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.

An aircraft control system includes a flow control device and a control circuit. The flow control device is configured to control a flow of air around an aircraft. The control circuit is configured to control the flow control device so that a pressure distribution loaded on a surface of a structure that constitutes the aircraft is equal to a control value of a pressure distribution calculated based on a physical quantity detected by a sensor provided in the aircraft. The physical quantity relates to the air.

A flow control system includes a movable wing attachable to a wing of an aircraft, and a plasma actuator mountable on a surface of the movable wing. The flow control system is configured to control air flow around the wing by having the changing of the steering angle of the movable wing work in conjunction with the operation of the plasma actuator.

A vehicle fluid controller to be applied to a vehicle. The vehicle fluid controller includes a jet generator, a wind detector, and a jet controller. The jet generator is configured to generate a jet of air and is disposed at an edge of a vehicle-body opening through which a vehicle cabin of the vehicle is allowed to be open to an outside of the vehicle. The wind detector is configured to detect a speed and a direction of wind acting on the vehicle body of the vehicle. The jet controller is configured to control the jet from the jet generator in accordance with the speed and the direction of the wind in such a manner as to disturb an airflow passing over the vehicle-body opening along a surface of the vehicle body.

A rotor support device includes a plurality of first electrodes, a plurality of second electrodes, a dielectric material, and at least one alternating-current power supply. The dielectric material is disposed between the plurality of first electrodes and the plurality of second electrodes. The at least one AC power supply is configured to apply an alternating-current voltage across the plurality of first electrodes and the plurality of second electrodes and induce flows of gas by causing dielectric barrier discharge between the plurality of first electrodes and the plurality of second electrodes. At least one of the plurality of first electrodes or the plurality of second electrodes is disposed apart from each other in a static system that is stationary with respect to a rotor provided in an aircraft. The static system is adjacent to the rotor.

An airflow adjusting apparatus to be installed in a vehicle includes two or more outward airflow generators and a controller. The outward airflow generators are disposed side by side in a vehicle front-rear direction in vicinity of an outer edge in a vehicle widthwise direction on an upper surface of a vehicle body on a front side of a windshield. The outward airflow generators are each configured to form an outward airflow with respect to the vehicle body. The outward airflow flows in a direction that is toward an outer side in the vehicle widthwise direction and toward a rear side of the vehicle. The controller is configured to control the outward airflow generators.

Systems and methods are described herein to implement transverse momentum injection at low frequencies to directly modify large-scale eddies in a turbulent boundary layer on a surface of an object. A set of transverse momentum injection actuators may be positioned on the surface of the object to affect large-scale eddies in the turbulent boundary layer. The system may include a controller to selectively actuate the transverse momentum injection actuators with an actuation pattern to affect the large-scale eddies to modify the drag of the fluid flow on the surface. In various embodiments, the transverse momentum injection actuators may be operated at frequencies less than 10,000 Hertz.

A plasma actuator includes: a dielectric layer; a first electrode provided on the obverse surface of the dielectric layer; a second electrode provided, on the reverse-surface side of the dielectric layer, in one direction from the first electrode; a floating conductor pair that is provided between the first electrode and the second electrode and that has an obverse-surface conductor provided on the obverse surface of the dielectric layer and a reverse-surface conductor provided on the reverse-surface side of the dielectric layer, the obverse-surface conductor and the reverse-surface conductor being electrically connected to each other, electrically insulated from the first electrode and the second electrode, and positioned in the order of the reverse-surface conductor and the obverse-surface conductor in the one direction from the first electrode in plan view; and a power source connected to the first electrode and the second electrode.

Systems and methods are described herein to implement transverse momentum injection at low frequencies to directly modify large-scale eddies in a turbulent boundary layer on a surface of an object. A set of transverse momentum injection actuators may be positioned on the surface of the object to affect large-scale eddies in the turbulent boundary layer. The system may include a controller to selectively actuate the transverse momentum injection actuators with an actuation pattern to affect the large-scale eddies to modify the drag of the fluid flow on the surface. In various embodiments, the transverse momentum injection actuators may be operated at frequencies less than 10,000 Hertz.

Provided are: an adhesive sheet-shaped member for airflow, in an optimum form that can improve fuel efficiency and travel performance as a result of more effectively suppressing a large airflow separation phenomenon that becomes air resistance; and a travel vehicle using the same. A sheet-shaped member that is: provided thinly so as to prevent, as far as possible, the thickness thereof providing air resistance; adhered to a surface in contact with an airflow provided by a material that charges negative static electricity; formed in a long sheet shape in a flow direction of airflow, compared to the width direction of the airflow, so as to be adhered along the direction of the airflow; and provided using a material that charges a negative static electricity and has a different ease of static electrical charge than the surface in contact with the airflow.