The Early Development of Spherical Blast from a Particular Charge
Proceedings of the Royal Society A
258 merits, the Cs values being calculated from such d ata by the m ethod suggested by P alit et a l . (1954). Results indicate th a t the transfer capacity is of the ord 01 < Br < I, showing, as expected, th a t among similar halogen compounds iodine is more easily knocked out by a free radical. The growth of spherical blast from a particular charge, the initial behaviour of which was analyzed in Berry & H olt (1954), is determined by numerical integration o f equations of motion along
... otion along characteristics. The complete field o f disturbance and motion o f boundaries are calculated during the early stages of developm ent. It is found that, after a very brief outward m ovem ent, the second blast wave turns to m ove towards the centre of the explo sion; this is in agreement with observed behaviour. The results, m ost o f which are presented graphically, reveal a very rapid decline in pressure along both shocks, initially, and emphasize the dominating influence of the singularity at the origin o f blast on the subsequent course of the disturbance. In the course of the work several new numerical techniques involved in the application o f the method of characteristics are developed. Particular attention is drawn ( § 5) to the process of fitting a spherical shock wave between two non-uniform sectors of flow. The numerical method as a whole is quite general and, in later papers, application to spherical charges of other types will be described.