CR929 passenger aircraft is a new generation of wide-body passenger aircraft developed by China and Russia for the civil aviation market in 2020. As new passenger aircraft (such as Boeing 787 and A350) have appeared in this field, the competition is fierce, requiring CR929 passenger aircraft to have better economy and reliability, and correspondingly higher requirements for engines. Therefore, when the relevant departments developed CJ2000, they adopted a series of new technologies to improve engine performance, including composite blades.
Recently, it has been reported that AVIC Hi-Tech has made considerable progress in the use of composite materials and completed the development of composite blades for CJ2000 turbofan engines, which marks the development of domestic aeroengines. Another technological breakthrough. According to relevant sources, CJ2000 is a new generation of domestically-made civil aviation engine, which should be the development type of domestically-made CJ1000 engine. It may be an engine that supports domestic-made CR929 passenger aircraft.
For passenger aircraft, the best way to improve economy and reliability is to reduce structural weight, which depends largely on the engine. Modern airliners are equipped with large ducted turbofan engines, and the weight of the fan part accounts for 40% of the total weight of the engine. In this way, reducing the weight of the engine fan can effectively reduce the weight of the entire engine and further reduce the weight of the passenger aircraft structure. According to relevant data, the weight of the fan blades of modern large tubular turbofan engines has been reduced by 1 kg, and the transmission system and casing have also been reduced by 1 kg. The weight of the engine is reduced by 1 kg, and the total weight can be reduced by 1 kg. It can be said that the effect is very obvious. Therefore, the new generation of large-scale ducted turbofan engines abroad use composite fan blades.
The maximum take-off weight and passenger capacity of the CR929 passenger plane is equivalent to the maximum take-off weight and passenger capacity of the Boeing 787 passenger plane. Therefore, the size and parameters of the CJ2000 engine should be equivalent or similar to those of GE Corporation GENX in the United States. The latter's fan has a maximum diameter of 3 meters and uses wide-chord sweeping blades made of carbon fiber reinforced epoxy resin composite material. In order to improve the ability to resist the impact of foreign objects, the leading edge of the blade is made of titanium alloy. It is very difficult to develop such a fan blade, but the advantages are also very obvious. It can reduce the weight of the fan part of the CJ2000 by about 200 kg, plus the transmission system and casing can reach 500 kg. Overall, the engine has been reduced by 500 kg, and the wing/body structure has also been reduced by 500 kg. In this way, the weight of the CR929 passenger aircraft structure is expected to save about 1 ton, thereby ensuring the economy and reliability of the aircraft.
Since the diameter of the CJ2000 large ducted turbofan engine fan is the largest among aero engines, it is also the most difficult. Therefore, we have mastered the composite blade technology of the CJ2000 engine, and the popularity of composite fan blades in civil aviation engines is just around the corner.
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