Courtyard light

Chapter 766 Preliminary Test Completed
As the data feedback came in and the tests passed one by one, Liu Hai breathed a sigh of relief.

Although Sun Aiguo didn't understand what each test meant, he watched Liu Hai continuously writing down the data on the notebook. Each test had a correct range of values. If the test results were between these correct values, then there would be no problem.

The reason why this value is a range is because the working conditions of the engine itself are different. When in the afterburner state, the data of each part is higher, such as temperature, oil pipe pressure, etc.

"Director, the preliminary testing of the engine has been completed. How long do you think it will take before it can be put on the test bench?" This is also a necessary process.

"Go ahead, get going right away, everything is ready over there." Sun Aiguo was just waiting for these words.

Then Sun Aiguo, Liu Hai and the deputy factory director in charge of military industry signed.

After the engine is tested on site, it will be sent to a professional test bench for testing.

This test bench is not inside the motorcycle factory, but in a ravine.

The next day, Liu Hai, Sun Aiguo and others went to this place together.

The engine is packed at the factory and then loaded into a box truck and transported to the test bench.

Although they look like just a few vans, the security is still very strict.

We arrived safely at the mountainous area where the test bench was located. After removing the engine, we checked it again before starting to move onto the test bench.

Anyway, this is the engine testing process.

After connecting various pipelines and starting the equipment, this time it was not Liu Hai who was in charge, but a professional.

The engine started to ignite, and Liu Hai, Sun Aiguo and others looked at the engine on the test bench in the valley from afar.

Although in theory all safety precautions have been taken during the test drive, Liu Hai and Sun Aiguo should stay away from them because no one knows what might happen.

In fact, this kind of fighter engine test is not very dangerous. What is dangerous is the liquid fuel rocket thruster, and the dangerous thing about that thing is also the fuel.

If there is a leak or other accident, it will be troublesome.

When Liu Hai saw the red flame coming out of the tail of the engine, he knew it was stable. No matter what, as long as the ignition was successful, he could continue to optimize it even if there were problems later.

After a month of continuous testing, we finally got preliminary data on this engine.

"Very good, very good!" On the day when the test data came out, the leader of the department in charge of the fighter jets came to the scene in person. Looking at the data appearing on a thin piece of paper, he was so happy that he almost laughed out loud.

The data are as follows: single-unit thrust 8.0 tons, afterburner thrust 13.1 tons.

The overall weight of a single unit is 1.6 tons.

The fan is a three-stage axial flow type, and the rotor blades are made of titanium alloy.

The compressor is a 9-stage axial flow type, with the first 3 stages made of titanium alloy and the last 6 stages made of special steel.

The fuel in the combustion chamber is sprayed and atomized through multiple double-cone nozzles and multiple small vortex cups to achieve smokeless combustion with a uniform outlet temperature field. The material is high-temperature resistant nickel-based alloy.

The high-pressure turbine is single-stage axial flow, with high-load air-cooled blades, using impact and air film cooling, and the blades are cast using a single crystal casting method.

Alloy crystallization is one of the most important technologies in aircraft engines.

This engine is designed by Liu Hai based on the Su-27's own engine and absorbs part of the F135 engine on the aircraft carrier.

还有F/A18C使用的F404-GE-402EPE发动机，推力为7.9吨，历史上这个发动机是在1991年换装的。

Of course, the f135 engine is a fully digital system, so it is impossible to copy many things now.

The F135 engine is an extension of the F22 engine used in the F119, and its afterburner thrust exceeds 18 tons.

However, it is impossible to copy the F135 engine now, and the full electronic control system is not suitable at present.

Moreover, the performance of the current engine can be further improved if full electronic system control is used.

"Engineer Liu, well done!" The department leader took the lead in applauding the department. Before coming, the leader had already memorized the relevant domestic technical information by heart.

The thrust of the aircraft engines currently used in our country is less than 6 tons.

What does the thrust of an aircraft engine represent? It represents combat effectiveness. It means being able to carry more fuel, expand the combat radius, and carry more weapons and equipment, making the fighter more powerful.

Carrying more powerful radars allows aircraft to see farther and hit further.

"Thank you for the praise, leader. This is what I should do." Liu Hai appeared humble on the surface, but he was actually very happy in his heart because he had passed this major test.

Although the various parameter indicators of this engine are still far behind those of the fifth-generation aircraft engines of various countries in 2020, a lot of effort has been put into this engine, and it can be said that there are many technical integrations.

After all, the engine technology I learned at the beginning and the engine technology on aircraft carriers belong to two different directions. Of course, our Taihang engine later also absorbed the strengths of various companies.

However, Liu Hai was also very tired during this period. Whenever he had time to enter the aircraft carrier space, he would stay there for a long time. Thanks to the various design software in the aircraft carrier space, there are special aviation engine software on the aircraft carrier, which is mainly to help engineers quickly understand the current status of the aircraft engine, service life, etc.

Of course, there are also a lot of information in the hands of engineers that is very helpful.

In fact, the most important thing is the information in the hands of engineers. Because if engineers want to complete the aircraft maintenance and diagnosis tasks, they must have enough information to make judgments and have enough methods to perform repairs and maintenance quickly.

These engineers' notes are the most important because many tips are not included in the formal process.

Why did Bald Eagle say later that he could not land on the moon again? On the one hand, it was said that his information was lost, but more sayings were that the workers' notes were lost.

In fact, in 2020, the same is true for Fat Goose in many weapons and equipment. There is enough information, but there is no one to turn this information into complete parts or equipment.

Because the old generation of workers in the two countries has grown old, and the new workers have no idea what the old workers did.

To put it bluntly, like some of the ancient crafts in our country, even if you get the complete records of these crafts, you cannot restore them.

It took Fat Goose many years to fully understand the control system of their Tu-160 bomber, let alone convert the control system to a fly-by-wire system.

Of course, Fei Xiong also has a shortcoming. Before the separation, his technical system, whether manufactured or designed, was not completed in one place.

For example, the parts of an aircraft engine may be a collection of parts produced by hundreds of factories in its member countries.

Therefore, it is more difficult to recover.

Of course, another reason is that we don’t have money. If we had money and kept trying and making mistakes, we might be able to figure it out in a few years.

As for the situation of the bald eagle, it is hard to say whether his data is falsified or the data is really lost.

There was a long-lasting applause in the conference room. Those who were able to attend this meeting certainly knew what this fighter engine meant to us.

As for the cost, we don't talk about it at all, because in the face of national defense, no matter how big the investment is, it has to be made. Of course, the cost of this aircraft engine is not cheap, and a large number of various high-temperature resistant alloy materials are used.

The raw materials for these alloy materials have limited reserves and their content in ores is also low. In order to obtain sufficient raw materials, more ores must be mined and then refined.

It can be said that the prices of many rare metals exceed those of gold, such as metal Lai, which is one of the indispensable materials for the crystallization of aviation engines and one of the materials needed for nickel-based alloys in combustion chambers. However, the reserves of this thing are limited, and it can be said that it is more difficult to find gold than panning for gold in sand.

Liu Hai also calmly accepted everyone's applause. After all, he really put in a lot of effort this time.

"How long will it take for this engine to go into mass production?" the main leader asked impatiently after the applause died down.

"Half a month ago, we started making engines to test our newly designed fighter jets," said Sun Aiguo.

Sun Aiguo's rank was high enough for him to make the decision on private production. According to the process, production could not take place before the engine testing was completed, because no one knew whether the engine was qualified or not.

Oriental Heavy Industries is a high enough corporate level enterprise and Sun Aiguo has sufficient qualifications, so there is no problem in making the decision. Even if there are problems with subsequent engines, the scrapping of the previously produced engines will not have much impact on Sun Aiguo.

If it were anyone else, they would definitely not have the courage to do this, because the materials used in this engine are very expensive, not to mention the electricity, manpower, material resources, etc. consumed in its production.

"Good." The department leader said something good about Sun Aiguo's behavior.

"What about fighter jets?" the department head asked again.

"Basically we're just waiting for the engine. The fuselage has been built, and we'll start ground testing once the engine is installed." Sun Aiguo said with a grin.

To be precise, the fuselage has been manufactured, and we are just waiting for the engine, but the main problem is that the engine is too difficult to manufacture.

"Ground testing is expected to begin in January next year at the latest." Sun Aiguo gave an approximate time.

It is because the engine manufacturing is a hindrance. Of course, strictly speaking, this is already a fighter jet being rebuilt at the speed of light.

"If everything goes well, we will be able to start finalizing it in the second half of next year, mainly the fly-by-wire system, which we will use for the first time." Sun Aiguo didn't know why the fly-by-wire system was so troublesome, but if Liu Hai said it was troublesome, then it was troublesome.

"We look forward to hearing good news from you."

"Let's go and see what the plane is like!" The department head couldn't sit still any longer.

"Hey, the arched back of this plane looks a bit like a shark?"

A key person involved in the aircraft design explained, "Boss, this aircraft adopts a lifting body design with a wing-body fusion, with a smooth transition to form a lifting fuselage. The front fuselage is slightly larger to accommodate larger and heavier avionics equipment, and the result of the optimized aerodynamic design is that it has less drag and better flight performance."

"This is mainly because my country still has some gaps with foreign countries in terms of fighter jet radar."

my country has begun to catch up with or even lead the world in large radars and ship radars, but the miniaturization of radars is still very slow.

Just like the anti-artillery radar that Liu Hai took out, that thing was huge and was made entirely of materials.

The radar on a ship can also be made larger, because adding one or two tons to a ship is not a big deal, but this is not the case with a fighter radar, as a few hundred kilograms more will make a difference.

“This will allow our aircraft to see farther and hit farther.”

The department leader looked at Liu Hai standing next to him, and then said approvingly: "The designer must take into account our overall equipment level."

"Theoretically, the aircraft's combat radius can reach 1600 kilometers."

"In addition, it has 10 hanging points and can carry more than 8 tons of weapons and equipment."

The department head nodded when he heard this.

"I wonder if Fatty Bear has got the Su-27? I don't want the two families to collide with each other. However, my engine level is much higher than theirs." Liu Hai only heard the technician's introduction in his ears, but did not listen to it. Because he dealt with them every day, there was no need to listen carefully.

Of course, with this aircraft, it will be easier to develop carrier-based aircraft in the future.

"But developing carrier-based aircraft is also a headache. They must have a catapult and a ski-jump for takeoff, and there is no way to use the aircraft's maximum load." However, what makes Liu Hai headache is that developing carrier-based aircraft also faces problems.

If a carrier-based aircraft wants to take off with full fuel and ammunition, it must use a catapult.

Thinking about his teaching building No. 001, Liu Hai also had a headache because there were too many systems inside.

The main thing is that I can't just throw out all the drawings at once, and before taking out the drawings, I also have to take out the related technologies.

In other words, why is it designed like this and what is the design idea?
Of course, in the eyes of some people, these systems of the 001 teaching building developed by Liu Hai have not been verified and there is no way to verify them now.

After the department leader finished the tour, he gathered all the people involved in the project and gave a brief speech.

"Invite the main leaders when we do the ground testing of the aircraft!" After the department leader left, Sun Aiguo said to Liu Hai.

"Leader, please take care of the arrangements." Liu Hai nodded.

"I hope our fighter jet can be successful." Sun Aiguo let out a long sigh.

"It will be no problem." Liu Hai was not panicked. If nothing works, he can just copy f18.

If the Bald Eagle can use this as a carrier-based aircraft, why can't I use it myself?
Since he has something to fall back on, Liu Hai is not panicked at all. If he fails, he can just try again.

Sun Aiguo certainly didn't know that there was a backup plan for his bangs.

"Now that you have one less job to do, spend more time with your family."

"The other two projects are also very daunting." Not to mention Teaching Building 001, the most difficult part of the liquid-fuel rocket engine is the control system.

Although it sounds simple, there are too many things to do, such as sensor accuracy, sensor position, control unit accuracy and so on.

One disadvantage is that it is easy to squat when taking off and landing.

Liquid rockets are very dangerous if they are not fired properly, and if you are not careful, it will cause a huge ball of fireworks.

"You! You can go back early today."

"I'll go back early, too. I'll call my husband and ask him to get some good wine and food."

"Director, how about I give you some good wine?"

"I drink less now, only when I'm happy. Drink less, live a few more years, and see more of the development of our factory."

"Okay!" Liu Hai nodded.

(End of this chapter)