Accession Number:

AD0252662

Title:

GASEOUS DETONATIONS XV. EXPANSION WAVES IN GASEOUS DETONATIONS

Descriptive Note:

Corporate Author:

HARVARD UNIV CAMBRIDGE MA GIBBS CHEMICAL LAB

Personal Author(s):

Report Date:

1961-02-17

Pagination or Media Count:

1.0

Abstract:

The UV absorption spectrum of OH and the visible light emission profile in the rarefaction wave following a detonation in C2H2 H2 2O2 were measured. Analysis of the absorption spectrum at an initial pressure of 60 mm Hg gives an average rotational temperature of 3164 K during the first 310 microsec. after the detonation wave front. The emission profiles demonstrated the presence of double waves at initial pressures higher than 90 mm and the appearance of these waves coincides with an increase in detonation velocity to that calculated using a frozen sound velocity. In expansion waves produced by bursting a thin diaphragm with the detonation wave, the emission intensity was higher than predicted and the velocity of the expanding gas and the shock wave ahead of it was lower than expected. To obtain the concentration of OH in the rarefaction wave, the velocity of the detonation wave, the UV absorption spectrum of OH, and the light emission in the rarefaction wave of the detonation of C2H2 H2 2O2 mixture were measured. The light emission also was measured in the expansion wave produced in vacuum by rupturing a diaphragm with a detonation wave in the above mentioned mixture strong shock waves have been produced in Ar by the same method. The shock velocity and the emission profile behind them were obtained. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE