Kawasaki Jukogyo Kabushiki Kaisha

Tohoku University

Akio Ochi

Akihito Abe

Hidemasa Yasuda

Tomoka Tsujiuchi

Kenji Hayama

Eiji Shima

Keisuke Takashima

Kazuyuki Nakakita

Atsushi Komuro

Taku Nonomura

Yuichi Kumamoto

A flight vehicle includes a rotor shaft projecting upward from a body; a rotor head connected to the rotor shaft; and a pair of plate structures located at the upper side of the body and extending in a front-rear direction at right and left sides of the rotor shaft. Each of the pair of plate structures includes a front end, a rear end, an inner surface facing inward in a left-right direction, and an outer surface facing outward in the left-right direction. The front ends of the pair of plate structures are located away from each other in the left-right direction. The rear ends of the pair of plate structures are located away from each other in the left-right direction. During forward flight, pressure at a side where the outer surface is located becomes lower than pressure at a side where the inner surface is located.

Flight vehicle

A flow control method is a flow control method of controlling flow around a blade of a rotary wing, a plasma actuator being disposed at the blade. The flow control method includes: determining a characteristic frequency ratio that is a characteristic value among frequency ratios, each of the frequency ratios being a ratio between an actuator driving frequency and an angle of attack changing frequency, the actuator driving frequency being a frequency of an applied voltage applied to the plasma actuator, the angle of attack changing frequency being a frequency at which an angle of attack of the blade changes in accordance with a rotation angle of the blade; setting the actuator driving frequency such that the frequency ratio becomes the characteristic frequency ratio; and applying a voltage of the set actuator driving frequency to the plasma actuator to control the flow around the blade.

Flow control method and rotary wing unit

A grid convergence solution computation system computes a computed value (A) Of high-order accuracy, using a single grid, computes a computed value (A) of low-order accuracy, using the same single grid, and computes a grid convergence solution based on the relation between the computed value (A) of high-order accuracy and the computed value (A) of low-order accuracy on an assumption that the relation between the computed value (A) of high-order accuracy, the computed value (A) of low-order accuracy, and the grid convergence solution (A) is substantially constant regardless of fineness or coarseness of the grid. The grid convergence solution computation system computes a highly accurate grid convergence solution (A) by using small computational complexity.

Grid convergence solution computation system

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Kobe, Japan

Akio Ochi