Evaluation of a Piezoelectric Pumping Interface Device
Final rept. 1 Jan 1974-31 Jan 1975
UNITED TECHNOLOGIES CORP WINDSOR LOCKS CT HAMILTON STANDARD CORP
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The report presents the results of a program to design and feasibility test a portion of a turbine engine fuel control system containing a piezoelectric device as the electronic-to-mechanical interface. The planned program consisted of designing and testing a breadboard of a unique hybrid pumping and metering fuel control. The conceptualized control was powered by a piezoelectric stack and was in a size category for a small gas turbine engine of a slinger nozzle type requiring approximately 700 pounds per hour of fuel at 300 psi. The control utilized the positive displacement pumping action of the piezoelectric powered piston to provide an output flow simulating the requirements for the engine starting mode. The output of an external centrifugal fuel pump for pressurization and simulation of maximum output flow was utilized for the control metering mode operation. Here the piezoelectric actuated piston was operated as a pulse-width modulated metering valve where the percentage of constant frequency pulse train excitation of the piezoelectric stack would define the percentage of maximum output flow.
- Jet and Gas Turbine Engines