DETERMINATION DU CHAMP DE VITESSE DU SILLAGE D'UNE SPHERE HYPERSONIQUE A L'AIDE DE PEIGNES DE SONDES IONIQUES

Authors
  1. Sevigny, L.
  2. Heckman, D.
  3. Emond, A.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
MONITOR AGENCY
Advanced Research Projects Agency, Arlington VA (US)
Abstract
The technique of measuring convection velocity in the hypersonic wake with a pair of in-line probes has been applied on a large scale to the mapping of the velocity field in the hypersonic wake through the use of a transverse survey array containing up to 8 ion-probe pairs. Measurements are reported of the velocity field in the wakes of 2.7 in. diameter spheres flown at 14 500 f/s in ballistic range atmospheres at 7.6 Torr and at 20 Torr of nitrogen. The array technique leads to convection velocity results which are in excellent agreement with the mean wake velocity data obtained by the sequential spark technique in an air atmosphere. In addition, the technique has permitted an extension of the mapping of the velocity field of 15 000 f/s spheres to considerably smaller axial distances than was possible with the spark method because of the difficulty of forming distinct sparks at the higher levels of ambient ionization encountered in the near wake. TRUNCATED
Date of publication
01 Jan 1972
Number of Pages
14
Reprinted from
Canadian J of Physics, vol 50, no 16, 1972, p1842-1855
DSTKIM No
73-03822
CANDIS No
19096
Format(s):
Hardcopy

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