Chapter 627 The confusing vertical takeoff and landing

Faced with this completely sudden request, Chang Haonan was a little confused at first.

After all, even though he didn't think deeply about Jiang Fuhe's emotions when he first arrived here in the morning, he could still feel them.

Why did it take less than half a day for his attitude to make a 540° turn?

The word you hear doesn't mean "join" but directly invites you to "take over" a project.

And, it’s not just that.

More importantly, I still didn’t expect that there would be such a thing as a vertical take-off and landing engine.

Although at this point in time, the 624 Institute should indeed have obtained some technical data of the R79V300 engine.

But he was very sure that he had never had this kind of project in his previous life.

Even if China's research on vertical take-off and landing aircraft must be said to exist, it is limited to the Warhammer-flavored J-70 vertical take-off and landing model in the 6s.

The idea is extremely wild, which is to hang four lift fans directly outside the J-6.

Even so, it is already the most serious project in this direction.

After all, regardless of the feasibility, at least an idea has been truly formed at the aviation industry level.

And those that follow are basically the works of aviation enthusiasts, and they are countless.

In fact, for China today, the priority of vertical take-off and landing aircraft is definitely not high.

Although due to Chang Haonan's intervention, Huaxia's level in the aviation industry and even the entire manufacturing field is now much higher than in its previous life.

But comprehensive national strength cannot be reversed in a year or two.

Limited resources still have to be focused on key projects.

Vertical takeoff and landing is something that can be done, but it can also be done without.

After all, the combat effectiveness is definitely not as good as that of fixed-wing aircraft with the same technical level, and China does not have the same need as the United States to bully children all over the world.

If it is really implemented, in addition to giving it to the naval aviation force for fun, it will most likely have to be used for export.

But that has to be sold together with a light aircraft carrier or amphibious assault ship.

Arms sales of this level all depend on international influence.

At the moment, China in the late 90s is obviously not up to par.

Therefore, Chang Haonan did not immediately choose to agree or refuse, but asked about the origin of the project itself:

"Mr. Jiang, it's still early for the turbofan 10 to be finalized and put into service. I can't make a decision now as to whether I can participate in a new project..."

"I just... don't know where this vertical take-off and landing engine you are talking about... comes from?"

The conscience of heaven and earth, he really just wanted to satisfy his curiosity by asking this question, and had no other meaning at all.

But something doesn’t sound right to Jiang Fuhe——

After all, the reason why he studied vertical takeoff and landing was because the original thrust-to-weight ratio of 9-level thrusters was occupied by something like the turbofan 10, which is infinitely close to the fourth generation of core machines, so he had no choice but to take a deviant approach.

Now the instigator actually asked this question directly, which has the beauty of an in-person NTR.

Fortunately, Jiang Fuhe was not a really narrow-minded person, and he knew rationally that the other party would most likely not know the twists and turns in the process, so he took a few deep breaths in succession to calm down his emotions that were almost red-hot just now.

But when I think about it carefully, it becomes even more uncomfortable——

Although it is said that his project was killed by Chang Haonan, during the whole process, the latter probably did not realize what happened...

Before others could exert their strength, he had already fallen...

I'm so angry, but there's nothing I can do.

"Mr. Jiang?"

Looking at Jiang Fuhe, who had an increasingly troubled expression on his face, Chang Haonan was a little worried that he might have irritated the other person, so he cautiously gave another tentative shout.

"what?"

"Oh……"

Jiang Fuhe decided to reconcile with himself for the second time.

This kind of thing only happens once and countless times.

So, he tried to maintain as calm a tone as possible:

"Mr. Chang may not know something. Our hospital raised funds by itself a few years ago and purchased some technical data of the R79V300 engine. It was originally intended to be the technical master of the fourth-generation engine."

"But later it was discovered that the performance of the core engine was not enough. Even if our country's production process was not taken into account, the thrust-to-weight ratio was only 8.5-9 when squeezed to the limit, which did not meet the power requirements of the fourth-generation engine."

In fact, of course he knew this story.

Although the R79 engine is already a bit like a fourth-generation engine in terms of core engine level, most of the technology and design ideas are still third-generation, and it is unlikely that it will be able to reach the third and a half generations.

At least the stage pressure ratio of the compressor cannot be compared with today's turbofan 10.

The choice of a radical core aircraft structure is largely just to reduce the weight of the engine to support the vertical take-off and landing function of the Yak 141 aircraft.

Therefore, it is reasonable to squeeze out less than 10 levels of push-to-weight ratio.

Otherwise, the Russians themselves would not have to bother developing the AL41F and AL51F later.

But at this time, you should definitely let the other person continue talking.

Therefore, he deliberately made a puzzled expression, and even adjusted his sitting posture specifically to match his unrealistic acting skills:

"Is there such a thing?"

“是啊，后来就准备在它的设计基础上应用一部分新技术，做个3-8-1-1或者3-7-1-1结构的四代核心机出来。”

When Jiang Fuhe said this, he leaned back in his chair, but did not feel the expected heart palpitations. He was probably relieved:

"As a result, before we officially started taking action here, we were called by Academician Liu to participate in the design review meeting of your Taihang project. We found that this idea had already been preempted, and the degree of completion was very high."

"Although the state's investment in the aviation industry has increased in the past two years, it is obviously impossible to support two similar aviation projects at the same time. But having said that, the technical data of the R79 is self-raised by our institute, so it is impossible to just After much deliberation, the only way out was to let it go back to its old business."

At this moment, Chang Haonan finally knew what was going on with the weird look on the other party's face that started this morning and lasted until just now.

It turned out that without knowing it, I almost killed a project that others had high hopes for——

Although in the original timeline, the project derived from the R79 core machine ended without any problem, at least in Jiang Fuhe's view now, the "culprit" must be Chang Haonan who can't escape.

After a slight pause and adjusting his mentality again, Jiang Fuhe continued:

"We have been studying vertical takeoff and landing for a year now, and other parts are fine. It is just that the thrust between the lift fan and the main fan is not well balanced. We have done several simulation tests with old models of engines. , the thrust fluctuates greatly, and if it were to be installed on an airplane, it would probably overturn midway through takeoff."

"So, when I just heard you say that distributed control gain matrices can be used to improve the accuracy and stability of thrust control, I wondered if this technology could also be used on our models."

"Technically there must be no problem..."

Chang Haonan lowered his head and was about to analyze the pros and cons of this vertical takeoff and landing project, when he suddenly caught a key word from the other party:

"Wait...you just said...lift fan?"

"Yes."

Jiang Fuhe nodded:

"We have also studied the scheme of Yak 141's main engine and lift engine. Although the principle is relatively simple, the lift engine is completely useless in level flight. The dead weight is too large, and more importantly, between different engines, It is too difficult to balance the lift in time.”

"So we were thinking about whether we could use one engine, but output the thrust through two sets of fans. This would at least make the balance a little easier. Of course, the demand for the engine itself would be higher..."

Hearing this, Chang Haonan couldn't help but sigh. China actually has some capable people in the field of aviation development.

You must know that at this time, the JSF project on the other side of the ocean is only a few PPTs. The vertical take-off and landing models of X32 and X35 have not yet been seen, and there are only a few words about the relevant technical solutions.

In other words, Jiang Fu and their ideas are definitely not lagging behind, but they are limited by objective conditions and many of their ideas cannot be used.

In view of this, Chang Haonan swallowed back the polite words of rejection that were already on his lips:

"Vertical take-off and landing engines are indeed a promising technology."

"In this way, after the test of the turbofan 10 comes to an end, I will systematically organize the related technologies of the distributed control gain matrix into materials."

"As for hosting the project..."

Chang Haonan waved his hand:

"After the A and B types of the Turbofan 10 are completed, the next step should be to turn it into a true fourth-generation engine. This process may take several years."

"For me personally, firstly, I probably can't spare the time and energy to participate in two projects that are far apart, and secondly... it's not easy to take away the beauty of others. This engine is a self-funded project of your institute, even if When I become a full-time officer in the future, you should be the main arresting unit."

"However, if Mr. Jiang needs it, we can communicate at any time. We are all colleagues."

Chang Haonan's response can be said to be quite appropriate.

It even made Jiang Fuhe feel a little embarrassed because of his thoughts during the previous half day.

"Then, thank you in advance for Mr. Chang's support..."

While talking, the two shook hands again.

Only this time, Jiang Fuhe finally showed a sincere smile.