NASA NTRS · 19870000209
Variable-Diameter Nozzle
Abstract
Proposed device shapes and seals filled shells. Radial piezoelectric elements arranged like overlapping spokes on wheel contract to open hub and allow filled shell to emerge through. Stack of synchronized piezoelectric valves separated by spacers shape emerging pellet. Shells ranging in diameter from 2 millimeters to few centimeters produced.
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Wang, Taylor G.. 1987-04-01. Variable-Diameter Nozzle. https://ntrs.nasa.gov/citations/19870000209
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