Unsteady Separation Mechanism and Mitigation

Abstract

For a compressible, turbulent compression ramp flow, this project demonstrated upstream influence on separation unsteadiness, selective response of separation motion to controlled upstream disturbances, and strong effects of confining sidewalls. The results support a model of separation unsteadiness in which external forcing by boundary layer turbulence drives a weakly-damped global mode of the separation bubble. This case was termed a damped resonator; it represents an intermediate case between instabilities that can be characterized by amplifier or oscillator models. Effective flow control appears achievable by matching actuator-induced perturbations to the global mode of the separation bubble.

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Document Details

Document Type
Technical Report
Publication Date
Apr 12, 2021
Accession Number
AD1132547

Entities

People

  • Jonathan Poggie

Organizations

  • Purdue University

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Actuators
  • Air Force
  • Air Force Research Laboratories
  • Amplifiers
  • Astronautics
  • Availability
  • Boundaries
  • Boundary Layer
  • Buildings And Structures
  • Classification
  • Compression
  • Computational Fluid Dynamics
  • Contracts
  • Department Of Defense
  • Flow
  • Fluid Dynamics
  • Fluid Mechanics
  • Frequency
  • High Pressure
  • Hypervelocity Flow
  • Information Operations
  • Layers
  • Mechanics
  • Military Research
  • Scientific Research
  • Shock Waves
  • Skin Friction
  • Statistical Analysis
  • Turbulence
  • Turbulent Boundary Layer
  • Turbulent Flow
  • Turbulent Mixing
  • Universities

Fields of Study

  • Physics

Readers

  • Electronics Engineering
  • Fluid Mechanics and Fluid Dynamics.