With a total pressure ratio of 2.165, the generated lift can take into account both the target lift and the lift required after ground effect!

Chen Nian dropped his pen excitedly. He subconsciously stood up and moved away from the table, and then moved closer in disbelief to observe the hard-won result.

This is the first time.

Through calculation for the first time, a credible result was obtained!

Moreover, according to my own calculations, if tolerances are taken into account, it is relatively safe to set the total pressure ratio of the lift fan to 2.2 to 2.4. This can ensure that even if there are differences in the aerodynamic layout of the J-20B and F-35B, the

Can achieve similar STOVL performance!

Chen Nian dropped his pen excitedly and ran to Yang Wei's office impatiently.

He must share this news immediately, because the significance of this news is too important.

On the other side of the sea, it was already late at night.

Chen Yunyong sat in front of his desk. On the desk was a pile of draft paper spread out that was almost identical to Chen Nian's.

The problem he is trying to solve is the same as Chen Nian's, which is to calculate the appropriate total pressure ratio required for a two-stage counter-rotating lift fan.

This isn't his first attempt.

It should be said that he has been doing this work for five full years.

In the past five years, he tried every means to obtain as many resources as possible within his capabilities. At the same time, he also asked many friends in the same industry for help, but the progress was always slow.

Just as Dick told him at the time, his research was too rudimentary.

But why primary?

In the final analysis, the most critical "1" for startup is still missing.

But recently, he suddenly felt inspired.

Maybe my initial direction was wrong.

In particular, it is difficult to obtain correct results by reasoning from the perspective of pure data.

What is truly effective is physical experiments.

From the perspective of aerodynamic design, it can be deduced how large a fan should be used to meet the requirements of the body layout.

In this way, the data range will be greatly reduced, and the difficulty of calculation will be reduced accordingly.

——

This doesn't seem to be an uncommon idea, and it's not like he hasn't thought of it before.

The key is that he didn't have any information related to the F-35B before, he only had a few words, which was of no use.

But now, after finalizing the time to return to China, special staff passed the information to him, so his research began to advance by leaps and bounds.

It only took him less than two weeks to clarify his calculation ideas.

And today, the first result was calculated!

2.21.

Under this pressure difference ratio, J-20 will achieve perfect adaptation with the STOVL system, and the theoretical problem of the two-stage counter-rotating lift fan will also be completely solved.

Chen Yunyong's face showed an excited look, and he wanted to shout a few times to vent the turbulent emotions in his heart.

But he knew that in his current situation, even celebrating was a luxury.

So, he had to put away all the manuscript papers with trembling hands, fold them into a pile, and then walked towards the bathroom step by step.

Liu Huixia noticed his movements, stepped forward and asked with concern:

"Yun Yong, what's wrong?"

Chen Yunyong lowered his voice and said:

"It's done."

"The fan is ready?"

"That's right!"

He nodded solemnly, with an irrepressible smile on his face.

Liu Huixia's expression also became excited. She held Chen Yunyong's hand tightly and did not say a word for a long time.

The two looked at each other silently. After a long time, Liu Huixia asked:

"Are they going to be burned?"

"Yes, burn it. Everything is already in my mind. We can't leave any clue to those white ghosts."

"Okay, let me help you!"

With that said, Liu Huixia turned around and went to the kitchen to get a lighter. Then she hesitated for a moment and brought the iron pot for cooking into the bathroom.

"Put them inside and burn them one by one to avoid triggering the smoke alarm."

"I know."

Chen Yunyong lit the first page of manuscript paper, and bright yellow flames rose, reflecting the mixed emotions on his face.

"Finally, this matter has finally made some progress."

He said with emotion.

"With this first step, when we go back, no matter how bad the conditions are or how weak the foundation is, we can catch up bit by bit."

"But it just might take a long time."

"Time, Huixia, sometimes I really feel that our time is too limited."

"Ten thousand years is too short, just seize the day."

Hearing his words, Liu Huixia smiled softly.

She threw a piece of manuscript paper into the pot, and then said comfortingly:

"You see, you are still pessimistic at heart."

"In fact, the development of science and technology is leapfrog. Maybe one day, when you don't expect it, the problem will be solved suddenly?"

"Just like when you solve the fan problem, isn't it the same process?"

"No, it's different."

"This problem can be solved only after five years of accumulation. But, how many five years do we have?"

"Your five years, plus someone else's five years, will create different results."

Liu Huixia continued.

"Unless you really don't believe them or that land at all."

"That's not true."

Chen Yunyong shook his head gently, hesitated for a moment, and then said:

"I just regret it. If I hadn't chosen it at that time, maybe everything would have been different."

"it does not matter."

"Every road has different twists and turns - think on the bright side, maybe someone has taken your place in the country?"

Speaking of this, Liu Huixia showed a sly smile on her face.

"Perhaps the results you are making now have actually been made by someone?"

"When the time comes, I really don't know whether you should be happy or disappointed."

Chen Yunyong laughed and replied:

"Of course I'm happy."

"And I'll be happy."

His expression became a little fascinated, the flame in the iron pot was still burning, and the faint green smoke gradually drifted away.

This wisp of smoke penetrated the bathroom window, and with the wind, it floated higher and farther into the sky.

Chen Yunyong watched this scene with some trance.

At this moment, he seemed to be able to see the return path of the wisp of smoke.
Chapter completed!