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A purging and recharging system improves the repeating of detonations from a detonation device 10 having a detonation chamber 20 separated from an ignition chamber 25 by a detonation plate 22 having an opening 23 through which a flame jet can pass from ignition chamber 25 to detonation chamber 20. A

A purging and recharging system improves the repeating of detonations from a detonation device 10 having a detonation chamber 20 separated from an ignition chamber 25 by a detonation plate 22 having an opening 23 through which a flame jet can pass from ignition chamber 25 to detonation chamber 20. A differential piston 30 driven by a detonation in a differential cylinder 31, 32 around detonation chamber 20 affords a fluid passageway between differential piston 30 and detonation chamber 20. On a power stroke, differential piston 30 compresses recharging air and draws in cooling and exhaust purging air to surround detonation chamber 20. On a return stroke, differential piston 30 forces cooling and purging air into detonation chamber 20 and then admits compressed recharging air into detonation chamber 20. A check valve 55 on the detonation side of the opening in detonation plate 22 admits fluid and flame from ignition chamber 25 into detonation chamber 20 during ignition and blocks backflow of fluid or flame from detonation chamber 20 into ignition chamber 25 during detonation.

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A purging and recharging system for a repeating detonation device having a detonation chamber separated from an ignition chamber by a detonation plate having an opening through which a flame jet can pass from said ignition chamber into said detonation chamber, said system comprising: a. a differenti

A purging and recharging system for a repeating detonation device having a detonation chamber separated from an ignition chamber by a detonation plate having an opening through which a flame jet can pass from said ignition chamber into said detonation chamber, said system comprising: a. a differential cylinder surrounding said detonation chamber with an annular space therebetween; b. a differential free piston disposed for reciprocation within said differential cylinder, the top of said piston having upward sidewalls extending into said annular space and defining an expansion chamber directly communicating with said detonation chamber, via an opening formed in a bottom portion of said detonation chamber spaced inward from said sidewalls, and disposed for reciprocation relative to said detonation chamber, said sidewalls further affording a fluid passageway around the periphery of said detonation chamber, said free piston being driven by a detonation from said detonation chamber; c. said differential free piston being arranged on a power stroke for drawing in cooling and exhaust purging air to surround said detonation chamber and for compressing recharging air; d. said differential free piston being arranged on a return stroke for forcing said cooling and purging air into said detonation chamber and for admitting compressed recharging air to said detonation chamber; and e. a check valve arranged on the detonation side of said detonation plate over said opening to admit fluid and flame from said ignition chamber into said detonation chamber during ignition and to block backflow of fluid and flame from said detonation chamber into said ignition chamber during detonation. In a detonation device having an ignition chamber and a detonation chamber separated from said ingition chamber by a detonation plate having a plurality of openings each permitting the passage of fluid and flame from said ignition chamber into said detonation chamber, an improvement comprising: a. said openings being arranged around a peripheral region of said detonation plate; b. check valving arranged on solely on a side of said detonation plate facing of said detonation chamber downstream of said openings; and c. said check valving being arranged to admit fluid and flame from said ignition chamber through said openings in a swirling flow around a peripheral region of said detonation chamber during ignition and to block backflow of fluid and flame from said detonation chamber through said openings to said ignition chamber during detonation.