"On the contrary, the reason I didn't choose this option is that it has changed so much."

Chang Haonan's words made Zhang Man's smile freeze on his face.

"Remember what I just said, based on the existing mature technology, although this enlarged version of the scheme seems to have little change in appearance, but if it is implemented in manufacturing, the entire body will change, and it also needs a stronger aero engine, which is not in line with our principles."

Zhou Shuwan's face next to him finally looked a little better, he didn't care much about his idea being denied, he was just worried that Chang Haonan really misunderstood what he meant.

"After all, we have some professional training, and when we see a design, we can't just look at the shape intuitively like when we were freshmen, but we should be able to think of something deeper." Chang Haonan said this, and glanced up at Zhang Man opposite.

"Hey, I can see something deep, you don't know, I don't have more than 80 points in professional classes other than English, and I just listen to Nanshen for technical matters, Zhang Man, do you have any other plans?"

Wu Yifan's words eased the situation just right, which not only gave Zhang Man a step down, but also avoided too stiffness between her and Chang Haonan.

After being slightly beaten by Chang Haonan, Zhang Man quickly recovered his original bright and brilliant expression, as if nothing had happened, but he didn't make any small moves, just pulled out the last piece of information.

In fact, compared with the previous two real materials, this time Zhang Man took out only two photos.

"There is another kind here, which is a technical verification machine of the MiG Design Bureau, called Ye8, and there is no detailed information, from the photos, it seems that the nose air intake is directly changed to the belly air intake, and a pair of front wing ...... are added."

Before Zhang Man finished speaking, Chang Haonan directly picked up one of the photos and looked at it.

The Ye8 itself has more changes than the MiG-21, and it also involves the problem of three-wing surface control, which is also not a design that can be completed in a short time, but the pictures on the table help him recall an unpopular improvement of the J-7 - J-7FS.

An improved design that changes the nose air intake of the J-7 to a mandibular air intake, but the rest of the fuselage, especially the rear fuselage, remains the same.

Because this project was completely self-funded by the 611 Institute, there were no start-up users, and the research on the mandibular air intake was not in-depth enough back then, so only one prototype was built for flight testing.

However, Chang Haonan knows that the potential of this improved model is actually not small.

More importantly, the study of the mandibular intake is of great significance in itself.

Because future air-breathing hypersonic vehicles will also use air intakes of similar structures, but more advanced.

Before Chang Haonan was reborn, he was preparing to test a hypersonic missile design using a mandibular three-dimensional inward turning air intake.

According to the timeline, this modification should not have come out in 1996, and it may not even have started.

"The design of the air intake of the J-7 aircraft has been improved so that it can adapt to larger radar sizes and ensure that the flight performance is at least not weaker than the original model.

The specific idea is to change the nose air inlet to a dual-module mandibular air intake, free up the nose space for the radome, and the radome can be used as a cone precursor, and the air inlet is integrated to achieve the first-stage compression of the incoming flow, which is the external compression mode facing downward.

The air inlet realizes the secondary compression of the airflow, which is an internal compression method that is oriented to both sides and upwards, and the rest of the body remains unchanged. ”

As Chang Haonan's ideas continue to improve in his mind, the system also gives new hints:

[Improve the project to consume science and technology points: 8 points, directly give the project result consumption points: 80 points, do you confirm the implementation of the J-7 aircraft air intake improvement project?] 】

"Confirm!"

Almost like yesterday, in the moment after Chang Haonan confirmed the project, a huge amount of information appeared in his memory almost in the form of imprints, and although he had not been exposed to a lot of knowledge for many years, he was as proficient as if he had used it thousands of times.

In other words, the system can not only give specific steps to complete a project, but also improve Chang Haonan's relevant capabilities at the same time.

And this ability does not disappear with the completion of the project, for example, the proficiency he gained yesterday in operating the fluid dynamics simulation software of this era and the ability to directly program the partial differential equations in the Fortran language still exists.

It's just that if you want to achieve an inhuman operation that is as efficient as yesterday, you still have to rely on the buff provided by the system for ongoing projects.

"Haonan, are you going to choose this?" Zhou Shuwan also took another photo and looked at it: "But isn't the design change of this three-wing surface even greater?" ”

"No, it's just a similar idea." Chang Haonan shook his head

"The YE8 scheme is designed with the air intake in the belly, which has led to a big change in the entire body structure, and we can advance the air intake to an almost flush position under the nose and design a mandibular air intake."

Chang Haonan took a pen and paper and drew a simple drawing, and at the same time said his design ideas in a simple and popular way as much as possible.

"In this way, the length of the air inlet is close to the original design, the part after the 1Г cross-section of the body does not need to be changed, and we can also use the radome as part of the air intake mechanism for the overall design, and the conical radome pre-compresses the gas to improve the overall air intake performance."

The reason why these tongues are necessary is naturally not that Chang Haonan is a good teacher, but according to the design method provided by the system, it is first necessary to artificially determine the half-cone angle of a conical precursor, and then the optimal solution for the corresponding inlet design can be calculated.

In other words, the combination of air inlet/cone precursor designed under different half-cone angles is very different.

However, Chang Haonan did not know how many half-taper angles, and the corresponding design scheme had the best effect after being installed on the J-7.

In the field of design, the selection of the initial value is largely based on experience, but Chang Haonan was reborn as a military screw, and did not have the experience of focusing on the overall design of a model......

So he needs to make several different plans next, simulate their performance after combining them with the J-7 airframe, and then find out the rules from them, and finally find the best choice.

There is a lot of work in this process, but a lot of the content is actually not innovative and repetitive, so it can be completely handed over to three other people to complete, and Chang Haonan himself concentrates on the most critical parts.

First, this will improve efficiency, and second, it will also be in line with his vision of the future use of the system, which is a rehearsal.

"It's a lot less work, and a lot of the parts are even the same as the original model."

Zhou Shuwan hammered his fist on the palm of his other hand, making a crisp sound of "snap": "Then Haonan, let's talk about what to do later, we will all listen to your command!" ”