Zhengxin Power Company has been divided in two.

In order to ensure the research and development of new submarine power, the 920524 side sent a large number of R&D engineers to cooperate with Zhengxin. And for the secrecy of the R&D project, the army and the national security department have also discharged a large number of manpower.

In view of the company's other R&D projects, Li Fanyu had no choice but to order the existing business of the power company to be divested, set up a separate R&D department specifically responsible for submarine power, and let Zhengxin Industrial Base vacate a processing workshop to be fully responsible for the trial production of test parts.

In just over half a month, Li Fanyu has already relied on his own and his team's efforts to complete the pump-jet propulsion system and motor part of the Han-class attack nuclear submarine and the Kilo-class conventionally powered submarine.

This aspect of permanent magnet motor is a piece of cake for Zhengxin, and it has mastered the core technology. The motors used in automobiles and submarines are essentially the same, but the difference is only in the amount of output power.

But even so, Li Fanyu still further optimized the design of the volumetric power expansion version of Zhengxin LS rare earth permanent magnet motor. Make it quieter and more energy efficient.

In fact, although the structure of the Han-class nuclear submarine is relatively more complex, it is relatively easy for Li Fanyu. After all, there is no need to make much improvement to the entire power system, only the power of the cooling pumping system, which is embedded in the nuclear reactor like a major artery, from a noisy diesel engine to an electric one.

The more troublesome ones are the Kilo-class conventionally powered submarines.

Although Li Fanyu's proposition is to add fuel cells to the Kilo class, this does not mean that the power of the submarine is completely supported by fuel cells.

Space in submarines is limited, and fuel cells require large gas storage tanks with harsh storage conditions. It is impossible to support the long endurance of the submarine.

Li Fanyu meant that the driving mode of the Kilo-class submarine was changed to the same as that of the five-series sedan, and it was divided into a silent mode and a maximum speed mode.

In silent mode, the power source of the submarine switches to fuel cells. The lower power output allows the submarine to be submerged in a low noise state.

When the submarine needs speed, switch to a closed diesel engine. Provide submarines with greater output power and higher speed.

In terms of enclosed diesel engines, the Zhengxin Poseidon series can be competent with a little modification.

At present, the first version of the fuel cell has also been successfully tested, and in terms of power generation effect, it can only be described as sour and cool.

The problem in front of Li Fanyu now is that in the first simulation test, the stability of the two gas storage parts has not yet met the requirements;

The principle of fuel cell technology is actually to reverse the electrolytic water splitting reaction. In this reaction, large amounts of hydrogen and oxygen are required.

In order to ensure sufficient range and maximum power output, two large liquid storage chambers were required. Oxygen is relatively less demanding in terms of storage technology. But hydrogen is not so easy to do.

As a consumable fuel, hydrogen can only be stored in liquid form within submarines. The storage conditions for liquid hydrogen are much harsher than those for oxygen!

Liquid hydrogen is known to be a mixture of secondary and positive hydrogen.

Secondary hydrogen and positive hydrogen have exactly the same chemical properties, but their physical properties are different. Specifically, the ground state energy of secondary hydrogen is much lower than that of positive hydrogen.

The equilibrium mixture of positive and secondary hydrogen at various temperatures is called equilibrium hydrogen.

The equilibrium concentrations of positive and secondary hydrogen are below 273 K and vary with temperature. The equilibrium mixture of positive and secondary hydrogen at temperatures above 273 K is called normal hydrogen and consists of 75% positive hydrogen and 25% secondary hydrogen.

When hydrogen is liquefied and stored, due to automatic catalysis, positive hydrogen will be converted into secondary hydrogen and heat will be released, resulting in evaporation loss of liquid hydrogen. Therefore, the secondary hydrogen content in liquid hydrogen products is required to be at least 95%.

In other words, when hydrogen is liquefied, it is necessary to catalyze the conversion of positive hydrogen into secondary hydrogen. Moreover, during the use process, the ratio of secondary hydrogen content in the storage tank should also be guaranteed at any time.

Although Zhengxin technology has accumulated hoisting, it is such a remote technology, and the technology is not very related to mechanical design, which still makes it difficult for Li Fanyu.

If it weren't for this, I'm afraid that the whole set of power equipment would have entered the installation test link now.

But even so, the R&D progress of Zhengxin still stopped the R&D personnel of the 920524!

It only took more than half a month to pull the R&D progress to such an extent, and Zhengxin's R&D strength has made many 920524 engineers already in a state of doubt.

Of course, it also includes Xing Yaxin.

In the R&D room of Zhengxin Power, which has been heavily protected by national security, Xing Yaxin came to Tiancheng again after half a month, and he couldn't believe his eyes.

In front of him, a complete set of pumping propulsion systems, fuel cell technology, and a large number of detailed and effective simulation tests and assembly test data are placed there.

"My good boy, Li Dong, do you know what you did?!"

"Oh my God, we have been coveting the pumping propulsion system for ten years! But in the process of repeated independent research and development, we have encountered technical difficulties that have not been overcome. You've done it now! You've done it!"

Seven years ago, we were inspired by the French API submarine power technology and tried to develop it, but after investing more than 10 million yuan in research and development, the final result ended in a miscarriage.

"And this motor!"

……

Seeing Xing Yaxin pointing to the R&D results as excitedly as the buns who had never seen the world, Li Fanyu was a little sad.

China's submarine research and development is, fundamentally speaking, embroidery on sacks - not that the work is bad, but that the foundation is too poor.

The accumulation of wars that have not experienced a major war, and the overall industrial level of the country cannot keep up with the speed of changes in weapons technology, these are the main reasons.

Li Fanyu patted Xing Datu's bun with a sour nose, "Come on, Director Xing." The results are rare for you, so I'll tell you about our current difficulties."

Li Fanyu truthfully informed the fuel cell storage technology defects, and Xing Yaxin's brows furrowed.

Just as he was about to say something, his phone rang.

Xing Yaxin looked at the display number on his phone, made an apologetic gesture to Li Fanyu, and trotted out.

After a long while, he walked back briskly with a calm face.

"What's wrong?" Li Fan asked when he saw that his expression was wrong.

"The Mengqi Naval Base is organizing a large-scale military exercise! The South China Sea Fleet has been ordered to be stationed in the waters of Apo Reef Island in the near future in case of emergency!"

"Huh?" Hearing the news, Li Fan was dumbfounded, "But the submarines of the South China Sea Fleet are currently capable of getting their hands on the three ......."

Xing Yaxin nodded, "So, we have to be fast! I didn't dare to think about it before, but now that I see your progress, I have confidence in you!"

"Hey," Li Fanyu patted his thigh, "but we can't beat the current liquid hydrogen storage technology!"

"You don't have to rush this, just do something else. Xing Yaxin smiled reluctantly, "I'll help you find a helper for this problem, and I will cure you with medicine!"

"Who?" asked Li Fan stupidly.

Xing Yaxin smiled mysteriously, didn't explain, and walked out of the door directly, took out his mobile phone and called the final assembly.

"Help me contact Jiuquan!"

!!:!!