Chapter 665

However, the success of aviation in how impatient, there is no way to take off group side, aero-engine development cycle is placed there, not to take off group want to quickly up.

What's more, compared with the previous model, the difficulty of medium thrust aero-engine has increased sharply. Among other things, when the hx-4-1 core engine is developed to the third generation, the temperature in front of the turbine is only 1280 ℃.

But this temperature did not even reach the minimum target of 6 MW core machine.

It should be known that the performance index of the 6 MW core engine, namely hx-6-11 medium core engine, formulated by Tengfei group is as follows:

the air flow rate is 11 kgs

the compressor pressure ratio is 8.4

the total gas temperature at the outlet of combustion chamber is 1600 ~ 1650 Kelvin

the number of turbine stages is 1

the design cycle power is 6 MW

Kelvin is the internationally accepted temperature before turbine It's about 1326 degrees centigrade in 1600 Kelvin.

In other words, the entry-level standard of hx-6-11 is higher than that of hx-4-1.

Every time an aero-engine is raised by one degree centigrade, a lot of money and experience will be invested in materials, technology, engineering, design and manufacturing. It can't be made by drawing a drawing.

Because of this, the research and development of hx-6-11 medium-sized core aircraft has been carried out by Tengfei group, which has also been listed in the 863 key development project and the "Eighth Five Year Plan" project by the state.

However, it will take at least five years for Rao to produce an engineering prototype. If there are twists and turns during this period, seven or eight years are common, even more than ten years is not surprising.

There's no way. It's not a good leap to improve the heat resistance of turbine blades alone. It needs a variety of means to use comprehensively. It involves several categories and dozens of disciplines, which is a great test of the comprehensive strength of the research and development unit.

Just because Tengfei group has a serious lack of experience in this field, it can only work with other scientific research institutes, key universities and other supporting plants to tackle key problems. The problem is that many technologies are blank in China, so we can only explore from scratch.

For example, in order to increase the heat resistance temperature of nickel based alloy turbine blade, a layer of ceramic coating is needed on the surface, because the ceramic has high heat resistance, which can effectively protect the turbine blade from high temperature burning.

However, this kind of ceramic coating is not a ceramic tile at home, which can be formed by burning it in the fire. It needs to bear high temperature, and at the same time, it must have certain toughness and strength, because the coating not only bears high temperature, but also bears the strong centrifugal force when the turbine rotates at high speed.

However, ceramics are known to be fragile, so how to overcome its fragility, make it not fall off and break when the blade rotates at high speed, and make it easy to process, can drive experts and engineers in this field crazy.

This is just a small epitome of hx-6-11 medium-sized core engine's convenience in tackling various technical problems, such as the application of integral disk, compressor integrated bearing, integral blade disk and metal matrix composite materials

Almost every one of them is maddening.

So I just want to make Tengfei group fast, but I can't.

Successful aviation naturally knows the actual situation of Tengfei group. Although it is anxious, it can only wait. Fortunately, the so-called light fighter project is only at the stage of theoretical demonstration. Even if Pakistan makes up its mind, the engineering design will take several years to complete, so it is still time for successful aviation.

However, the Pakistani military delegation is not aware of these matters. Of course, even if it knows, the Pakistani military will not post it to Tengfei group.

Because they want high-performance intermediate trainer and light fighter, rather than a separate aero-engine.

What's more, in terms of the power of light fighters, successful aviation has not been able to make a difference, let alone the Pakistan military delegation.

As for the power of the intermediate trainer, China may not get an American engine for some reason, but Pakistan has a very good relationship with the United States because of the invasion of Afghanistan by the Soviet Union. It's just a low thrust engine, and it's not for nothing. The Americans don't want to lose face and there is no power vacuum.

Therefore, during the intensive itinerary of the Pakistani military delegation, there was no visit to Tengfei group at all.

As a result, major general Zarif, as a military officer of the Pakistani embassy in China, who witnessed the shocking scenes of yun15, was exactly the intermediary between the Pakistani military delegation and China this time. Major general Zarif and lieutenant general Rahman, who led the delegation, were also classmates of the military academy. Later, they were sent to the United States for further study, and they died together after returning home Through New Delhi.

Properly with the window, together with the gun, vaguely also with the whoring what pure iron friends.

So at the beginning of meeting Rahman, Zarif began to praise yun-15, then talked about the shocking scenes with photos, and finally fell to the theme. He hoped that Rahman could go to the manufacturer of yun-15 to have a look, and had better order some back.After all, the itinerary was decided in China. Moreover, the entire Pakistani military delegation of more than 40 people belonged to different departments and factions. Although Rahman was the head of the delegation, his real power was not strong. Because of this, Zarif's first several persuasions were prevaricated by Rahman.

I thought this would be the end of the journey, and then I went back to my hometown to hand in the work.

As a result, Rahman underestimated Zarif's perseverance. If he couldn't do it once or twice, he would do it three or four times. If he didn't agree, he would just take it as chanting scriptures and torture Rahman to nod his head.

That's all. Zarif also took advantage of his familiarity in China to attract the delegation with the local products that are popular in Pakistan.

As the saying goes, short mouth and short hands, although it's a local product, it's also a face. What's more, Zarif's request is not too much. After visiting the successful airlines, he stopped by to see the Tengfei group.

And the reason is also very formal, investigate the production of intermediate trainer replacement power.

As for the investigation of aviation power, we don't go to the take-off aviation power plant of cotton, but to the Xiping plant of aircraft manufacturing. No one cares about these details. Anyway, it's all the take-off group. It's the same everywhere? It's like taking the local products in your hand. It's not for whom to use them!

In this way, Zarif, relying on his old relationship, old classmates, old local products and his transcendent status as a military officer in China, will just insert an unplanned part in the scheduled itinerary of the military delegation.

So this was the scene of a Pakistani military delegation visiting Tengfei group.

However, because Pakistan's military delegation is not monolithic, some people give Zarif face, so naturally some do not buy it. For example, Professor Ali Khan from the Department of Aeronautics and Astronautics of Karachi Polytechnic University and his two assistants scoff at Zarif's practice.

I think it's a deal within the military. I'm not only opposed to the change of itinerary, but also publicly accused Zarif of using power for personal gain. However, I can't wring my arm and thigh. Professor Ali Khan still doesn't see how honest he is in front of the military, so even opposition is like farting. No one cares.

this makes professor Ali Khan helpless and annoyed. In his fury, Professor Ali Khan, who didn't come along together, came to the Tengfei group.