Abstract: The disclosed apparatus includes a detonation chamber constructed in the form of a barrel, a spark plug mounted in the barrel and powder feeding and gaseous mixture delivering systems communicating with the detonation chamber. The powder feeding system include a batchmeter communicating with the source of carrier gas by means of a gas conduit with a control member of the carrier gas feed controller for controlling the quantity of carrier gas delivered to the batchmeter within a unit of time mounted thereon. The apparatus also includes a control system having a powder detector for detecting powder in the detonation products, electrically connected with a control unit. The control unit effects switching on of the mechanisms and the systems in a predetermined succession and switching on of the actuating mechanism of the carrier gas feed controller, depending on the detector signal indicative of the powder presense in the detonation products.