초록 ▼

A first embodiment of the present invention provides a vortex generator in the form of a flexible piezoelectric actuator blade disposed in a wall of a flowpath, such as an airfoil. Another embodiment provides a synthetic jet actuator in which a pair of bimorph piezoelectric plates are connected by a

A first embodiment of the present invention provides a vortex generator in the form of a flexible piezoelectric actuator blade disposed in a wall of a flowpath, such as an airfoil. Another embodiment provides a synthetic jet actuator in which a pair of bimorph piezoelectric plates are connected by a flexible hinge.

대표청구항 ▼

A first embodiment of the present invention provides a vortex generator in the form of a flexible piezoelectric actuator blade disposed in a wall of a flowpath, such as an airfoil. Another embodiment provides a synthetic jet actuator in which a pair of bimorph piezoelectric plates are connected by a

A first embodiment of the present invention provides a vortex generator in the form of a flexible piezoelectric actuator blade disposed in a wall of a flowpath, such as an airfoil. Another embodiment provides a synthetic jet actuator in which a pair of bimorph piezoelectric plates are connected by a flexible hinge. an indication of said fuel level in said fuel cell.15. The system of claim 14 wherein the tool includes a fuel metering valve and said control unit is connected to said fuel metering valve, and further including a temperature sensor configured for sensing the temperature of said fuel cell and providing sensed temperature data to said control unit for corresponding adjustment of said valve.16. A method of monitoring and indicating fuel cell condition of a fuel cell in a combustion tool, comprising: providing a preset series of fuel cell condition values;monitoring fuel cell condition and obtaining current fuel cell condition data;comparing said monitored fuel cell condition data with said preset values;determining the amount of fuel in said fuel cell; andproviding a signal to an indicator for indicating the amount of fuel in the fuel cell.17. The method of claim 16 wherein said tool includes a fuel metering valve and said method further including:controlling the operation of the metering valve as a function of said determination of the amount of fuel in said fuel cell.18. The method of claim 16 further including:providing a temperature sensor associated with said fuel cell;monitoring the temperature of said fuel cell;providing temperature data in said comparison of said monitored fuel cell condition data and said preset values;determining the amount of fuel in said fuel cell as a function of temperature; andadjusting a fuel-metering valve in said tool in response to said determination.19. The method of claim 16 wherein said monitoring includes reading pressure values of fluid pressure in said fuel cell.20. The method of claim 16 wherein said monitoring includes reading fuel flow values of a flow of fluid between a fuel metering valve connected to said fuel cell and a combustion chamber.