Advanced Seals and Secondary Airflow Systems for Allison AST

The author will present results obtained to date of a secondary flow study currently being conducted. The purpose of the study is to investigate and report all the ramifications of introducing advanced sealing technology into gas turbine engine secondary flow systems. In addition to detailed cost/benefit results we will also derive seal operational requirements which can be fed into a subsequent advanced seal development program. Using the current Allison AE3007 engine as a model/baseline we have examined 6 different advanced seal variations. We have settled on a design with 2 advanced seals which results n a savings of 2% in chargeable cooling. The introduction of these advanced seals has resulted in substantial changes to surrounding engine components which will be reported.