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US 11,905,983 B2Granted
Systems and methods for active control of surface drag using electrodes
AssigneeDeep Science, LLC
InventorsBrian C. Holloway, David William Wine
Life of this patent
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Abstract
A fluid control system includes a dielectric-barrier discharge (DBD) device, and processing circuitry. The processing circuitry is configured to obtain a streamwise length scale of a fluid flowing over a surface. The processing circuitry is also configured to obtain a convective time scale of the fluid flowing over the surface. The processing circuitry is also configured to operate the DBD device, based on the streamwise length scale and the convective time scale, to adjust a flow property of the fluid.
Claims47
A fluid control system, comprising:
- a dielectric-barrier discharge (DBD) device;
- and
- processing circuitry configured to:
- obtain a streamwise length scale of a flow regime of a fluid flowing over a surface, where the streamwise length scale is between 10η and 100,000η, where η is a viscous length scale of the flow regime of the fluid;
- obtain a convective time scale of the flow regime of the fluid flowing over the surface, where the convective time scale is between 10η′ and 10,000η′, where η′ is a viscous time scale of the flow regime of the fluid;
- and
- operate the DBD device, based on the streamwise length scale and the convective time scale, to provide momentum in a spanwise direction to the fluid flowing over the surface to adjust a flow property of the fluid.
4 more elements
A method for controlling a property of a fluid that flows over a surface, the method comprising:
- obtaining a streamwise length scale and a convective time scale of a flow regime of the fluid that flows over the surface at least partially based on a sensor input,
- wherein the streamwise length scale is a function of a viscous length scale, η, of the flow regime of the fluid, and wherein the convective time scale is a function of a viscous time scale, η′, of the flow regime of the fluid;
- determining an operation of a dielectric-barrier discharge (DBD) device based on the streamwise length scale and the convective time scale of the flow regime to control a flow property of the flow regime of the fluid;
- and
- operating the DBD device according to the determined operation to provide momentum in a spanwise direction to the flow regime of the fluid that flows over the surface to adjust the flow property of the flow regime of the fluid.
2 more elements
A method for adjusting a property of a fluid that flows over a surface, the method comprising:
- obtaining a streamwise length scale of a flow regime of the fluid that flows over the surface, wherein the streamwise length scale is between 10η and 100,000η, where η is a viscous length scale of the flow regime of the fluid;
- obtaining a convective time scale of the flow regime of the fluid that flows over the surface, wherein the convective time scale is between 10η′ and 10,000η, where η′ is a viscous time scale of the flow regime of the fluid;
- and
- providing momentum to the fluid in a spanwise direction to adjust a flow property of the flow regime of the fluid based on the streamwise length scale and the convective time scale.
1 more element
A wind turbine comprising:
- a plurality of turbine blades;
- a base configured to support the turbine blades, wherein each of the plurality of turbine blades is configured to rotate relative to the base as a fluid flows across the plurality of turbine blades;
- and
- a fluid control system positioned on at least one of the turbine blades, the fluid control system comprising:
- a dielectric-barrier discharge (DBD) device;
- and
- processing circuitry configured to:
- obtain a streamwise length scale of at least one flow regime of the fluid;
- obtain a convective time scale of the at least one flow regime of the fluid;
- and
- operate the DBD device, based on the streamwise length scale and the convective time scale, to provide momentum in a spanwise direction to adjust a flow property of the fluid.
8 more elements
An aircraft comprising:
- a fuselage;
- a component comprising at least one of a wing or a flight control surface coupled with the fuselage;
- and
- a fluid control system positioned on at least one of the fuselage or the component, the fluid control system comprising:
- a dielectric-barrier discharge (DBD) device;
- and
- processing circuitry configured to:
- obtain a streamwise length scale of at least one flow regime of a fluid flowing over the at least one of the fuselage or the component;
- obtain a convective time scale of the at least one flow regime of the fluid;
- and
- operate the DBD device, based on the streamwise length scale and the convective time scale, to provide momentum in a spanwise direction to adjust a flow property of the fluid.
8 more elements
Dependencies are inferred from the claim text.