Genius is just the threshold for me!

Summer has passed and early autumn has arrived; the summer vacation is coming to an end in the blink of an eye.

Last winter break, because of the spy's activities, all of us were left in the family compound and didn't go home. This summer, all of us went back to our hometown.

Even Lin Dong, who spent twenty days each at his grandparents' and maternal grandparents' homes during the summer vacation, gained two and a half pounds before returning to his residential compound.

Ding-dong-

[Xu Qingling]: School starts the day after tomorrow. I'll go back tomorrow, and I'll probably arrive tomorrow afternoon.

[Xu Qingling]: Today I went out with my parents to fish, camp, and have a picnic by the river in my hometown... Xu Ziming fishing.jpg/empty bucket.jpg/campsite.jpg

Lin Dong was lounging on the sofa in the living room, holding his laptop and enjoying the air conditioning. When he saw the message from Xu Qingling, especially the last few photos, he smiled and opened his keyboard to reply.

[Lin Dong]: Tell Uncle Xu to take his annual leave and he can take it without worry. He doesn't need to work overtime or deal with the Air Force anymore.

[Xu Qingling]: You should tell him that...

[Lin Dong]: Then let me know if his bucket is still empty after he finishes fishing, and I'll call Uncle Xu.

[Xu Qingling]: Oh, if you really say that, he'll get angry...

[Lin Dong]: I was just kidding.

Lin Dong chatted with Xu Qingling for a while, then turned off his phone and looked back at the laptop in front of him, continuing to think about the design scheme for the rotating detonation engine.

After two months of study and reflection, Lin Dong finally determined three solutions to address the challenges of thermal protection management in the combustion chamber of a rotating detonation engine.

One method is ablation protection, which involves lining the combustion chamber wall with a layer of ablation material.

In this way, at high temperatures, the ablation material absorbs heat and decomposes, melts, or even vaporizes, carrying away a large amount of heat and protecting the structure of the combustion chamber.

However, the downside is that the lifespan is not very long; often, the entire ablation layer is consumed in less than eighty hours.

This requires special design, such as designing the combustion chamber as an easy-to-disassemble and replaceable structure, so that it can be replaced at any time.

One approach involves using a high-temperature resistant powder alloy for the combustion chamber, followed by the deposition of a high-temperature resistant ceramic coating, and then combining it with cooling pipes for robust resistance. Lin Dong has identified tantalum carbide hafnium-resistant ceramic as the target material for this approach.

Tantalum hafnium carbide is a solid solution of hafnium carbide and tantalum carbide. Its melting point in a vacuum or inert gas environment is as high as 4,000 degrees Celsius, and its melting point in an oxygen environment can reach close to 3,000 degrees Celsius, which is enough to withstand the extreme high temperature heat flow of a rotating detonation engine.

However, the downside is that while it can withstand high temperatures, it cannot withstand the continuous detonation impact of a rotating detonation engine.

To use this approach, the coating must employ a special process and coating structure, which requires extensive testing and data collection to determine.

The last one is a sweating design based on the hollow air-cooled design of the Emei project, which involves processing a porous combustion chamber wall.

Then, coolant is injected and pressurized to "seep out" from the wall to form a fully covered cooling film.

At the same time, the coolant evaporates and undergoes a phase change in the porous medium, absorbing and carrying away the heat that has invaded the combustion chamber structure.

However, the downside is that the pore walls are prone to carbon buildup and blockage, and the coolant may also affect the stability of the detonation wave.

"The three proposed directions... still need to be tested."

Lin Dong thought about it carefully.

To refine the three plans and determine which plan will succeed, actual testing is essential.

The combustion chamber design of the first scheme and whether the coolant in the third scheme interferes with the stability of the detonation wave need to be tested by 624.

We need to ask Xu Ziming for help with which ablation material to use for the first plan and the testing for the second plan.

Once the protection scheme for the entire combustion chamber is finalized, the engine design can proceed formally.

"A detonation engine that can reach speeds of Mach 15 or even 16 is truly a challenge that should not be underestimated. Every aspect is a test of the limits of materials."

"Even a slight difference in materials can increase the difficulty of the project by a hundred percent, a thousand percent..."

Lin Dong muttered a few complaints in his mind.

This rotating detonation engine was definitely the most difficult project he encountered in his research, and many of the difficulties were related to materials rather than design.

Although the previous scramjet engine was difficult, every few steps were a breakthrough in uncharted technological territory.

However, with careful thought and the use of soul perception explosion, it is still possible to quickly find a way of thinking and direction.

This rotating detonation engine not only breaks through uncharted technological territory, but also faces the most fundamental material challenges in its early stages.

If we want to bypass the material issue, the design difficulty of the entire solution will increase by a hundred or a thousand times.

"We still need to improve and advance it step by step, just like with the scramjet engine. However, with the assistance of the 624 research team, the combustion chamber protection scheme has been finalized, which will speed up the whole process."

"That way, once Qingling returns tomorrow, and everyone has finished their rest and returned to their posts, this major bombing project can begin."

Lin Dong mentally reviewed his recent plans. The R&D funding for the Big Bomb project had been transferred from headquarters in early August.

However, after discussing it with Wang Xingguo and assessing the personnel's condition, he felt that the core personnel were under some mental strain after working on the WZ-8 and J-16D projects from last year to the first half of this year, coupled with the spy's family search plan. It would be best for them to take a good rest during the summer vacation.

After all, if you spin a top too hard all at once, you're really afraid it will fall apart. If headquarters launches a surprise attack on Chengdu Aircraft Industry Group by Shenyang Aircraft Corporation, that would be a huge joke.

Anyway, the pledge for the Big Bomb Project is for three years, but Lin Dong estimates that it will take more than two and a half years, so one month of collective rest time won't make a difference.

Ding-dong-

Just as Lin Dong was designing the scheme to shut down the rotating detonation engine and preparing to do his daily paper work...

At that moment, Wang Xingguo opened his mailbox, which was hanging to the side, and a brand new email popped up.

"Hmm... an email from an external organization?"

Lin Dong noticed that the new email had a different icon than the intranet emails, so he moved the mouse and clicked to open the email content.

[Chief Engineer Wei from Institute 712]: Hello, Chief Engineer Wang, our institute has encountered some technical difficulties with a high-power, fast and stable power supply system.

I just saw a paper published on the intranet by Engineer Huang from Chengdu Aircraft Industry Group (CAC) about the design of a high-power centralized stable power supply system. Based on the following parameters, can CAC's solution and technology meet the requirements?

"Institute 712, the Wuhan Marine Electric Propulsion Research Institute under China Shipbuilding Group?"

Lin Dong thought for a moment, then said with a strange expression, "You want to study a high-power, fast, and stable power supply system? Could it be the electromagnetic catapult power supply system of the Fujian?"

Lin Dong noticed that the data document attached to the email was locked, realizing that the file and password had been sent separately. He picked up his secure phone to call Wang Xingguo when a message popped up.

【001】：The password for the email attachment in 712 is... standard encryption, no time lock, no need to rush, just forward it to Engineer Huang after you finish reading it.

【56】: Received

Lin Dong replied to the message, opened the attached file in the email, and entered the password. Immediately, a file containing various data popped up.

"Stable power supply, millisecond-level response and release... This doesn't seem like an electromagnetic catapult. After all, no aircraft can stop an electromagnetic catapult that releases in milliseconds."

Lin Dong carefully examined the data in some documents, pondered for a while, and suddenly realized something. He opened his eyes wide and said, "This is an electromagnetic railgun? The 936 ship electromagnetic railgun project?"

Millisecond-level response and release is a very obvious technical indicator; only electromagnetic railguns have such a response and release requirement.

In Lin Dong's memory, the electromagnetic railgun of the 936 ship in his previous life was unveiled in 2018. At that time, he had just entered college, and his roommates were so excited that they were howling like ghosts.

The test parameters at the time indicated that a single shot could travel 200 kilometers, with a projectile speed of Mach 8 per second, capable of penetrating the armor of a ship.

Even more outrageous is that the projectiles of the electromagnetic railgun also have built-in guidance chips that are resistant to high overload, which can correct the trajectory at the terminal stage and reduce the error rate to less than 10 meters.

This is the closest weapon to science fiction that I have ever seen in reality, based on my knowledge from my previous life.

"I didn't expect that electromagnetic railgun development would begin so soon..."

Lin Dong glanced at the time—late August 2013—and couldn't help but sigh, "It's a pity we don't have room-temperature superconducting materials."

Each time this electromagnetic railgun fires, it generates a huge amount of heat due to the resistance, resulting in a very long cooling time.

Otherwise, the modern navy might have to follow a retro trend and return to the era of battleships exchanging cannon fire...

Lin Dong reviewed the data requirements again, and after confirming that there were no problems, he attached the password and forwarded it to Engineer Huang of Chengdu Aircraft Industry Group via the intranet.

Although he considered this issue to be just a matter of an email, Chengdu Aircraft Industry Group had dedicated personnel responsible for the research and development of the power supply system, and the power supply solution for the J-16D was also developed by Engineer Huang. With oxen and horses available to take over, he naturally didn't need to worry about it himself.