Chapter 1182 Explosion membrane rupture test
The JF-X mentioned by Jiang Zonglin is just a miniature wind tunnel 22 meters long, 0.2 meters thick, and with an effective volume of 1,200 liters.
It can even be placed in an ordinary room.
Obviously, JF-X of this size is basically unable to undertake any applied scientific research tasks, but it has designed an extremely complete wind tunnel including a hydrogen/oxygen gas filling system, a large vacuum unit in the test section, an ignition and detonation system, a data acquisition system, etc. structure.
And only a very small number of parts need to be replaced, and it can be flexibly adjusted between the two working modes of forward detonation and reverse detonation, and can adapt to scaled-down wind tunnel testing under most basic conditions.
At the same time, thanks to the relatively compact size of JF-X, the difficulty of conducting experiments on it is much lower.
Therefore, in less than two months, Jiang Zonglin and his team completed a set of forward detonation drivers, as well as the corresponding shock tube and critical nozzle, according to the previously determined design method.
So, when Chang Haonan, who had just returned to the capital from Haojing, received a call saying that the Institute of Mechanics was ready to conduct the first test and invited him to participate on site, he almost thought that he had made a mistake because he was too involved in the work. Date…
Fortunately, the actual situation was explained quickly——
The purpose of this test is to verify the accuracy of the design method, not to actually launch JF14 ahead of schedule.
Originally, Chang Haonan adopted a task-driven management model that was more able to give full play to the subjective initiative of each unit for each subsystem of the entire Gaogao project.
That is to say, set stage goals and provide necessary support, but do not dictate too many specific work processes and methods.
But now he was about to return to the capital, and the other party took the initiative to invite him, so he was happy to be a witness.
……
In a laboratory in the corner of the first floor of the Institute of Mechanics, Chang Haonan saw up close the JF-X wind tunnel that was about to be used for testing.
"This wind tunnel was jointly developed by us and North University of China. We ordered two units in total and deployed them in Beijing and Bingzhou..."
Jiang Zonglin took Chang Haonan around and introduced the basic situation of JF-X:
"Actually, given the situation at the time, it was unlikely that we would be able to use such a small-scale scaled-down wind tunnel. Several comrades and I were opposed to spending this money... Looking back now, it is still a bit short-sighted."< br>
"Academician Chang, look."
As he spoke, he took two steps forward and pointed to a metal pipe section in the front of the main structure of the wind tunnel that was obviously different in shape and material:
"This is the detonation driving section we designed. Because it is driven in the forward direction, there is no need for a venting section... The total length including the shock wave reflection cavity and the auxiliary detonation section is 6.44m. It uses PCrNi3MoV gun steel and the inner diameter of the tube is Φ126mm. , wall thickness is 57mm, design pressure is 75MPa, and the maximum working temperature it can withstand is 5000-5500K..."
"..."
Just as he was explaining the specific situation to Chang Haonan, two other technicians had bolted a circular diaphragm with prefabricated cross grooves on the surface between the shock wave reflection cavity and the auxiliary detonation section.
"Don't underestimate this cross-slotted diaphragm."
When Jiang Zonglin said this, his tone was full of pride.
But before he could continue speaking, Chang Haonan continued:
"I know that the outlet of the detonation drive section will be strongly impacted by the detonation wave, so the metal diaphragm must not only withstand the initial pressure, but also ensure that it can be fully opened after ignition and detonation, but cannot be completely sheared off. The fragments generated...we...are the result of several generations of research by the Institute of Mechanics, including Mr. Guo Yonghuai, Academician Yu, and you, Researcher Jiang. The cost is extremely low and the effect is better than similar foreign technologies..."
Although he has never seen the JF-X wind tunnel itself before, the detonation drive diaphragm is extremely familiar to Chang Haonan.
It can be said that there are countless treasures.
He could even report directly that the one installed just now was an A5 diaphragm with a total thickness of 8.40mm, a groove depth of 1.85mm, and a membrane rupture pressure of 15.364MPa.
I was just worried that my performance was too outrageous, so I swallowed back the words that were already on my lips.
However, even so, it was enough to make the other party stunned.
"I was negligent."
After maintaining a dumbfounded expression for a while, Jiang Zonglin patted his forehead:
"Academician Chang must have understood the relevant situation before he came..."
Chang Haonan smiled and did not comment.
Maintaining such a profound sense of mystery clearly helps him carry out his work.
"Let's continue to introduce the preparations for the test."
Jiang Zonglin nodded:
"However, in our test today, this diaphragm only serves to cross-verify the outlet pressure together with the pressure sensor. According to our calculation results, the shock wave generated by the last hydrogen-oxygen detonation of JF-X can be completely Breaking through the A2-A4 diaphragms will only have a partial membrane-breaking effect on the A5 and A6 diaphragms, and it will not be able to break through at all..."
At this time, several staff members used a trolley to drag two green and sky blue gas bottles from the next room, and connected a rubber tube to each side of the laboratory.
Immediately afterwards, the sound of an air pump could be heard in the room.
Jiang Zonglin's introduction was also interrupted at the same time.
"Academician Chang, we have started to inflate the drive section now. Let's go to the control room to observe the situation..."
When the two changed into lab coats and came to the control room separated by a wall, the inflation process on the screen had entered a stable stage.
Chang Haonan glanced at the online monitoring instrument next to him and found that the gas source pressure set in the hydrogen throat was 5.5MPa, while the inflation pressure set in the oxygen throat was 4.1MPa.
Considering the diameter difference between the two, the volume ratio is exactly about 2:1.
A few minutes later, the three red lights on the operating table turned green at the same time, indicating that the wind tunnel was ready to start ignition.
"Academician Chang, why don't you come?"
Jiang Zonglin gestured towards the button labeled "Start" on the console.
Chang Haonan hesitated for a moment, but did not shirk.
Since his rebirth, he has not done similar work for almost ten years. It's good to recall...
With this thought in mind, Chang Haonan stepped forward, pressed his right index finger on the surface of the button, and waited for the operator next to him to start counting down.
However, before someone read out the first number, he heard an obvious intake of breath.
He turned around and took a look, only to find that Jiang Zonglin had a determined expression on his face as he was about to go to the examination room.
This made him almost laugh:
"Researcher Jiang, I'm not even nervous. Why are you nervous?"
Jiang Zonglin, who was a little unable to hold himself back, rolled his eyes secretly and said to himself, "You have never seen big winds and waves, so of course you are not nervous about this small scene."
But this is the first time that I use the algorithm I derived and analyzed to guide the design work. The psychological burden is of course different...
However, he felt a lot more relieved after being interrupted by Chang Haonan.
"3..."
Jiang Zonglin began to count down in a deep voice:
"2...1..."
"Start!"
Following his order, Chang Haonan pressed the button that was familiar yet unfamiliar to him.
The next moment, inside the drive section, a wisp of light blue arc light burst out from the tip of the electrode at the ignition point, touching the already fused gas in the container.
The hydrogen and oxygen mixed together in the most perfect proportion bloomed with dazzling light, like a fanatical flame elf, turning the entire space into an extremely gorgeous fireball.
The temperature of nearly 4000K and the shock wave exceeding ten times the speed of sound caused the air pressure to instantly reach hundreds of times its original level.
Originally, this process should only last a few microseconds.
But just when the peak pressure caused by gas detonation is about to decrease, the peak of the shock wave just reaches the inside of the shock wave reflection cavity, spreading the pressure relatively smoothly over the next few tens of milliseconds...
"Poof——"
For everyone in the control room, they could only hear the faint sound of the gas being ignited.
However, although no one can observe the situation inside the wind tunnel, the pre-set sensors have faithfully fed back the data to the computer screen next door.
After less than 0.1 seconds, everything returned to calm.
"Hoo——"
Looking at the room pressure curve in front of him, Jiang Zonglin breathed a sigh of relief.
Equilibrium pressure 8.753Mpa, peak pressure 15.8474MPa, steady state duration 5.631s......
The difference from his previous calculation was very small.
It fluctuates around 10%.
For an act powered by explosions, this is an incredible amount of precision.
About twenty minutes later, the technicians who returned to the wind tunnel laboratory removed the metal diaphragm at the exit of the shock wave reflector cavity.
The cross groove has been broken open by air pressure, but it has not been completely broken.
The data recorded on the computer just now was completely verified.
Jiang Zonglin's expression finally relaxed completely.
Sparse applause sounded in the control room.
But then, it became like a tidal wave.
There were even a few cheers mixed in.
Although for rigorous considerations, a series of supplementary experiments under different conditions will be needed later, this good start at least means that the entire design method is correct.
For Chang Haonan, he felt more satisfied than happy at this time.
A kind of satisfaction after eliminating obsession.
"Congratulations, Researcher Jiang."
He smiled and held out his hand.
Although Jiang Zonglin was still immersed in excitement, he still held Chang Haonan tightly with both hands:
"..."
No words were spoken.
However, everything is left unsaid.
(End of chapter)