I'm sure you've paid attention to the news that the C919 passenger plane is about to make its first flight recently. But why does the appearance of this large passenger plane attract the attention of the whole country and even the whole world? Is it just because it has gone through eight years of hard research and development? I don't think so. Next, let me make a comprehensive interpretation of the appearance of C919 passenger plane.
(Photo courtesy of Comac China)
Why is the passenger plane named "C919"?
C919 is the first trunk civil aircraft developed in China according to the latest international airworthiness standards. Development began in 28, and it is planned to obtain airworthiness certificates and deliver them to users in 216. Mbth is COMAC C199. COMAC stands for Commercial Aircraft Corporation of China, the manufacturer of this aircraft. C in C919 is the initials of China and COMAC. The first "9" means everlasting, and "19" stands for the maximum capacity of China's first medium-sized passenger aircraft of 19 seats. In addition, C in C919 has another meaning, which shows that C919 competes with the initials A of Airbus and B of Boeing for the heart of the blue sky.
the p>C919 has 155 basic mixed-level layout, 169 full economy class layout and 175 high-density layout. C919 belongs to the same class as Boeing 737 and Airbus A32: the payload is 2.4 metric tons; The cruising speed is Mach .785; The maximum flying height is 12,1 meters; The standard range is 475 kilometers, and the increased range is 5555 kilometers; The economic life reaches 9, flight hours.
(Photo courtesy of Comac China)
Comparing with other large aircraft, showing strength
If we want to know the strength of C919, then comparing with Boeing 737 is a good way.
fuselage height C919:4.166, B737:4.1 ..
C919 length: 38.9 meters, B737 length: 39.5 meters.
C919 wingspan: 33.6m, B737 wingspan: 35.79m..
flight speed of p>C919: 9km/h, maximum range: 5555km, flying altitude: 121km. The flight speed of B737 is 828km/h, the maximum range is 5765km, and the flying altitude is 125km.
after comparison, it is not difficult to find that the C919 passenger plane is fully capable of competing with the world-famous passenger plane, and its strength is strong!
(The picture is provided by Comac China)
What is the design technology of p>C919?
1. Advanced aerodynamic layout and new-generation supercritical airfoil and other advanced aerodynamic design technologies are adopted to achieve better cruise aerodynamic efficiency than similar aircraft in active service, and the cruise aerodynamic efficiency is equivalent to that of competitors in the aftermarket for ten years;
2. adopt advanced engines to reduce fuel consumption, noise and emissions;
3. adopt advanced structural design technology and a large proportion of advanced metal materials and composite materials to reduce the structural weight of the aircraft;
4. adopt advanced fly-by-wire control and active control technology to improve the comprehensive performance of the aircraft and improve human factors and comfort;
5. adopt advanced integrated avionics technology to reduce the burden on pilots, improve navigation performance and improve man-machine interface;
6. adopt advanced cabin comprehensive design technology to improve cabin comfort;
7. adopt advanced maintenance theories, technologies and methods to reduce maintenance costs.
We can clearly see that all the technologies adopted are preceded by the word advanced, and the large passenger planes made by China people themselves have extraordinary capabilities!
in terms of design, it is distinctive!
the development goal of p>C919 medium-sized passenger aircraft is to provide safe, comfortable, energy-saving, environmentally friendly and competitive short-range single-aisle commercial transport aircraft for the civil aviation market in 8 to 1 years. In terms of market positioning, we take China as the breakthrough point, and at the same time give consideration to foreign markets, providing multi-grade and multi-range products.
in terms of materials, C919 will use a large number of advanced composite materials and advanced Al-Li alloys, among which the amount of composite materials will reach 2%, and the detailed design inside the aircraft will reduce the weight of the aircraft. In addition, the aircraft will use 2%-3% of the total domestic aluminum alloy and other materials, which shows the improvement of China's industrial capacity. The application of a large number of composite materials makes the cabin sound insulation effect better.
in terms of emission reduction, C919 will be an advanced aircraft with green emission and environmental protection requirements. Reduce carbon emissions.
Comfort is the main goal of the design of the C919 engine room. The seat layout of the engine room will adopt a single channel with three seats on each side, and the middle seat will be spacious, giving people a spacious feeling. The C919 adopts advanced lighting design, which provides people with a larger viewing window and better cabin space. Comfort has been greatly improved.
(the picture is provided by Comac China)
C919 adopts a four-sided windshield. The technology is more advanced, its windshield area is large, and its field of vision is wide. Because there are relatively few openings, it simplifies the fuselage processing industry and reduces the aerodynamic resistance of the aircraft head. The process is difficult, the windshield is relatively large, the manufacturing process is complex and the cost is high.
(Photo courtesy of Comac China)
The p>C919 adopts a hydraulic system with a pressure of 5PSI, which can provide more power. The increase of pressure means that smaller pipes and hydraulic components can be used to transmit power and reduce weight.
each wing of p>C919 is 36 meters long. besides landing gear, it can also store fuel and improve the fuel storage space. The C919 adopts the flight control system of two-sided stick plus stick, which is characterized by four independent main flight control systems with two different configurations. C919 adopts electro-hydraulic action system, which makes it more flexible in power resources, increases redundancy and improves safety performance.
The new technologies adopted by the engine include hollow wide chord swept fan blades, six-stage high-pressure compressor with pressure ratio of 15, double-ring cavity pre-swirl combustor (TAPS), serrated nozzle (reducing noise by 3 dB), high-efficiency and low-cost low-pressure turbine (reducing the number of parts by 35%), low-cost control system and advanced noise suppression technology.
(Image courtesy of Comac China)
(Image courtesy of Comac China)
What's the significance of the appearance of p>C919?
First of all, C919 is a link between the past and the future by learning advanced foreign technologies in a cooperative way and improving the domestic technical level.
Economically, C919 can make China civil aviation no longer rely on the mid-level trunk passenger planes imported from Europe and America, break the monopoly of European and American aviation giants, and save a lot of foreign exchange for the country.
militarily, it is not suitable to be converted into a special plane because of its overweight body and maximum takeoff weight of 2 tons. C919 can completely realize the development mode of one platform, integration of defense and civilian technologies and series, and realize dual-use of military and civilian.
In terms of social benefits, the C919 project can promote the development of upstream and downstream industries, increase a large number of high-income jobs and stimulate local economic development.
In terms of technology, C919 can train China aviation industry in the design and manufacturing of trunk passenger aircraft, train a group of aviation talents, and improve the level of China civil aviation industry.
in terms of international status, C919 is also the result of China's participation in international cooperation in advanced manufacturing industry, and it is also the business card of China's opening.
Today, China has developed rapidly in science and technology, and has become a world leader in some fields. Strengthening comprehensive national strength is our goal, but it is also reflected in the development of science and technology. The appearance of C919 passenger plane not only represents the development and progress in the aviation field, but also represents the enhancement of China's national strength. This gives us more confidence to continue to develop science and technology, and China has entered the ranks of world powers!
Editor: Ji Ali
(Author: Qian Hang, Lv Xuanyi, original works, please indicate that knowledge is power).