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Abstract <p>The application of an expandable nozzle at flight altitudes up to 40 km is being considered, taking into account the presence of an external supersonic co-current stream. Numerically, in an unsteady formulation, the supersonic turbulent flow of a viscous compressible gas through a nozzle is computed, taking into account the dynamics of the opening of its expanded part. The distribution of pressure, temperature, and the change in axial force (nozzle thrust) over time at different flight altitudes is analyzed. The calculation of the unsteady processes when using an expandable nozzle in dense atmospheric layers, typical for the operation of rocket engines under launch and flight conditions at altitudes up to 40 km, is carried out.</p>

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Thrust Force Control of the Expandable Annular Nozzle Taking into Account the Aerogasdynamics of the External Flow

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Yu. V. Kaun,
  • M. V. Chernyshov

摘要

Abstract

The application of an expandable nozzle at flight altitudes up to 40 km is being considered, taking into account the presence of an external supersonic co-current stream. Numerically, in an unsteady formulation, the supersonic turbulent flow of a viscous compressible gas through a nozzle is computed, taking into account the dynamics of the opening of its expanded part. The distribution of pressure, temperature, and the change in axial force (nozzle thrust) over time at different flight altitudes is analyzed. The calculation of the unsteady processes when using an expandable nozzle in dense atmospheric layers, typical for the operation of rocket engines under launch and flight conditions at altitudes up to 40 km, is carried out.