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Buzz instabilities affect the performance of the inlet in terms of violent fluctuations in pressure, reduction in mass flow and hence thrust and can lead to combustion instabilities. The present work aims to study the effects of buzz instability in an axisymmetric intake. Further, Investigations are carried out on the effects of dynamic angular deflection of a portion of the cowl on intake buzzing. Ansys Fluent’s density-based solver is used to solve the RANS equations. It is found that angular deflection of the cowl surface moves the intake throat upstream and is capable of putting a stop to the shock oscillations. The amount of deflection required to stop buzzing at three different throttling conditions is determined.

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Cowl Deflection During Intake Buzz and Its Influence on Intake Performance

  • 会议论文

  • 发表日期：

    2025年

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  • Sanjana Rao,
  • Praveen Kumar,
  • Sudip Das

摘要

Buzz instabilities affect the performance of the inlet in terms of violent fluctuations in pressure, reduction in mass flow and hence thrust and can lead to combustion instabilities. The present work aims to study the effects of buzz instability in an axisymmetric intake. Further, Investigations are carried out on the effects of dynamic angular deflection of a portion of the cowl on intake buzzing. Ansys Fluent’s density-based solver is used to solve the RANS equations. It is found that angular deflection of the cowl surface moves the intake throat upstream and is capable of putting a stop to the shock oscillations. The amount of deflection required to stop buzzing at three different throttling conditions is determined.