Adaptive vertical lift engine (AVLE) fan

A turbofan engine comprising:

• a first fan in fluid communication with a core stream and a bypass stream and configured to compress the core stream and the bypass stream;
• a core compressor portion configured to compress the core stream;
• a core turbine portion connected to a shaft and configured to:
• heat and expand the core stream, and
• drive the first fan and the core compressor portion;
• a midspan partial shroud disposed on the first fan and extending axially forward from proximate a trailing edge of the first fan to at least a midchord of the first fan;
• a downstream splitter, wherein
• the midspan partial shroud and the downstream splitter are configured to separate the core stream and bypass stream;
• an additional splitter;
• a first seal disposed between a trailing edge of the midspan partial shroud and a leading edge of the downstream splitter, wherein the first seal is configured to restrict flow between the core stream and the bypass stream;
• a second fan disposed upstream of the first fan and comprising a second midspan partial shroud extending axially from a trailing edge of the second fan to at least to a local midchord of a blade of the second fan but short of a leading edge of the second fan;
• and
• a second seal connecting a trailing edge of the second midspan partial shroud with a leading edge of the additional splitter.