China kept the S-70C operational for about three decades after sanctions in 1989. You cannot do that without being able to supply every part locally, engine included.
Chinese Engine Development
- Thread starter jackbh
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China kept the S-70C operational for about three decades after sanctions in 1989. You cannot do that without being able to supply every part locally, engine included.
this is an interesting area to be looking into. Looks like carbon fiber/SiC composite are the best material.
Looks like the high end carbon ceramic brakes use this type of material.
They’ve been working on these for a few years (I started doing research paper dives during the pandemic) now but fatigue tolerance is still an open issue for use in turbines. We saw a single piece 3D printed CMC compressor blisk fly on a tiny demonstrator maybe two years ago. But still remains to be seen how they would perform in the high pressure hot section where their temperature tolerance properties are most suited.
GE widely adopts ceramic composite on it's XA100 engine
GE公司在XA100发动机中广泛使用陶瓷基复合材料
2022年4月11日，GE航空公司的XA100自适应循环发动机旨在升级F-35战斗机，同时为美国空军第六代战斗机计划——“下一代空中优势”（NGAD）提供动力。
下一代发动机的关键组成部分是陶瓷基复合材料（CMC），目前已经广泛应用在世界各地的商用发动机中。GE公司拥有业界第一个也是唯一一个集成的CMC供应链，已经生产了数十万个这样的部件。与传统的金属材料相比，CMC在三个方面有利于发动机的性能：耐热性、重量和耐久性。2021年，GE公司配装在CFM LEAP发动机热端的CMC涡轮护罩的飞行时间超过了1000万小时，生产数量超过十万个。据悉，世界上最大的商用发动机GE9X热端配装了五个不同的CMC部件。
这种商业上的成功促使工程师和项目负责人看好CMC及其对GE军用新发动机的影响。
XA100发动机可在大推力和高效率模式之间切换，使其能够适应军用飞机在空中可能遇到的任何情况。该机2020年12月首次点火试车，成为第一台三流道自适应循环发动机。XA100是所有商用或军用发动机中使用CMC最广泛的，这种部件有助于减轻重量、提高热效率，并创造了压气机和涡轮组合温度最高的世界纪录。
GE公司还在F414发动机中运行了世界上第一个旋转的CMC叶片，通过1000次试验验证了该材料承受高性能军用发动机内环境的能力。
对于像F-35这样的战斗机，在高温和恶劣条件下提高耐久性是至关重要的。GE公司研究中心的研究人员曾进行过使用钢球撞击CMC和非CMC板的对比试验，并用相机拍摄试验，验证了CMC部件的韧性。
GE Aviation’s XA100 adaptive cycle engine is designed to upgrade the F-35 fighter jet while also powering the U.S. Air Force’s sixth-generation fighter program, Next Generation Air Dominance (NGAD).
A key component of the next-generation engine is ceramic matrix composites (CMCs), which are already widely used in commercial engines around the world. GE has the industry’s first and only integrated CMC supply chain and has produced hundreds of thousands of these parts. Compared with traditional metal materials, CMCs benefit engine performance in three ways: heat resistance, weight and durability. In 2021, GE’s CMC turbine shrouds installed on the hot end of the CFM LEAP engine exceeded 10 million flight hours and produced more than 100,000. It is reported that the hot end of the GE9X, the world’s largest commercial engine, is equipped with five different CMC parts.
This commercial success has prompted engineers and project leaders to be optimistic about CMCs and their impact on GE’s new military engines.
The XA100 engine can switch between high-thrust and high-efficiency modes, allowing it to adapt to any situation a military aircraft may encounter in the air. The first ignition test of the aircraft in December 2020 became the first three-flow adaptive cycle engine. XA100 is the most widely used CMC in all commercial or military engines. This component helps reduce weight, improve thermal efficiency, and set a world record for the highest temperature of the compressor and turbine combination.
GE also ran the world's first rotating CMC blades in the F414 engine, verifying the material's ability to withstand the environment inside a high-performance military engine through 1,000 tests.
For fighter jets like the F-35, improving durability under high temperatures and harsh conditions is critical. Researchers at GE Research Center have conducted comparative tests using steel balls to hit CMC and non-CMC plates, and filmed the tests with cameras to verify the toughness of CMC parts.
CMCs are not quite the same as straight up ceramics.
To me, a good analogy is 'reinforced concrete' where concrete = ceramic and composite = steel rod.
APA130 auxiliary power unit Model present in airshow. This is for C929.
APA130 auxiliary power unit chief designer is a woman her name is Shan Xiaoming. its really good to see, women are contributing in this complex field. first we have WS-19 chief designer and now this..
APA130 auxiliary power unit chief designer is a woman her name is Shan Xiaoming. its really good to see, women are contributing in this complex field. first we have WS-19 chief designer and now this..
It makes me wonder how much something like you'd put on a BYD vehicle as brakes would differ from something you'd use in a turbofan engine. I'm sure the requirements inside turbines would be higher. But this is one area where since it's still a relatively new field, China can get to the front relatively quickly.
