Chapter 1445: Proper competition

A few days after the successful first flight of C919, Tan Zhenhua left the magic city and flew to Xijing, where another plane was about to fly for the first time.
According to the pedigree of this aircraft, it was logically called "BACII" since the day the project was established. British BAE, the main development participant besides China Commercial Aircraft Corporation, also liked this name very much, and they even asked for a joint formation. A joint venture company is responsible for the development and sales of this aircraft.
However, Tan Zhenhua has always insisted that the project must be led by China Commercial Aircraft Corporation. The role of BAE is the main contractor of the joint development party, flight control system and airborne electronic equipment. His insistence once attracted the then CEO Xiaohuo. Ke was very dissatisfied.
But today, when Little Hawke saw Tan Zhenhua again, he had to admit with emotion that now it seems that his persistence back then was correct.
Due to well-known reasons, BAE interrupted its support for the project for a while, resulting in the "BACII" project having to be stalled for more than a year. Fortunately, Tan Zhenhua had anticipated this matter and deployed it secretly many years in advance, and he supported it. , China’s entire aviation system has been activated, carefully analyzed and studied the sub-systems and equipment imported from BAE, and invested heavily in organizing technical research, and has achieved more than 1,000 research results, and basically achieved Thanks to the localization of the flight control system and on-board electronic equipment, these subsystems gradually matured and finally allowed the "BACII" project to be restarted.
Of course, at this time, there is no need for this aircraft to use the name "BACII" in order to respect the feelings of BAE. Tan Zhenhua has a new name for this aircraft: "ARJ21-70", ARJ21 is the English name "AdvancedRegionalJetforthe21stCentury" The abbreviation for, means the new generation of regional jet airliner in the 21st century.
Okay, Tan Erai’s plagiarism is committed again...
ARJ21-70 has a wingspan of 28.08 meters, a length of 27.88 meters, a height of 8.51 meters, a cross-sectional diameter of the cabin 3.10 meters, a typical empty weight of 22,673 kg, a commercial load of 9,300 kg, a maximum take-off weight of 36740 kg, and a maximum landing weight of 34,020 kg. Two Luos are used. Luo produced a 5.7-ton
Thai
620 engine powered by a classic tail-lift layout and a standard layout of 73 passengers (8 seats in the executive cabin with 91 cm 2+2 layout, 65 seats in the economy cabin with 81 rows Cm 2+3 layout), typical use range is 2850 kilometers, maximum use speed Mach 0.77, economic use speed Mach 0.73, practical ceiling 10670 meters, double cockpit, flying noise 83.4 decibels, approach noise 93.4 decibels, lateral The noise is 89.3 decibels, in line with the latest emission and noise standards in Europe and the United States, and it can take off and land almost unlimitedly in airports in various regions and major hubs around the world.
This is a standard regional airliner, and benefited from the progress of China Composites. During the development process of the aircraft, a large number of carbon fiber and glass fiber composite materials were used in the non-structural load-bearing area, and the total use of composite materials reached 15%. %, while ensuring the strength of use, the weight of the body is greatly reduced.
Need special explanation here, Luo. The "Thai" engine produced by Luo Company is actually a large bypass ratio civilian model developed under the same core engine of the "Speey" MK555 engine. It has a bypass ratio of 3 and a thrust of 5.7 tons. A cousin with greater thrust, "Thai" 650, has a thrust of 6.8 tons. The Xijing plant is very familiar with the MK555 core engine. The RB168-Mk807 ​​engine was also developed on this core engine and eventually developed into a " The
Huashan
engine has become the heart of the
Fierce Dragon
fighter. Therefore, Tan Zhenhua is also comfortable with Luo. Luo reached another agreement that the "Thai" 620 engine installed on ARJ21-70 will be licensed for production at Xijing Aviation Development Plant.
This time he did not want to transfer the technology, because at the same time, the Gas Turbine Institute is organizing forces to carry out technical research on the basis of MK606, and use it with Luo. Luo has mastered the technology, experience, design specifications and processes in the two design cooperations and the latest achievements of China Huaxia in the field of materials and processes in the past few years to develop an engine with a large bypass ratio!
As mentioned in the previous article, the Gas Turbine Institute has been advancing a "high-promotion pre-research" project since the early 1980s, and when Tan Zhenhua and Liu Daxiang started a full range of cooperation, they also "inadvertently" in a certain exchange. He heard about the matter and immediately expressed his willingness to invest a portion of the funds to obtain the civilian direction authorization of the subject. After his participation, the
high-precision pre-research
project completely got rid of another dilemma that has been plagued by insufficient funds in time and space. Plus and Luo. The various experiences learned in the Luo cooperation, in this time and space, the advancement of the "high-promotion pre-research" has been much smoother. The development of the core machine, which should have been started at the end of 1990, has been advanced by more than one year, and it is expected that this year Before the end of the year, the first core machine will be assembled and enter the local interview car stage-this will also be one year earlier than the previous time.
In addition to this "pre-research" project, the Gas Turbine Institute and Xijing Aero Engine Factory are the main participating units, hosted by Liu Daxiang and Li Mengzhen, and there are also several secondary developments on the basis of "Speey". The project is also gradually advancing, the most important of which are: the national production material substitution and weight reduction of the "Qinling" engine, the national production material substitution and weight reduction of the "Huashan" engine, and the imported "MK606" "Develop a project for engine development with a bypass ratio of 5 and engine FADEC management.
FADEC, which means full authority digital engine control, is to increase the reliability and efficiency of the engine. When combined with the sub-system of the aircraft, it controls and manages the full authority of the engine in a fully digital manner to achieve a stable and transient engine characteristic.
Looking at the explanation of this term, you can know that this is a revolutionary change in the management and operation mode of the engine from the traditional "mechanical-hydraulic" to "electronic-software". Compared with the traditional engine hydraulic control system, the realization of the control law mainly depends on space. For cams with complex curved surfaces and extremely difficult machining and hydraulic systems that drive cam actions, FADEC realizes the control law algorithm is much simpler, just turn the formula into code for processing, so it can not only reduce the weight of the engine , The hydraulic cam control system with high processing difficulty can also greatly improve the control accuracy, and the action of the engine will be more timely. It can also monitor the working status of the engine components in real time and extend the service life.
These are undoubtedly huge investment projects, but at this time, the Gas Turbine Institute and Xihangfa provided engine upgrades for F4 fighters and F14 fighters for Ibos, and provided supporting engines for "Flying Leopard" and "Fierce Dragon". Yes, the money in the pocket is more, and this has formed the "siphon" effect of talents. However, all domestic college students who majored in aeroengines will regard entering these two companies as the first choice for careers after graduation, so that at this time Zhang Enhe, the chief engineer of the Yihang Power Research Institute, who is responsible for the development of another domestically-made key model engine, has repeatedly complained to Liu Daxiang that he "digging the wall."
Digging the wall or something, Tan Er is just a deaf ear. He knows that the reason why the Americans can get a far leading position in the aero engine industry is the competition between Pratt & Whitney and General Motors for the F15 fighter. The "engine war" also has a great relationship. In order to compete for this order, the two companies burned the same amount of money on aero engines, which also laid the foundation for the United States' advanced technology in the field of aviation development-this is competition. The benefits.
Appropriate competition is one of the sources of motivation to keep the scientific research team and the enterprise moving forward, so Chief Zhang Enhe, you have to come on. It is too slow to build a "Taihang" in 30 years!