Accession Number:

ADP000258

Title:

Weak Spherical Shock-Wave Transitions of N-Waves in Air with Vibrational Excitation,

Descriptive Note:

Corporate Author:

TORONTO UNIV DOWNSVIEW (ONTARIO) INST FOR AEROSPACE STUDIES

Report Date:

1981-07-01

Pagination or Media Count:

10.0

Abstract:

The effects of vibrational excitation on shock-wave transitions of weak sperical N-waves were investigated for overpressures below 100 Pa. The spherical N-waves were generated by using sparks and exploding wires as sources in a still-air dome of 40-m diam. The pressure profiles of the N-waves were observed by using high-frequency microphones, which were located at several positions 10-30m from the source. It was found that the measured risetimes of the N-waves for overpressures of 5-30 Pa and half duration of 50-120 microsec were much shorter than the risetime estimated from the theory of plane, fully-dispersed waves with vibrational excitation of oxygen.

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE