Chapter 353 Fuel God's Selection
Now that the propellant performance has improved, the environment for the throat liner is undoubtedly harsh, and the degree of deterioration is not even a little bit.
So, wow!
This is a bad thing brought about by a good thing. Originally, everyone just made do with it, so let’s just make do with it.
In the end, we agreed to make do with it together, but you actually rolled it up secretly?
The cause of the problem, Mr. Song and his colleagues basically immediately thought of, system engineering, it is not possible to improve by leaps and bounds by improving one item alone, the correlation between them is too great.
They are not too worried if they find out the reason. The person who tied the bell needs to be untied, so just ask someone.
Some of the group of people continued to conduct experiments, while others analyzed the data. Mr. Song made a call to Gao Zhendong.
Mr. Song remembers that when the first graphite throat lining was developed, a classmate of Consultant Gao, a young man named Lin, brought back several material recommendations that could be used for this purpose. Finally, Considering the price and weight issues, I chose to find graphite produced by the Carbon Research Institute.
Since Consultant Gao has so many recommendations, I think he is quite confident about this issue.
After hearing the situation here, Gao Zhendong smiled and said: "Yes, yes, yes, there is such a problem with the throat lining material, and the high-performance propellant has an impact on it."
Mr. Song heard this , half relieved: "Director Gao, since you have discovered this problem, have you solved it or found a replacement?"
Gao Zhendong thought for a while and said: "There are two recommendations, You can consider it. ”
Gao Consultant is stable, and he can only choose between two recommendations.
I heard Gao Zhendong say from the opposite side: "First, I have an alloy material here with a melting point of 2600 degrees and good mechanical strength."
Melting point 2600? Good mechanical strength? That's it.
“I want this, I want this.” Mr. Song said hurriedly.
Gao Zhendong smiled and said: "Don't worry, listen to me. The problem with this material is that it is heavy, with a specific gravity of about 15, and secondly, it is expensive."
A few decades later, the price of molybdenum will be 6 to 10 times more expensive than copper, let alone these days.
These words made Mr. Song deep in thought. Simply focusing is not a problem. Now that we have a new propellant, we are confident. Although it may bring about a change in focus, it is not a big problem. It can be Adjustment.
Simply being expensive is a problem, but it is not unbearable. There are no cheap missiles these days.
Look where are the missiles? These are all missiles in the greenhouse. Sorry, they are colluding.
But it’s expensive and heavy, so it’s not good. Well, let’s look at the second option. If it doesn’t work, use it again.
“Second, you can go to your old relationship, the Carbon Research Institute. This problem has actually been discovered a long time ago, and they have come up with a better substitute, which is also graphite. Material, under 5Mpa, combustion chamber temperature of 3000 degrees Celsius, the average ablation rate in 60s is 0.0XXmm/s. If appropriate, you can basically achieve seamless replacement. "
The combustion chamber temperature here, It is not the gas temperature, it is higher than the gas temperature, but for Mr. Song, it is enough to calculate the performance.
Since they are all based on graphite, the density difference will not be particularly large. Based on this, as long as it can be used, this thing is the first choice.
Mr. Song immediately understood that Consultant Gao must have contributed to this material, otherwise he would not have known it so clearly.
After careful mental calculation, this graphite material should be suitable. Mr. Song was in a happy mood. This problem was discovered and solved quickly. The comrades in the material field did an outstanding job.
"Thank you, Consultant Gao, your few words have solved our big problem and saved us a lot of time."
This matter is not a roadblock, after all, it has already been resolved We have reached this point, and we have to solve it no matter what. Otherwise, wouldn’t the propellant be in vain?
This matter is not too difficult. At the most, if weight is traded for performance, there is still a way to go.
However, the most important time is actually saved. Otherwise, if it is delayed for a period of time, it may be gone in a month or two. This does not include the use of other technical means. impact on the entire system.
Consultant Gao is reliable! While sighing and thanking Mr. Song, he hung up the phone and made a happy call to the Carbon Research Institute.
After getting the exact news from the Carbon Research Institute, he returned to the test site with a smile and reported good news to the busy comrades: "Comrades, I want to tell you some good news. This The problem of the nozzle throat lining has been initially solved after consulting many units and with the joint efforts of our external technical support and comrades from the Northeast Carbon Research Institute.”
All! The comrades were a little stunned. They had never enjoyed this kind of treatment where problems were solved in the blink of an eye. Is this true?
After being stunned for a while, everyone came to their senses and cheered together.
Mr. Song made everyone happy for a while, then smiled and said: "Now, the comrades in charge of structural design will recalculate the weight distribution and other designs based on the new material parameters sent by the Carbon Research Institute, and carry out After making the necessary corrections, send it to the Carbon Research Institute and they will process it for us."
After finishing speaking, he added: "I'll go find the model chief. Everything is ready and all I need is Dongfeng. , Next step, we are going to prepare for the full telemetry bomb!”
——
A researcher at a chemical research institute is measuring a sample using iodometric titration.
Although the sample was sealed, there was still a hint of fishy smell, but he couldn't smell it protected by the protective clothing and mask.
As the titrant is dripped in, the indicator develops color and the titration reaches the end point. The researchers began to take the titration data and calculate something.
The data is not complicated. Calculated by hand, they have two DJS-60Ds, but with this level of data, there is no need to bother that baby.
Soon, the eyes behind the mask leaked a hint of joy. He finished the experiment, packed up the test equipment, cleaned it, and walked to an office with the experimental data.
In the office, several people were communicating about something.
"Researcher Yue, the titration results have come out. Combined with other test results, the yield of unimformed dimethylhydrazine has reached 45.3%!"
Researcher Yue was overjoyed when he heard this: "It seems The choice of this liquid phase chloramine method is correct, as it can synthesize unidimethylhydrazine with much higher safety and good yield. "
The earliest unidimethylhydrazine, such as in 1936, There are reports of the use of dimethylamine nitrosation method, which is essentially reduction with nitrosodimethylamine, which is a carcinogen.
Later, it was useful to use the gas phase chlorine-ammonia method. The advantage is that the reaction rate is fast, but the process is highly toxic and the reaction is difficult to control.
Originally, our earliest undimethylhydrazine was born in 1968. The scientific researchers at that time directly took the risk and directly studied the use of liquid-phase chloramine method to synthesize undimethylhydrazine, which was a success.
Although the toxicity of the product itself cannot be changed, it can at least reduce the toxicity during the production process.
Now that this matter has been brought forward so much, scientific researchers still choose this path.
In principle, liquid chlorine, liquid ammonia, dimethylamine, and sodium hydroxide are used as raw materials. They can be mixed and reacted at room temperature. To a certain extent, this is much easier to control than gaseous ones. .
If synthesized in small batches in the laboratory, ammonia, sodium hypochlorite, ammonium chloride, dimethylamine, and sodium hydroxide can be used instead, eliminating the step of generating sodium hypochlorite from liquid chlorine and sodium hydroxide.
It can also be seen from here that there are obvious differences between laboratory production and industrial production.
After finishing speaking, Researcher Yue turned to tell other researchers: "You should distill and concentrate the product as soon as possible, and at the same time continue to synthesize it using existing methods, and strive to produce a batch of high-purity products that can be used for physical and chemical testing as soon as possible. Dimethylhydrazine is here."
After arranging the work, he went to the confidential room and made a call: "Lao Cai, please come over. Dimethylhydrazine has been initially synthesized, and the situation is relatively optimistic. ”
Mr. Cai was overjoyed when he heard this and moved really fast.
He was very anxious and rushed to Researcher Yue's side on the third day. These days, this speed is absolutely amazing.
By the time he arrived, the first batch of physical and chemical tests on high-purity unbiased dimethylhydrazine had been completed, and all he needed to do was read the report.
This report made him smile from ear to ear.
Freezing point, -57.2 degrees Celsius, OK, it can be used in the north!
Boiling point, 63.1 degrees Celsius, better, can be used in the south!
The specific gravity is 0.79 (20 degrees Celsius), which is about the same as alcohol and kerosene. This is good. At least the load-bearing structure of the fuel tank saves a lot of trouble, but I don’t know if the material needs to be changed.
The heat of combustion is 19000kJ/kg. It’s a bit low, so that’s okay. Let’s look at the specific impulse.
Specific impulse, 260s, that’s it, that’s it.
Seeing that he was grinning from ear to ear, Researcher Yue handed over another report: "There is something else that will make you happy. Take a look. I didn't expect this result."
This is a stability test report. The parameters and data are skipped. The conclusion part makes Mr. Cai extremely happy - it has good thermal stability and is not sensitive to friction, impact, gunfire, compression, vibration, etc.
Fu Fu, I didn’t expect Fu Fu to have such a good temper.
For Mr. Cai, this means that as long as it does not leak out, the storage and transportation of this thing are very safe.
To be honest, there is a reason why Lao Maozi has been using this thing until the 21st century. Toxicity to them? What is toxicity? At least it can ensure that no one drinks it, right?
Besides being toxic and slightly more complicated to maintain, this thing is a perfect choice for silo-launched missile fuel.
Looking at the contentment on his face, Researcher Yue smiled and said: "Look at the back. To be honest, I don't even know how talented the comrade who recommended this thing to you is, or whether he has mastered it. How much knowledge can I recommend to you? It’s tailor-made for you.”
Mr. Cai continued to look back and smiled even more happily.
Compatibility - aluminum, aluminum alloy, stainless steel, good compatibility.
Compatibility is not solubility, compatibility means that two things can get along well together. In human terms, it means: aluminum alloy containers and stainless steel containers can hold this thing.
No, I have to call Comrade Gao Zhendong. I’m so happy that I can’t help it!
(End of this chapter)