	US 12,065,236 B2
	Systems and methods for active control of surface drag using intermittent or variable actuation
Ivan Marusic, Essendon (AU); Alexander J. Smits, Princeton, NJ (US); and David William Wine, Seattle, WA (US)
Assigned to Enterprise Science Fund, LLC, Bellevue, WA (US)
Appl. No. 17/786,417
Filed by Deep Science, LLC, Bellevue, WA (US)
PCT Filed Jan. 21, 2021, PCT No. PCT/US2021/014417 § 371(c)(1), (2) Date Jun. 16, 2022, PCT Pub. No. WO2021/150755, PCT Pub. Date Jul. 29, 2021.
Claims priority of provisional application 62/965,077, filed on Jan. 23, 2020.
Prior Publication US 2023/0012961 A1, Jan. 19, 2023
Int. Cl. B64C 23/00 (2006.01); B64C 21/04 (2023.01)

CPC B64C 23/005 (2013.01) [B64C 21/04 (2013.01); B64C 2230/06 (2013.01); B64C 2230/12 (2013.01)]

33 Claims

1. A fluid control system, comprising:

a surface comprising:

one or more non-actuating zones over which a fluid flows, and

one or more actuatable zones over which the fluid flows;

an actuator in the actuatable zone of the surface to inject momentum in-plane with the surface, wherein the actuator is positioned within the actuatable zone for actuation:

in-plane with respect to the surface, and

in a spanwise direction with respect to a direction of the fluid flow over the surface; and

processing circuitry to:

obtain a value of a parameter of the fluid; and

operate the actuator to inject momentum into the fluid in the spanwise direction to change a flow property of the fluid based on the obtained value of the parameter of the fluid.