Domestic car manufacturing is weak, what does it have to do with our land tanks?

The information behind it is terrifying when you think about it!

At this moment, car companies all over the world feel suffocated! They are all a little panicked!

No way…

Does Hongqi really have this strength?

They think from the bottom of their hearts that this is definitely impossible.

But now.

The shadow of being repeatedly beaten by Hongqi unconsciously floated up from the heart… I can’t help but tremble!!

Damn…

If Hongqi really succeeds, then wouldn’t it be invincible on this planet? ?

Then, these car manufacturing giants that have stood for a hundred years, will they still be able to survive? ? ?

They can’t accept it!

Even more unbearable!!

In fact, it means that Lu Yan doesn’t know the thoughts of these car manufacturing giants.

If he knew, he would definitely be speechless.

And complain:

A bunch of old guys, how old are they, and they still think they are the center of the world?

It seems that if Hongqi doesn’t build rockets and satellites now, there will be someone who can compete in the car manufacturing industry!!

Now. 25 is the export restriction.

In addition, there are multiple reasons such as tax laws of various countries and insufficient local accumulation.

Otherwise, for the level below 300,000 or 400,000, there is no need for Hongqi to make a move. BYD, Great Wall, Geely and other traditional car companies have long been eager to seize the big cake of the foreign market!!

……

Hongqi headquarters.

A row of officers cleared the way.

Gong Nanjiang and several main leaders of the rocket assembly department of the Space Administration came over.

There were not many people, and the scene was not big.

But looking at the military ranks on the shoulders of the accompanying officers, it was very dazzling.

Before meeting Lu Yan.

Gong Nanjiang really didn’t expect that the technical discussion of aerospace engines was actually written by the young man in front of him.

It was incredible.

He also looked at the industrial distribution map of Hongqi. It can be said that as long as it is related to automobiles, everything is done, and the key is to do it well!

Now Hongqi has firmly entered the list of national high-tech industries.

By next year.

It is said that the military will give several production plants under Hongqi the title of military-civilian integration units.

By then.

The core jobs in the Hongqi factory can all be established!

It can be seen that it is valued.

“Boss Lu, I won’t say any more nonsense.”

“I have read the technical discussion. To produce such a large thrust using a liquid hydrogen rocket engine, the thrust-to-weight ratio must be at least 170. With such a large thrust, how did you, Hongqi, solve the problem of the cryogenic insulation tank and ensure that each liquid hydrogen engine has a thrust of more than 500 tons?”

“China is also investing in the development and use of”liquid hydrogen engines”.

For example, the”Long March 5″ uses liquid hydrogen and liquid oxygen injection into the internal core stage and booster through a turbine high-pressure pump to inject the regenerative cycle thrust chamber. In order to make up for the lack of explosive thrust, it also uses body material action as a supplementary solution. (To read explosive novels, go to Faloo Novel Network!)

Of course.

The two biggest problems are still how to isolate the thermal conductivity, convection and thermal radiation temperature transfer inside the insulation material under the large temperature difference of 270K, and how to burst out super strong propulsion.

Describe it in simple words.

One is the problem of”insulation” and the other is the problem of”total power output”.

Insulation of tens of degrees or hundreds of degrees can be done by conventional technical materials, but when the atmospheric pressure changes and the internal pressure rises, it is necessary to insulate thousands of degrees. The test proposed can approach the limit of human current development technology and materials.[]

In addition, the natural energy density of liquid hydrogen and liquid oxygen is not as good as that of liquid oxygen and kerosene engines.

The Saturn V that the United States used to land on the moon weighed more than 3,000 tons, and each stage of the rocket had 5″F-1 liquid oxygen-kerosene engine” in parallel, the thrust of a single engine reaches 680 tons.

If it is replaced with a”liquid hydrogen and liquid oxygen engine”, the thrust value will at least be cut in half, and the engine size will need to be increased.

But now.

Hongqi is trying to achieve a single thrust of 500 tons, which is an extremely exaggerated value

“Our thrust is high, mainly because the whole engine adopts a three-tube thrust chamber design, and the internal boost combustion chamber pressure can reach 27 MPa……”

“The liquid hydrogen cryogenic insulated tank adopts a three-layer vacuum chamber sleeve structure design.

Each layer of the vacuum chamber can independently adjust and control the atmosphere and air pressure.

The tank and shell section are made of internal aviation special aluminum alloy material.

In addition, the yield strength of this material will be further increased after low-temperature strain.

In the liquid oxygen temperature range (-183), the tensile strength can reach 2792.

66MPa and the specific strength can reach 296……”

Lu Yan was not vague.

Facing the question from Mr. Gong, the aerospace boss in front of him, he directly brought out the system parameters.

Cryogenic environment treatment can change the microstructure of materials, thereby increasing the yield strength of materials, which was discovered by the aerospace science community decades ago.

That’s why Musk, this old guy, can use 304 stainless steel with a room temperature tensile strength to density ratio of 66 to make rocket tanks.

In the liquid oxygen temperature range, the yield performance ratio of stainless steel can soar to 189, which is much more cost-effective than other materials.

However, specific strength is not the only indicator of tank design.

During flight, the force structure of the rocket tank is quite complex. It must withstand the axial pressure of the satellite and the upper section of the rocket, as well as the internal pressure of the pressurized gas in the tank.

Rocket tanks using liquid hydrogen and liquid oxygen as propellants are even more complicated because of the added difficulty of low-temperature insulation.

But now,

Hongqi can solve all of them.

It is equivalent to the other 140 companies still playing with two-stroke engines, while Hongqi has already started to work on direct injection and turbocharging, far ahead of the others!!

Gong Nanjiang listened attentively!

Although he did not see the core structural parameters, the information from Lu Yan’s brief description was much more than the previous technical discussion, which fully pointed out the feasibility of further development of liquid hydrogen rocket engines. The other aerospace experts present were even more shocked!

Three-tube thrust chamber design structure!!

Good guy.

No wonder the explosive thrust ratio is so large.

You Hongqi are really daring!!

Who on earth came up with this? ? Their Sixth Academy of Aerospace Research and Development, the most powerful high-pressure regenerative liquid oxygen-kerosene rocket engine at present, model”YF135″, is also a double-tube thrust chamber design. Although the single-chamber thrust in the regenerative engine has reached the world’s largest, the internal high pressure and high temperature have already considered the material limit and it is difficult to make progress.

Several models in the laboratory, such as the”YF215″, are considered a replica of the Raptor rocket engine, using a full-flow staged combustion cycle of liquid oxygen and methane, and are still in the semi-test stage.

Many aerospace people are a little nervous!!

If they can really overcome it… then the domestically produced high-thrust hydrogen-oxygen rocket will be a success!!

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I’m a sabmado