The Military-industrial Scientific Research System of the Academic Master Chapter 632

Chapter 632: AL31F's superior replacement

Compared to the intermediate thrust state, the afterburner cannot be opened for a long time, otherwise it will have a negative impact on the life and stability of the engine.

Therefore, in order to collect the minimum duration data required for a single round of experiments, afterburning experiments can only be conducted in an intermittent manner.

In the end, it was just as Chang Haonan estimated at the beginning.

lasted until the next morning.

So much so that most operators changed shifts in between.

Of course, as the project leader, Chang Haonan must keep an eye on it.

Fortunately, he has gained the ability to "save" sleep time since his rebirth.

Some time ago, when the work pressure in Rongfei was not too high, I slept a lot, so I was able to hold on.

Jiang Fuhe, on the other hand, is basically just soy sauce.

Having said that, he is already old after all, and he is not as strong as a young man like Chang Haonan. There are some things that he is indeed powerless to do.

So, he has been sitting at his workstation for seven or eight hours.

If you stand up suddenly now, it is inevitable that the eyes will become dark due to insufficient blood supply.

“The afterburning experiment data has been collected!”

Chang Haonan meant to let the sixty-year-old comrade go back to rest and send him a copy as soon as the results came out.

The test commander also belongs to the leadership position here, so he cannot change shifts like ordinary operators.

"yes!"

But the bloodshot eyes in his eyes even made his vision slightly red, so after thinking about it for a moment, he nodded:

As for the noise…

The reason why I also stayed here to hold on was because I wanted to see the results of the sea level afterburner test as soon as possible.

“That's it, we're ready to end the experiment and summarize and output the data.”

When he spoke, his body even swayed a little -

By the second half of the night, I was almost too sleepy to hold on.

For a person who has been working in aviation for most of his life, without the roar of turbines in his ears, he may not be able to sleep well...

But Jiang Fuhe's mentality at this time is a bit similar to that of a fan who stays up late to watch football and buys the result. How could he possibly agree to such a thing.

After a slight pause, he said in a less formal tone:

“After the engine is shut down and cooled down, you can go back and rest first. Other comrades can take care of the rest of the data.”

Even though it is clear that the performance of this engine should be quite amazing, there is always a sense of excitement about winning a lottery ticket.

The other party opened his mouth, probably because his first reaction was to refuse.

So he slept directly on a bench in the control room.

Although he was confident in the engine test results, Chang Haonan still breathed a sigh of relief when he gave this order.

By the time Chang Haonan could no longer tell whether the roar of the engine or his own tinnitus was what was ringing in his ears, the test commander finally stood up:

"Report!"

“The result is out?”

At this time, Jiang Fuhe, who seemed to be sleeping deeply just now, had put on his coat and came back behind Chang Haonan.

It can only be said that the sword is indeed immortal. Although the ability to stay up late is not comparable to that of young people, even if you fall asleep, you can still capture the key words -

Just when the test commander shouted the report, he was actually awake.

“The test is over, but the results still need to be processed before they can be output.”

Chang Haonan did not look back, but went straight to the computer that recorded the data.

Previously, the intermediate thrust data was measured continuously, so the results could be output immediately after the experiment. However, the afterburner test also included a lot of idle conditions for cooling the engine, so these parts had to be eliminated.

“Let me do it, I'm familiar with this.”

After all, Jiang Fuhe is from Institute 624, and he has just had a good night's sleep to recharge his batteries, so he can indeed operate much faster than Chang Haonan.

In about ten minutes, the compiled report was generated on the desktop.

Jiang Fuhe couldn't even wait to print it out and clicked on the content directly.

The thrust part, they have all seen it just now. Although the value fluctuated somewhat with the long-term use of the afterburner, it is still generally around 14150KgF and has not changed much.

As for fuel consumption…

Performing a total of 1.5 hours of afterburner testing, the average result was 0.189kg/(N·h).

In the first 15 minutes, which is the first round of afterburning experiments, it can even reach 0.182kg/(N·h).

By comparison, this indicator of AL31F is 0.198, while the performance-oriented low-speed F110 is already around 0.210.

“Compared to the middle thrust, the performance advantage compared to the AL31F is still a little smaller...”

Chang Haonan looked at the data on the screen and said with a somewhat pityful tone.

It made Jiang Fu and Zhicui Yahuazi next to them—

Do you think this is human language?

Others are worried about not being able to catch up with similar foreign products in terms of performance.

Are you complaining that the advantages are not big enough?

However, Jiang Fuhe had already achieved complete and complete self-reconciliation by this time, so after complaining a few words in his mind, the main thing he thought about was how to hold this thigh tighter...

At the same time, he didn't forget to pick up Chang Haonan's words:

"I looked at the design information before. After all, the total pressure ratio of the turbofan 10 is still slightly higher than that of the AL31F, and there is not much correlation between the working status of the afterburner and the compressor. A fuel injection ignition device, everyone designs It's almost like you can't perform to your level, so it's normal that you won't have as big an advantage as you did during the middle push.”

Of course, Chang Haonan also knows that with the current processing and manufacturing level in China, the reason why the turbofan 10 can achieve its current level has been compensated to a certain extent by excellent design.

At this point, according to Haiyide, Factory 410 can only produce two units per month.

The debts owed by late-industrial countries in the past, even if they are open and closed, will not be easily repaid.

He has definitely overfulfilled his task.

Of course, if you want to think about it, you definitely can't say it directly when expressing your stance:

“Not quite.”

Chang Haonan leaned his upper body on the chair and rubbed his cochlea with his hands.

At this time, the engine speed has been reduced to the idle state again, and the high-frequency noise has also weakened by several orders of magnitude, but the tinnitus will still bother him for a while:

“In subsequent improvements, we still need to focus on the afterburner, as there are shortcomings…”

This time Jiang Fuhe was used to it, or was numb. He didn't even look back and continued to focus on the other parameters below.

“The national military standard weight written in the technical manual of this engine is 1560kg. After it was put on the bench, the actual measurement was 1575kg. If you calculate it like this..."

He raised his head and did a little mental calculation:

“The thrust-to-weight ratio at sea level is indeed 9…”

Even though this matter has been confirmed with Chang Haonan a long time ago, the shock level of the latter's words is still different from the actual calculation of a 9.0 result.

“Of course, when it comes to restoring the design parameters on paper, I am still a little confident. Whatever is said is what it is, and the error is basically around 5%.”

Chang Haonan was not overly modest this time.

“The total length of the engine is 4805mm, the maximum diameter is 1250mm, and the air inlet diameter is 915mm…”

Jiang Fuhe took another look at the physical parameters of the Turbofan 10 at the bottom of the report, which had nothing to do with this test but were given as a technical background:

“I remember that AL31F is 5 meters long and has a diameter of about 1280mm…”

“So, the turbofan 10 can directly replace the AL31F in situ?”

“This depends on the specific circumstances.”

After the whole person relaxed, Chang Haonan also felt a sense of drowsiness coming over him, but he still managed to answer Jiang Fuhe's question:

"For the J-11, the internal space of the fuselage is large enough. It is not a problem for the air inlet diameter to be 10mm larger. There is also enough redundancy to lay out the communication cables required for full digital control. Therefore, as long as the flight control allows access, both engines can Even if they can be replaced on the same plane, there won't be any big problem.”

“If it is a medium-sized aircraft like the J-10, corresponding space needs to be left during manufacturing. Although the changes will not be major, once the aircraft comes off the production line, it will not be compatible with another engine model.”

“So if the 410 factory has insufficient production capacity, it can only give priority to ensuring the supply of J-10 and let the J-11 side wait a little longer..."

Unlike the previous generation J-10 which used AL31FN for a long time, the J-11B was replaced with the turbofan 10 in the second batch.

The turbofan 10 on this timeline does not have an absurdly high number of failures and can fully support the reliability required for single-engine models.

Furthermore, it was Chang Haonan who took the initiative and asked the 611 Research Institute to change the J-10 into a larger and heavier Category II design, so that the originally planned AL31FN could not meet the requirements.

It would be too personal if the supply of domestically produced power could no longer be guaranteed and problems would arise in the delivery of aircraft...

(End of this chapter)

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