Accession Number : ADP000258

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

Corporate Author : TORONTO UNIV DOWNSVIEW (ONTARIO) INST FOR AEROSPACE STUDIES

Personal Author(s) : Honma,H. ; Glass,I. I. ; Holst-Jensen,O. ; Tsumita,Y.

Report Date : JUL 1981

Pagination or Media Count : 10

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.

Descriptors :   *Shock waves, *Transitions, *Vibration, Excitation, Japan

Distribution Statement : APPROVED FOR PUBLIC RELEASE