Hearing that the Hongqi Factory broke out such a fierce news, Yang Hui almost spit out a mouthful of old blood, such a plan is simply absolute, if you only talk about improving the low fan and changing the fifth level to the fourth level, this is reasonable.

I want to use the turbofan 9-2 engine on the previous plane, and this is how to play it, changing the five-stage fan to the four-stage fan, and at the same time reducing the weight from other aspects.

In the end, the weight of the turbofan 9 was successfully reduced, and the size was also controlled, so that the thrust-to-weight ratio reached the American standard of 5. 5, which is also a good improvement.

But the improvement of the turbofan 9 on this side is simply amazing, which can reduce the number of fan stages of the engine at the same time, but also reduce the number of stages of the high-pressure compressor, and this reduction will have to subtract three stages......

This is a pretty devastating piece of work for a high-pressure compressor maneuver operation, and it's as vast as redesigning an engine.

Not to mention the reduction in the boost ratio caused by reducing the number of high-pressure compressor stages, which leads to a decrease in the air flow of the core engine, and finally leads to a decrease in engine thrust.

Of course, it is also possible to optimize the high-pressure compressor to ensure that the overall pressurization ratio of the compressor is not reduced, but this improvement will also move the last few stages of the entire high-pressure compressor, which is not as good as the redesign.

Yang Hui estimated that the plan of the Hongqi Factory would definitely only reduce the first 3 levels of high-pressure compressors, and would not operate on the rear 9 levels of high-pressure compressors.

After all, judging from the new mid-push technical requirements given by the army now, there is no need for the turbofan 9 without afterburner version of the 5. 8 tons without afterburner thrust.

Reducing the number of 3-stage high-pressure compressors and 1-stage low-pressure fans (while reducing the number of fans and compressor stages, it can also reduce the 4-stage stator ring) can effectively control the weight and size.

But such a design is not favored by Yang Hui, even if Hongqi Factory achieves this technically, it has no advantage.

On the basis of the turbofan 9, the new medium thrust is improved, and the biggest highlight is the surprising thrust of the turbofan 9. The thrust without afterburner can reach 5. 8 tons. After turning on the afterburner, it will definitely reach 9. Between 5 tons and 10 tons.

Thinking about such data, it can be combined with the existence of the F414 engine, and with the new annihilation plan of Southwest Science and Industry, it is definitely an air-ground double excellence.

Now by reducing the thrust to control the weight and size, it may be possible to control the size of the engine to 4. 3 meters long, the push ratio may reach the level of 6 of the American standard.

But what's the use? The thrust was reduced to 8. 5 to 9. between 5. Compared with the new push plan of Southwest Science and Industry, it is obviously suppressed everywhere, and the two are almost the same as the thrust.

But the size gap is highlighted, the 8 of the Southwest Science and Industry Program. The 5-stage high-pressure compressor, the three-stage low-pressure fan, and the short annular combustion chamber design can completely control the length of the engine below 4 meters, and the diameter is 0 at most. 9 meters in appearance

Not to mention the problem of thrust-to-weight ratio, the effect of weight reduction is achieved while controlling the size, and then using the unique titanium alloy processing technology of Southwest Science and Industry, the most conservative estimate can also reach the American standard 7. 5。 If there is no problem, it is not impossible to achieve a push ratio of 8.

As for the medium and high-altitude performance of the new medium push of Southwest Science and Industry, it is impossible to be too good to be realistic, after all, according to the combat height of the new annihilation, it is not something to fight at high altitudes.

However, the medium and high-altitude performance of the Southwest Science and Industry Program is definitely better than the current turbofan 9, and it will not lag behind the improved turbofan 9 proposed by the Hongqi Factory.

Anyway, after Yang Hui heard the plan of the Hongqi Factory, he was still a little worried and put it down, and the Hongqi Factory took the initiative to give up the thrust performance of the turbofan 9 to compete with the Southwest Science and Industry Medium Push Program, which was definitely the strength of attacking the enemy with his own shortcomings.

There is nothing to say in the subsequent introduction. It is nothing more than some improvements to the turbofan 9, such as: the simple convergence tail nozzle of the original Spey 202 has been changed to a convergent diffusion type. And then there's ......

In short, there are some small improvements in the back, and the sum of all items is not bad......

Until the end, Chief Master Meng made a concluding speech, which seemed very stylish.

"In short, our Hongqi factory's plan is. By appropriately reducing the thrust of the turbofan-9 engine, in the case of meeting the requirements of the new medium thrust. The size and weight of the engine are controlled, and the high-altitude performance of the engine is compensated. Of course, our solution will definitely inherit the high reliability, low fuel consumption and long service life of the British Spey engine, which will also be the advantage of our Hongqi factory plan. ”

Having said that. The promotion plan of the Hongqi factory was almost introduced, and the participants also understood the advantages of the Hongqi factory plan.

After Chief Master Meng made a final summary and bowed and walked off the podium, there were bursts of applause from the audience.

To be honest, judging from the current plan of the Hongqi factory, it is indeed a very good plan, if it can be developed, it can at least be at the same level as the Rd33 engine in the future, even if there is a difference, it will not be too bad.

As Chief Meng said in the end, the three advantages of high reliability, low fuel consumption and long life of the Hongqi factory plan will poke the sore spot of the RD33 engine.

"Very good, the Hongqi factory plan does perform remarkably, that is, there are radical points, and at the same time conservative, based on the existing engine base, dig deep to chew the advantages of British aero engines, the country at that time to hand over the turbofan 9 engine to the Hongqi factory localization is indeed a good choice......

At this time, the Ministry of Aviation Industry jumped out and agreed with the Hongqi Factory plan, as if the Hongqi Factory plan would definitely get the final engine project.

This kind of behavior does not seem to be inconsistent at all, presumably everyone is used to this kind of behavior, if the Ministry of Aviation Industry did not jump out at this time, then it is ......

At this time, the military really couldn't stand this kind of hype, so they stood up and said a few words.

"I think it's almost time, it's time to suspend the meeting at half past 12, everyone should go back to dinner, and the Southwest Science and Industry Plan will be reported in the afternoon."

The army really couldn't stand it, and sacrificed a big move to "eat away", and the Science and Technology Commission also stood up, this time it was also a meeting at the Science and Technology Commission, and the master's family still had to look like the master's family.

"Yes, yes, it's all time for dinner, everyone will go to the canteen of our science and technology commission to have a working meal, although the taste is not very good, but it is absolutely full!"

In these years, being able to manage enough is already a mantra summed up by years of experience, after all, the past days are indeed a little too ......

The Science and Technology Commission and the military have said that they are going to end, so naturally they can no longer be verbose, and the noon meeting is over, but it is only the beginning.

The working meal is the working meal, and the working meal in the imperial capital is even more of a working meal, and the taste is good and at the same time, it also thoroughly implements the requirements: four dishes and one soup, and it is indeed a full meal.

In the dining room, the second institute here also worked hard for the mid-thrust turbofan engine this time, and Mr. Wen naturally didn't care much about the military engine because he wanted to develop the CG2000 engine.

However, the second institute is not weak at all in the aero-engine talent reserve, and the chief engineer of the turbofan 10A will once again take command of the chief engineer of the new Zhongtui this time.

As for the other people who came to the meeting together, there were even more people, Jiang Hefu and Xiang Qiaona all came to this meeting together.

"Mr. Yang, what do you think of the plan of Hongqi Factory? I don't think Hongqi Factory has much chance of winning like this, I don't know ......"

The first time he heard Xiang Qiao ask his question, Yang Hui was not too surprised, just smiled and nodded.

"That's right, it's worse than us in all aspects, if they can preserve the three advantages of the British engine, then it's a little interesting, otherwise our plan will completely suppress it!" (To be continued.) )