ION DENSITY MEASUREMENTS IN THE WAKE OF A HYPERSONIC SPHERE

Authors
  1. S vigny, L.
  2. Heckman, D.
  3. Caron, P.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
MONITOR AGENCY
Advanced Research Projects Agency, Arlington VA (US)
Abstract
A report is presented of the results of a major research effort undertaken to determine experimentally, through the use of cylindrical electrostatic probes and existing probe theory, the levels of ion density in the turbulent wakes behind 2.7 in. diameter spheres flown at 14 500 ft/s in a ballistic range filled with nitrogen at 7.6 Torr and at 20 Torr. Measurements of the ion current distribution have been made by means of a transverse survey array of cylindrical electrostatic ion probes. Three static theories and three kinetic theories have been applied to the mean current data of the probes, and experimentally measured temperature and velocity distribution data for sphere wakes was used to construct radial distributions of ion density estimates for each theory. These radial distributions have been fitted with gaussian curves by the method of least mean squares. TRUNCATED
Date of publication
01 Jan 1972
Number of Pages
21
Reprinted from
Canadian J of Physics, vol 50, no 23, 1972, p2970-2990
DSTKIM No
74-00648
CANDIS No
21253
Format(s):
Hardcopy

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