FIELD: delivery of gas into liquid-filled reservoirs. SUBSTANCE: method and device are designed for creating and maintaining supersonic coherent gas flow. Proposed method and device are effective when handling oxidizing or inert gases. Device includes convergent/divergent nozzle for creating initial supersonic velocity, second and third passages located coaxially relative to main nozzle for forming slower movable three-layer envelope of flame coaxial relative to flow for effective maintenance of supersonic velocity. EFFECT: improved reliability. 10 cl, 4 dwg
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