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Investigation of shock boundary layer interactions to unravel the physics of unstart in axisymmetric inlets

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Technical Report,30 Sep 2016,29 Sep 2019

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North Carolina State University Raleigh United States

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The vision of the project is to bring about an unprecedented understanding of the mechanisms that result in the inflated propensity of the axisymmetric inlets to unstart. Given the preponderance of the shock boundary layer interactions SBLI in inlets and their critical role towards unstart in planar geometries, the objective of the present effort is to unravel how the shock interactions with axisymmetric inletisolator boundary layers can inflate their unstart propensity. The objective was approached from three specific angles 1. Unravel the response of the started inlet with unseparated boundary layers to back pressure fluctuations and the length scales over which a given shock leg would respond to a downstream pressure fluctuation within the isolator. 2. Make detailed investigations of the unique phenomena and mechanisms that occur with shock interactions with axisymmetric inletisolator geometries, which causes the inflated propensity to unstart. 3. Investigate the changes in the SBLI within the inletisolator duct caused by circumferential variations in the incoming boundary layer, which both provide insights into situations that occur in angle of attack flight as well as opportunity to delay the onset of inlet unstart.

Subject Categories:

  • Fluid Mechanics
  • Jet and Gas Turbine Engines

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