Patent ID: 7654094

Claim:
A radial turbine comprising: a casing which covers all of a scroll, a shell and a diffuser while leaving a space therebetween. the diffuser connecting with the shell, the scroll being mounted inside the casing to form a first part of a combustion gas flow path for guiding a combustion gas generated in a combustor to a nozzle which injects the combustion gas to a radial impeller on an inner side in a radial direction of a rotary shaft, the shell covering the nozzle and the impeller and forming a second part of the combustion gas flow path; an airtight air flow path formed in said space in a substantially airtight state; an air take-in hole formed in the casing, which takes in air into the air flow path from the outside of the casing; a combustor outer cylinder mounted to the casing; a combustor liner mounted inside the combustor outer cylinder, which is communicated with the scroll and guides the combustion gas into the scroll; a blow-off hole which guides a first part of the air taken into the airtight air flow path, into the combustor liner; and through holes extending through the shell from the airtight air flow path on both sides of the nozzle adjacent a front edge of the nozzle and inclined at an angle toward a direction of flow of the combustion gas to inject a second part of the air taken into the airtight air flow path into the combustion gas passing through the nozzle, wherein the nozzle includes a circular blade cascade in which a number of blades are arranged in a row in a circumference thereof and of which a center is a turbine rotary shaft, and the through holes extending through the shell include a plurality of through holes along a surface of each blade of the circular blade cascade.