Chapter 630: Isn’t it right? The ratio of recommendation to weight is really 9?
For a brand-new engine like the Turbofan 10, the high-altitude test process is still relatively complicated.
Just the various 0-altitude ground conditions from idle to low speed took nearly a week to complete.
This is still under the condition that all projects have been completed in one go and almost no accidents have occurred.
“Mr. Chang, should we start measuring the high-speed working conditions today?”
Jiang Fuhe looked at Chang Haonan, who was instructing the technicians to adjust the test data, with some enthusiasm in his tone.
Although aerospace engines have various performance indicators, it is impossible to describe the performance with just one or a few numbers.
But even an industry insider like him cannot avoid focusing on performance such as intermediate thrust and maximum afterburner thrust.
It can even be said that Jiang Fuhe has been looking forward to it from the first day when the B0101 prototype was transported to Institute 624.
After all, this is still a key indicator for grading aero engines.
"Well, today we will first gradually increase the speed to the maximum in stages. If the minimum continuous stabilization time can be met, then the working condition of the afterburner will also be removed. But strictly speaking, I'm afraid..."
Chang Haonan turned his head and glanced at the watch hanging on the wall next to him:
"I'm afraid it won't be completed until early tomorrow morning."
Having said this, he rubbed it again because Temples that are a little swollen due to continuous work:
“If everything goes well, we should be able to completely complete the sea level performance by the end of August. After that, we will gradually increase the simulation height and the pressure will be slightly smaller...”
While the two were talking, the test over there had already begun.
Different from the idle operating conditions tested in the previous few days, when the compressor speed is increased, the sharp roar of the engine can be heard even in the control room.
Although it was not deafening, Jiang Fuhe couldn't help but raise his voice:
"Mr. Chang is still humble."
He shook his head:
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"To be honest, these projects you have hosted should be the smoothest ones that I have seen in more than 30 years of work. Whether it is research and development or testing, the process is the smoothest..."
"I have almost no impression of it. What kind of rework has occurred, including the previous turbojet 14? Although it was repeated several times, it was all in the early years. After you participated, it almost went all the way to finalization..."
Actual Before Chang Haonan came over, Jiang Fuhe even had the tangled thought of wanting to see each other's jokes.
Mainly, he feels that the former is a bit unreasonable.
In industrial design, many times the initial parameters are guessed based on experience, and then iterations are constantly adjusted based on test results.
It is normal to have several iterations in this process.
Just like social progress is also an upward spiral.
On the contrary, going through this kind of thing over and over again was basically a situation that could only be encountered if you were extremely lucky.
Explanation: The initial parameters were chosen very well.
However, Chang Haonan completely rubbed these past common senses on the ground.
How have these projects of his ever spiraled?
They all rise straight up like a rocket!
Jiang Fuhe is not someone who works behind closed doors. Naturally, he has also tried the other party’s research methods and tools such as TORC Multiphysics.
It turns out that although the work efficiency has indeed been greatly improved, to put it bluntly, it is still the same iterative calculation, but the spiral speed is faster.
It is far from the magical level of being able to pass the test directly from the drawings to the test workshop.
Therefore, he believed that Chang Haonan's level was unreasonable.
Ten points or even nine points are unreasonable.
If you have always relied on strong luck before, then no matter what, with a project as complex as the Turbofan 10, you should have accumulated enough risks, right?
And if it weren't for luck...
Then Jiang Fuhe would begin to wonder if there was something wrong with his worldview.
Now the test has started for a week.
The results are obvious.
Chang Haonan did not lose, but his worldview lost...
Thinking of this, Jiang Fuhe sighed:
“Sometimes, Mr. Chang, how you make me feel It’s not like developing a new model, it’s like directly taking over an already mature model.”
He may not have thought that this unintentional remark was actually infinitely close to the truth...
In fact, when Chang Haonan was working on other small projects, the process was similar to others, and he had to go through continuous processes. Only through trial and error can you find the correct design range.
The most I can do is rely on richer experience to make the process faster without making any big mistakes.
However, on key projects such as the turbofan 10 and the die forging press...
He is cheating.
As Jiang Fuhe just said, the system can provide all the parameters of a mature model.
Except for the time when I was really anxious when designing TORCH Multiphysics, I would not take out the results directly, but would go through the research and development process again... If you really want to talk about it, for today's Chang Hao In the south, there are only a few projects that are directly cheated.
However, most people will only pay attention to such large projects.
As for "small" jobs such as the Air Police 200 early warning aircraft, many times his name is not even displayed in a conspicuous position, and not many people know about it.
As for the work done in the name of Torch Group, it is impossible for outsiders to know the specific division of labor.
So, the only ones that left a deep impression on everyone were these cheating parts...
"This..."
Chang Haonan touched Touched his chin:
“On the one hand, it’s luck, on the other hand... maybe I have a special talent, and I am always unexpectedly accurate when choosing design parameters.”
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"But in the final analysis, this kind of thing is still unreliable, so no matter what happened in the past, there must be no missing testing process, otherwise it will be troublesome if something goes wrong..."
He can't directly He admitted that he was cheating, so he had to use "special talent" to explain it.
"Okay..."
Jiang Fuhe was stunned for a while, and finally sighed with a little helplessness.
Just consider it as the foundation of the worldview...
...
Today’s test process was as smooth as before.
Originally, pushing the speed of an aircraft engine should be a thrilling process.
Whether it is China or abroad, if most aviation engines have any major problems, such as fires and explosions, it basically happens during this process.
But in the case of Turbofan 10, it is monotonous and makes people feel sleepy.
If it weren't for the constant high-frequency roaring in his ears, Jiang Fuhe might really have fallen asleep.
After all, after the high-altitude platform equipment is turned on, whether it is command or operation, it has no direct relationship with him.
20%……
40%……
60%……
80%...
As the engine enters the experiment again and again, the N2 speed to which the high-pressure compressor is pushed continues to increase, gradually approaching the upper limit of the set operating speed.
On the screen displaying the test data, the thrust curve also increased all the way from the initial 145kgF.
In the end, without turning on the afterburner, the stable sea level thrust corresponding to the maximum speed stayed at 8410kgF.
8.41 tons!
"Hiss..."
Looking at the thrust value on the screen in front of him that was so smooth that it was close to a straight line, Jiang Fuhe was suddenly shocked and woke up:
"So accurate?"
As an aviation engine designer, compared to the inferred value of 8.4 tons itself, he was more surprised by the consistency between the actual test results and the paper values during the design process.
Jiang Fuhe clearly remembered that in the expected parameter manual sent to Institute 624 along with the B0101 prototype before the test, the intermediate thrust was calibrated to 8400kgF.
The 10 kilogram difference can be ignored as a test error.
"If you think about it this way..."
He turned his head stiffly and looked at Chang Haonan, who was standing not far behind him:
"Mr. Chang, you The thrust-to-weight ratio of the 'first-stage turbofan engine' is 9... maybe it can't really reach 9?"
"Huh?"
The latter had been spinning around all day, but when he was suddenly asked this question, he was a little bit unresponsive:
"Then...what else?"
Jiang Fuhe was also shocked by this rhetorical question. Blinded.
It took a while before he came back to his senses:
“Whether it is domestic or foreign, generally speaking, the recommendation weight is between 8 and 9, and the default is between 9 and 9. He said that his weight ratio is 10 levels...after all, he still needs to leave room for publicity for subsequent improved models. ”
"Just like the AL31F and F110 engines, although they both claim to have a thrust-to-weight ratio of 8, the actual thrust-to-weight ratios of the basic models calculated according to our national standards are only about 7.0 and 7.3 respectively. They are new sub-models until recent years. , it really reaches a thrust-to-weight ratio of about 7.6."
"But this turbofan 10... Although the afterburner has not been turned on, I estimate that based on your calibration accuracy, the actual measured maximum acceleration is. The thrust force should really reach 14 tons..."
(End of this chapter)