Russian engineer invents a way to accelerate a civilian aircraft to 5500 km/h without overheating

An unusual patent for a new turbojet engine designed for stable operation at speeds exceeding 4.5 Mach numbers was registered in the official database of the Federal Institute of Industrial Property (FIPS) on February 20. The author of the development is engineer Vladimir Pismenny.

The new scheme solves the key problem of classical turbojet engines — the drop in compressor performance with increasing flight speed. This limits efficiency and thrust at high Mach numbers.

In the project, Pismenny used a turbocompressor with a reduced degree of pressure increase at the start, an air bypass channel between the cavities behind the compressor and the turbine with a shut-off device.

The main feature is the law of speed control. The rotor speed in flight varies proportionally to the square root of the air braking temperature at the compressor inlet.

More than 40% efficiency

At transonic speed, the engine increases the gas temperature in front of the turbine and bypasses more than 15% of the air past the turbine, simultaneously changing the critical nozzle section. This maintains compressor stability and thrust. An air-liquid scheme is used to cool the blades.

The stated characteristics are a flight speed of up to 4.5 Mach (about 5500 km/h), an overall efficiency of more than 40%, a single-shaft single-circuit layout and reduced noise during takeoff and landing. The development is focused on civilian and military supersonic aircraft.