The military-industrial scientific research system of the academic master.

Chapter 1339: Some comrades, we have three types of propellants as strong as this...

Facts have proved that the shock brought by numerical monsters is often the simplest, yet the most direct.

After several minutes, Shen Fangzhong finally came to his senses.

However, before he could open his mouth, he heard Li Jianqiang's voice next to him:
"So this is how you achieve dual-pulse propulsion...directly controlling the operating parameters of the solid propellant without adding an additional compartment or layer to the missile structure?"

For a long time, the uncontrollability of solid fuel has basically been the underlying logic of the entire field of rocket propulsion.

It's like Newtonian dynamics to 19th century physics.

Therefore, the moment he saw the material just now, he even felt that his worldview was about to collapse.

It's like when physicists first saw Planck's black body formula and realized that "the world might be discontinuous."

"Of course not..."

Faced with this question, Lin Chenggang gave a very straightforward negative answer:
"About a dozen years ago, anti-ship missiles were still mainly rocket-powered... At that time, in order to increase the range, we considered the compartmentalized design you mentioned, allowing the missile to cruise at a low speed in the middle stage and then sprint at a high speed at the end."

"At that time, I had just started working. I designed a soft isolation device made of two layers of rubber wrapped around cork. The rubber fits tightly to the charge, and the igniter and the II pulse charge are connected together... But after testing, I found that the stability is too poor. There is about a 60% probability that the II pulse will start burning right after the I pulse, so it can't be put into practical use at all."

Even during the relatively barbaric period of development of China's military industry, it never gave up the pursuit of advanced concepts and technologies.

Even dual-pulse power, which seemed very advanced at the time, was not only researched by the Air Force Equipment Research Institute.

The conclusions of both sides are basically similar.

This is also why Lin Chenggang came up with the idea of ​​adding electrosensitive materials to the CT series propellants during the development process.

While Li Jianqiang was still digesting this information, Shen Fangzhong took over the conversation again:
"In your opinion, is it possible to use the same technology on the long-range air defense missiles equipped by the Air Force Ground-to-Air Missile Force?"

Lin Chenggang smiled mysteriously, and then took out the approval letter that was sent to him by the Construction Committee this morning:
"Actually, I was just about to go look for you guys..."

Shen Fangzhong lowered his head and quickly scanned the contents of the red-headed document.

I quickly caught the key words:

"Suggested by Academician Chang?"

Obviously, things went much better than he expected.

When he first saw Lin Chenggang, he was worried that he would not be able to spare enough energy to coordinate work with him in a short period of time.

It turned out to be completely unnecessary.

"Yes."

Lin Chenggang nodded:

"But my work relationship still needs to be here, and I can only participate in your project as a consultant..."

For Shen Fangzhong, this little thing was not even a request:
"We can agree to all these organizational requirements, and we will prioritize funding and manpower."

He directly gave a big guarantee:

"When can we start docking at the earliest?"

This posture actually made Lin Chenggang on the opposite side stunned.

I never expected the other party to be so urgent.

"It may take a while. There are still some risks in the strength of the charge column after it is formed."

There was a hint of embarrassment in his tone, so he added:

"But we have been working with the Torch Laboratory to conduct theoretical calculations on the work flow of the CTK series propellants to find out the root cause of the problem."

"Given their level, it shouldn't take too long..."

It seems to be to verify the correctness of this sentence.

Before Lin Chenggang could finish his last word, the red phone on the upper left corner of his desk rang loudly, interrupting the conversation between the three people.

He leaned over to take a look, then stretched out his hand and made a gesture to keep quiet.

"Hello, Professor Li..."

The call was, of course, from the Torch Laboratory.

Since Chang Haonan has been basically based in Huairou Science City recently, it was Li Yabo who had been in contact with Lin Chenggang before.

However, this time, a more mature voice sounded on the other end of the receiver: "It's me, Chang Haonan."

"Academician Chang?"

Lin Chenggang's body reacted faster than his brain. Even though there was a telephone line between them, he stood up straight in an instant:
"How did you..."

"The situation of your system is quite interesting. Huairou happens to have not much going on these two days, so I'll take some time to come and take a look."

There was a hint of smile in Chang Haonan's voice:

"It was just a coincidence that the result came out..."

Lin Chenggang has developed a strong resistance to words like "coincidence", "luck" and "by the way" from Chang Haonan, and he doesn't even believe a punctuation mark.

There must be some problem that Li Yabo couldn't solve, so he asked his mentor for support.

It's just that this is part of the internal play of the master's sect, so he shouldn't ask too much.

"Then I'll be there right away..."

Just as he was about to end the call, Lin Chenggang suddenly glanced at Shen Fangzhong and Li Jianqiang, who were looking confused across the desk:
"Academician Chang, Chief Engineer Shen Fangzhong, who is in charge of the development of the Hongqi 9 model at the Second Academy, and Director Li Jianqiang of the Air Force Equipment Research Institute are right here with me. Please see..."

Since he had said this, Chang Haonan naturally would not refuse:
"Come together."

……

Due to time constraints, Chang Haonan did not even have time to compile a complete analysis report, but instead received the group directly in the basement computer room of the computing center.

"Because it is not an ideal solution system and there is phase change during the working process, the entire calculation is relatively complicated and involves a lot of theoretical knowledge of physical chemistry, so I will make it short."

He then pulled up a simulation of a surface about 100 molecules thick:
"The secondary ignition failure actually involves two independent reasons, so it is normal that you, Cheng Gang, cannot draw a conclusion based on the macroscopic working parameters alone."

Lin Chenggang was a little confused for a moment, wondering whether he should feel gratified about this.

Fortunately, Chang Haonan didn't give him too much time to hesitate. He picked up a pen from the table next to him and pointed to a position on the map:
"In order to ensure that the control effect is obvious, you use three-dimensional porous polyvinyl alcohol as a binder to increase the resistance of the entire system, so that high-speed combustion can only be achieved when both high voltage and high pressure are met at the same time. You also use metal tungsten to adjust it. I think the idea is quite clear."

After just hearing the first sentence of the theme, Lin Chenggang was already standing there in a daze.

What the other party said was almost exactly the same as my own mental journey during development.

But he had never told anyone before.

"But this system is not only sensitive to voltage, but also to heat. Continuous exposure to high-temperature flames will cause melting, softening and chemical decomposition due to overheating. Therefore, in your test, the success rate of the first ignition in a cooling state is 100%, while the second ignition is prone to failure. This is why you can observe the cracking of the grain in the collected debris."

Lin Chenggang took a deep breath and suddenly realized something:

"No wonder..."

After waiting for a few minutes, Chang Haonan opened another calculation file and continued to introduce:
"On the other hand, tungsten has very good combustion and electrical properties, but its density is as high as 19.35... According to my calculations, during the mixing and stirring of the propellant components or the solidification of the slurry, about 70% of the tungsten powder will settle in the bottom 25% of the slurry mixture, which can easily lead to internal defects in the grain structure."

If the first half of the content left the three people confused, then the second half was relatively easy to understand.

Shen Fangzhong's expression immediately turned serious:
"Does this mean that the larger the volume of the bullet column, the greater the hidden dangers it will leave behind?"

The volume of the HQ-9 air defense missile is several times that of the short-range missiles used by the army. If what Chang Haonan said is true, then its application prospects are not very optimistic.

"This is inevitable."

The latter nodded:
"In fact, even if we don't consider the problem of tungsten powder, CTK-2 can only be ignited and burned by alternating current at a very small electrode spacing. For large propellants, an additional conductive layer needs to be coated, which further reduces the stability of the system..."

This conclusion inevitably made Shen Fangzhong, who had great expectations, feel a little disappointed.

He was about to say something else, but Chang Haonan changed the subject and spoke first:
"In fact, Researcher Lin's idea is already very successful."

"The substrate system of CTK-2 is not a big problem, especially the choice of hydroxylamine nitrate as the oxidant is very good. We only need to replace the adhesive with polyethylene glycol with a higher degree of polymerization and use boric acid as a cross-linking agent to significantly improve the mechanical strength and alleviate the melt softening problem while reducing the ignition power."

Shen Fangzhong reached out and touched his chest.

Such ups and downs in the plot were really too much for an old man like him to handle.

Lin Chenggang stared blankly at the result on the screen in front of him, and suddenly began to doubt the world:
"The tungsten powder..."

"That's another thing I want to say, and it's the most interesting part of your system."

Chang Haonan replied with interest:
“By simply adjusting the type and process of metal additives, we can develop at least three formulation systems with different properties suitable for different occasions based on the unified base of CTK-2…”

(End of this chapter)