Mitsubishi Heavy Industries Limited

Kabushiki Kaisha Riken

Motoshi Harada

Kai Karikomi

Kimihiko Mitsuda

Wakako Ariki

Yasuaki Shiraishi

Kenji Nakamichi

Hideaki Asai

Yuichi Kihara

Jun Fukada

Daisuke Hirayama

Provided is a piston ring including: a low-pressure side ring; and a high-pressure side ring, the low-pressure side ring and the high-pressure side ring are arranged stacked in a direction along the axis so that the high-pressure side ring is closer to a fluid to be compressed, a low-pressure side rotation restriction part configured to restrict rotation in the circumferential direction relative to the piston is formed to the low-pressure side ring, a high-pressure side rotation restriction part configured to restrict rotation in the circumferential direction relative to the piston and a low-pressure side protrusion protruding toward the low-pressure side ring and inserted in the low-pressure side abutment are formed to the high-pressure side ring, and the low-pressure side protrusion is inserted in a low-pressure side abutment with clearances being provided in both sides in the circumferential direction between the low-pressure side ring and the low-pressure side protrusion.

Piston ring and booster pump

A vortex generator for wind turbine blade includes: a platform; and at least one fin disposed projecting from an upper surface of the platform, and including a leading edge and a trailing edge. A rear end surface of the at least one fin, including the trailing edge, has a shape inclined backward as a distance from a bottom surface of the platform increases in a height direction of the fin.

Vortex generator for wind turbine blade, wind turbine blade, and wind power generating apparatus

A method for determining an arrangement position of a vortex generator on a wind turbine blade includes: determining, for a first region of a mounting range of the vortex generator in a blade spanwise direction, an arrangement position of the vortex generator to be an angular position offset by a predetermined angle toward a trailing edge of the wind turbine blade with reference to an inflow angle of wind to the wind turbine blade; and determining, for a second region closer to a blade tip, the arrangement position of the vortex generator to be a position between a separation position of a flow on a surface of the wind turbine blade under a rated wind speed condition and a transition position of the flow on the surface of the wind turbine blade under a variable speed operation condition of a wind turbine including the wind turbine blade.

Method for determining arrangement position of vortex generator on wind turbine blade, method for producing wind turbine blade assembly, and wind turbine blade assembly

A wind turbine blade has a vortex generator including a plurality of fins, and a height H(m) of each of the fins and a maximum chord length C (m) of the wind turbine blade satisfies 0.3&#xd7;10&#x2264;H/C&#x2264;0.9&#xd7;10. The height H of the fins may satisfy H&#x2265;0.1&#x3b4;, provided that &#x3b4;is a boundary layer thickness at a rated tip speed ratio in a blade degradation state. A method for determining arrangement of a vortex generator on the wind turbine blade includes a pair of the fins arranged line-symmetrically with respect to a segment along a chordwise direction of the wind turbine blade.

Wind turbine blade and method for determining arrangement of vortex generator on wind turbine blade

A wind turbine blade comprising a vortex generator including a plurality of fins. The plurality of fins include a first fin positioned closest to a blade tip, and the first fin is disposed closer to a blade root than a position closer to the blade tip, of a blade spanwise directional position at which a ratio t/C of a blade thickness 't' to a chord length C is 0.4 or a radial directional position of 0.2R with respect to a radius R of a rotor including the wind turbine blade. The vortex generator may include at least one fin disposed in a mounting range of zero to 0.1 R, such that a ratio x/C of a chordwise directional position x of the at least one fin to the chord length C satisfies 0&#x2264;x/C&#x2264;0.2.

A vortex generator for a wind turbine blade includes at least one fin including a suction surface and a pressure surface. Each of the at least one fin is configured such that, in at least a part of a height range of the fin, a maximum camber ratio cmax/C being a ratio of a maximum camber cmax to a fin chord length C decreases with distance from a root of the fin toward a tip portion of the fin.

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Tokyo, Japan

Motoshi Harada