Automotive Black Technology Chapter 1170: : Give the submarine a good heart!

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According to Li Fanyu's plan, the large diesel engines, circulation and transmission gearboxes, and tail propulsion devices on the two conventionally powered submarines are all to be removed!

On the two Kilo-class conventionally powered submarines of the South China Sea Fleet, the CCDAIP system is used, which is the legendary closed cycle diesel engine system.

This system uses a closed-cycle diesel engine code-named HJack as the prime mover of the generator. In order for the diesel engine to work without air supply, air must be simulated in a limited space so that the diesel engine can burn normally. .

In order to solve this problem, in this set of CCDAIP, Maozi absorbs and filters the exhaust gas from the diesel engine through a CO2 absorber, and adds an appropriate amount of oxygen to the unabsorbed part of the exhaust gas to form an artificial atmosphere.

However, since the CO2 content in this artificial atmosphere is always more than that of fresh air, the specific heat value of the artificial air is lower than that of normal air. In order to ensure that the diesel engine operates normally in a closed cycle state, the hair is in the recirculated gas. The monatomic gas argon is added to make the specific heat ratio of the mixed artificial atmosphere consistent with that of normal air.

In this way, the diesel engine can work normally in a closed cycle state or with an open air supply to realize opening and closing.

Maozi's R&D thinking is very strange. Generally speaking, he can't change anything. There was once a joke about a bear fighter plane whose engine stalled at high altitude. According to the practices of Japanese, American, and German fighter jets, they will definitely need major changes.

But what Maozi did was to hang two bottles directly on the plane, put oxygen in one and hydrogen in the other, and then mix them together. When the fighter plane stalls, put these two bottles of gas into the engine and ignite it...

It is so simple and crude and does not pursue perfection.

So, how does this CCDAIP work?

In order to efficiently absorb CO2 in the diesel engine exhaust gas, a cooling system is first used to spray and cool the exhaust gas with a temperature of 350 to 400°C and a pressure of 0.2 to 0.5Mpa to 80 to 100°C. The cooled exhaust gas is then sent to the CO2 seawater absorber to allow the seawater to fully dissolve and absorb the CO2 gas.

The "washed" exhaust gas enters the mixing chamber and is mixed with oxygen and argon before being recycled. The seawater containing a large amount of CO2 is then discharged overboard through the seawater treatment system.

In order to make the entire AIP system work in a coordinated manner, a computer control system is set up to control the seawater flow, oxygen supply, etc. of the water treatment system, so that the entire system can adapt to changes in diesel engine load and submarine diving depth to ensure normal operation.

In order to ensure the supply of oxygen, Maozi also set up a larger-capacity liquid oxygen tank just like the fighter plane joke. Please note that the storage temperature of this liquid oxygen must be around minus 180°C, so there must be constant cooling. system.

In addition to the oxygen tank, there must also be several argon gas bottles of smaller capacity...

Complicated enough, right?

This is just a power system, not counting the transmission gearbox.

When so many complex equipment are working at the same time, the noise emitted is definitely disaster level - in Li Fanyu's opinion.

So Li Fanyu simply waved his pen and said, “I don’t want all of this!”

Although Zhengxin’s battery technology already has two black technologies: super molten metal batteries and centrifugal air batteries, Zhengxin R&D Center has never given up on exploring better car battery technologies.

For such a long time, Zhengxin has achieved several research and development results. However, because the two battery technologies given by Li Fanyu are not mature in terms of performance or other conditions, they have not been applied to Zhengxin's models.

One of the results is the fuel cell.

The basic working principle of this kind of battery is to work by directly generating electrical energy through the reaction of hydrogen and oxygen. This process is exactly the opposite of the process of decomposing water through electrolysis. The only by-product of generating electrical energy is water.

However, this kind of fuel cell must continuously supply hydrogen and oxygen, so if you want to maintain the operation of the entire device, you must not only have a larger-capacity liquid oxygen tank, but also a larger-capacity liquid hydrogen storage tank.

This is definitely a useless technology for a car with every inch of space and every inch of gold.

But now, if you put it on a submarine, you don’t have so many worries!

If Zhengxin's power generation technology can be expanded in power, then only one reaction device and two large storage tanks will be needed to ensure sufficient electrical energy for the propulsion of the submarine. Not to mention the simple structure, what’s even better is that the process of generating electricity… there is almost no noise!

Replacing the diesel engine with this power generation device requires only a cable to replace the complex and noisy transmission gearbox.

By connecting the cable to a motor with an integrated voltage regulator, it can be used directly as driving power.

This power system, in Li Fanyu's opinion, can at least reduce the noise source of the submarine by half.

But because they don’t know what the screening range of other countries’ undersea sonar detection systems is, Xing Yaxin and 920524’s request to Li Fanyu is to do everything they can to reduce the noise of the submarine.

With this goal in mind, Li Fanyu extended his claws to the submarine's propulsion system.

In fact, the Kilo-class originally had a very low-noise propulsion system. That is the famous Momupua pump-jet thruster.

This submarine pumpjet propeller is a combined propulsion device composed of an annular duct, a stator and a rotor.

The cross-section of the annular duct is an airfoil shape, covering the rotor and stator, and the control surface of the internal and external flow fields of the pump jet propeller. The stator is a set of fixed blades at a certain angle with the incoming flow, which causes the rotor flow to pre-spin or absorb the rotational energy of the rotor wake; the rotor is a rotating impeller similar to a propeller, which generates thrust through interaction with the water flow to propel the submarine. reach the required speed.

The operating noise of this set of pump-jet propellers is said to be as quiet as "a gentle breeze blowing through the curtains."

However, the weapons and equipment exported by Maozi to China are usually castrated and castrated versions. It’s not that I’m being picky, it’s actually that China has an incredible talent for “learning” in the field of weapons and equipment. What’s even more annoying is that after “learning” this technology, you can often rely on this technology to make better finished products, and then... sell them to other countries to compete with the master for business.

So the two Kilo-class submarines of the South China Sea Fleet are equipped with two sets of seven-blade large inclined propellers for propulsion.

Traditional submarine propulsion mainly uses a single seven-blade large inclined propeller. In this way, due to the excessive load on the propeller, cavitation will occur in the propeller blades in advance, which will reduce the low-noise speed of the nuclear submarine: If in order to delay the generation of cavitation, the propeller blade area must be increased, which will lead to a decrease in propeller efficiency and noise. increase.

Although the "double seven-blade" is also good, it is really incomparable to the pump-jet propulsion method.

But what a coincidence, Li Fanyu only knew the principle of the pump spray system and knew what this game was about.

Knowing what is going on is enough for Li Fanyu!