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Accession Number:
AD1132547
Title:
Unsteady Separation Mechanism and Mitigation
Report Date:
2021-04-12
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.
Document Type:
Conference:
Journal:
Pages:
16
File Size:
4.95MB
FA9550-17-1-0153
(FA95501710153);
Contracts:
Grants:
Distribution Statement:
Approved For Public Release
