Table of Contents
Active Combustion Control for Advanced Propulsion Application
OUTLINE
Schematics of Generic Engines
Active Combustion Control
MOTIVATION
Temperature Range for Low NOx and Low CO Operation in a Premixed Combustor
COMBUSTION INSTABILITIES
GOALS (Requirements)
RESEARCH OBJECTIVES
RAYLEIGH’S CRITERION
MODEL RAMJET DUMP COMBUSTOR
CLOSED-LOOP ACTIVE CONTROL SYSTEM
Actuator Performance (visualization and combustor transfer function)
Fuel Droplet Dispersion As A Result of Interaction with Vortex
Pressure Oscillation Amplitude .vs. Injection Timing
Closed-Loop Instability Suppression
Effect of Fuel Droplet Size on Combustion Control Efficiency
Induction Period
Effect of Fuel Droplet Size on Controlled Heat Release
Burning of Controlled Sprays
Effect of Fuel Droplet Size and Inlet Temperature on Controlled Heat Flux
Scaling Experiments (Summary of Flow Conditions)
Scaling Experiments
Critical Fuel Flux
Further Scaling Experiments Using Different Actuators
Normalization of Data
Acoustic Energy Ratio .vs. Fuel Flux
HEATED FLOW TESTS
Active Combustion Control (Heated Inlet Flow Case)
Demonstration of ACC over a Wide Range of Inlet Temperature
Quantifying Critical Fuel Flux
Effect of Inlet Temperature on Critical Fuel Flux
Effect of Inlet Temperature on Critical Fuel Flux (Tinlet>Tboil)
CONTROLLED .vs. UNCONTROLLED (Natural Light Flame Pictures)
SUMMARY POINTS
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