Double body turbofan engine, has high pressure compressor provided with external case, and internal inner fan duct cowl fixed on downstream end of external case, where air flow is circulated between external cowl and internal cowl

摘要

The engine has an axial centrifugal type high pressure compressor provided with an external case (124). An internal inner fan duct (IFD) cowl (122) is fixed on a downstream end (1242a) of the external case. An air flow is circulated between an external outer fan duct (OFD) cowl and the IFD internal cowl, where the internal cowl is made of metal i.e. titanium. A middle case (126) extends the external case in upstream. The external case holds axisymetric air sucking chambers.