MITE PROGRAM OVERVIEW AND ACCOMPLISHMENTS

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• 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

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• 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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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
  surgein 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

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MITE Accomplishments Compressors

• Control methods
• Reduced order models based on CFD for
  modelingcompression 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
  interactionbetween higher order system modes
• Combined model and fuzzy rule based
  methodologyto address actuator rate and
  amplitude limits
• Corrections to the theory of rotating stall
  control through amplitude feedback

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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

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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

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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

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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

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• 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