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Abstract <p>This study presents the results of an experimental investigation of hydrogen diffusion combustion in a nozzle assembly with independent coaxial air supply. Two flow configurations were examined. In the first, hydrogen was injected through a cylindrical micro-nozzle and surrounded by air flowing through an annular slit. In the second, hydrogen was supplied through an annular slit, while air was delivered via a central cylindrical micro-nozzle.The paper describes the combustion regimes observed under both configurations and highlights a beneficial effect that enables sustained hydrogen combustion in the presence of a water vapor flow. Particular attention is given to the “flame trapping” phenomenon, in which combustion is confined to a narrow conical region near the nozzle exit, occurring when hydrogen emerging from the annular slit interacts with a supersonic air jet from the coaxial micro-nozzle.</p>

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Study of Diffusion Combustion of a Hydrogen Microjet in the Presence of a Coaxially Supplied Air Flow

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • A. S. Tambovtsev,
  • V. V. Kozlov,
  • Yu. A. Litvinenko,
  • A. G. Shmakov

摘要

Abstract

This study presents the results of an experimental investigation of hydrogen diffusion combustion in a nozzle assembly with independent coaxial air supply. Two flow configurations were examined. In the first, hydrogen was injected through a cylindrical micro-nozzle and surrounded by air flowing through an annular slit. In the second, hydrogen was supplied through an annular slit, while air was delivered via a central cylindrical micro-nozzle.The paper describes the combustion regimes observed under both configurations and highlights a beneficial effect that enables sustained hydrogen combustion in the presence of a water vapor flow. Particular attention is given to the “flame trapping” phenomenon, in which combustion is confined to a narrow conical region near the nozzle exit, occurring when hydrogen emerging from the annular slit interacts with a supersonic air jet from the coaxial micro-nozzle.