The Military-industrial Scientific Research System of the Academic Master Chapter 631

 Chapter 631 Afterburning!

 Jiang Fuhe's guess is naturally correct.

Chang Haonan and him looked at each other in confusion for a while, then nodded:

“Although from a strict engineering perspective, I can't guarantee what the situation will be like until the afterburner is actually turned on and the data is measured.”

“But... at least as far as my goal is concerned, it is indeed to achieve a selevel afterburner thrust-to-weight ratio of turbofan 10 of 9.”

 At this point, perhaps I felt that what Jiang Fuhe just said might cause ambiguity, so I added another sentence:

  “I mean, the real 9, not the rounded one.”

 In fact, the reason why the two people have different understandings of this matter is mainly because of the different backgrounds of the times.

In the 1990s, everyone's main equipment was actually products developed in the 1970s and 1980s.

 (Of course, most of China's main equipment is still from the 1950s and 1960s...)

During the Cold War, both sides of the Iron Curtain tended to report the performance of their own equipment as high as possible, whether it was purely for reasons of face or practical considerations of exerting military and psychological pressure on the other side.

 A typical example is that both the United States and the Soviet Union have long been obsessed with using specially modified aircraft to set records.

 More importantly, China has gradually begun to establish its own industrial discourse system and no longer completely follows foreign countries.

 At that stage, countries' publicity about equipment performance gradually turned pragmatic, and many opportunistic habits in the past were gradually corrected.

 But now that we are doing this...

At that time, if we think about it a little bit in publicity, we can directly say that my country's aerospace engines will directly jump from the second generation to the fourth generation level.

"Um…"

 Jiang Fuhe sighed.

Thinking of this, Jiang Fuhe's train of thought stopped.

"Um?"

It seems that even now, as long as the other party can complete the turbofan 10 project, they can just sit back and wait for the evaluation of academicians...

Although after 2010, with the gradual rise of Internet thinking, the habit of drawing pie on PPT reappeared both at home and abroad, and it was even crazier than during the Cold War, but at that time Chang Haonan's academic habits had been basically finalized. The impact was relatively minor.

If we follow past international practices, there would be no problem if the turbofan 10 in front of us is simply called a "thrust-weight ratio 10-level aeroengine."

 This is when some ideas that are “incompatible” with this era appeared.

"well…"

However, although Chang Haonan has been reborn for almost two and a half years, the time when he really received education and learned to do projects was at the beginning of the 21st century in his previous life.

  It's all about making things difficult for yourself.

 In his opinion, Chang Haonan is no longer just down-to-earth.

 And Chang Haonan himself can basically just wait to be evaluated as an academician.

Therefore, for Jiang Fuhe, who has been working since the 1960s and has almost completely experienced this stage, the concept in his mind is naturally the same.

 It has almost no real meaning, but both sides enjoy it.

 Because he suddenly realized...

 On the other side, Jiang Fuhe immediately stood in awe after hearing Chang Haonan's explanation.

 It is narrow-minded after all.

 Others are in their twenties and have basically reached the upper limit of the existing system, so naturally they no longer care about this.

Thinking about it this way, it even made him feel a little inferior.

“Mr. Chang, the intermediate thrust data has basically stabilized. Do you think we should start turning on the afterburner directly?”

While Jiang Fu and emo were talking, the test commander next to him asked Chang Haonan, and at the same time handed a temporary performance report to the latter's hand.

 The thrust curve just now has been extremely smooth, so there is nothing interesting to see.

And more complex data cannot be presented on a piece of paper in real time.

 So Chang Haonan focused on the fuel consumption of the intermediate thrust.

 For military models, economical efficiency and environmental protection level are less important to consider. Fuel consumption more importantly affects the aircraft's range.

 Especially, the thrust of turbofan 10 has increased by about 10% compared to AL31F.

 While greater thrust brings performance improvements, it also means more fuel is consumed during the same working time.

 He turned the report to the other side and quickly found the numbers he was interested in.

 0.0745kg/(N·h)…

At this time, Jiang Fuhe, who had adjusted his mentality, also came over:

“This...the fuel consumption is almost 6% lower than the AL31F. Considering the total pressure ratio of this engine of 25, it is already quite amazing.”

Chang Haonan's slightly tired face finally had a slightly satisfied expression and nodded:

“Well, it can basically offset the increase in fuel consumption caused by the increase in thrust, which ensures that the range of the third-generation aircraft after the engine replacement is basically the same as before.”

Although this number is slightly higher than the F110's around 0.07, the latter is specially optimized for subsonic performance after all, and it will definitely take advantage of the fuel consumption of intermediate thrust. Considering that the fuel consumption of the AL31F basic model, which is also in the afterburning state, is as high as 0.0795, the fuel economy of the turbofan 10 should be considered quite good.

 After all, before the engine enters the variable cycle era, whether it is the third generation or the fourth generation, it cannot escape the limitations of the laws of physics.

Thinking of this, Chang Haonan took a deep breath and put a piece of paper in his hand on the table next to him:

 “Get ready to use afterburner.”

If it is an aircraft engine that did not have full authority electronic control before, then all items must be determined before the start of each test, and it is difficult to add them midway.

 But for the turbofan 10, as long as there is no problem with the engine, just issue an additional command on the console.

"yes!"

 The test commander returned to his station, pointed into the microphone and ordered in a deep voice:

“Attention everyone, activate the afterburners!”

 The operator at the other end of the control room then pushed the simulated throttle valve to the extreme "afterburner" position in the control computer.

Almost at the same time he made the operation, the roar of the engine that had already made everyone numb became increasingly sharp.

 The images of several cameras also appeared dazzling white due to overexposure in an instant.

 The next few seconds felt like centuries.

With the lens aperture automatically adjusted to a more suitable size, everyone was finally able to see clearly what was going on inside the testing workshop.

From almost all angles of the camera, one can clearly see the translucent bright purple tail flame with the Mach ring behind the engine tail nozzle.

On the working condition display next to it, the cooling power of the water-cooling device in the exhaust section of the high-altitude platform was also fully charged in an instant.

"I go…"

When Jiang Fuhe saw this scene, his whole body trembled:

"If the temperature of your tail flame is 50℃ higher, I guess I will have to stop the test..."

 “Is that so?”

 Because the afterburning conditions have not stabilized yet, Chang Haonan's attention was not on the parameters just now.

Now when I heard what the other party said, I realized that I had basically reached the upper limit of this platform...

Jiang Fuhe nodded dumbfounded:

“When this platform was put into use two years ago, Academician Liu and I expected that it could support high-altitude simulation verification of aviation engines within twenty years.”

“It turns out that only two years have passed, and I almost couldn't resist it…”

 His tone was full of emotion.

  Huaxia's development speed in aviation development is indeed 100 million points different from previous expectations.

 Happily, it's a good difference.

“It feels like it's time to put the construction of cabin No. 2 on the agenda...”

 “There's no need to be too anxious…”

Chang Haonan comforted the other party while waiting for the parameters to stabilize:

"The core engine of the Turbofan 10 should be the most powerful aviation gas turbine in our country for a long time. Even if a model with a large bypass ratio is developed in the future, it will not be able to have an afterburner at the back. "

“So...although it may not last for 20 years, it shouldn't be a big problem if it lasts for five or six years.”

 “Five or six years…”

 Obviously, Jiang Fuhe next to him did not get much comfort from this.

 He opened his mouth several times, but remained silent.

 First of all, I had to shout at the top of my lungs when speaking in this environment, which made me a little tired.

And I'm also afraid of hearing some inhuman words from the other party's mouth again.

  After all, today has already been a big blow...

 In a moment of anxious silence, the thrust curve that had been fluctuating just now gradually stabilized.

Since the principle of the afterburner is to inject fuel directly into the gas or airflow behind the fan for combustion to increase the afterburning speed, the thrust stability is definitely not as good as the intermediate thrust state.

 It's pretty good without too obvious ups and downs.

 As for the result, it was already expected for the two people.

 At best, it's just a verification.

“Sure enough, 14150±300 kilograms of force…”

 Jiang Fuhe took off his overalls hat and read out the number to himself.

 At this moment, he was completely relieved.

 (End of this chapter)

Chapter end