1. School of Aerospace Engineering MITE MITE PROGRAM OVERVIEW AND ACCOMPLISHMENTS (MITE-Multidisciplinary University Research Initiative on Intelligent Turbine Engines) Ben T. Zinn Schools of Aerospace and Mechanical Engineering Georgia Institute of Technology Atlanta, Georgia MITE Advisory Board Meeting June 17, 1998

2. School of Aerospace Engineering MITE MITE Program Overview –Start Date:November 1, 1995 –Research Team: Eleven faculty members with expertise in controls, compressors, combustion, propulsion, fluid mechanics, diagnostics, MEMS and neural net. –Facilities:Combustion, compressor, micro- electronics and fluid mechanics laboratories –Research Areas: Control of combustor processes, Nonlinear control theory, Control of compressor stall and surge, MEMS

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6. School of Aerospace Engineering MITE MITE Accomplishments: Compressors Modeling Efforts: –Two and three-dimensional compressible flow solvers for modeling compressor stall and surge control –A multi-mode model for rotating stall and surge in axial flow compressors –A centrifugal compressor model for surge control involving pressure, mass flow rate, and impeller RPM dynamics –Model extensions for compressor stall control via fuel modulations

7. School of Aerospace Engineering MITE MITE Accomplishments: Compressors Control methods –Reduced order models based on CFD for modeling compression system transients –Optimal nonlinear control framework to address disturbance rejection, control saturation and robustness –Adaptive control framework for elimination of rotating stall and surge –Nonlinear stabilization framework for interaction between higher order system modes – Combined model and fuzzy rule based methodology to address actuator rate and amplitude limits –Corrections to the theory of rotating stall control through amplitude feedback

8. School of Aerospace Engineering MITE MITE Accomplishments: Compressors Experimental Demonstrations –Rotating stall control through Throttling Recirculation of air from plenum to inlet Combustion process modulations Passive means New facility development –A centrifugal compressor facility for the study of flow dynamics, and for the development of active and passive control methods

9. School of Aerospace Engineering MITE MITE Accomplishments: Combustors  Synthetic Jets and Fuel-Air Mixing Control  Demonstrated mixing enhancement in single and co-flowing axisymmetric jets through combination of direct small-scale excitation and entrainment enhancement through amplitude modulation that creates large-scale structures  Controlled jet spreading and mixing rates, circumferential distribution of mixed "fuel", and jet swirl produced by azimuthal excitation  Pattern Factor Control Using Synthetic Jets  Experimentally demonstrated ability to uniformly mix combustor exhaust gases containing large temperature differences without injecting additional fluid

10. School of Aerospace Engineering MITE MITE Accomplishments: Combustors (continues)  Liquid Fuel Atomization Control  Developed and demonstrated liquid fuel injector that can produce small droplets and control droplet size over wide range of liquid flow rates using air liquid ratio below one  Sensors  Designed and successfully simulated a water-based, line-of-sight absorption sensor capable of monitoring combustor efficiency and temperature uniformity at the combustor exhaust/turbine inlet  Developed prototype of a MEMS pressure transducer with wireless readout and high temperature capability

11. School of Aerospace Engineering MITE MITE Accomplishments: Combustors (continues)  Controllers  Developed neural network for adaptive control of combustion instability with simulated performance capable of suppressing instabilities with 10% noise in a few seconds  Designed and produced neural network chip and produced real- time test setup for verifying chip operation  LES Modeling of Two-Phase Combustors  Developed new subgrid two-phase large-eddy simulation methodology  New LES method is more accurate and computationally cheaper at a larger droplet cut-off size when compared to conventional LES approaches

12. School of Aerospace Engineering MITE MITE Technology Transfer  Company Contacts  Southwest Sciences, MetroLaser, Boeing (St. Louis), United Technologies (Multiple contacts), General Electric (Multiple contacts), Allison, BEI Sensors, Kistler Instruments  Government Contacts  Wright-Pattersen AFB (Multiple contacts), NASA Lewis (Multiple contacts)  Patent Applications: 4  Publications:36  Presentations:40