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<p>An experimental investigation on the effects of a mainstream injector on boundary layer combustion (BLC) induced by a porous plate or a Multi-Porthole Injector Array (MPIA) has revealed strong jet-wake interactions on BLC but minimal spanwise effect. Hydrogen was injected at low flow rates, but enough to promote combustion within the boundary layer. High speed schlieren imaging characterized flow features and interactions between the maintream injector and either the porous plate or MPIA. These images captured the additional shock added to the flow by the MPIA and the diffuse layer of combusting fuel by the porous plate. Spanwise and time integrated chemiluminescence showed minimal disruption to BLC. Instantaneous Planar Laser Induced Flourescence images revealed the interaction between the porthole injector and the two distributed injectors differed substantially along the centreline. This was corroborated by heat transfer measurements taken downstream of the porthole injector. For the porous injector, the diffuse reaction zone in the boundary layer was distorted in-situ by jet-wake turbulence. For the MPIA, the interaction caused significantly earlier ignition of the boundary layer fuel and the reaction zone to be lifted away form the wall.</p>

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Interaction of mainstream injection with supersonic boundary-layer combustion for hydrogen fuel

  • 期刊论文

  • 发表日期：

    2025年3月17日

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  • Jacob Sandral,
  • Tristan Vanyai,
  • Anand Veeraragavan,
  • Vincent Wheatley

摘要

An experimental investigation on the effects of a mainstream injector on boundary layer combustion (BLC) induced by a porous plate or a Multi-Porthole Injector Array (MPIA) has revealed strong jet-wake interactions on BLC but minimal spanwise effect. Hydrogen was injected at low flow rates, but enough to promote combustion within the boundary layer. High speed schlieren imaging characterized flow features and interactions between the maintream injector and either the porous plate or MPIA. These images captured the additional shock added to the flow by the MPIA and the diffuse layer of combusting fuel by the porous plate. Spanwise and time integrated chemiluminescence showed minimal disruption to BLC. Instantaneous Planar Laser Induced Flourescence images revealed the interaction between the porthole injector and the two distributed injectors differed substantially along the centreline. This was corroborated by heat transfer measurements taken downstream of the porthole injector. For the porous injector, the diffuse reaction zone in the boundary layer was distorted in-situ by jet-wake turbulence. For the MPIA, the interaction caused significantly earlier ignition of the boundary layer fuel and the reaction zone to be lifted away form the wall.