What is the assembly situation of the first verification machine for domestic passenger aircraft engines?

The first verification machine of domestic passenger aircraft engine was assembled, breaking through a number of key technologies.

According to the official website 65438+February 29th news of the Ministry of Industry and Information Technology, the first domestic engine verification machine (CJ-1000AX) was assembled in Shanghai on the 25th. On that day, the core engine of this engine achieved stable operation at 100% design speed in Shanghai. The first verification machine broke through a number of key technologies, including 3D printing of combustion chamber fuel nozzles.

Screenshot of Ministry of Industry and Information Technology website

According to official website news from the Ministry of Industry and Information Technology, 20 17 1000 AX, the first large passenger aircraft engine verification machine (CJ- 1000AX), was finally assembled in Shanghai, marking the establishment of the first civil turbofan engine verification platform in China, which will lay a solid foundation for subsequent research and development.

CJ- 1000AX was developed by China Hangfa Group Shangfa Company, with a diameter of 1.95m and a length of 3.29m Its structure is complex and it is difficult to trial-produce, including fan/booster stage, core engine, low-pressure turbine and accessory gearbox device, and it consists of nearly 35,000 components.

The commercial development company of China Hangfa Group adopts the development mode of "main manufacturer-supplier" and cooperates with 24 companies to participate in trial production. It has successively broken through many key technologies of trial production, such as titanium alloy wide chord high altitude heart rate fan blade, aluminum alloy large thin-walled fan casing, 3D printing combustion chamber fuel nozzle, etc., and also overcome the technical difficulties of horizontal assembly of large-diameter long-shaft units. It took 18 months to complete the trial production and assembly of the first complete machine.

The first assembled CJ- 1000AX machine.

In addition, the website of the Ministry of Industry and Information Technology reported on the same day that on the 25th, the core engine of the large passenger aircraft engine verification machine (CJ- 1000AX) achieved stable operation at 100% design speed in Shanghai, which provided strong support for further in-depth test verification.

The core engine consists of high-pressure compressor, combustion chamber, high-pressure turbine and related systems. The actual working temperature, pressure and rotating speed are extremely high, and its technical complexity and difficulty represent the highest level in the mechanical field. The main purpose of core machine testing is to verify the performance, function and matching of all components and related systems, expose problems in advance and reduce the development risk of the whole machine.

The core engine test lasted for 39 days, and 46 test runs were carried out, which preliminarily verified the performance, function and matching of the core engine components and related systems. At the same time, the technologies of compressor cylinder prediction, combustion chamber ignition prediction, turbine working state analysis and "skeleton characteristics" performance simulation model developed for the first time in China are verified, which effectively supplement and enrich the development system of core engines.

The LEAP- 1C engine currently used in C9 19 was developed by CFM International, a joint venture between the United States and France.

According to the introduction of "Double Engine Power Control" on WeChat, foreign aviation media Flightglobal believes that the success of CJ- 1000 engine will have a commercial impact on the LEAP- 1C engine of CFM International (a joint venture between GE of the United States and Safran of France). At present, LEAP- 1C engine is the only power engine of C9 19 engine.

LEAP- 1C engine related data

In addition, in appearance, CJ- 1000AX has a diameter of 1.95m (76.8 inches) and a length of 3.29m (10.7ft). In contrast, the diameter of Leap- 1C is1.98m and the length is 3.32m. CJ- 1000AX is shorter, probably because CJ- 1000AX is shorter than LEAP-1C. Therefore, the low-pressure turbine of CJ- 1000AX is 6 stages, while the Leap- 1C engine is 7 stages.

Flightglobal also believes that there is still a big gap between China and the West in the application of advanced technology in commercial engines. A typical example is CJ- 1000A, which uses Rolls-Royce hollow titanium alloy wide chord fan blades instead of the gear transmission structure similar to that of Pratt & Whitney or the carbon fiber composite fan blades used by CFM.

Engine has always been the main bottleneck restricting the development of China's aviation industry, and it is also the shortcoming of the country's development of large passenger aircraft. If the problem of "China Heart" cannot be solved, China's aviation industry will not be a complete and independent system. Therefore, shortly after China started the large passenger aircraft project, AVIC Commercial Engine Co., Ltd. was established to develop the power system for domestic passenger aircraft.

According to "Big Aircraft" magazine, Ni Jingang, a senior expert of AVIC Business Development Center, introduced the development progress of domestic engines to the participants at the 20 14 China Aviation Propulsion Technology Summit Forum.

Ni Jingang said that the company is developing CJ- 1000AX verification machine. At present, the plan is to complete the development and debugging of the verification machine in 20 18, and at the same time, to continuously improve the technology of components, systems, processes and materials for several rounds to ensure that the engine meets the technical requirements of C9 19 large passenger aircraft. If all goes well, CJ 1000-A engine will be equipped with C9 19 large passenger plane in 2022, and CJ 1000-B engine will be equipped with C9 19 extended-range passenger plane in 2026.

In terms of serialization development and airworthiness forensics, CJ- 1000 series that AVIC Commercial Aircraft plans to use for narrow-body passenger aircraft will achieve the certificate machine standard in 20 18, and complete airworthiness forensics in 2022 ~ 2025; CJ-2000 series wide-body passenger aircraft plans to complete the technical pre-research in 2020, the test and verification machine will reach the standard in 2022, and the airworthiness certification will be completed from 2025 to 2030. As for CJ-500 series small regional aircraft, Ni Jingang said that due to the limited market demand at present, it will not be launched in the short term.