traces Al and A2 show the speed of overdriven waves such as shown in Fig. 2a (A2 is the speed record for Fig. 2a). It can be seen that the wave speed is between 6 and 9% higher than the steady case and is gradually approaching the speed of the steady wave as the rarefaction interacts with the wave front, reducing its speed. The traces Bl and B2 show the speed of a wave, as in Fig. 2b, where the shock has not overtaken the detonation when it passes the transducer. It is apparent that the shock does overtake the detonation soon after passing the transducer, as evidenced by the increase of up to 7% in wave-front speed. (B2 is the speed record for Fig. 2b.)
ConclusionAn electromagnetic piston has been used to produce strong shock waves in the product flowfield of gaseous detonation waves. The interaction of these shock waves with the detonation front produced overdriven detonations as evidenced by the higher pressure and wave speed. This technique could be used for further study of the interaction of shock waves with supersonic flames.