If it is said that the cancellation of the imported guide vane and fan front point support scheme is the old Europe since the beginning of RB199, it has been inherited, and it has become the design habit of Europe in military turbofan engines.

Then, in order to meet the 30 percent surge margin requirement for the sudden change of the army, Southwest Science and Industry can only adapt to the situation.

Fortunately, there are still many ways to improve the surge margin of the engine, and it happens that there is a relatively mature technology in the hands of the current Southwest Science and Technology.

If we want to talk about this technology, then we should count it as the design habit of the USSR in the design of military engines, which was formed in the USSR at the stage of turbojet engines.

This Soviet design habit is called the handle casing, which is a gadget designed on the fan casing of an aero engine, through which the surge margin of the engine can be increased again.

As one of the anti-Bazi of Southwest Science and Industry Technology, Chief Engineer Li naturally knows the existence of this technology, not only that, but even Chief Li also knows that Southwest Science and Industry now has this design on the turbofan 10 engine.

When Southwest Science and Industry first came into contact with this design, it should have been on the imitation of the Soviet P-29 turbojet engine that was not completed by the 420 factory, but this also benefited Southwest Science and Industry a lot when it developed the turbofan 10A.

When Southwest Science and Industry Co., Ltd. developed the turbofan 10A, in order to increase the turbofan 10 engine's not very good-looking surge margin data, this technology was used in the turbofan 10A, which significantly increased the surge margin of the turbofan 10A engine.

After all, the turbofan 10 engine has also exposed some problems in several years of use, the most criticized of which is the low surge margin, which often causes the aircraft to do large movements. Or when a missile is launched and it doesn't swallow much smoke, it often causes the engine to stop.

The engine surge margin is low. This is definitely a very big problem, which makes Southwest Science and Technology think hard. This technology was finally conquered on the turbofan 10A engine.

Originally, I thought that the excellent surge margin brought by the new Zhongtui after adopting the wide-string fan design does not need to be designed to handle the casing.

Unexpectedly, the current army has proposed to increase the surge margin to 30 percent. In that case, it is better to work according to the technical requirements of the army.

"To increase the surge margin index to 30 percent, this indicator Southwest Science and Industry can also do, using our turbofan 10A on the mature processing casing technology, we can increase the boost margin of the middle push to 30 percent!"

Speaking of which, Chief Master Li is also quite confident, there is no way, the ready-made technology is there. You can use it when you take it out, we are so capricious......

Contrary to Chief Li's ease and pleasure, Chief Meng of the Hongqi Factory, who was sitting below, was now as anxious as an ant on a hot pot, regardless of the reason why the army had changed the original 20 percent surge margin index to 30 percent just now.

The wide-chord fan design originally adopted by Southwest Science and Industry is very perverted, and it is natural to easily achieve this indicator with the processing casing, but what does Hongqi Factory use to meet you?

O my army lord! Hongqi's mid-push scheme definitely does not have a wide-string fan design, and the handling casing may be able to achieve it no matter how ruthless it is, but it will soar the surge margin from 22 percent to 30 percent as originally planned......

For such a request, Chief Master Meng could only say in his heart, "The concubine can't do it!" ”。

It was originally used to set a threshold for Southwest Science and Industry. The original intention was to let the Southwest Science and Industry not be too radical, but I didn't expect that now the Southwest Science and Industry will cross it ruthlessly, and this threshold will become set up for the Red Flag Factory.

The army did not expect that the science and technology of southwest science and industry would be so perverted, and even the 30 percent surge margin index could be easily achieved. This is already more than 90 percent of the world's active aero engines.

"This ...... The design of this processing casing is really good, I didn't expect Southwest Science and Industry to have such a technology, if the new push can use this technology. The army, naturally, has no objections. ”

The surprised performance of the army here, Chief Li naturally saw it. To seize the opportunity is to continue.

"With the treatment receiver, we were able to achieve a surge margin of about 31 percent in our engine solution. In this way, we can meet the requirements of the army, so can our Southwest Science and Industry adopt the non-imported guide vane and fan-free front point support scheme to continue to be used? ”

Chief Li's question was more sharp, but at this time, we must have such an attitude, and seize the opportunity to continuously push our projects to a more favorable position.

The army is a little shaken, this southwest science and industry can so easily reach the 30 percent surge margin index, which shows how strong the technical ability of the southwest science and industry is, perhaps......

At this time, the unique temperament of the military personnel came, just said that as long as the southwest science and industry can meet the conditions of the army, let the southwest science and industry on their own design plan, now the southwest science and industry have done it, the army naturally can not regret it.

"This is naturally possible, as long as the Southwest Science and Industry can meet the 30 percent surge margin requirements, the new push to adopt the "two nos" design, our army will not say anything more, you just look at it. ”

Although the other members of the army who were also sitting there had some different views on winning people, after thinking about what they had just said, they didn't say anything more, and the soldiers didn't have the cheekiness to change their words immediately after the previous sentence was said less than ten minutes.

Seeing that the army has no different views on the southwest science and industry plan, the science and technology commission must also express its position, and there must be a conclusion about the "double no" design adopted by the southwest science and industry.

As for what to say about the review of the Southwest Science and Industry Program and the Red Flag Factory Program, this has long been not considered by everyone, except for the Red Flag Factory and the Ministry of Aviation Industry and some final expectations, other people understand the huge gap between the Red Flag Factory Program and the Southwest Science and Industry Program.

On the side of the Science and Technology Commission, out of its own considerations, after summing it up, Director Ding raised a question.

"As far as the current situation is concerned, even if the Southwest Science and Industry Program uses more conservative imported guide vanes, it will far exceed the Hongqi Factory Program in terms of engine performance. That is to say, even if Southwest Science and Industry continues to use imported guide vanes, your Southwest Science and Industry plan will still defeat the Hongqi Factory plan, in this case, you will continue to adhere to your original design plan? ”

There is no need to think about such a problem, the Southwest Science and Industry has been summed up a long time ago, and the cancellation of the imported diversion vane and the front end fulcrum of the fan is the established design plan of the Southwest Science and Technology Association, which cannot be changed.

After all, if the current Southwest Science and Industry wants to improve the performance of the new push, it needs to be supported by one or two advanced technologies.

The Republic and Southwest Science and Industry are still inferior to the world's three aviation giants in the comprehensive process, such as the integrated welded blisk that is now commonly practical, which is not something that Southwest Science and Industry can do. At present, Southwest Science and Industry can only use a bulky falcon riveting structure, which is not small at all.

This is because now we can't get the high-tech of electron beam welding and friction welding, and we can only make up for the results of "double no".

Therefore, when outsiders look at the risky, radical and beautiful solutions used by Southwest Science and Industry, Southwest Science and Industry knows that these radical technologies have to be used. These technologies seem to be usable or not, and they are all things that must be used.

When Chief Engineer Li heard Director Ding's question, he replied without hesitation: "Yes, because what we want to design is the world's most advanced aero engine, and after adopting the "double no" technology, there will be more advantages, such as ......" (to be continued. )