STRUCTURE OF TURBULENT WAKES OF HYPERSONIC SPHERES AS INFERRED WITH ION PROBES

Authors
  1. Heckman, D.
  2. Sevigny, L.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
MONITOR AGENCY
Advanced Research Projects Agency, Arlington VA (US)
Abstract
Survey arrays of ion probes have been used to study the structure of the ionized turbulent wakes of 2.7 inch diameter spheres flown at 14,500 feet/second in atmospheres of nitrogen at pressures of 7.6 and 20 torr. For various radial distances measured from wake axis, matrices of data points have been obtained giving random values of the axial distance behind the projectile at which ionization begins, the first ionized eddy occurs, and continuous turbulence begins. A wake radius separating the significantly ionized wake from the unionized wake has been obtained, and found to lie intermediate between the inviscid wake radius defined by Wilson from schlieren measurements and an electron density radius corresponding to the 1/e points of the electron density distribution defined by microwave interferometric measurements. TRUNCATED
Report Number
669/72 —
Date of publication
15 Aug 1972
Number of Pages
58
DSTKIM No
73-02727
CANDIS No
18317
Format(s):
Hardcopy;Originator's fiche received by DSIS

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