How far the gap between China's aeroengines and the rest of the world is is a difficult question to answer. China's existing Taihang engine is the equivalent of a U.S. F-110 engine in the late 1980s and early 1990s.
But from another point of view, the gap may be as long as 60 years, which is not simply a performance indicator, but reliability and maintainability, because all of China's military jet engines, whether turbojet or turbofan, are no match for a British turbofan engine 60 years ago.
From the perspective of the development history of turbofan engine, the SB engine is not very complete, and the design of this engine by Luoluo Company is very lack of experience. This two-shaft turbofan engine has the maximum thrust ton, the weight is up to ton, and the thrust ratio is low. Only, the biggest advantage is that the fuel consumption is relatively low, which is about 20%less than that of the vortex jet used in China, and the maximum thrust is more than 2 tons.
The world's biggest criticism of Rollo is that the engine is good, that is, it enjoys super-complex structures, and the Sby engine is unprecedentedly troublesome, employing a 5-stage fan, a 12-stage high-pressure compressor, a two-stage high-pressure turbine, a two-stage low-pressure turbine, which is more complex than any other engine of its time.
To what extent has the word of mouth been good, the Chinese air force had access to the Russian state-of-the-art fighter jet Su-27's engine AL-31F in the 1990s, and by the beginning of the use of the Sby engine in 2000, soon realized the huge gap, the Russian engine thrust is the biggest advantage, but the Russian engine designers almost completely ignore the aircraft maintenance problem, although the Russian engine is much simpler than the Sby's engine structure, but also less than three parts, but often encountered a lot of trouble to disassemble the engine, giving an anti-human label.
The reason is that the sbe engine in the design of the consideration of disassembly and maintenance is relatively perfect, although the number of aircraft parts is particularly large, but very easy to disassemble, very fast, and installation and commissioning is not troublesome, on this point, china's own research and development of the taihang engine cannot catch up.
The reason is that this is the British civil aviation engine modified military engine, and the civil engine in addition to fuel saving, but also put forward a very high demand for engine reliability and repairability, any engine is not easy to repair, the downtime will be much more than expected, each additional hour the airline will lose a lot of money, almost will be rejected by the airline, this is a rigid indicator!
Russian aero-engine designers, why not design a good repair of the engine, this problem is easy to explain, roro engine designers, need to personally take the next stage to repair their own design of the engine, will not sit in the office drawing, good repair, designers to taste, their own acceptable customers can accept!