Sealing structure for blade tip and gas turbine having the same

A sealing structure for a blade tip, comprising:

• a blade of a bucket mounted on an outer circumferential surface of a rotor disk coupled along a longitudinal direction to a rotor disposed inside a stator;
• and
• a tip seal having in a multi-row structure formed on an end of the blade and provided to prevent working fluid from leaking through a clearance established between an inner circumferential surface of the stator and the end of the blade,
• wherein the tip seal comprises:
• first rounded parts disposed at a predetermined angle relative to an axial direction of the rotor, each of the first rounded parts having a rounded end, and
• a rounded protrusion disposed between the first rounded parts disposed in a plurality of rows and having a rounded end, the rounded protrusion being provided to form a fluid barrier between the end of the blade and the inner circumferential surface of the stator when the blade rotates,
• wherein a height of the rounded protrusion is gradually reduced in a flow direction of working fluid.

A sealing structure for a blade tip, comprising:

• a blade of a bucket mounted on an outer circumferential surface of a rotor disk coupled along a longitudinal direction to a rotor disposed inside a stator;
• and
• a tip seal having a multi-row structure formed on an end of the blade and provided to prevent working fluid from leaking through a clearance established between an inner circumferential surface of the stator and the end of the blade,
• wherein the tip seal comprises:
• tapered parts disposed perpendicular relative to an axial direction of the rotor and tapered in a rotation direction of the rotor, and
• an inclined protrusion disposed between the tapered parts disposed in a plurality of rows and having an inclined end, the inclined protrusion being provided to form a fluid barrier between the end of the blade and the inner circumferential surface of the stator when the blade rotates,
• wherein a height of the inclined protrusion is gradually reduced in a flow direction of working fluid.