Technological power starts with upgrading lenses

Kangchi received a very positive answer. Except for the research and development team involved in the turbofan 30, everyone at the scene froze in place...

This made Yan Hui and others feel a little secretly happy. After all, this engine was also their hard work during this period. Seeing that he surprised so many leaders like this, how could their sense of pride and superiority not be overwhelming.

I finally understand why Kang Chi always likes to show off mysteries, or to titillate people...

This feeling is really addictive!

However, even though Yan Hui and others participated in the manufacturing, they were not absolutely sure about the performance of this engine, so they were still a little nervous at this time, for fear that the test results would disappoint everyone.

After briefly feeling refreshed, Yan Hui quickly adjusted his state and no longer paid attention to the emotions of the leaders visiting the test. After looking at the data on the screen, he said in a deep voice: "Prepare for the variable duct cruise test." , engine ignition!"

"Engine fire!"

"Turn off the variable cycle afterburner function and increase power in a 6 bypass ratio state."

"Received, the 5-second slow rise of the 6-bypass specific power begins!"

As the tester pushed the pull rod again, the test bench tension curve on the screen suddenly began to rise sharply.

"150KN, 200KN, 250KN...312.6KN! 6 bypass ratio turns off the afterburning function, the maximum thrust is 312.6KN, and the fuel consumption rate is 0.765Kg/KN·h!"

"6 bypass ratio throttle 60% cruise test."

"Adjust the throttle to 60%...the thrust is 219.6KN, and the fuel consumption rate is 0.564Kg/KN·h."

After hearing this result, Chief Shen's hands immediately tightened subconsciously.

Without turning on the afterburner, the maximum thrust can reach 312.6KN, and the cruise thrust is 312.6KN. This achievement is indeed worth two for four.

Moreover, the fuel consumption of 0.564Kg/KN·h is only 0.157Kg/KN·h higher than the turbofan 20 with a fuel consumption of 0.407Kg/KN·h.

But the thrust it provides is almost equivalent to two turbofans 20!

In this case, even without variable duct technology, the overall fuel consumption of the Yun-20 can be reduced from 1.628 to 1.128 by replacing four engines with two, and the theoretical battery life can be increased by at least 44%.

And this is a simple conclusion drawn by calculating engine fuel consumption,

According to the information just given by Kangchi, this engine uses a large number of low-density and high-strength structural ceramic materials such as PG01, and the overall weight is only 59% of the Turbofan 20.

In addition, four engines are replaced by two...

The thrust-to-weight ratio of the aircraft will be greatly improved.

Therefore, the range improvement can definitely exceed 50%!

This means that the maximum range and fully loaded range of the future Y-20S are expected to exceed 12,000 kilometers and 6,000 kilometers!

Thinking of this, Chief Shen became a little uneasy again.

"It's really a terrible future life..."

"What's this?" Chief Lu raised his eyebrows slightly proudly: "I'm almost used to being afraid..."

"And it's not enough if you don't get used to it, otherwise you will get heart disease sooner or later."

"..."

"Push the throttle to the maximum and adjust the bypass ratio to 10!"

After a short test in which the 6-duct system was unable to turn on the afterburner, it was finally time to change the duct.

Everyone's eyes widened immediately, staring closely at the real-time picture of the engine, wanting to see how this thing became ducted.

However, after Kang Chi just revealed that this engine can change ducting, Dong Jun and the others actually roughly guessed the principle of ducting through the design of this engine.

At the same time, this also explains why its engine air inlet and blades are half-folded like an umbrella, and why the outer shell looks like strips of material welded together...

These designs are all prepared for duct change!

But the question is, can such a complex structure really be realized?

"Throttle 100%, start changing bypass... 7 bypass ratio, 8 bypass ratio... 10 bypass ratio!"

Through the real-time picture of the engine, everyone witnessed the entire process of the engine slowly deforming under the operation of the test engineer.

The whole process looks very simple. It feels like the front half of the engine is undergoing a stretching and expansion action, and then the leaf umbrella at the front end is fully opened as the engine becomes larger. Finally, the engine becomes a horizontal circular platform.

The so-called truncated cone is the section of the cone with the tip cut off, and the cross section is the jet nozzle of the engine. During the process of changing the duct, the size of the jet nozzle remains unchanged.

Although it sounds very simple, everyone on site knows that this requires strict technology and process, because the engine is running at high power at this time, and any imbalance may cause severe surge. In severe cases, The entire engine may even be scrapped directly.

However, it seems that the operation of the engine is still very stable, and there is nothing that everyone is worried about.

The diameter of the air inlet at this time was at least seven meters, which looked very huge. Just listening to the roaring sound gave people a feeling of infinite power.

Just when everyone was about to turn their attention and look at the thrust data, the test engineer took the lead and said: "The variable duct test is completed. The engine ran stably during the entire process. No special surge was found. The current thrust of the engine is 426.9KN!"

Wow——

After hearing this data, the scene immediately became excited!

"Damn it, isn't this too perverted?"

"Is the performance improvement of the variable duct so great?"

"And the fuel consumption is still 0.765Kg/KN·h..."

"This technology is too scary!"

"..."

Although more than 80% of the thrust of a turbofan engine is provided by the external bypass, and now that the bypass ratio has improved so much, the increase in thrust is certain, but when the results came out, everyone was really shocked.

"Throttle down to 40%!"

Because the test time was limited, Yan Hui completely ignored the reaction from the outside world and quickly issued the next instruction. The scene suddenly became quiet again, trying not to disturb the test by making any noise.

"The throttle is reduced to 40%, the current thrust of the engine is 256.5KN, and the fuel consumption rate is 0.364Kg/KN·h!"

"Reducing the throttle to the minimum and preparing for the end of the test."

"Received, entering the final stage of the test..."

As the test came to an end in an orderly manner, thunderous applause and cheers finally erupted from the venue.

"Okay, great! Congratulations to Dr. Kang!"

At this moment, Chief Shen no longer cared about his calm demeanor. While applauding along with everyone, a smile appeared on his face.

Then Kang Chi finally knew why he never showed his teeth and smiled.

Because his front teeth are empty...

No, wouldn’t it be better to have a missing front tooth with a crown? Is there any hidden secret or story behind it?

Although Kang Chi was a little curious in his heart, he did not show any doubts on his face. He just smiled and said, "Thank you, leader. We are all happy today."

"Well, we are all happy! China is really lucky to have a talent like Dr. Kang!"

"Chief Shen, thank you very much."

"Hey, that's not bad at all!" Chief Shen gently pulled Kang Chi with his already wrinkled hands, "You must be hungry after testing for so long. Let's go have a meal together first. Dr. Kang must give us something at noon today. Add chicken legs!”

"Yes, you have to add chicken drumsticks to Mr. Kang!"

"Add 99 chicken drumsticks!"

Seeing everyone keep making noises, Kang Chi suddenly felt dumbfounded.

Just when everyone was immersed in joy, Dong Jun and Chi Jinliang also squeezed over, looked at Kang Chi a little coquettishly, and after holding it for a while, they whispered: "Mr. Kang is awesome... …”

After everyone heard this, they burst into laughter.

"Is Mr. Dong hungry? Mr. Kang didn't even hear his voice so quietly."

"I heard that your bet was based on shouting three sentences?"

"..."

Hearing everyone's cheers, Dong Jun was so embarrassed that he could dig out three rooms and two living rooms with his toes...

But I'm willing to admit defeat, not to mention in front of so many leaders, I can't cheat, right?

The two simply gave up and shouted with all their strength:

"Mr. Kang is awesome!"

“Mr. Kang is awesome!!”

Then there was a burst of warm laughter and applause once again.

Kang Chi also patted the two of them on the shoulders, smiled at them and said, "Actually, I just wanted you to help me get lucky 20S quickly. I hope you don't take it too seriously."

"Well, we actually figured this out just now, so these few words are actually from the heart. Mr. Kang... is really awesome."

"Well, actually you guys are pretty awesome. If it weren't for your drawings, I wouldn't have been able to build the engine so quickly, so I'm standing on the shoulders of giants... and I heard that you can build it in a month at most. The Y-20S fuselage has been built, and the speed is actually very fast."

"It won't take more than a month. We will speed up the progress when we go back and try to help you build the fuselage by mid-April."

"Okay, I'll trouble you." Kang Chi looked at Dong Jun with an expectant expression, "I believe everyone wants to see it take off with the turbofan 30 installed."

"Hmm... By the way, actually I still have a doubt. Just now, in the case of 10 bypass ratio, the thrust was 426.9KN without the afterburner. So if the afterburner is enabled, wouldn't the thrust be able to reach far Far more than the 495.2KN when the bypass ratio was 6?”

"Theoretically, this is true." Kang Chi nodded.

"In the highest power test just conducted at a bypass ratio of 6, the efficiency of the afterburner was indeed not turned on to the maximum, so theoretically its ultimate thrust at a bypass ratio of 10 will indeed far exceed 495.2KN."

"The problem is that at a bypass ratio of 10, although the air intake volume has increased, the afterburner is still the same combustion chamber, and its performance has not changed, so the ultimate power is still limited by the highest energy efficiency of the two combustion chambers."

"At the same time, although the performance of PG01 is strong, it also has a limit. When the afterburner operates at its limit, the service life of the engine will also be reduced."

"So under normal circumstances, the thrust of the engine will be limited to about 500KN. Unless there is an emergency, I do not recommend lifting this limit...We will also conduct a limit test in this area in the afternoon."

Dong Jun nodded and found that his thoughts were a bit too idealistic.

Even a little too greedy.

When the bypass ratio is high, it means that the aircraft has entered the cruising state. At this time, the pursuit is fuel economy rather than performance.

You can’t have both performance and fuel economy...

After everyone went to the cafeteria for lunch, they quickly returned to the test room. The highlight of the afternoon test was the ultimate thrust of this engine. After completing this test, the performance parameters of this engine were basically completed.

"6 bypass ratio, turn on the adaptive variable cycle afterburner, lift the maximum throttle limit, and the engine is ready to ignite..."

The first round of testing still had the ultimate thrust of 6 bypass ratio.

After the throttle limit is released, the fuel injector will inject fuel at the maximum speed. If the combustion limit is exceeded, the fuel may not even be burned and will be directly sprayed out. At this time, the thrust is likely to decrease.

Soon the curve data of the ultimate thrust came out.

"The ultimate thrust is 589.7KN!"

After hearing this data, everyone's brows couldn't help but jump.

Currently, the engine with the highest thrust in the world is Boeing's GE9X. Its normal maximum thrust is 470KN and its ultimate thrust is 598.2KN (61 tons).

Although the limit data of the Turbofan 30 just now is a little less than that of the GE9X,

But this is under the condition of 6 bypass ratio!

Everyone began to have a vague premonition...

today,

I'm afraid I can witness with my own eyes that a world record has been broken!

This world record is not a weird record for children to play house with.

Aviation engines are definitely one of the most valuable pearls in the industrial crown.

Moreover, more than 80% of the core technologies and components of aero engines and gas turbines are common. Therefore, the fields and significance it involves are far more than just an aerospace engine. It has implications for ships, warships, power generation and other fields. Very broad application space.

"The 12th item of the first round of testing, extreme thrust test, 10 bypass ratio, turning on the adaptive variable cycle afterburner, lifting the maximum throttle limit, and the engine is ready to ignite..."

As Kang Chi read out this test project, everyone suddenly became nervous again, began to hold their breath, and looked closely at the data on the big screen.

Soon the scream of the engine came from next door, and it became louder and louder, and at the same time, the flames ejected from the rear of the engine became longer and longer...

400KN, 500KN, 600KN…

664.5KN (67.7 tons)! !

When they saw the peak of the thrust curve, almost everyone's eyes showed a different look.

It’s the same as everyone’s premonition.

At this moment, this engine, which is full of black technology, really broke the world's maximum thrust record for aerospace engines!

Moreover, it is a full 6.76 tons higher!

After three seconds, the engine slowly begins to reduce power, then stops and enters the cooling stage.

Before the test engineer could report the specific data, the entire laboratory suddenly boiled.

"Damn, that's awesome!"

"As soon as Mr. Kang takes action, the world record will have to be replaced by the name of our country, China!"

"Mr. Kang is mighty!"

"Overtaking in a straight line, far ahead!"

"Today there is another bright pearl in the industrial crown of China!"

"..."

Everyone clapped their hands wildly, even though their palms were almost red and aching slightly before, but at this moment, everyone still couldn't help but use their greatest strength and give the loudest applause.

In the spacious control room, boiling cheers and thunderous applause resounded instantly and lasted for a long time...