Turbojet-14, the shape specifications of this engine are the same as those of the turbojet-7, which is to facilitate the replacement of J-7 and J-8 with new engines, and at the same time, this project is also to save the engine team, if the engine project is gone, then the team will definitely be disbanded.

As for the turbofan-10, this project is not yet being demonstrated, and the gap in the past few years is enough for the entire team to be disbanded.

Qin Feng looked at the turbojet-10 on the bench, after this period of test run, the surface is no longer shiny, you can see that there will be black hydraulic oil in some places, and some places have been contaminated with dust, now, looking at this engine that may be reequipped for the Jian-7 CP, Qin Feng's mood is still inexplicably excited, not too much, even if it can only provide seven tons of thrust, it will also bring a great performance improvement to the fighter, if it can have eight tons, do you still need to negotiate again and again? Just go straight to it.

Now, Qin Feng's question, someone has come to introduce Qin Feng.

"This is a project we have developed in recent years, and its biggest feature is that it is the first engine to implement the national military standard."

In the past, there was no standard for the engine, and everyone could do what they wanted, but now, with the integration with international standards, it can be found that everyone has a complete set of standard systems, so according to this system, they have developed new engines, and all projects are developed in accordance with this system, which is a huge progress for the turbojet-14.

There are no rules, there is no standard, it is absolutely not good, just like a car, before there is no standard, two identical cars, are handmade, can not be interchanged, and when the standard comes out, it can be interchangeable at will, a simple nut, if there is no standard, it can not be mixed, this is also the halo of the vortex-14.

"What happened to the breakdown just now?" For this standard, Qin Feng has not yet been able to understand its meaning, now, Qin Feng is more concerned about what the fault is going on, if it is developed with mature things, it is said that it should be smoother.

"Originally, I thought that we used the engine technology mastered in China to inherit the original engine, which would make our difficulties smaller, but now, it seems that we have underestimated the difficulty of the problem." At this time, Mr. Zhang had already spoken on the side.

At that time, they chose the mature turbojet-13 three-stage low-pressure compressor and the blade shape of the first 7-stage high-pressure compressor of Spey, which means that this can be inherited, the technical risk is small, the investment is less, the cycle is short, and at the same time, there is their turbofan six efforts, can be made as soon as possible, now, a big problem is faced, is the mismatch between low pressure and high pressure!

"Because of the matching problem of low-pressure and high-pressure compressors, our first verification machine was only tested three times, and the cumulative operation was only a few hours, and the high-pressure 1-stage convex shoulder blades were broken due to the wake vibration of 18 static blades at the outlet of the low-pressure compressor, and then, we modified the low-pressure compressor, and now the problem is that at most it will be started up and run slowly, and the thrust test cannot be increased after the slow-thrust test, as long as we convert slightly, Even just adjusting our adjustable convergence nozzle will cause high-pressure or low-pressure surge. ”

The test run just now, this is how it appeared, the surge represents the internal airflow is not smooth, if it continues, the blade must be broken again, once the blade of tens of thousands of revolutions is broken and flies out, it is not good that someone will be injured or even sacrificed.

Now, everyone is worried about this failure.

The inside of the engine is a complex fluid structure, this kind of thing, many times can not be calculated to get the correct results, can only be done through step-by-step experiments, and the general regular operation, is a level of development, starting from the first stage, slowly engaged in the second stage, and then the third pole, until all are added, so as to make a core machine.

This way is quite slow.

In the West, they don't have to worry, because the pre-research has already begun, and the accumulated experience is the richest after such a level of research and development, and no matter how much it is revised, there is no need to worry about major problems.

Now, my own side is completely borrowed, the problem of mismatch between the two compressors is quite prominent, the turbojet-13 and Spey, are originally different, and if they want to get together, they just don't work well.

In fact, when the turbofan six was just made, it was also a mismatch between the high and low pressure compressors, and it was difficult to even start, and then it took a long time to get it done.

If you want to talk about the doorway inside, Qin Feng really doesn't know very well, but now, seeing that everyone is worried about this engine, Qin Feng can only look at it according to his own inference.

"It seems that there is a mismatch between the intake flow between our turbojet-13 and Spey, and now, if you can't only improve the shape of the blades, can you add a first-stage compressor, for example, increase the low-pressure compressor from three to four, so that under the same supercharger ratio, the margin in the low-pressure area will be improved a lot, and the coordination with the high-pressure area should be easier."

Hearing his words, Zhang Lao shook his head: "No, this kind of improvement is too costly, let's try to modify the third level first, if it really doesn't work, then we'll find a way." ”

Directly add a fourth level, easy to say, how to increase this fourth level, how big the diameter, how big the blades, etc., are unknown, just theoretical calculations, it will take months, now, they can't wait, if it can be simply improved to match, they don't want to make such a big move.

Because, they are also in a hurry.

Turbofan 6 has been studied for so many years, and finally there is no installed object and it is dismounted, what about the current turbojet-14? Their established installed objects are J-7 and J-8, but now, there are too many calls for F404, if the country once it makes up its mind, it is like introducing Spey, and directly introduces F404, in this way, then their turbojet-14 will never be able to compete with turbofan engines, maybe, this project will still be yellow.

Time is of the essence!

"Actually, if you save it directly through various parts, there will be a matching problem, why don't we just copy one?" Qin Feng put forward another opinion: "Now, we are mapping and copying the imitation turbojet-15 engine, if this engine is scaled down, it will directly become the engine we need now, wouldn't it be good?" ”

Turbojet-13 and Spey, can't get together, it's not so easy, just use the R-29-300 engine directly, this engine is absolutely no problem, since Spey can be installed in a reduced proportion, then the R-29-300 is of course possible.