University Research Engineering Technology Institute (URETI) on

Aeropropulsion & Power Technology (UAPT)

Compressor Control James Armor, Manuj Dhingra, Joseph Gillman, Vishwas Iyengar

Yi Liu, Yedidia Neumeier, J.V.R Prasad, L. SankarSchool of Aerospace EngineeringGeorgia Institute of Technology

Jvr.prasad@ae.gatech.edu

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Nondimensionalized Mass flow Rate (% design value)

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50% RPM

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100% RPM Measurement

Completed validation of the analysis through a component map generation for Rotors 67 and 37. Delivered the compressor analysis, with sample user input/output and sample grids, for adaptation to design methodologies Improved turn-around time 4 to 6 fold by parallelizing the analysis on OpenMP systems using 8 CPUs

Rotor 67 Performance Map

M∞ = 0.2, T0 = 5º, circulation control jet Mj= 0.4

(a) No jet (b) Leading edge jet

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ZFrame 001 13 Oct 2003 uvwFrame 001 13 Oct 2003 uvw

XY

ZFrame 001 13 Oct 2003 uvwFrame 001 13 Oct 2003 uvw

Effects of Circulation Control on leading edge of a nacelle

M∞ = 0.2, T0 = 0º, circulation control jet Mtrail= 0.4

(a) No jet (b) Trailing edge jet

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ZFrame 001 13 Oct 2003 uvwFrame 001 13 Oct 2003 uvw

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ZFrame 001 13 Oct 2003 uvwFrame 001 13 Oct 2003 uvw

Effects of Circulation Control on trailing edge region of a nacelle

Unblown Case Streamlines for Blown Case

Comparison between no circulation control and trailing edge blowing circulation control for a fixed wing

Flow Condition where circulation control was tested

Local separated flow due to high blade loading

Design Condition; 33.25 kg/sec Off-Design Condition; 29 kg/sec

Effects of Circulation Control Jet

c=0.0 c=0.11

Smaller region of flow reversal

Large reversed flow region

(a) (b)

Effect of Circulation Control on Flow Turningc=0.0 C=0.1

Velocity field in the blade fixed coordinate system at 10%R

Plenum Exhaust Duct Compressor (fan)KulitePressuresensor

Inlet

Control Computer

Portable Real-Time Computer

Pressure Sensor

Throttle Actuator

Implemented real-time auto-correlation algorithm on a portable system.

Integrated the auto-correlation based active stall avoidance scheme with a full engine controller.

Demonstrated active stall avoidance on a full engine during rapid transients.Completed the evaluation of the recirculation and circulation control concepts as a means of increasing the blade loading, and for achieving flow turningApplied our approach to a multi-stage compressor configuration

Surge

Demonstration of Active Stall control on the GT-Axial Facility

Controller overrides commanded throttle

Precursors Observed

Pressure Side

Suction Side

Away From Stall

Near Stall

Shaft Cycle

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Stall

Advance warning

Engine Tests: Advance Stall Warning during transients

CFD Analysis of Compressor Performance

CFD Analysis of Nacelle and Center Bodies

Completed a version of the analysis that can model flow through nacelles and center-bodies. The fan blades may be individually modeled, or represented as an actuator disk.Delivered the nacelle analysis, with sample user input/output and sample grids, for adaptation to design methodologies

Georgia Tech Axial Compressor RigStall Precursor Analysis

Mass Flow (lbm)

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Open Loop

Mass Flow (lbm)

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Compressor Active Stall Control

Circulation Control Aerodynamics

Angle of Attack 0 degrees, Integral Flap at 30 degrees

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Cl

Cl, Measured

Cl, Computed

Georgia Institute of TechnologyAtlanta, GeorgiaFounded 1885

Numerical Simulation Studies of Active Stall Control

Numerical Study of Circulation Control