For this time, after the adoption of the non-imported guide vane and fan-free front fulcrum scheme on the new push, there is another point that Southwest Science and Industry also recognizes.

"We have adopted a "double no" design, which not only reduces the front bearing points of the fan, but also greatly simplifies the design of the entire engine oil system. ”

To say that the engine oil system is not simple at all, as far as the current technology of Southwest Science and Industry is concerned, it is not impossible to design the oil system for the front support point of the fan, but this will greatly complicate the engine oil system.

The lubricating oil system of the aero engine does not sound very eye-catching, and it seems to be a somewhat incomprehensible design, but insiders will never think that the quality of the lubricating oil system does not have much impact on the whole engine.

How important is the oil system of an aero engine? If there is a problem with the lubricating oil system, what will happen?

Needless to say, it is enough to cite the crashes that occurred after the delivery of the No. 10 project in the previous face.

The AL31F engine was used in the No. 10 project of the previous face, and this engine was not intended to be used for single-engine fighters when it was designed, because when Maozi designed this engine, there was a big problem in the design of the lubricating oil system.

The twin-engine design of the Su27 series is naturally not prone to problems, but the huge design problems of the 31F engine were exposed in Project 10.

Sixty percent of all crashed No. 10 engines were engine problems, and 80 percent of those engine problems were caused by 31F oil system problems!

To talk about these problems, in fact, Lao Maozi himself knows, but because the overall design of the engine is like that, it is impossible to improve the lubricating oil system without major surgery.

So to speak. The performance of all 31F engines is unreliable, and this problem is like the hypochondria of the Su-27 body itself, which was solved on the Su-35 after the overhaul, and the 31F at that time has been overhauled to the F117 engine.

Ultra-complex industrial products such as aero engines strive for fewer parts to increase reliability. This is especially true for the lubricating oil system of an aero engine.

For these problems of the 31F, Chief Li naturally does not know, and even the army of the Republic itself does not know.

The current No. 10 project of the 611 Institute has been determined earlier than the previous one to replace No. 10 with 31F, but Yang Hui has no way to deal with the lubricating oil system of 31F.

It's really the design of the 31F now, the Soviets themselves don't care, what are you still picky about in the Republic?

It's good to be willing to provide you with the engine, haven't you seen that now we bother to change the installation position of the engine casing for you?

Yang Hui can guess this situation without thinking about it, after all, the current Soviets are still indulging in the last glory. The self-confidence of a strong power still makes Mao Zi maintain absolute pride.

No matter what the problem of Lao Maozi's 31F is, Southwest Science and Industry naturally has no leisure to take care of it, seize the time, and it is serious to win the current mid-push engine project.

And everyone in the audience is quite clear about what Chief Master Li said about canceling the front point support of the fan, as well as the simplified structure brought about by this design.

Now for the "double no" design adopted by Southwest Science and Industry, there is no large-scale opposition at the beginning, except for those who agree, most of the remaining people do not evaluate this design.

At this time. Success is already on the horizon, and we only need to offer the last advantage of the new Zhongtui design. The Southwest Section program is also considered to be completed.

And this last advantage is different from the "double no" design as controversial, the last advantage is undoubtedly the finale design, which is also a major decision made by Southwest Science and Industry for the special needs of military turbofan engines.

At this time, Chief Engineer Li was also quite confident: "After we cancel the imported guide vanes, we can simplify the engine control system again. And we also have some new attempts for the design of the control system of Xinzhongtui. ”

The so-called attempt at a new engine control system is to say that Southwest Science and Industry in order to meet the special requirements of military engines: rapid response.

To do this, the best solution is to use a full-authority digital control system, but in the current situation of Southwest Science and Industry, and even the entire republic. It is quite difficult to do this.

The full-authority digital engine control system is definitely not such an easy technology to overcome, but Southwest Science and Industry is now developing a new military push to take into account the performance requirements of metamorphosis.

This also requires Southwest Science and Industry to upgrade the traditional mechanical hydraulic control system, that is, dissatisfied with the hydraulic mechanical control system, and has no confidence in the full-authority digital control system.

As a result, this gave birth to the "electrical, hydraulic joint control system" that Southwest Science and Industry is ready to adopt in the new middle school.

As the name suggests, this is a conservative compromise that retains the traditional full set of mechanical and hydraulic control systems, while also adding electronic control systems to some controls that have a significant impact on engine performance.

This design not only ensures the safe use of the engine, but also improves the performance of the engine through partial electrification control.

The control scheme of this engine is more similar to the single-axis three-redundant flight control system of the Southwest Science and Industry J-74, which is an incomplete digital control scheme.

Such a design, although not as good as full authority control in terms of performance, but also a qualitative leap over a single hydraulic control system, the only price to pay is the weight of those digital controllers, but the weight of these things is only 20kg.

With a weight of 20kg in exchange for a good engine performance improvement, it is still quite cost-effective, and the most exciting thing is that after the partial use of digital control, the follow-up improvement of the new push can go further, and it is not difficult to use the tall full-authority digital control system.

For these designs, Mr. Li has already had a variety of good and bad evaluations, and naturally he is confident in the plan report at this time.

"We will use electrical and hydraulic joint control systems on the engine, and this design scheme is widely used in some military aero engines, such as the F101 and F404 engines in the United States. While conservative and innovative, this scheme is very meaningful for our new push-in design, and we can even take it step by step in the future, and achieve full-authority digital control in continuous improvement. ”

I know that the Southwest Science and Technology Union is such a design, Chief Meng sat in the audience, there was no expression, according to the current plan of the Southwest Science and Industry, all aspects are the plan of the Red Flag Factory.

And these solutions are still completely feasible for Southwest Science and Industry, and at this time it finally reflects the gap between the two sides in terms of technical background.

Shaking his head, Chief Master Meng sighed dejectedly: "This time the development project of the medium push engine, I'm afraid there is nothing to do with our Hongqi Factory, it seems that the future of our Hongqi Factory will continue to be confused!" ”

Hongqi Factory is like this, and there is probably no suspense about the final result...... (To be continued.) )