Chapter 632 The upper replacement of AL31F

Compared with 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.

This lasted until the next morning.

So much so that most of the operators changed shifts.

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

Fortunately, he has acquired the ability to "store" sleep time since his rebirth.

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

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

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.

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.

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 really powerless to do.

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

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.

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.

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

As for the noise…

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

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

"report!"

"Afterburning experiment data has been collected!"

As he spoke, his body even swayed a little——

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

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

Now if you stand up suddenly, you will inevitably have the problem of insufficient blood supply and black eyes.

"That's it. Prepare to end the experiment and summarize and output the data."

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

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."

The other party opened his mouth, probably wanting to refuse as his first reaction.

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

"Yes!"

"The results are out?"

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

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——

When the test commander shouted the report just now, 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 was also mixed with 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 was from Institute 624, and he had just had a good night's sleep to recharge his batteries, so he was indeed much faster at operating 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 directly clicked on the content.

They had all seen the thrust part just now.

Although there were some fluctuations in the value as the afterburner was used for a long time, it was still around 14150KgF overall and did not change much.

As for fuel consumption...

After 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 afterburner experiments, it can even reach 0.182kg/(N·h).

In comparison, this indicator of the AL31F is 0.198, while the F110, which has a low-speed performance orientation, is already close to 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.

This made Jiang Fu and Zhicu Yahuazi next to them——

Do you hear that this is human speech?

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

Are you complaining that the advantage is not enough?

However, Jiang Fuhe had already achieved complete and complete self-reconciliation by now, so after complaining a few words in his heart, 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 Pretty much, you can’t perform to your level, so it’s normal that the advantage isn’t as big as when you push in the middle.”

Of course, Chang Haonan also knows that given the current level of processing and manufacturing in China, the reason why the turbofan 10 can achieve its current level is due to excellent design to a certain extent.

As for this, according to Haiyide, Factory 410 can only produce two units per month.

The debts owed by late-industrial countries in the past are not so easy to be completely repaid even if they are left unchecked.

He has definitely exceeded his mission.

Of course, if you 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:

"When making 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 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..."

Although this matter had been confirmed with Chang Haonan a long time ago, the latter's words were still not as shocking as 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 about 1280mm in diameter..."

"So, the turbofan 10 should be able to directly replace the AL31F in situ?"

"This depends on the specific circumstances."

After he relaxed, Chang Haonan also felt a sense of sleepiness 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..."

Unlike the previous 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 ridiculously high faults and can fully support the reliability required for a single-engine model.

Moreover, it was Chang Haonan who made the decision and asked the 611 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.

If we can no longer guarantee the supply of domestically produced power and cause problems with aircraft delivery, it would be too personal...