Chapter 81 Turbojet 14 (Magic flying for the helmsman luppp002 (page 12)

Due to major changes in the design of the No. 04 and No. 05 demonstrator aircraft, the day after the first flight of the No. 04 aircraft was completed, Yang Fenghata quickly presided over a work meeting involving different factories of the rd Project. Coordination meeting to determine the current technical status of the rd Project.

Different from the previous progress seminars that were just within the 601 Institute, this meeting was of a higher level and covered more and wider fields, with several times the number of participants.

Overall, the improvement work related to the wing is progressing very smoothly.

While Chang Haonan was designing the slats, the wing structure research team successfully arranged the relevant pipelines and hydraulic mechanisms for the leading edge slats into the main wing structure at the expense of reducing the volume of the wing fuel tank by about 5%. The entire improvement project saved the most time.

Lin Shikuan's digital design team also connected with Factory 112 and successfully introduced digital manufacturing technology into the improvement and production process of the new wings of the 04 and 05 prototypes.

This allows Factory 112 to start production preparations for the new wing almost simultaneously with wind tunnel testing after obtaining complete design data.

During several days of wind tunnel testing, the flight control design team calculated the aircraft control rate under slat conditions as quickly as possible and made corresponding modifications to the previous flight control system.

They have accumulated considerable experience in the design of analog and digital fly-by-wire flight control in the past J-8ACT and the J-8IIACT active control technology demonstrator aircraft that will soon make its first flight, so their capabilities in this area are quite reliable. .

It is precisely because of all the above reasons that the No. 04 prototype was able to complete improvements and fly again in such a short period of time, and the key components of the No. 05 prototype have also begun production.

The new overall arc windshield led by Yao Mengna has also completed the structural design and installed the first sample on the No. 04 prototype. She is assisting Factory 112 in designing a new molding and clamping system control software to ensure Improve the quality of molded parts and reduce the scrap rate.

However, if it was all good news like this, then there would actually be no need for Yang Fenghata to hold this meeting.

The problem still lies in Feifa matching work.

After the inlet professional team and the 14 Institute responsible for the WP606 engine worked together, they still could not find out the root cause of the engine's possible smoke-inhaled shutdown after the missile on the inner pylon was launched.

Objectively speaking, the working conditions of the engine when the PL8 or PL11 missile is launched are indeed very poor——

When the 612 Air-to-Air Missile Research Institute in Luoyang developed the Pili 8 air-to-air missile, there was no smokeless propellant that met the performance standards in China, so the pyrotechnic effect of this missile when launched was very spectacular.

Coupled with the WP14 engine, which is not very stable to begin with...

This is a problem caused by the weak aviation industry system.

China is not alone in the world in using smoke or micro-smoke propellants. In fact, as long as the aircraft and engine are properly designed, a small amount of primary smoke composed of carbon particles and metal oxides will not affect the launch platform.

For a powerful country in the aviation industry, even if a certain link in the equipment system is not perfect, it can often be made up for by leaving margins in other aspects.

But for China in the late 90s, every link in the equipment system was not perfect, and it was already very difficult to meet its own design targets. Therefore, once something went wrong, it was difficult to count on other parts to help fix it.

When the topic came here, the warm atmosphere at the beginning gradually turned serious.

Fortunately, although China's aviation industry system lacks capabilities, it at least has unified leadership and there is no phenomenon of mutual criticism between different systems.

At this time, Institute 601, Institute 606 and Institute 612 are a whole, and it is useless to blame others. The key is to find ways to solve the problem.

"Since it is currently impossible to determine where the specific problem is with the engine, we might as well change our thinking."

Finally, a comrade from the overall design team put forward his own idea:

"The detachment method of the missile on the innermost pylon can be changed from the slide rail type to the ejection type or the drop type. This can reduce the smoke concentration faced by the engine, thus reducing the failure rate."

Chang Haonan, who was sitting in the first row of the conference table, wrote this question in his notebook and frowned slightly as he thought about it.

This comrade's idea is certainly feasible.

The missile needs to be tightly connected to the aircraft through the lead frame and hanging beam.

The so-called slide launch means that the missile is ignited directly on the launcher and relies on its own thrust to slide along the track and leave the launcher.

As for ejection and drop-type launches, the missile first leaves the launcher through the ejection mechanism or its own gravity, and then ignites in mid-air.

Since the missile is already at a certain distance from the carrier aircraft when it is ignited, the impact on the latter will naturally be much smaller.

In fact, these two methods first appeared to launch heavy air-to-ground missiles that were relatively noisy during ignition.

There is no problem in dealing with the similarly noisy Thunderbolt 8, as well as the future Aspad or Thunderbolt 11/12.

But everything has a price.

These two methods have strict requirements for overload during launch, and as a weapon used in close combat, the Thunderbolt 8 often needs to be launched under conditions of large overload.

So if this method is really adopted, it basically means that the inner pylon can only carry medium-range air-to-air ammunition or auxiliary fuel tanks.

More importantly, Chang Haonan didn't like to avoid questions like this.

Although the smoke concentration when the Thunderbolt 8 is launched is very high, it can be launched normally when mounted on the previous J-7E and J-8B.

The R27 medium-range air-to-air missile, which also does not use smokeless propellant and is more noisy when launched, can even be launched directly under the Su-27's inlet.

So no matter what, WP14 must have flaws.

Even if the immediate problem is solved by changing the launch method, the two unstable engines will still be a hidden danger.

It must be changed!

The truth of this matter is not complicated. Chang Haonan can see it, and other people participating in the work coordination meeting can naturally see it too.

Moreover, changing the missile detachment method actually does not require any changes to the aircraft itself, just changing the guide frame, and it does not even require the participation of any unit in the 83rd Project.

Therefore, this proposal was ultimately chosen as a fallback alternative.

On the other hand, due to the major changes in the wing design, Project 606 has an additional prototype. It is expected that the number of test flights will be more than originally planned. The Institute and the inlet professional team will also have the opportunity to solve the problem. Investigate the cause.

Of course, the safest way is to give up the turbojet 14 and go back to the slightly inferior but proven turbojet 13F2.

But not only the 606 Institute, but also other people involved in the August rd Project were unwilling to do this.

The reason why China's aviation engine development has been bumpy is that, in addition to its weak foundation and the high difficulty of aviation engines becoming the crown jewel of the industry, another important reason is that our aviation engines have always been used as corresponding aircraft. The project exists in conjunction with it.

This is not only true for imitations, but also for self-developed models.