MEASUREMENTS OF OVERPRESSURE SIGNATURES FROM SUPERSONIC PROJECTILES. PART IV: THE 3-INCH/50 MK33 PROJECTILE

Authors
  1. Ritzel, D.V.
  2. Gottlieb, J.J.
Corporate Authors
Defence Research Establishment Suffield, Ralston ALTA (CAN)
Abstract
Sonic-boom overpressure signatures from the 3-inch/50 MK33 projectile have been measured in a field trial. The overpressure-time records were obtained at radial distances from the flight path, or miss distances, from 1 to 42 meters for flight Mach numbers ranging from 1.05 to 1.4. Measurements of the positive-overpress amplitude (peak overpressure), duration, impulse and decay rate were taken from the signatures and tabulated for each record. These measured data were subsequently reduced and compared to predictions from Whitham's theory for the flow disturbance far from the axis of a supersonic body. The study shows that Whitham"s far-field theory becomes valid only at large miss distances, beyond about 400 body diameters. An improved capability is required for predicting the signature, including intermediary shocks, within 400 body diameters. TRUNCATED
Report Number
M-1043 —
Date of publication
15 Jun 1982
Number of Pages
72
DSTKIM No
82-02882
CANDIS No
37257
Format(s):
Hardcopy;Originator's fiche received by DSIS

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