The new Russian passenger supersonic aircraft should fly at a cruising speed of Mach 1.8-2.0 and have a range of up to 8.5 thousand km. The engine for it is incomparably more complex than those on supersonic fighters, explained Andrey Kozlov, General Director of the Central Institute of Aviation Motor Engineering named after P.I. Baranov.
According to him, civil supersonic aircraft differ in operating modes and duration of supersonic flight.
Hence the different approaches in creating, designing, developing, and arranging power plants. For example, a fighter only needs to go into afterburner for a very short time and complete a combat mission. And a civilian takes off and gets on the march.
Kozlov added that the new engine for the passenger aircraft should develop a speed of up to 2500 km/h in cruising mode and operate 70-80% of the flight time practically at the limit of its capabilities.
There is another important nuance: noise in the airport area. In military aviation engines, the largest percentage of acoustic disturbance is created by the jet stream. To minimize the impact, it is necessary to reduce its outflow velocity. And this is only possible by increasing the bypass ratio. On the other hand, to overcome the sound barrier, the engine must have a high specific thrust, and this is, on the contrary, a low bypass ratio.
Kozlov stated that the laws of physics have not been canceled, so we are talking about absolutely contradictory tasks here.
But it is their solution that will reduce the flight by 7-8 thousand km to 4-5 hours, compared to subsonic machines, which take more than ten hours for this distance.
Prior to that, Kozlov explained why the gas generators of the PD-8 and PD-14 engines are not suitable for the power plant for a promising supersonic aircraft.
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