FIELD: power engineering. SUBSTANCE: burner has axial blade swirler of air with blades and bushing and ring prechamber that abuts against it. The prechamber is defined by the bushing and cylindrical shell. A converging device is mounted at the outlet of the cylindrical shell. The bushing of the swirler passes through it being brought out of the ring prechamber. The length of the ring prechamber is a function of the height of the blade and angle of swirling of the flow inside the swirler. EFFECT: improved design. 3 cl, 4 dwg
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