FLUID OPERATED ELECTRIC GENERATOR UTILIZING A PIEZOELECTRIC DEVICE

摘要

A fluid operated electric generator to convert fluid source energy, for example, in a rapidly moving vehicle or projectile to usable electrical power. The generator comprises an acoustic oscillator including an annular nozzle and an acoustically resonant cavity coaxial with the nozzle and spaced therefrom. The resonant cavity comprises a cylindrically shaped pipe having an annular knife edge facing the nozzle. Positioned at the bottom of and forming the end of the cylindrically shaped cavity is a piezoelectric disc. The fluid directed toward the cavity by the nozzle, upon striking the knife edge, produces acoustic oscillations which are stabilized at a single frequency by the resonant cavity and are coupled to the piezoelectric disc. The piezoelectric disc responsive to displacement by the acoustic oscillations provides an electrical signal at the oscillating frequency.