Chapter 631 Afterburning!
Jiang Fuhe’s guess is naturally correct.
After Chang Haonan and he looked at each other in confusion for a while, they nodded:
"Although from a rigorous engineering perspective, after actually turning on the afterburner, Before I measure the data, I can’t guarantee what the situation will be like.”
“But...at least as far as my goal is concerned, it is indeed to increase the sea-level afterburner-to-weight ratio of the turbofan 10. Make it 9.”
At this point, perhaps he felt that what Jiang Fuhe just said might cause ambiguity, so he added:
"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 face reasons or for 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.
Almost of no practical significance, but both parties enjoyed it.
So, 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.
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.
At that stage, countries' publicity about equipment performance gradually became pragmatic, and many opportunistic habits in the past were gradually corrected.
More importantly, China has gradually begun to establish its own industrial discourse system and no longer completely follows foreign countries.
Although after 2010, with the gradual rise of Internet thinking, the habit of drawing pie on PPT has reappeared, both at home and abroad, and it is even crazier than during the Cold War, but at that time Chang Haonan’s Academic habits have been basically finalized and have been relatively little affected.
This is when some ideas that are “incompatible” with this era appeared.
On the other side, Jiang Fuhe immediately stood in awe after hearing Chang Haonan's explanation.
In his opinion, Chang Haonan is no longer just down-to-earth.
It’s entirely up to me to make things difficult for myself.
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."
At that time, if we change our thinking a little bit in publicity, we can directly say that our country's aerospace engines will directly jump from the second generation to the fourth generation level.
Chang Haonan himself can basically just wait to be evaluated as an academician.
But now...
"Hmm..."
"Huh?"
Thinking of this, Jiang Fuhe's train of thought stopped.
Because he suddenly realized...
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 evaluation...
"Alas..."
Jiang Fuhe sighed .
After all, it is narrow-minded.
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 man next to him The test commander asked Chang Haonan, and at the same time handed a temporarily typed performance report to the latter.
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.
Therefore, Chang Haonan still focused on the fuel consumption of the middle thrust.
For military models, economic efficiency and environmental protection level do not need to be considered. Fuel consumption more importantly affects the range of the aircraft.
In particular, the thrust of turbofan 10 has increased by about 10% compared to AL31F.
While greater thrust brings improved performance, it also means consuming more fuel during the same working time.
He turned the report to the other side and quickly found the numbers that interested him.
0.0745kg/(N·h)...
At this time, Jiang Fuhe, who had adjusted his mentality, also came over:
“This... is almost 6% lower than the fuel consumption of AL31F. %, considering the total pressure ratio of this engine of 25, it is quite amazing.”
Chang Haonan’s slightly tired face finally showed a slightly satisfied expression and nodded:
"Well, it can basically offset the increase in fuel consumption caused by the increase in thrust. It can be regarded as ensuring 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 intermediate thrust fuel consumption. Considering that the fuel consumption of the AL31F basic model, which is also optimized for afterburning, 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, there is no way to 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 turn on the afterburner."
If it was an aircraft engine that did not have full authority electronic control in the past, then all items must be determined before each test begins, and it would be difficult to add to it midway.
But for the turbofan 10, as long as there is no problem with the engine, just send one more command on the console.
“Yes!”
The test commander returned to his station, pointed at the microphone and ordered in a deep voice:
“Attention, everyone, start the afterburner. ! ”
The operator at the other end of the control room then pushed the simulated throttle valve to the final "afterburner" position in the control computer.
Almost at the same time as 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.
As 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's 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'll go..."
When Jiang Fuhe saw this scene, his whole body trembled:
"If the temperature of your tail flame were 50 higher ℃, I guess I have to forcefully 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 that I heard what the other party said, I realized that I had basically reached the upper limit of this platform...
Jiang Fuhe nodded dumbfounded:
“This was the case the year before last. When the platform was put into use, Academician Liu and I expected that it could support high-altitude simulation verification of aviation engines within 20 years.”
"It turns out that only two years have passed, and I almost couldn't resist it..."
His tone was full of emotion.
China’s development speed in aviation development is indeed 100 million points different from previous expectations.
Fortunately, it is 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 various parameters to stabilize:
"The core machine of the turbofan 10 will not be used for a long time. , it should be the most powerful aviation gas turbine in our country. Even if a model with a large bypass ratio is developed in the future, it will not be possible to have an afterburner at the back. "
"So... although 20. You may not be able to hold on for a year, but if you use it for five or six years, it shouldn’t be a big problem.”
“Five or six years...”
Obviously, Jiang Fuhe next to him didn't get much comfort from it.
He opened his mouth several times, but remained silent.
First of all, I have to shout at the top of my voice to speak in this environment, which makes me a little tired.
But I am also afraid of hearing some inhuman words from the other party's mouth again.
After all, today has 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 up and down.
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 the work cap on his head and read out the number to himself.
At this moment, he was completely relieved.
(End of this chapter)