| US 7,540,158 B2 | ||
| Multistage turbine with single blade row, and gas turbine using same | ||
| Shiki Iwase, Chofu (Japan); and Yoshio Saito, Chofu (Japan) | ||
| Assigned to Japan Aerospace Exploration Agency, Tokyo (Japan) | ||
| Filed on Apr. 03, 2006, as Appl. No. 11/395,169. | ||
| Claims priority of application No. 2005-107211 (JP), filed on Apr. 04, 2005. | ||
| Prior Publication US 2006/0222484 A1, Oct. 05, 2006 | ||
| Int. Cl. F02C 3/04 (2006.01) | ||
| U.S. Cl. 60—805 [60/774; 60/751] | 2 Claims |
| 1. A multistage turbine with a single rotor blade row for causing a working fluid passing through a rotor blade row (3) to pass through the rotor blade row (3) again, and thereby subjecting the working fluid to adiabatic expansion a number of times to output power, the multistage
turbine with the single rotor blade row comprising:
a first stationary blade row (2) which is positioned at an upstream of the rotor blade row (3) and causes the working fluid to flow into the rotor blade row (3) while increasing the speed of the working fluid; and
a second stationary blade row (4) which is positioned at a downstream of the rotor blade row (3) and separates the working fluid flowing out of the rotor blade row (3),
wherein, when stationary blades which separate the high-pressure working fluid (FH) and the low-pressure working fluid (FL) in the first stationary blade row are taken as reference blades and some of the reference blades, which are disposed so
that the high-pressure working fluid (FH) flows in parallel with and preceding the low-pressure working fluid (FL) with respect to a direction of movement of the rotor blade row (3) are defined as a first reference blade (21a) respectively and some of the reference blades, which are disposed so that the high-pressure working fluid (FH) flows in parallel with and following the low-pressure working fluid (FL) with respect to the direction of movement of the rotor blade row (3) are defined as a second reference blade (21b) respectively, the multistage turbine being characterized in that:
a first corresponding blade (41a) of the second stationary blade row in relation to one of the first reference blades (21a) is disposed in the vicinity of the distance, which is determined by an expression 2×U×T, where T is the time required for
the high-pressure working fluid to pass through one of the rotor blades of the rotor blade row (3) and U is traveling speed of the rotor blade in a circumferential direction, with respect to the direction of movement of
the rotor blade (31) from a lower end of the rotor blade when the rotor blade makes the closest approach to the first reference blade (21a), and
wherein a second corresponding blade (41b) of the second stationary blade row in relation to one of the second reference blades (21b) is disposed in the vicinity of a lower end of one of the rotor blades of the rotor blade row (3) when the rotor blade makes the closest approach to a lower end of the second reference blade (21b).
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