Accession Number : AD0277360

Title :   THE EFFECT OF RADIATION ON SHOCK VELOCITY ATTENUATION IN ELECTROMAGNETIC SHOCK TUBES

Corporate Author : AIR FORCE OFFICE OF SCIENTIFIC RESEARCH ARLINGTON VA

Personal Author(s) : THORNTON,J.A. ; CAMBEL,ALI BULENT

Report Date : APR 1961

Pagination or Media Count : 1

Abstract : OBSERVATIONS ARE REPORTED IN A STUDY OF EFFECTS OF RADIATION ON SHOCK VELOCITY ATTENUATION IN THE CONICAL ELECTROMAGNETIC SHOCK TUBE. A summary is included of findings which have appeared in the literature along with the approximate blast wave theory, which has become the primary method of making theoretical velocity attenuation calculations. These published observations lead to the question of the effect of radiation on the velocity attenuation in a tube with highly reflective walls such as might be employed in a propulsion system. The approximate blast wave theory is then adapted in developing a modified approximate method for calculating the effect of radiation on shock velocity attenuation. Approximate radiation equations are combined with the velocity attenuation equations and a study is made of factors which might influence the velocity attenuation by radiation. It is concluded that radiation will be an important factor only for strong shocks moving into a dense gas (approximately 1/10 atmosphere or greater and room temperature). A description of the electromagnetic shock tube is given, and some of the velocity attenuation experiments which are being conducted are discussed. No attenuation due to radiation has been noted. These experiments conducted at low velocities and densities thus agree with the predictions of the approximate blast wave theory modified to account for radiation effects. (Author)

Descriptors :   *RADIATION EFFECTS, *SHOCK WAVES, ATTENUATION, BLAST, DECELERATION, DISSOCIATION, ELECTROMAGNETIC FIELDS, IONIZATION, SHOCK TUBES, TEST METHODS, THEORY, VELOCITY

Distribution Statement : APPROVED FOR PUBLIC RELEASE