MEASUREMENTS OF OVERPRESSURE SIGNATURES FROM SUPERSONIC PROJECTILES. PART II: THE 3-INCH/70 MK34 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/70 MK34 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 of about 1.8. Measurements of the positive-overpressure amplitude (peak overpressure), duration, impulse and decay rate were obtained from the signatures and tabulated for each record. The 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 500 body diameters. An improved capability is required for predicting the signature, including intermediary shocks, within 500 body diameters. TRUNCATED
Report Number
M-1041 —
Date of publication
15 Jun 1982
Number of Pages
39
DSTKIM No
82-02884
CANDIS No
37259
Format(s):
Hardcopy;Originator's fiche received by DSIS

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