Chapter 642 Turbofan 10, installed!

In order to prevent Chang Haonan from being distracted at the most critical stage of the project, Ding Gaoheng did not immediately notify him of David Guo's mischief on the early warning aircraft project.

So the former didn't know yet that he had been "booked" in advance.

Of course, in fact, he himself has already had the idea to develop an early warning aircraft on the C909 passenger aircraft platform.

I didn't have the conditions before, and I really didn't have the skills to do anything at the same time.

According to the current progress, the design of Turbofan 10 should be finalized by the end of next year or the beginning of the next year.

As for the heavy-duty die forging press, it can currently keep up with the National Day gift schedule, and it will not be a problem to start trial production in the middle of next year.

After the equipment problem is solved, Hufei can start producing C909.

In the beginning, it will definitely be assembled from parts, but in any case, with the technical data, especially the technical data related to the body structure, the prerequisites for modification as a special aircraft platform will be established.

By that time, the prerequisites for developing large-scale early warning aircraft will be basically mature.

Therefore, the two people's ideas actually coincide with each other.

However, Chang Haonan's attention is still entirely focused on the turbofan 10 project in front of him.

As an engine developed from scratch starting from the core machine, the workload of bench testing is indeed very large.

In order to improve test efficiency, Institute 624 even temporarily modified the SB102 test bench originally used to test turboshaft/turboprop engines. Liming Factory also temporarily arranged the production of a second B0102 prototype to participate in the test at the same time.

Despite this, it still took almost three months for the bench test to complete the core projects before the installation and flight test, when most of the subjects were passed in one go.

Jiang Fuhe took the test results that had just been printed out and found Chang Haonan who was in the control room to sign:

"The results of the proportional life test show that Turbofan 10 has a confidence level of more than 98% and can meet the design specification requirement of an overhaul interval of more than 1500 flight hours."

"According to our standards, at this point, the engine can begin installation experiments."

The latter had already seen the results before the report was printed, so there was no need to waste any more time at this time. After a little confirmation, he signed his name at the end:

"So my work here is basically over, and other subsequent projects will be handed over to Mr. Hai."

He said and looked at Hai Yide, who was wearing a cotton-padded jacket, but his defense was still broken by the cold and humid weather in the south.

"Don't worry, I promise to hand over the subsequent test data to you with high quality and quantity."

The latter's voice was still a little trembling when he spoke, but he could still be heard with confidence.

Chang Haonan just gave a routine instruction, but he was not really worried.

After all, although Hai Yide's past resume is average (compared to Chang Haonan's), he is still a senior who has participated in the development of several models, and his basic skills are fine.

The following test items, mainly the full cycle life test that can only be started after the B0103 is shipped, are more time-consuming and energy-consuming. The rest just need to be done step by step and according to the standards.

The so-called full cycle life test is to actually use an engine until it is scrapped.

The corresponding one is the proportional life test that Jiang Fuhe mentioned just now and was just completed.

The latter is to allow the engine to perform specific cycle conditions, thereby shortening the test time according to a specific ratio.

For example, if Chang Haonan chooses a time ratio of 1:3, it only takes 500 hours to simulate the 1500 hours of testing under normal circumstances.

Of course, since it is a simulation, it cannot be 100% restored. So there is a question of confidence.

This is mainly to shorten part of the process and allow the installation test to start early.

That is what Chang Haonan is about to deal with.

……

Now that Chang Haonan wants to fly back to Shengjing, he naturally does not need to fly to Taoxian Airport first, as most people did before, but directly lands at Beiling Airport.

This is especially true when I was going to Factory 112 this time.

"Mr. Chang."

When I got off the plane, I saw He Ming, wearing work clothes, leading a few people to the tarmac to greet him.

"Junior brother, long time no see."

Walking behind was senior sister Yao Mengna, who had not seen Chang Haonan for almost a year.

The latter has been responsible for optimizing the final assembly efficiency of Project 11 during this period, as well as dealing with the weight reduction issue of the improved new airframe.

After these two years of experience, she has become a bit like the stereotype of a female doctor.

Looking at the high-spirited Chang Haonan who had just stepped down from the gangway of the business jet, Yao Mengna suddenly had the urge to go up and give him a hug.

However, she also knew that the current occasion and time were not right, so she quickly suppressed that feeling in her heart.

"Mr. Chang, the No. 1010 verification machine has basically completed its final assembly and is now parked in the workshop. Do you want to go and take a look?"

He Ming felt that the atmosphere seemed a bit strange. Although he couldn't explain it, he keenly changed the topic to work.

"So fast?"

Chang Haonan originally thought that he would have to wait for a while before he could start the installation and test flight after arriving at the place. After all, the verification aircraft was quite different from the mass-produced model, and it was a product that required special final assembly.

However, the efficiency of Factory 112 obviously exceeded his expectations.

"Lingming Factory delivered the B11 machine at the end of November last year. Then we selected several shifts with the best technical skills and work attitudes among the comrades in charge of final assembly, and worked overtime to complete the No. 0201 machine ahead of schedule. ”

While explaining, He Ming turned around and led Chang Haonan towards the assembly workshop which was not far away.

Next to the pulsating production line that was gradually starting to gain strength, a yellow-painted two-seat Flanker fighter stood alone.

It was originally supposed to be one of the first batch of J-11S, but it was selected for installation testing of the turbofan 10 engine during the component production stage.

Hence the number 1010.

Chang Haonan passed by the other six aircraft being assembled on the production line and walked quickly over.

At first glance, there is no obvious difference between this aircraft and the ordinary Su-27UBK.

But if you go around the rear hemisphere, you will find that there are obvious differences in the tail nozzles of the two engines.

The right engine is still the same AL31F as other Flanker series.

However, the left engine does not have the common convergence adjustment piece, but is composed of a full circle of fixed and immovable metal pieces.

There is another layer inside.

That is, the ejection nozzle.

Compared with the convergent expansion nozzle that applies the Laval nozzle principle, the ability to adjust the airflow under low-altitude subsonic conditions is slightly worse, but the advantage is that many fish scales and connecting rods are eliminated.

It is lighter in weight and can greatly simplify the mechanical structure.

For China's current production level, this is a huge benefit.

In addition to this most obvious difference, there is also the fact that in order to be compatible with the analog-mechanical control system of the right AL31F and the full digital control system of the left turbofan 10, this No. 1010 machine is simple and crude between the belly inlet. A cable duct is installed.

Considering that the aviation engine test aircraft does not need the two heavy-load hardpoints at this location, there are no other problems except for the ugliness.

Chang Haonan circled around the plane, then stopped directly behind the plane, then raised his head and stared at the two tail nozzles for a long time.

"Finally... I caught up..."

He stretched out his hand upwards, gently pressed it on the outer surface of the tail nozzle of turbofan 10, and murmured in a low voice:

"The 100% domestically produced third-generation aircraft will be coming soon..."