Kawasaki Jukogyo Kabushiki Kaisha

The Society of Japanese Aerospace Companies

Tohoku University

Sumitomo Precision Products Co., Ltd.

Kenji Hayama

Kazuhide Isotani

Masaru Ono

Akio Ochi

Eiji Shima

Toshiyuki Kumada

Hidemasa Yasuda

Tomoka Tsujiuchi

Keisuke Takashima

Noboru Masukawa

Atsushi Komuro

Taku Nonomura

Kazuyuki Nakakita

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 high-lift device includes a flap body which is provided at a rear portion of a main wing which generates a lift for the air vehicle such that the flap body is deployed with respect to the main wing and stowed in the main wing and extends along a wingspan direction of the main wing; and a gap increasing section provided at an end portion of the flap body in an extending direction of the flap body, to increase a gap between the rear portion of the main wing and a front portion of the flap body in a state in which the flap body is deployed.

High-lift device of air vehicle

A high-lift device of a flight vehicle includes: a flap main body provided at a trailing edge portion of a main wing of the flight vehicle so as to be extracted from and be retracted in the trailing edge portion and extending in a wing span direction of the main wing; and a vortex suppressing portion provided at a tip end portion of the flap main body in a wing span direction of the flap main body and configured to suppress a vortex rolling up from a lower surface of a tip end portion of the flap main body to an upper surface of the tip end portion.

High-lift device of flight vehicle

A method for attenuating aerodynamic noise from a landing gear may include researching a start point of a shear layer as a flow field characteristic of a region in the vicinity of an original shape of the landing gear, and adding a plate-shaped object in the vicinity of the start point, changing the start point to an edge portion of the plate-shaped object to make the shear layer farther from the original shape. Another method for attenuating aerodynamic noise from a landing gear may include researching a static pressure and an airflow velocity in a region in the vicinity of the landing gear as a flow field characteristic of the region, and adding a plate-shaped object covering a surface of the landing gear which is different from a surface facing an upstream side in an airflow direction, increasing the static pressure in the region to reduce the airflow velocity.

Method of attenuating noise in aircraft landing gear and structure

A jet noise source modeling method of creating a jet noise source model, includes: setting a plurality of point sound sources by quantizing a strength distribution of a jet noise source determined through an analysis of a jet stream and determining respective sound source strengths of respective point sound sources; and determining respective phases of the respective point sound sources based on a known noise level of a far free sound field related with the jet stream. An aircraft having an airframe capable of insulating the interior thereof from noises is designed on the basis of the results of the analysis.

Jet noise modeling method, jet noise analyzing method, and aircraft designing method

Growing community of inventors

Kakamigahara, Japan

Kenji Hayama