Impeller and turbomachinery including the impeller
An impeller includes a hub plate and a plurality of blades circumferentially disposed at intervals on one surface side of the hub plate. Each blade has a shape formed by piling up a plurality of blade sections in a blade height-wise direction of each blade in a reference impeller in which the hub plate intersects with the blades and which includes a linear element blade in the blade height-wise direction so as to form a curvilinear element blade. In piling up the blade sections, amounts of tangential lean and sweep to be applied to the blade sections are increased as it goes from an end face of at least one of a hub plate side end and a counter hub plate side end toward a span intermediate part of the blade.
1. An impeller, comprising: a hub plate; and a plurality of blades circumferentially disposed at intervals on one surface side of the hub plate, wherein
each of the plurality of blades comprising:
a shape formed by piling up a plurality of blade sections in a blade height-wise direction of each blade;
a curved surface; and
a curvilinear element connecting between a hub plate side end and a counter hub plate side end in the blade height-wise direction with curved line,
when movement of the blade sections in a direction of rotation of the impeller with the shape of the blade section being maintained congruent is defined as a positive tangential lean,
each of the plurality of blade sections constituting the blade has the positive tangential lean,
the tangential lean applied to the each of the plurality of blade sections differs by the blade height-wise position, and the blade has a profile that the tangential lean increases from an end face of at least one of a hub plate side end and a counter hub plate side end toward a span intermediate part of the blade.
2. An impeller comprising:
a hub plate; and
a plurality of blades circumferentially disposed at intervals one surface side of the hub plate,
wherein each of the plurality of blades comprising:
a shape formed by piling up a plurality of blade sections in a blade height-wise direction of each blade;
a curved surface; and
a curvilinear element connecting between a hub plate side end and a counter hub plate side end in the blade height-wise direction with curved line,
wherein movement of the plurality blade sections in a direction of rotation of the impeller with the shape of the blade sections being maintained congruent is defined as a positive tangential lean, each of the plurality of blade sections constituting the blade has positive tangential lean,
wherein a deformation of camber line of the blade section in a chord wise direction in a state that the position of the trailing edge being fixed and the shape of the camber line being maintained almost analogous is defined as a positive sweep, each chord of the plurality of blade sections constituting the blade has positive sweep, the sweep applied to each chord of the plurality of blade sections differs by the blade height-wise position, and the blade has a profile that sweep increases from an end face of at least one of a hub plate side end and a counter hub plate side end toward a span intermediate part of the blade.
3. The impeller according to claim 1 , wherein
the blade has a profile that the amount of the tangential lean of the hub side is larger than that a shroud side, and the plurality of blades have a profile such that a maximum value of the applied amounts is obtained at a blade height closer to the hub side than to a span central part.
4. The impeller according to claim 2 , wherein
the blade has a profile the amount of the tangential lean of the hub side is larger than that a shroud side, and the plurality of blades have a profile such that a maximum value of the applied amounts is obtained at a blade height closer to the hub side than to a span central part.
5. An impeller, comprising: a hub plate; and a plurality of blades which are circumferentially disposed at intervals on one surface side of the hub plate, wherein
each of the plurality of blades is a curvilinear element blade formed by piling up the blade section in the blade height-wise direction comprising:
a shape formed by piling up the blade sections in a blade height-wise direction;
a curved surface; and
a curvilinear element connecting between a hub plate side end and a counter hub plate side end in the blade height-wise direction with curved line, and
a profile of a suction surface of each of the blades located at a hind side in the rotational direction of the impeller has a foremost position at the hub plate side than at a span intermediate part to the blade in the blade height-wise direction, in a blade section form a hub plate side end to a counter hub plate side and over the same radius.
6. Turbomachinery comprising:
at least one or more impellers according to any one of claims 1 to 4 and 5 ;
a diffuser;
a return guide vane;
a collector; a rotating shaft;
bearings;
a casing;
a suction nozzle; and
labyrinth seals.