초록 ▼

An arrangement for supplying coolant flow to turbine blades in a gas turbine engine is disclosed which utilizes a preswirl assembly to impart a tangential velocity to the coolant flow substantially greater than the tangential velocity of the rotor at the point at which the air is supplied to the rot

An arrangement for supplying coolant flow to turbine blades in a gas turbine engine is disclosed which utilizes a preswirl assembly to impart a tangential velocity to the coolant flow substantially greater than the tangential velocity of the rotor at the point at which the air is supplied to the rotor. The overswirled air is injected radially inwardly into an internal passage contained in the rotor, and the coolant flow continues to be an overswirled condition within the internal passageway. The amount of overswirl imparted to the coolant flow is such that the tangential velocity of the coolant flow is greater than the tangential velocity of the blades at the location on the blades the coolant flow is supplied to the blades for blade cooling, thereby resulting in substantially improved efficiency in the cooling system.

대표청구항 ▼

A device for delivering coolant flow to a plurality of rotor blades mounted about the outer periphery of a rotor disc, said rotor disc being mounted onto and extending radially outwardly from a rotor contained in a gas turbine engine, said device comprising: a stationary preswirl assembly mounted ci

A device for delivering coolant flow to a plurality of rotor blades mounted about the outer periphery of a rotor disc, said rotor disc being mounted onto and extending radially outwardly from a rotor contained in a gas turbine engine, said device comprising: a stationary preswirl assembly mounted circumferentially about a location on said rotor and spaced away from said disc, said preswirl assembly being supplied with pressurized coolant flow, said preswirl assembly arranged and configured to direct said pressurized coolant flow radially inwardly towards said location while simultaneously imparting a tangential velocity to said coolant flow; means for forming an internal passageway rotating with said rotor; means for admitting said coolant flow directed radially inwardly towards said location on said rotor into said internal passageway, said coolant flow being channeled within said internal passageway from said location on said rotor to said blades, the tangential velocity imparted to said coolant flow being sufficiently higher than the tangential velocity of said rotor at said location to ensure that the tangential velocity of said coolant flow, at the location said coolant flow is supplied to said blades, exceeds the tangential velocity of said blades at the location said coolant flow is supplied to said blades to form an overswirled flow, wherein said coolant flow is overswirled between 10% and 125% by said preswirl assembly.