After all, the TNB-19B has a captain of 42.3 meters, a wingspan of 38.4 meters, a maximum take-off weight of 68.7 tons, and a maximum range of 5,620 kilometers.

It was originally planned to be equipped with a WD-66 large bypass ratio turbofan engine with the same 2.5-generation 17 MW core engine as the WD-62MVP high-power turbofan engine.

The overall structure is inherited from the WD-60 large bypass turbofan engine before the Ascendas series, but it has applied more mature design and technology. The basic technical indicators are roughly the same as the CFM-56 large bypass turbofan engine sold by General Motors in the United States. the same.

Two WD-66 turbofan engines with large bypass ratio are enough to send TNB-19B aircraft with a maximum take-off weight of less than 70 tons into the blue sky and soar freely.

This is indeed the case. After all, the maximum thrust of the WD-66 large bypass ratio turbofan engine has reached 10.8 tons, which is almost equivalent to the latest improved model of the CFM-56 large bypass ratio turbofan engine.

Even the Airbus A320 and Boeing 737 with a take-off weight of more than 80 tons can be given extremely excellent power performance by the CFM-56 turbofan engine with a large bypass ratio, and the WD-66 turbofan engine with a large bypass ratio can also give TNB— The same advantages of the 19B aircraft.

However, to date, TNB-19B aircraft does not use a powertrain that can be solved by only two WD-66 turbofan engines with a large bypass ratio. Instead, it uses four WD-56ML models with a thrust of only 6.5 tons. Turbofan engine.

This is not because China takes off pretentiously and does not use good ones, but because civil aviation engines have extremely high requirements for safety and stability.

Whether it is the previous Ascendas Group or the current China Ascendas, although it can create a turbofan engine with the same thrust as the CFM-56 large bypass ratio turbofan engine, it can be due to the material, design and system integration aspects. Lack, China Ascendas has so far been unable to make its large bypass more stable than the turbofan engine as CFM-56.

After all, for China’s take-off, the development of a large-thrust civil aviation large bypass fan is also the first time. After walking it again, it is considered to be a formal entry, and then it is slowly polished with specific models such as WD-60 and upgraded WD-66.

After all, it takes a few decades for people to fly Airbus A320 and Boeing 737 with two CFM-56s. If you want to compete with other aviation giants in the future, you can’t let your own aircraft hang two Taiwan pulls. The crotch WD-66 runs around, right?

So starting from WD-60, Ascendas Group began to conduct tests with the most stringent standards. The cumulative experiment was 100,000 hours, and tens of thousands of modifications were made before and after, so that the later modified models even WD-60 This mother almost didn't know each other.

This had to be renamed altogether, and only then has today's WD-66.

However, the name has been changed, and the test standards have been increased. At the same time, with the establishment of China’s take-off, more resources are in hand. The tests that could not be done before are not difficult at this time, so the various requirements are almost the same. Turning and adding up, almost to the point of completely changing ~~~ state.

Take the extreme failure of the engine catching fire and exploding.

China's Ascendas requirement for WD-66 is that any point outside the core aircraft explodes and catches fire, and the engine can continue to operate safely under the action of the core aircraft until the aircraft landed safely.

For this indicator, China's Ascendas Aviation Development Department has repeatedly tested and revised countless times for several years, and this is a glimpse of the eyebrows.

Because of this, it will take at least three years for the WD-66 to mature.

At that time, Ascendas Group urgently needed a large-scale platform for testing avionics. Civil aircrafts in Europe and the United States will be available at that time. The problem is that the navy’s anti-submarine equipment, the air force’s electronic warfare equipment, the integrated avionics system of the next-generation fighter aircraft, and the early warning aircraft Radar, these military-related things, European and American aviation giants are expressly prohibited from applying to their civil aviation passenger aircraft platforms.

There are not so many similar models in Russia. The problem is that the Russian products are too rough, and the safety and stability are not domestic. It is really a little frustrating to use.

As a result, the Ascendas Group at that time simply set up a new stove and did it on its own.

After all, at that time Ascendas Group was developing an enhanced version of the full-size design of the TRJ-700 regional airliner based on the TRJ-500. Ascendas Group took the full-size design of the TRJ-700 regional airliner as the blueprint, and the width of the cabin was inconvenient, which further elongated the aircraft. Body and wingspan.

At the same time, move the engine tail pod under the wing.

However, the elongated fuselage and wingspan have caused the total structure of the aircraft to increase linearly. The thrust of the WD-56ML turbofan engine originally used on the TRJ-700 regional airliner is obviously not enough, and the WD-66 at that time was not as mature as the current one. do?

Lin Guanghua, who was in charge of this project at the time, borrowed from Lao Maozi's approach. He didn't have enough thrust to make up the engine, so he added two more to become a four-engine engine. Doesn't the thrust go up?

Although simple and rude, it is very effective.

As for the cost of fuel consumption and maintenance of the four engines, there are some shortcomings that are not worth the loss. Whether it is the Ascendas Group at the time or the current China Ascendas, I really don’t care. After all, the TNB-19B is just a test and verification machine, except for the stability that cannot be bypassed. In addition to performance and safety, the most important thing is that the cost of each modification of the TNB-19B is not low. In the toss of various internal equipment disassembly, assembly and disassembly, it is really nothing to maintain two more engines.

However, although the four WD-56ML turbofan engines can support the TNB-19B, the thrust of the WD-56ML turbofan engine is too small after all. In addition, the 42-meter-long fuselage of the TNB-19B aircraft still uses it. The 3.5-meter-wide diameter of the TRJ-700 regional airliner results in a particularly slender fuselage, which sets off the already small WD-56ML turbofan engine even more slender.

So many people in the aviation industry will ridicule when seeing TNB-19B: "This won't be driven by 5 APUs (auxiliary power units), right?"

Of course, compared to five APUs, TNB-19B aircraft are more often called sausages.

The fuselage is really slender and slender, and it really looks like a sausage.

But whether it is the ridicule of the 5 APUs; or the joke of the sausage, when there is no good plane in the country to go to the Balkans to pick up the Chinese.

This atypical aircraft with emergency nature is the most suitable model~lightnovelpub.net~ because the TNB-19B aircraft is basically an extended version of a civil aircraft, with a lot of TRJ applied on it— The technology of the 700 regional airliner can even be used to a certain extent in the fuselage parts of the two models.

In addition, the more important thing is the voyage. Although 5,620 kilometers cannot fly directly from the eastern part of the country to the Balkans, it is more than enough to start from the Krai.

Even if it is not possible to fly to Belgrade via Turkey for various reasons, need to go around the Black Sea jurisdiction of Russia, and enter Belgrade via Romania, which spares a big circle, the TNB-19B aircraft can still overcome it easily.

Based on these rigid indicators, after reviewing the report submitted by Zhuang Jianye, the superiors immediately agreed to this request, began to make emergency modifications to the TNB-19B aircraft, and then flew to Belgrade.

As for the effect...

The leader of the foreign affairs department who just landed put it in place in one sentence: "At that time, we saw that we were made in our own country. Those countries outside the region that wanted to see the excitement were all green!"

txt download address:

phone-reading: