EP 0203431 A1 19861203 - Impingement cooled transition duct.
Title (en)
Impingement cooled transition duct.
Title (de)
Prallkühlung für einen Turbineneinlasskanal.
Title (fr)
Canal de transition refroidi par impact.
Publication
Application
Priority
US 73401885 A 19850514
Abstract (en)
A transition duct in an advanced heavy duty gas turbine engine is cooled by impingement jets formed by apertures in a sleeve spaced a distance from the surface to be cooled. The sleeve is configured so as to duct spent impingement air towards the combustor, where it can be subsequently used for mixing with, and combustion of, the fuel, or for cooling of the combustor. The distance between the impingement sleeve and the transition duct surface is varied to control the velocity of air crossflow from spent impingement air in order to minimize the pressure loss due to crossflow. The cross-sectional areas of the apertures are varied to project impingement jets over the various distances and crossflow velocities. Generally, larger aperture areas are used with larger distances. The distance between the impingement sleeve and the transition duct systematically increases towards the combustor as the quantity of spent impingement air increases to a maximum value at the intersection of the combustor and the transition duct. The combination of variations in distance, aperture size, and inter-aperture spacing is utilized to vary the impingement cooling intensity to compensate for the variable internal heat load and also to produce the desired temperature distribution over the surface of the transition duct according to design requirements. The aforementioned variations are optimized to minimize the air flow pressure drop ahead of the combustion tem which achieving the required cooling intensity according to design requirements.
IPC 1-7
IPC 8 full level
F01D 25/12 (2006.01); F02C 7/18 (2006.01); F23R 3/00 (2006.01); F25B 9/00 (2006.01)
CPC (source: EP)
F01D 25/12 (2013.01); F23R 3/002 (2013.01); F05D 2260/201 (2013.01); F05D 2260/202 (2013.01); F23R 2900/03044 (2013.01)
Citation (search report)
- [AD] US 4339925 A 19820720 - EGGMANN JEAN, et al
- [A] GB 2112869 A 19830727 - WESTINGHOUSE ELECTRIC CORP
- [A] GB 849255 A 19600921 - JOSEF CERMAK
- [A] US 2873944 A 19590217 - WIESE THEODORE O, et al
- [A] US 3384346 A 19680521 - ALLAN HALLS GORDON, et al
- [AD] US 3652181 A 19720328 - WILHELM CARL F JR
- [A] FR 2221020 A5 19741004 - GEN ELECTRIC [US]
- [A] US 3806276 A 19740423 - ASPINWALL R
- [A] GB 2104965 A 19830316 - GEN ELECTRIC [US]
- [A] FR 2311176 A1 19761210 - BBC BROWN BOVERI & CIE [CH]
Designated contracting state (EPC)
CH DE FR GB IT LI NL
DOCDB simple family (publication)
EP 0203431 A1 19861203; EP 0203431 B1 19901122; EP 0203431 B2 19960522; AU 5735386 A 19861120; AU 593551 B2 19900215; CA 1263243 A 19891128; DE 3675690 D1 19910103; JP H0524337 B2 19930407; JP S629157 A 19870117; NO 162887 B 19891120; NO 162887 C 19900228; NO 861900 L 19861117
DOCDB simple family (application)
EP 86106295 A 19860507; AU 5735386 A 19860512; CA 507566 A 19860425; DE 3675690 T 19860507; JP 10690486 A 19860512; NO 861900 A 19860513