Jet engine with compressor driven by a ram air turbine

In a jet engine comprising:

• a. an elongated annular outer casing having a central longitudinal axis, a substantially open forward end and a substantially open, rear nozzle end,
• b. an elongated annular inner casing coaxially disposed within said outer casing and having a substantially open forward end and a substantially, rear nozzle end,
• 1. said inner casing forward end being smaller than said outer casing forward end and forming a first air intake for said inner casing;
• c. said outer casing being radially spaced from and defining an elongated annular air passage with said inner casing which extends between said ends thereof,
• 1. said inner casing forward end forming with said outer casing a second, annular air intake for said air passage,
• 2. said outer casing nozzle end being larger than and spaced rearwardly from said inner casing nozzle end whereby combustion gasses exhausted from said inner casing nozzle end cause rearward air flow in said air passage by Venturi action;
• d. a fan and compressor assembly rotatable about said axis and having radially inner compressor vanes connected to radially outer motor fan vanes, and rotated thereby,
• 1. at least one group of said fan vanes being disposed in said second air intake whereby said air flow in said air passage causes rotation of said fan and compressor vanes,
• 2. at least one group of said compressor vanes being disposed in said first air intake whereby rotation of said compressor vanes forces air under pressure rearwardly through said inner casing;
• and
• e. means for burning fuel disposed in said inner casing rearwardly of said compressor vanes;
• the improvement wherein:
• i. said inner casing has a first section which converges rearwardly from said first air intake to a rear end smaller than said first air intake;
• ii. said inner casing has a second section with a forward end connected to said first section, said second section extending rearwardly from said first section to a rear end which is no larger than said forward end,
• 1. said fuel burning means being disposed in said second section;
• iii. said inner casing has a rear section with a forward end connected to said second section, said rear section extending rearwardly from said second section to said nozzle end thereof
• iv. said fan and compressor assembly includes an annular wall rotatable therewith and which diverges rearwardly in said annular passage from said second air intake to define a rearwardly converging air intake duct with said outer casing,
• 1. all of said fan vanes being connected to said wall and extending radially outwardly therefrom,
• 2. said one group of compressor vanes having a connection with said wall and extending radially inwardly therefrom.