Gas turbine engine transitions comprising closed cooled transition cooling channels

Abstract

A transition () for a gas turbine engine () comprises a transition wall () comprising cooling channels (L,R,L,R) that are adapted to pass a cooling fluid, such as compressed air from a compressor () during operation of the gas turbine engine () so as to cool combusted hot gases passing through the transition (). For each cooling channel (L,R,L,R), respective entry ports (L,L,L,R) and exit ports (L,R,L,R) are arranged so as to obtain a performance improvement based upon pressure differentials between the respective entry and exit ports. In various embodiments, a scoop () is associated with an entry port (L,R) so as to establish a more elevated pressure differential in the respective cooling channel (L,R). An entry port (-) may be positioned offset relative to a lower-positioned exit port (-) so as to so minimize or eliminate intake of heated airflow from a respective nearby exit port (-). Such offset positioning may be based on the airflow paths and cooling requirements at selected high-temperature operating conditions.