Ten years of sharpening a sword: the independent breakthrough of the "heart" of domestic large aircraft
For a long time, the global civil aerospace engine market has shown a pattern that is highly concentrated and a duopoly. Under this pattern, the American and French giants have built strict barriers by relying on their technology accumulation, which has been accumulated for decades.
The core power of the C919 large passenger aircraft developed by COMAC is the LEAP-1C engine. Initially, it had to rely on CFM International, a joint venture between GE in the United States and Safran in France.
This situation called technology dependence is like the Sword of Damocles hanging overhead. There is a lesson in 2022. Russia's MS-21 passenger aircraft project has stalled due to supply chain interruptions. This lesson is always a reminder to the Chinese aviation industry that it must have independent and controllable domestic aviation engines.
Against this background, the research and development of the engine named CJ-1000A (Yangtze River-1000A) is tasked with breaking the shackles of power and achieving the national mission required to achieve technological breakthroughs.
Core Matrix: Performance parameters and technical advantages of Yangtze-1000A
The following is the rewritten sentence. The thrust coverage of this type of engine is approximately 13.5 tons, which is slightly lower than the 15-ton thrust J-1C. However, the thrust-to-weight ratio of this engine design is the ratio of thrust to its own weight, showing excellent performance and achieving a more compact and compact structural layout.
Among them, the high-pressure compressor represents a breakthrough in core technology, the combustion chamber also represents a breakthrough in core technology, and the high-pressure turbine also represents a breakthrough in core technology. These three parts are collectively called the "three hot-end components." In particular, the high-temperature resistance of turbine blades represents a breakthrough in core technology, and its pressure-bearing capacity also represents a breakthrough in core technology. Both of these directly determine the overall performance and reliability of the engine.
Research and development : technical breakthroughs from laboratory to test platform
The R&D process of Yangtze-1000A, which has spanned more than ten years, is a technological undertaking full of difficult challenges and complex breakthroughs. It involves countless hardships, continuous exploration and attempts, and a long-lasting and arduous process of overcoming difficulties.
Among them, the manufacturing of single crystal blades is recognized as a "stumbling block".
Domestic scientific research institutes, relying on precision casting technology, have developed nano-scale single-crystal alloy blades. The blades have a complex air film cooling structure, and are densely covered with micron-level cooling channels inside, just like extremely precise blood vessels. This ensures that the blades can work stably under extreme working conditions.
In addition, the precision of the fuel nozzle processing process has reached the micron level. Among them, for thousands of tiny holes, various flow control parameters have gone through thousands of simulation optimization operations, and this process has been verified by experiments. Ultimately, the goal is to ensure that the fuel can be atomized in an efficient state, so that the fuel and air can be fully mixed, thereby achieving the result of stable combustion.
Quality standards : Benchmark international airworthiness certification and reliability verification
The quality standards of civil aviation engines are extremely stringent. In this case, it must pass the type certificate (TC) issued by the Civil Aviation Administration of China (CAAC) to comprehensively verify its structural integrity and system reliability under various extreme conditions.
During the development process of the CJ-1000A, it went through a series of tests, including the bird impact test, the blade fly-out test called the containment test, the icing test, which is the icing test, and it also went through thousands of hours of durability testing.
Among them, a project called the blade fly-off test simulates the extreme working conditions of a fan blade breaking at extremely high speeds to test whether the casing can stably contain the broken blade and prevent fragments from penetrating the body. This is the ultimate test of the passive safety design of the engine.
These very strict and demanding testing procedures ensure that every domestic engine put into commercial operation in the future will have the safety standards to compete with international giants, as well as operational reliability, which is required when competing with the same international giants.
Industrial linkage : supply chain reshaping behind the rise of domestic brands
The "R&D" work carried out by "Yangtze-1000A" and the mass production stage it has entered are promoting a large-scale "high-end manufacturing industry chain" to achieve a comprehensive upgrade state, which is ongoing.
For example, in order to replace some imported materials in the initial design, domestic companies have accelerated the pace of increasing the production capacity of titanium-aluminum alloys, and also increased the production capacity of high-temperature alloys, thereby optimizing the process and optimizing the process. This is the case.
Such domestic substitution not only reduces the cost of engine manufacturing, but also cultivates a large number of technical teams that master core processes, thereby building a good ecosystem of industrial collaborative innovation.
According to the planning arrangement, the annual production capacity of CJ-1000A will be gradually released in the final stage of the "14th Five-Year Plan", thereby providing a stable source of power for the batch delivery of C919 and completely changing the situation where key components are restricted by others.
Market Confidence: Installed Application Prospects and Domestic Product Credibility
Recently, Zhang Yanzhong, an academician of the Chinese Academy of Engineering, publicly revealed positive progress. He is a core expert on the CJ-1000A project, which has greatly boosted confidence in domestic aviation engines both inside and outside the industry.
The market has general expectations that after completing all airworthiness certification work around 2025, the Yangtze River-1000A will gradually replace the LEAP-1C and become one of the many optional power supplies for the C919 series passenger aircraft.
This change is not just a replacement at the product level, but also proof of the quality of domestic brands moving forward from "available" to "easy to use".
This technological breakthrough that has lasted more than ten years will eventually accumulate into a key core asset for China's aviation industry to rely on its own innovation.
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