A big country of aerospace with black technology

Since the end of campus recruitment, Rocket Academy has added a large number of young technicians.

The technical progress of each project team has obviously advanced rapidly.

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

The combustion chamber, as a part of the combustion of rocket fuel to generate high-pressure propellant gas, is also the core of the rocket engine.

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

There is no way to perform high-intensity exercise, and there is no way to launch various heavy-weight satellites into space.

The rocket engine design plan given by Zhang Xingyang has perfect data.

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

A series of tests are also required to ensure that the entire engine has no design problems.

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

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

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

Therefore, for the first structural test, the research institute used the high-strength structural steel that has always been used in rocket engines.

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

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

For the processing plant, because there is no special change in the material, it only needs to adjust the processing technology to complete the manufacture of the combustion chamber.

So after the design drawing was completed, it took less than a week to send it to the processing factory that has been cooperating with the Rocket Research Institute.

The new rocket engine combustion chamber has completed a series of processing processes from rough blank to fine milling.

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

Because ordinary high-thrust rocket engines will generate high pressures exceeding 100 atmospheres during operation.

The new rocket engine designed by Zhang Xingyang produces stronger pressure during operation, and according to data calculations, it will exceed 180 atmospheres.

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

The first thing to do is the air tightness test, in order to prevent the combustion chamber shell from leaking and leaking.

After the combustion chamber shell is assembled, connect the shell and the pressure reducing valve with an air-filling pipe, and check whether each connection part is firm and normal.

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

Observe whether the pressure gauge has the problem of depressurization.

As an established manufacturer that has been processing for the Rocket Research Institute, the processing plant has good processing technology, at least there is no big leakage problem.

Then use a neutral soap solution to check each airtight interface for leaks.

Record the pressure in the combustor casing when the pressure hold begins.

After staying for several hours, Zhang Xingyang looked at the test record form in Qiao Yang's hand.

The data recorded above shows that even the newly processed casing is very airtight, and there is no place for air leakage.

The next thing to do is the hydraulic test of the combustion chamber casing.

The preparatory work is similar, except that the high-pressure gas is replaced with clean water, and anti-corrosion liquid needs to be added.

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

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

During this process, the experimenters are not allowed to stay and enter the test room.

Everything can only be recorded through the numerical values ​​displayed by the computer.

This is also to consider the safety of the test personnel.

If there is a little problem in the manufacture of the shell of the combustion chamber, an explosion will occur during the test, which may endanger the safety of the test personnel.

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

The hydrostatic test is performed more quickly than the leak test, after the test has been completed.

First reduce the water body in the combustion chamber housing, after the water flow is reduced to normal pressure.

Zhang Xingyang looked at Qiao Yang and others who rushed into the laboratory to take pictures of the status of the entire system.

Then he turned his attention to the test reading, which was the same as the previous test.

The data of the hydrostatic test is also very good.

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

The next step is the blasting test, which is the most important performance.

This experiment is also a destructive test, which requires the water pressure to be increased to the extent that it directly destroys the combustion chamber casing.

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.

After exiting the laboratory, Zhang Xingyang checked that all the personnel had left the laboratory.

Only then is the button to start pressurizing the housing pressed.

The pressure reading on the computer display is getting higher and higher, but when it reaches 12Mpa, the shell still has no change, which is equivalent to the strength of 120 atmospheres.

Next, the pressure inside the shell has been raised to 18Mpa without any deformation.

When the water pressure rose to 20Mpa, the first screw broke from the first buckle thread.

When the pressure continued to increase to 20.5Mpa, all the screws broke, the rear head of the combustion chamber shell fell off, and the connection failed.

The high-intensity water pressure in the shell gushes out instantly, like a dragon king spraying water.

Zhang Xingyang stroked his short bearded chin, thinking about the results of this experiment.

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

After all, his design requires the blasting pressure to be greater than 19.4Mpa.

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

It was the screw that broke during the test!

The country in this era is not only lagging behind in various high-tech.

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

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

I stroked the small half of the screw that was broken on the shell, and the surface was very smooth.

Zhang Xingyang carefully observed the broken stubble again. The small half of the screw that was still on the shell did not undergo any deformation visible to the naked eye.

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 just Zhang Xingyang's naked eye judgments. A detailed accident analysis also requires stress analysis and metallographic analysis of the port.

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

As a result, Zhang Xingyang was still in the mood and Qiao Yang, who was busy cleaning up the laboratory, made a little joke:

"Qiao Yang, I'll leave the stress analysis to you. After all, you are going to be a master of mechanics!"