The R&D cycle of Xinzhongtui is definitely not short, and Wang Zhengguo can be very sure of this point, and when it is really in service. That will probably wait until about 2000, after all, it is a new development of 606 institutes, and bumps and bumps must be indispensable.

Don't you see, it is also a medium-push engine project established in the early eighties, and the two engines developed in Europe, which one did not wait until about 2000 to mature and be installed, is it possible that the ability of 606 is stronger than that of Europeans?

Since it is a military afterburner turbofan engine that was positioned to enter service around 2000, the bypass ratio should of course be a little smaller and smaller, just like Rolls-Royce's EJ-200, the bypass ratio is only 0.4, and the bypass ratio of M88-3 is only 0.3.

As far as the bypass ratio of the thrust engine is concerned, all of them are only between 0.3-0.4, and the bypass ratio of the thrust turbofan engine developed in the seventies and eighties is often more than 0.5, and the bypass ratio after 2000 is obviously the smaller the better.

This also persuaded: "The previous super seven engine bidding, it seems that the Americans are also coming, and what is the situation of the engine they brought, you should understand very well that those turbofans with a bypass ratio of about 0.3 are actually no different from turbojets when they are actually thrust output." ”

Some people don't understand what Wang Zhengguo wants to mean, what is the difference between turbojet and turbofan engines, and there is a vote of American engines, which is a bit ......

He held his sleeves and sat upright: "The Americans did recommend two engines to us, including the F-40***-1120 models, do you have any different views on these two engines?"

After listening to this news, it is really still the old routine of the upper plane, and the two engines recommended by the Americans can actually be regarded as the first-line mainstream of the eighties, no matter which one is a well-known.

Fortunately, this time the Americans directly gave two engines to choose from, so that it is better to explain and compare.

"Oh? That's good, I think you also have a general understanding of these two engines, the P-1120 is called a turbojet engine, but it is continuously drafted from a low-pressure compressor, and the air drawn from the low-pressure compressor flows through an outer duct, and the effect is to cool the engine at high temperature, but in fact, it is no different from a turbofan engine in terms of thrust. ”

Speaking of the P-1120, Wang Zhengguo still admires the engine, if this guy is used in an interceptor, it is simply a perfect match, but unfortunately it was born at the wrong time in the end.

As for the bypass ratio of this engine, it is actually about 0.18 position, which is used for external bypass cooling and cooling, which is completely sufficient, and the early bypass ratio of F-404 is as high as 0.26, which is naturally not much different.

"According to what you mean, this means that the 606 side will also make the new Zhongtui a design similar to the P-1120 and turn it into a quasi-turbofan engine?"

Guessing someone's proposal, Mr. Tu is also carefully weighing the pros and cons of such a design, not relying on the outer duct to generate thrust, which means that the engine thrust source is still in turbojet mode, which can have a very good high-altitude and high-speed performance, but is this really good?

"The outer airflow is used for the cooling and cooling of the engine, which is actually a good idea, as long as the new push has continuous deflation behind the low-pressure compressed air, and then if necessary, increase the specific flow rate of the degassing, it is a turbofan. ”

Someone naturally put forward the best suggestion, which probably pointed out a fairly bright path for 606, the reason why the high-pressure compressor and the low-pressure compressor of the upper plane turbojet 14 do not match.

That is because the air flow of the low-pressure compressor is too much, and the high-pressure stage is not needed, which naturally leads to the outbreak of the problem, this time if the continuous deflation requirements are proposed, it can directly solve the problem of mismatch between the high and low pressure compressors.

It is easy to say that it can be led to the outer duct, which is just a double benefit.

It must be known that the J-8 series has always been installed with a thermal insulation layer in the engine compartment, the reason is that the engine temperature is too high and the aircraft will be burned, and after the engine is cooled by the outer duct airflow, this thermal insulation layer can also be said to be goodbye.

What is the difference between an engine with duct cooling and an engine without cooling?

The simplest example, the F-404 engine can be tested with bare hands, and the famous F-16-79 is sprayed so badly because it installs a heat shield weighing nearly 1 ton on the J-79 turbojet engine.

This is the gap, the problem of high engine temperature must be solved, either the outer duct airflow to cool the engine, or the engine compartment is covered with thermal insulation.

In contrast, it must be that the scheme of duct air induction cooling is more reliable and cost-effective.

"That's probably it, as the chief engineer of the Super Seven Project, you definitely have the right to put forward the requirements for the engine, in this regard, I believe that the military will consider it carefully, and the new medium thrust should no longer be a simple turbojet motive. ”

This time, Wang Zhengguo really made up his mind, and he must turn the new Zhongtui into a new product that is completely different from the upper plane turbojet 14, not only from the engine structure design, but also from the fundamental change.

"Also, for the two models of Super Seven and J-8, both of which use 8 tons of thrust RB-199-MK104, presumably the thrust data of the new medium thrust should not be lower than the data requirements of 8 tons, right?"

The turbojet 14 in the upper plane is only used to replace the turbojet 13, an engine with a maximum thrust of 6.6 tons, so the target is 7.4 tons of thrust.

But now it's different, the new thrust is to replace the RB-199-mk104, a guy with nearly 8 tons of thrust, and since it is an engine update, the maximum thrust data can only be increased, not reduced, so think about it.....

"Of course, it can't be less than eight tons of maximum thrust, which is very certain, I'm afraid it will have to reach between 8.2 and 8.4 tons, as for the thrust-to-weight ratio, I just hope to be able to pass 7, no more is unrealistic. ”

Regarding the basic data requirements of the new push, Tu Jida must know it, roughly speaking, he is acceptable, and when the time comes, the super seven will be replaced with engines, and the new push will be acceptable.

Of course, it really has to wait until the new Zhongtui completes the design finalization, whether it is necessary to replace the super seven with a new engine, in fact, this is really hard to say, after all, it is already 2000 years later.

But having said that, a leaky turbojet engine that can squeeze out 8.2 tons of thrust, and when it comes to the new century, it only needs to be improved, and it is not impossible to achieve a thrust ratio of 8 and a thrust of 9, and this is a standard third-generation thrust turbofan, 601 If you still want to do middle four in the new century, you may not have to worry about the engine.

"I hope everything will go well with the new Zhongtui, but Super Seven should not be in a hurry to ask for the engine now, and we can put this aspect down for the time being. The domestic avionics and engines already have eyebrows, so is the radar planned?"

Anyway, I've already inquired about the Super Seven project, but I don't mind talking more, after all, the importance of radar is not low, why don't you also intervene?