Design
Like the RB545, the SABRE design is neither a conventional rocket engine nor jet engine, but a Precooled Hybrid Air Breathing Rocket Engine that burns liquid hydrogen fuel combined with an oxidant of either compressor-fed gaseous air or stored liquid oxygen fed using a turbopump.
At the front of the engine a simple translating axisymmetric shock cone inlet slows the air to subsonic speeds using just two shock reflections.
Part of the air then passes through a precooler into the central core, with the remainder passing directly through a ring of bypass ramjets. The central core of SABRE behind the precooler uses a turbo-compressor run off the same gaseous helium loop Brayton cycle which compresses the air and feeds it into four high pressure combined cycle rocket engine combustion chambers.
Read more about this topic: SABRE (rocket Engine)
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