 50 nominal cylinder diameters (30 cm) of downstream travel.
Research Organization:
Univ. of New Mexico, Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0002220; NA0002913
OSTI ID:
1368382
Journal Information:
Experiments in Fluids, Journal Name: Experiments in Fluids Journal Issue: 6 Vol. 58; ISSN 0723-4864
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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