As we all know, the domestic large aircraft C919 is the pride of the mainland's civil aviation industry. But in order to make it truly independent and controllable, it has to rely on domestic CJ1000A engines to match. This large bypass turbofan engine is not a simple role, it is responsible for giving wings to the C919.
The most important component in an engine is the blades. In the past, CJ1000A used metal blades, mainly titanium alloys. It took the mainland ten years to get this thing done.
The researchers of the Institute of Metals of the Chinese Academy of Sciences worked day and night, and finally improved the strength and weight ratio of the blades, and everyone thought that they could breathe a sigh of relief.
I never thought that with the rapid development of science and technology, the world has long abandoned titanium alloys and turned to the arms of composite materials. The blades made by people with this new material are called advanced, and the titanium alloy is compared. CJ1000A finally got titanium alloy blades, and in a blink of an eye, they became the yellow flowers of tomorrow.
Why are composite blades so powerful? This is not simple, there are ~ high strength, good rigidity, high temperature resistance, not easy to fatigue, can resist damage, a lot of advantages. With it, the performance of the engine has gone up, and it is more economical and environmentally friendly. In this comparison, CJ1000A continue to use titanium alloy, isn't that self-deprecating? Therefore, it is imperative to develop composite blades.
Continental has been working on composite blades since 2011. This thing is a deep level of knowledge, material science, manufacturing technology, none of them can be sloppy. Over the years, China has been holding back its efforts in this regard, but there has been no breakthrough. The scientific research personnel have sad faces, and CJ1000A can only look at the "material" and sigh.
Just when everyone was at a loss, a dark horse emerged - Xinyang New Materials Company in Yangzhou, Jiangsu. This private enterprise quietly made a high-strength composite material, which directly gave the CJ1000A blades a big transformation!
First of all, let me give you a popular science, the raw material of this composite material is called T1000 grade carbon fiber, which is the top product. It weighs only 0.5 grams per meter, but can carry 500 kilograms of force. A bundle of finger-thick carbon fibers can be used to drag two planes. The composite material made by Xinyang New Materials with this carbon fiber has better performance than T1000.
This new material is light, strong, hard, and not afraid of high temperature and corrosion, and it is simply invincible. Using it as a blade, the weight of the aircraft has decreased, the acceleration performance has risen gradually, and the oil has been saved a lot, and the emission reduction effect is excellent. The comfort of the aircraft has also improved, the noise is reduced, and the anti-vibration ability is stronger. This series of benefits, how can other materials compare?
Replacing the CJ1000A with composite blades is not the final victory. If the engine wants to be attached to the C919, it must first get the airworthiness certification, which is not easy. In order to prove that it is safe and reliable, it must pass five levels and cut six generals: life, vibration, performance, fuel consumption, exhaust emissions, and resistance to harsh environments. The certification cycle is often several years, and the longest is more than ten years. No wonder CJ1000A always "only hear the sound of the stairs, but no one comes down".
In addition to being the exclusive engine of the C919, CJ1000A equipped with this composite blade, it can also be the "heart" of other aircraft. The ARJ21 regional airliner uses a domestically produced turbofan-10 engine, and if it is replaced with a CJ1000A, the performance will have to jump up a lot.
The Y-20 large transport aircraft is equipped with an imported engine, and it can also be improved a lot if it is replaced by a domestic one. Of course, that's all for later.