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Dynamics of flow control in an emulated boundary layer-ingesting offset diffuser

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Abstract

Dynamics of flow control comprised of arrays of active (synthetic jets) and passive (vanes) control elements , and its effectiveness for suppression of total-pressure distortion is investigated experimentally in an offset diffuser, in the absence of internal flow separation. The experiments are conducted in a wind tunnel inlet model at speeds up to M = 0.55 using approach flow conditioning that mimics boundary layer ingestion on a Blended-Wing-Body platform. Time-dependent distortion of the dynamic total-pressure field at the ‘engine face’ is measured using an array of forty total-pressure probes, and the control-induced distortion changes are analyzed using triple decomposition and proper orthogonal decomposition (POD). These data indicate that an array of the flow control small-scale synthetic jet vortices merge into two large-scale, counter-rotating streamwise vortices that exert significant changes in the flow distortion. The two most energetic POD modes appear to govern the distortion dynamics in either active or hybrid flow control approaches. Finally, it is shown that the present control approach is sufficiently robust to reduce distortion with different inlet conditions of the baseline flow.

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Abbreviations

a i :

Time coefficient of the ith POD mode

AIP:

Aerodynamic interface plane

BL:

Boundary layer

BLI:

Boundary layer ingesting

BWB:

Blended wing body

D AIP :

Duct diameter at the AIP

DPCP:

Face-averaged SAE circumferential distortion descriptor

DPCPavg :

Time-averaged DPCP

H :

Diffuser inlet height

M :

Mach number

p 0 :

Total-pressure

p T0 :

Total-pressure upstream from the diffuser inlet

POD:

Proper orthogonal decomposition

t :

Time

Τ :

Actuation period

ϕ i :

ith POD mode (basis)

x m :

Time-averaged x

<x>:

Phase-averaged x

<x>′:

Coherent fluctuation of x

x′:

Incoherent fluctuation of x

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Acknowledgments

This work was funded by the Fundamental Aeronautics Program at the NASA Glenn Research Center under the direction of the Contract Officer’s Technical Representative, Ms. Julianne Dudek. The authors would also like to acknowledge numerous discussions with James Mace, Scott Mackie, and Michelle McMillan, and technical assistance from Michael Ferris and Paul Crnic of the Boeing Company.

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Authors and Affiliations

  1. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0405, USA

    A. N. Gissen, B. Vukasinovic & A. Glezer

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  1. A. N. Gissen
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  2. B. Vukasinovic
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  3. A. Glezer
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Correspondence to B. Vukasinovic.

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Gissen, A.N., Vukasinovic, B. & Glezer, A. Dynamics of flow control in an emulated boundary layer-ingesting offset diffuser. Exp Fluids 55, 1794 (2014). https://doi.org/10.1007/s00348-014-1794-5

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