Abstract: To provide a method for improving a coercive force of epsilon-type iron oxide particles, and an epsilon-type iron oxide. Specifically, to provide a method for improving the coercive force of an epsilon-type iron oxide comprising: substituting Fe-site of the epsilon-type iron oxide with other element, while not substituting Fe of D-site in the epsilon-type iron oxide with other element, and the epsilon type iron oxide.

Abstract: A turbine includes an annular turbine blade body disposed on a flow path, a diaphragm outer ring installed at a tip side of the annular turbine blade body via a clearance, and seal fins formed to protrude from the diaphragm outer ring and configured to form small clearances with the annular turbine blade body, wherein dead water region-filling sections are formed in cavities in which main vortexes are generated, such that a dead water region that the main vortexes cannot reach is filled.

Abstract: A plurality of stepped parts which have step surfaces facing an upstream side in a rotating axial direction of a structural member are provided in a tip portion of a blade, and seal fins which extend toward a circumference surface of each of the stepped parts and form small clearances between the seal fin and the circumference surface corresponding to the each of the stepped parts is provided in the structural member. Also, lengths from the small clearance to the step surface on the upstream side along the rotating axial direction of the structural member are set such that one of the stepped parts on the downstream side is smaller than the other one of the stepped parts on the upstream side.

Abstract: A turbine (1) of the present invention comprises that at one part of a tip part (51) of the blade (50) and an area (11a) of the structure (11) corresponding to the tip part (51) of the blade, a stepped part (52) is formed, a seal fin (15) is provided at the another part of the tip part (51) of the blade and the area (11 a) of the structure (11), a cavity (C) is formed between the tip part (51) of the blade and the area (11a) of the structure (11) and between the seal fin (15) and a partition wall (54, 15). The seal fin (15) comprises a fin main body part (16), and a space restriction part (17). Thus, the present invention provides a high performance turbine in which the leakage flow rate is reduced.

Abstract: A turbine includes a blade, a structure installed at a tip section side of the blade via a gap and configured to relatively rotate with respect to the blade, a step section formed at the tip section of the blade, having at least one step surface, and protruding toward a portion opposite to the tip section of the structure, a seal fin formed at the portion opposite to the tip section of the structure, extending toward the step section, and configured to form a micro gap between the step section and the seal fin, and a cutout section formed at the step surface to be connected to an upper surface of the step section. The cutout section guides a separation vortex separated from a main stream of a fluid passing through the gap toward the seal fin on the upper surface of the step section.

Abstract: A rotating machine includes a casing (10) having a cavity (12) that a tip of a rotor blade enters, a plurality of sealing fins (17) extending from an inner circumferential surface of the cavity (12) of the casing (10) toward the tip of the rotor blade (50) and configured to seal a space between the casing (10) and the rotor blade (50), and swirl breakers (2) disposed between the plurality of sealing fins, extending from the inner circumferential surface of the cavity (12) of the casing (10) inward in the radial direction, and having swirl flow collision surface (3) with which a swirl flow collides and swirl flow transmission parts (n) formed at at least parts of the swirl flow collision surfaces (3) and through which the swirl flow passes in a circumferential direction.

Abstract: A steam turbine through which a fluid flows along an axis is equipped with: a tip shroud for turbine blades that are provided on a shaft that extends with the axis as a center; an outer partition plate ring that is provided on a casing so as to face the tip shroud in a radial direction and be capable of rotating relative to the tip shroud around the axis; seal fins that extend radially inward from the outer partition plate ring and that, with the tip shroud, form minute gaps therebetween; and steam introduction surfaces that are formed on downstream sides of the seal fins and are provided so as to face the seal fins within cavities where a main vortex, generated from a leakage flow passing through a minute gap, is generated, and that guide the flow, generated from the main vortex, toward the minute gaps.

Abstract: A rotary machine includes turbine moving blades (50); a casing (10) covering the turbine moving blades (50) so as to define a gap at an outer circumference side of the turbine moving blades; a leaf seal (70) having a seal body (71) that is disposed in the gap so as to protrude radially inward from the casing (10) and is capable of coming into contact with the turbine moving blades (50), and a high-pressure-side plate member (73) that is disposed along a face facing a high pressure side of the seal body (71); and a swirling flow inhibitor (80) that is provided on the high pressure side of the leaf seal (70) in the gap and inhibits a swirl flow flowing through the gap in a circumferential direction.

Abstract: The turbine related to the invention is a turbine including blades and a structure rotating relative to the blades and having a fluid flowing thereto. The turbine includes step portions that are provided in either radial tip portions of the blades or areas of the structure that face the radial tip portions; sealing fins that extend from the other toward the step portions, and form minute gaps between the sealing fins and the step portions; a flow collision surface that is provided upstream of the sealing fins in a flow direction of the fluid and against which the fluid collides; a protrusion that protrudes toward an upstream side from the flow collision surface; and a facing surface that faces the flow collision surface.

Abstract: The turbine is provided with a blade (50) and a structure body (11) which rotates relatively with respect to the blade (50). A stepped part (52A) having a step surface (53A) is installed at one of the leading end of the blade (50) and the structure body (11) corresponding to the leading end thereof, while a seal fin (15A) which extends toward the stepped part (52A) to form a small space (H) is installed at the other of them. A cavity (C1) is formed between the blade (50) and the structure body (11) and also between the seal fin (15A) and the partition wall which faces thereto in the rotating shaft direction of the structure body (11) on the upstream side. When a distance of the cavity (C1) between the partition wall and the seal fin (15A) is given as a cavity width (W), and a distance between the seal fin (15A) and the end edge (55) of the stepped part (52A) in the rotating shaft direction on the upstream side is given as (L), at least one of the distances (L) satisfies the following formula (1). 0.7H?L?0.

Abstract: Provided is a turbine. One of a tip portion of a blade and a portion of a partition plate outer ring corresponding to the tip portion of the blade is provided with a step part having a step face that protrudes toward the other, and the other is provided with seal fins) extending out with respect to the step part and forming minute clearance between the step part and the other. The step part facing the seal fins is configured to protrude so that a cavity forming a main vortex and counter vortex being formed by the main vortex are formed on an upstream side of the seal fins. The cavity is formed so that an axial width dimension and a radial height dimension satisfy Formula expressed by 0.45?D/W?2.67.

Abstract: A turbine includes a blade, a structure installed at a tip section side of the blade via a gap and configured to relatively rotate with respect to the blade, a step section formed at the tip section of the blade, having at least one step surface, and protruding toward a portion opposite to the tip section of the structure, a seal fin formed at the portion opposite to the tip section of the structure, extending toward the step section, and configured to form a micro gap between the step section and the seal fin, and a cutout section formed at the step surface to be connected to an upper surface of the step section. The cutout section guides a separation vortex separated from a main stream of a fluid passing through the gap toward the seal fin on the upper surface of the step section.

Abstract: A plurality of stepped parts which have step surfaces facing an upstream side in a rotating axial direction of a structural member are provided in a tip portion of a blade, and seal fins which extend toward a circumference surface of each of the stepped parts and form small clearances between the seal fin and the circumference surface corresponding to the each of the stepped parts is provided in the structural member. Also, lengths from the small clearance to the step surface on the upstream side along the rotating axial direction of the structural member are set such that one of the stepped parts on the downstream side is smaller than the other one of the stepped parts on the upstream side.

Abstract: The turbine (1) according to the present invention includes: a blade body (50) having a blade (59) provided at one of a rotor rotatably supported and a stator provided around the rotor and extending in a radial direction toward the other side from one side and a shroud (51) extending in a circumferential direction at a tip portion in the radial direction of the blade (59); and an accommodating concave body (11) provided at the other of the rotor and the stator, extending in the circumferential direction, accommodating the shroud (51) with a gap (G) interposed therebetween, and relatively rotating with respect to the blade body (50), wherein leakage flow (L) leaked from main flow (M) flowing along the blade (59) flows into the gap (G); and wherein the shroud is provided with a guide curved surface formed between a peripheral surface (53C) facing the accommodating concave body (11) and a trailing edge end portion (56) formed closer to the main flow (M) side in a downstream of the leakage flow (L) than the perip

Abstract: A turbine is provided including an annular turbine blade body (50) disposed on a flow path, a diaphragm outer ring (11) installed at a tip side of the blade body via a clearance, and seal fins (12A, 12B, 12C) formed to protrude from the diaphragm outer ring (11) and configured to form small clearances (13A, 13B, 13C) with the annular turbine blade body (50), wherein dead water region-filling sections (15, 17, 19) are formed in cavities (C1, C2, C3) in which main vortexes (SU1, SU2, SU3) are generated, such that a dead water region that the main vortexes (SU1, SU2, SU3) cannot reach is filled.

Abstract: Disclosed is a magnetic material having high Hc and High Curie point, which is capable of controlling such magnetic characteristics without requiring rare or expensive raw materials. Specifically disclosed is a magnetic material composed of particles of a magnetic iron oxide which is represented by the following general formula: ?-AxByFe2?x?yO3 or ?-AxByCzFe2?x?y?zO3 (wherein A, B and C each represents a metal excluding Fe and different from each other, satisfying 0<x, y, z<1), with ?-Fe2O3 as a main phase.

Abstract: A seal structure includes shrouds that are provided at tips of a plurality of blades on which a main flow of fluid impinges and that come into contact with adjacent shrouds to form a cylindrical shape; a sealing part connected to a structure body facing the shrouds; and a space that is defined by downstream sides of the shrouds, a downstream side of the sealing part, and a wall on a downstream side of the structure body, and that communicates with the main flow of fluid that has impinged on the blades. An end of the wall on the downstream side of the structure body is formed so as to be disposed a predetermined distance away from a shroud extension and away from a sealing-part extension and so as to be located on the opposite side of the shroud extension with respect to the sealing-part extension.

Abstract: Provided is a turbine in which seal fins (15) are provided to a hub shroud (41) to protrude toward a bottom surface (33a) of an annular groove (33), small gaps (H) are formed between the tip ends of the seal fins and the bottom surface of the annular groove, and assuming that the axial distance between a first seal fin (15a) disposed on the front edge side of the hub shroud among the seal fins and a front edge (41a) of the hub shroud is (L) and the axial distance between the front edge of the hub shroud and an inside surface (33b) of the annular groove is (Bu), the first seal fin is disposed to satisfy L/Bu<0.3.

Abstract: A turbine (1) of the present invention comprises that at one part of a tip part (51) of the blade (50) and an area (11a) of the structure (11) corresponding to the tip part (51) of the blade, a stepped part (52) is formed, a seal fin (15) is provided at the another part of the tip part (51) of the blade and the area (11a) of the structure (11), a cavity (C) is formed between the tip part (51) of the blade and the area (11a) of the structure (11) and between the seal fin (15) and a partition wall (54, 15). The seal fin (15) comprises a fin main body part (16), and a space restriction part (17). Thus, the present invention provides a high performance turbine in which the leakage flow rate is reduced.

Abstract: To provide a method for improving a coercive force of epsilon-type iron oxide particles, and an epsilon-type iron oxide. Specifically, to provide a method for improving the coercive force of an epsilon-type iron oxide comprising: substituting Fe-site of the epsilon-type iron oxide with other element, while not substituting Fe of D-site in the epsilon-type iron oxide with other element, and the epsilon type iron oxide.