ANALYSIS: AFRL prepares to unveil 20-year propulsion vision

Since the arrival of the high-bypass turbofan almost 50 years ago, engineers have made huge strides in jet engine efficiency without altering the basic architecture. Two air flows of constant volume either bypass or enter a core section. The core combusts a mixture of compressed air and fuel to generate thermal energy, which is then converted to supply some of the aircraft’s thrust and most of the power.

See the full article at stlbeacon.org