The new PD-8 aircraft engine for the first time incorporated a supersonic high-pressure turbine stage with a pressure ratio of 4. This was reported by blogger SkyExpert.
According to him, this indicator is comparable to the technologies of the Leap-1 engine, which is used on modern Boeing 737 MAX and Airbus A320neo.
The SaM146 had a pressure ratio of 3.6 on a single-stage HPT.
This refers to the high-pressure turbine. The higher the pressure ratio, the more efficient the engine, but the greater the load on the blades, bearings, and the entire gas generator. Now the main question is: will the Russian engine be able to maintain its service life under such loads?
Let's hope that this degree will not destroy the engine after a couple of thousand flight hours.
The author also recalled that resource problems previously arose with the SaM146 engine, created for the Sukhoi Superjet 100. At the same time, the Western Leap-1 actually grew out of SaM146 technologies, while Russian engineers had to create their own solutions for the PD-8 almost from scratch.
ODK head Alexander Grachev explained that technologies that did not exist in Russia before were created for the PD-8. Thanks to this, the specific fuel consumption of the power plant was reduced.