Since the end of campus recruitment, the Rocket Research Institute has been replenished with a large number of young technicians.

The technical progress of each project team has obviously been promoted at a rapid pace.

The first to complete the design and production process is the core combustion chamber of the rocket.

The combustion chamber is the core of the rocket engine as a component that produces high-pressure propulsion gas from the combustion of rocket fuel.

It is equivalent to the human heart, and without a qualified and reliable combustion chamber, it is equivalent to a person with congenital heart disease.

There is no way to carry out high-intensity exercise, and there is no way to launch all kinds of heavy satellites into space.

The rocket engine design scheme given by Zhang Xingyang is very complete.

However, the development of rocket engines is not all right with drawings.

A series of tests were also required to ensure that the entire engine was not a single design problem.

This is also a requirement of the technical zeroing criterion in the double zeroing system.

Therefore, at present, Zhang Xingyang is most concerned about the test of the combustion chamber structure of the new model of rocket engine.

Because of the new carbon-carbon composite materials developed before, the problem of mass production has not been actually solved.

Therefore, in the first structural test, the research institute used the high-strength structural steel that had always been used in the previous rocket engine.

Of course, this is also a method that Zhang Xingyang later conceived to reduce performance and reduce costs.

After all, after learning about the processing level of carbon-carbon composite materials in this era, he has a more accurate understanding of the cost assessment of new materials.

For the processing plant, because there is no special change in the material, only the processing technology needs to be adjusted to complete the combustion chamber manufacturing.

So after the design drawings were completed, they were sent to the processing plant that has been cooperating with the Rocket Research Institute in less than a week.

The new rocket engine combustion chamber completes a series of machining processes, from rough blank to finish milling.

The rocket engine combustion chamber test uses the water pressure test to simulate the high-pressure state of the rocket during operation.

Because ordinary high-thrust rocket engines will generate high pressures of more than 100 atmospheres during operation.

The new rocket engine designed by Zhang Xingyang will generate more powerful pressure during operation, and it is estimated that it will exceed 180 atmospheres according to the data.

The internal pressure test of the combustion chamber shell includes three tests, namely the hydraulic test, the hydraulic burst test, and the positive pressure air tightness test.

The first test is the airtightness test to prevent leakage due to a leak in the combustion chamber housing.

After assembling the combustion chamber housing, connect the housing and the pressure reducing valve with an inflatable pipe, and check whether each connection is secure and normal.

Then turn on the air source and increase the pressure in the combustion chamber to the specified 20Mpa.

Observe the pressure gauge for pressure reduction issues.

As a veteran manufacturer that has been processing for the Rocket Research Institute, the processing technology is still good, at least there is no big leakage problem.

Then, use a neutral soap to check the airtightness of each airtight interface for leakage.

When the packing pressure starts, the pressure of the combustion chamber housing is recorded.

After staying for a few hours, Zhang Xingyang looked at the test record sheet in Qiao Yang's hand on the side.

The data recorded above shows that even the newly machined shell has excellent air tightness, and there is no air leakage.

This was followed by a hydrostatic test of the combustion chamber housing.

The preliminary preparation is still similar, except that the high-pressure gas is replaced with clean water, and the preservative liquid needs to be added to it.

In order to prevent the water from corroding the shell of the combustion chamber during the experiment.

After activating the high-pressure water pump, the water pressure in the combustion chamber housing is increased to 5 atmospheres.

During this process, the experimenter is not allowed to stay in or leave the test room.

Everything can only be recorded by means of a computer-displayed value.

This is also for the safety of the test personnel.

If there is a slight problem with the manufacture of the casing of the combustion chamber, then an explosion during the test is likely to endanger the safety of the test personnel.

These are the strict standards that our predecessors tested with their blood and lives.

The hydrostatic test is carried out faster than the tightness test, after the test has been completed.

The water in the combustion chamber casing is lowered first, after the water flow has been reduced to atmospheric pressure.

Zhang Xingyang took a look at Qiao Yang and the others who rushed into the laboratory and took pictures of the state of the entire system.

Then I turned my attention to the test readings, just like the previous tests.

The hydrostatic test data is also very good.

Zhang Xingyang looked at Qiao Yang, who was methodically preparing for the next hydroblasting experiment, and thought to himself.

Then comes the blast test, which is the most important thing for performance.

This experiment is also destructive, requiring the water pressure to be strengthened to the point of directly destroying the combustion chamber housing.

After drying the metal shell and wiping off the oil and water stains on it, Qiao Yang reconnected the high-pressure water source to the shell.

Exiting the laboratory, Zhang Xingyang looked at all the personnel who had already left the laboratory.

Only then did the button that began pressurizing the housing be pressurized.

The pressure readings on the computer monitor are getting higher and higher, but at 12Mpa, the housing is still unchanged, which is already equivalent to 120 atmospheres.

Next, the pressure inside the shell rose to 18Mpa without any deformation.

When the water pressure rises to 20Mpa, the first screw breaks from the first thread.

When the pressure is continued to be boosted to 20.5Mpa, all the screws are broken, the rear head of the combustion chamber shell falls off, and the connection fails.

The high-intensity water pressure in the shell gushed out in an instant, like a dragon king squirting water.

Zhang Xingyang touched his chin with short beard stubble, thinking about the results of this experiment.

In fact, according to the requirements of the experimental design, the combustion chamber shell still fulfilled its mission.

After all, his design requires that the burst pressure only needs to be greater than 19.4Mpa.

But judging from the test just now, there are still problems that I haven't paid attention to.

It's the screw that broke in the test!

The country in this era is not only in a backward state in various high-tech aspects.

These have laid the foundation of various heavy industries, and the connectors that can be called the industrial foundation are also in a mixed state.

When all the hustle and bustle in the laboratory calmed down, Zhang Xingyang also walked into the laboratory full of water.

I stroked the small half-cut screw that was broken on the shell, and the surface was very flat.

Zhang Xingyang carefully observed the broken stubble again, and the screws that were still on the shell in the small section did not undergo visible deformation.

This proves that the fracture of the screw is not a ductile fracture, but a brittle deformation caused by stress concentration.

Of course, these are only Zhang Xingyang's naked eye judgments, and the detailed accident analysis also requires stress analysis and metallographic analysis of the port.

However, the test still achieved the desired results, and there was no complete failure.

So much so that Zhang Xingyang was still in the mood to make a little joke with Qiao Yang, who was busy cleaning up the laboratory:

"Qiao Yang, please leave the stress analysis to you, after all, you are the one who wants to become a mechanics boss!"