Blast Waves Produced by Exploding Wires

Experiments on the interaction of a pair of cylindrical weak blast waves in air

“…However the analysis of Sakurai (1953) and Oshima (1960) have shown that this is only true asymptotically for blast waves of unbounded strength. For waves of finite strength one must be content with quasi-similarity in which 0 = O(Ms).…”

“…For waves of unequal strength it would not be practicable to simulate the problem by an HOB reflection in a surface (Dewey et al 1977). HOB experiments are not often done with line charges, although there are some results in the open literature (Oshima 1960;Cole 1965;Bennet 1968), however they are quite common with spherical charges (see for example Dewey 1964, Dewey et al 1977. Plooster (1970) has also done some numerical studies of cylindrical waves.…”

“…Finally the empirical law measured from the experimental data for R versus t is presented. This law is then compared with some similarity laws based upon analysis (Oshima 1960;Sakurai 1965;Lee et al 1969;Korobeinikov 1973;Higashino 1973Higashino , 1985.…”

Jump relations across a shock in non-ideal gas flow

“…Many theoretical and experimental studies were reported by various investigators on planer, cylindrical and spherical shock waves since the pioneering work of Guderlay (1942), Taylor (1950aTaylor ( , 1950b, Sedov (1959), and von Neumann (1947) on strong shock waves from point-source (mass-less) explosions. Shock waves of moderate strength emanating from point sources were theoretically studied by Sakurai (1953Sakurai ( , 1954Sakurai ( , 1964, Oshima (1960), Freeman (1968), and numerically by Goldstine and von Neumann (1955), and Bach and Lee (1970). In the other extreme of the nearly linear regime, when the shock has become rather weak Whitham (1960) proposed a general theory to cover such flows.…”

“…In the other extreme of the nearly linear regime, when the shock has become rather weak Whitham (1960) proposed a general theory to cover such flows. A number of approaches, including similarity method (Sedov, 1959;Zel'dovich and Raizer, 1966), power series solution method (Sakurai, 1953(Sakurai, , 1954(Sakurai, , 1964Oshima, 1960;Freeman, 1968), CCW method (Chester, 1954;Chisnell, 1955;Whitham, 1958), modified CCW method (Yousaf, 1987(Yousaf, , 1988 have been used for theoretical investigations of shock waves in different media. Rankine-Hugoniot shock conditions play a crucial role in all the above well known methods.…”