Advances in Turbine Airfoil Cooling Designs Enabled by Improvements in

Core Manufacture & Casting Capability

TURBINE BLADE COOLING METHODSTURBINE BLADE COOLING METHODS

4

HOTGAS

Cooling Air(a) Convection Cooling (b) Impingement Cooling

(c) Film Cooling (d) Full-coverage Film Cooling

(e) Transpiration Cooling

ADVANCES IN TURBINE BLADE COOLING

4000

3500

3000

2500

2000

15001960 1970 1980 1990 2000 2010

Single Piece, Single Cast,Single Crystal Transpiration Cooling

Advanced FilmCooling

Film Cooling

Impingement Cooling

Radial HoleCoolingSolid

Uncooled

YEAR OF APPLICATION

TUR

BIN

E IN

LET

TEM

PER

ATU

RE

(ÞF)

After Frasier US Patent 5295530

After Philip.Haley-RR-2000-Gas Turbine of the Future

Airfoil Cooling Technology Trends

After Philip.Haley-RR-2000-Gas Turbine of the Future

GE Aero Serpentine Design Circa 1971US patent 3,628,885

Note impingement cooling sheet metal insert at Leading Edge

IGT Vane Impingement Cooling DesignUS Patent 04297077

Note trailing edgepin fin design Note sheet metal

Inserts for impingementCooling in circuits 1 & 2

GE-Aero Multiwall-Cooling Circuit Design Circa 1992US Patent 5660524

ADVANCES IN TURBINE BLADE COOLINGRolls Royce Cast Cool Quasi-Transpiration Cooling

RR-Patent 5924483

IGT Bucket Radial Cooling DesignGE 6B 1st Bucket STEM Drilled Holes

GE GER-4217A

Cooling circuitsproduced by STEMdrilling radial holesin solid airfoil

IGT F-Class Bucket Serpentine Cooling DesignUS Patent 6,672,836

IGT Blade Cooling Radial STEM Drilled v Cored Cast Serpentine Designs

US Patent 6966756

Cooling circuitsproduced by STEMdrilling radial holes

Cooling circuitsproduced by complexceramic core duringcasting process

GE-Aero Multiwall-Cooling Circuit DesignUS Patent 7296973

Note details of crossover holesbetween some circuits increasing the

complexity of the ceramic core

ADVANCES IN TURBINE BLADE COOLINGIGT Turbines – Siemens Adv. Multiwall

US Patent Appl. Pub # 2006-0222495

ADVANCES IN TURBINE BLADE COOLINGIGT H Class Turbines – Closed Loop Steam Cooling

US Patent 5,743,708

US Patent 5,536,143