The military-industrial scientific research system of the academic master.

After no longer worrying about power, when I look at the schematic diagram of the aircraft on the PPT, I feel completely different.

There are no disadvantages, only advantages.

If I have to say it, it is because as the aircraft becomes larger and heavier, the flexibility or agility will inevitably decline. Moreover, after losing the area rate design that was almost the theoretical optimal solution in the past, the maximum speed on paper will be reduced. There may be some reduction.

But because of the larger thrust engine, there will certainly not be any major regression in terms of overall mobility.

Times have changed, my lord.

These are no longer the days of machine-gun fighting, and the loss of agility is not important at all.

"Then, let's continue to look at the improvement plan for this Class II prototype."

"First of all, the most obvious improvement part is naturally the air intake. Regarding the overall design idea of ​​this part, I have discussed it with Mr. Song and Mr. Yang before, and since last year, I have been working on it with the help of my brother units. Research in related fields is laid out below.”

"This time we also invited Chief Engineer Sun Huizhong from Guihang Industry. He will serve as a member of the No. 10 Project design team in the subsequent design process..."

Hearing his name being mentioned suddenly, Sun Huizhong's face showed an expression of shock and a bit of surprise. He quickly stood up, turned around and greeted the venue behind him.

Originally, Chang Haonan actually wanted Song Wencong to talk about this matter, but the latter said that it was Chang Haonan's intention to leave this part of the work to Guihang and not to take advantage of others.

This led to the seemingly random sentence just now.

For a project like Project 10, which involves many systems and departments, except for the core leadership members, many people are not familiar with each other at all.

This is especially true for people like Sun Huizhong who joined midway.

If integration into the team is not smooth, it is easy to appear like an outsider here to pick peaches.

For example, when the production of JJ-7 was handed over to Guihang, it was not without objections.

After all, Rong Fei himself was so poor at that time that he was about to lose his pants.

It would be much better now to be casually mentioned like this in the middle of a technical seminar.

After all, if we hold another non-nutritious meeting just for this matter, it will become a burden for everyone.

After introducing Sun Huizhong's situation to everyone, Chang Haonan quickly returned to the topic:

"The results of the actual installation test of the DSI inlet are finally reflected in the JJ-9 advanced trainer aircraft that has been finalized and has been sold domestically and exported almost simultaneously. The data collected during the test flight of this model will be used On the follow-up research and development of Project No. ."

"According to the current test flight and extended data calculation results, when the DSI inlet flow Mach number is 1.2 and below, the pressure coefficient on the lip bulge surface is symmetrically distributed along the center line of the bulge, with obvious pressure gradients, and at different times The cross-section has the characteristic of increasing along the main flow direction, and the bulge configuration has a significantly stronger effect on boundary layer sweeping than the current binary adjustable inlet."

"After Mach number 1.4 is exceeded, the ability to clean the boundary layer on the bulge surface will decrease sharply, and the separation of the boundary layer will be strengthened, which will cause greater intake pressure loss and distortion. It is expected that after the use of the vortex generator, the This obvious inflection point extends beyond Mach 1.8."

"Of course, the specific design details still need to be determined by the comrades responsible for the air intake design based on the actual situation. However, I already have a relatively mature design method here, so I don't have to start from scratch."

As soon as these words were spoken, there were several faint, slightly thankful exclamations coming from below.

Obviously, the intensity and difficulty of such work are much lower than their previous expectations.

"However, considering that there are already heavy-duty aircraft and special interceptor aircraft in the future air force equipment sequence, the J-10 does not need to undertake high-speed interception tasks, and under common combat loads, it is difficult for the aircraft to reach speeds above Mach 1.8. Therefore, such performance calibration is no problem for a single-engine medium-sized aircraft.”

Speaking of this, Chang Haonan also paused slightly.

On the one hand, it allows everyone below to absorb the content. On the other hand, it also takes the opportunity to drink water and turn the PPT to the next page.

It's still the same plane, but the view has been switched to the belly part.

"It can be seen from the first schematic diagram that the three-dimensional dimensions of the new design have basically remained the same, but the cross-sectional shape of the aircraft has undergone relatively large changes. Although this has increased a certain amount of resistance, it has also improved the The area of ​​the belly part of the aircraft, and the internal volume of the aircraft body.”

"In the original design, the aircraft only had a total of seven main hardpoints, of which only four could carry weapons and ammunition. Although composite pylons can be used to increase the loading capacity, it will still limit the multi-purpose performance of the aircraft."

"After modification, the original belly centerline pylon can be divided into two, the fuel supply system here can be canceled and replaced with electrical wiring. If necessary, the air inlet between the main and auxiliary landing gear can even be installed. On the side edges, two more light-load racks are added specifically for air-to-air ammunition.”

PPT is indeed a good thing. It allows Chang Haonan, who is not good at drawing, to no longer pollute his and other people's eyes with chalk and blackboard.

With just a click of the mouse, the new pylon arrangement is displayed on the bottom view of the aircraft.

"Mr. Chang."

Taking advantage of this opportunity, an engineer sitting in the first row below raised his hand and asked:

"Two medium-range air-to-air bombs, plus the corresponding pylons, weigh about 400-450kg. Will adding such a weight to the side edge of the front half of the inlet affect the strength of the lip?"

His concerns were clearly justified.

After all, in the existing design, the main function of the six sticks connecting the air inlet and the body is to strengthen the structure...

"This issue was considered at the beginning of the project planning. At first, we planned to carry out additional reinforcements at the joints, but later we found that the DSI air intake itself can reduce the mass of nearly 300kg compared to the binary adjustable air intake. Therefore, It won’t make that big a difference if you come back and forth.”

"The part that really needs to be properly handled by the comrades involved in the structural design is how to arrange the electrical circuits required for the two hangers in the outer wall of the air inlet..."

"That is to say...the belly part of the fuselage is not going to be used to arrange the auxiliary fuel tanks?"

"Yes."

Chang Haonan nodded directly:

"The original planned auxiliary fuel tank in the belly of the fuselage is only 900 liters. After modifying the fuselage, the fuel volume in the fuselage is expected to be increased by about 1100 liters, which can completely cover the 900 liters of fuel in the belly auxiliary fuel tank."

"This leaves the prime position between the two landing gears, which can completely mount two air-to-surface weapons that are relatively large in size and weight."

“Placing large mounts closest to the centerline of the aircraft, compared to arranging them under the wings according to the conventional plan, although the total weight does not change, the moment of inertia of the aircraft is smaller, so it can maintain higher maneuverability. "

At this point, those who reacted quickly have basically understood what Chang Haonan meant.

"Comrade Haonan means to transform our Project No. 10 into a multi-purpose fighter that can be compatible with various types of missions..."

Yang Wei looked at the design plan projected on the screen and pointed out the key points.

It’s not just the application of a certain technology.

It's a change in thinking.

"Yes, a true multi-role fighter."

Chang Haonan immediately expressed his affirmation and then began to describe his overall thoughts:

"Although technically speaking, the current J-10 is fully capable of this, but from the overall layout, it is not suitable for performing tasks such as battlefield interdiction or outside air strikes."

"Of course, considering the current struggle situation we are facing, a medium-sized aircraft that is biased toward pure air superiority and focuses on agility does indeed meet the needs of the aviation force."

"However, with the continuous development and progress of our People's Air Force, it is actually just around the corner to transform from a purely homeland defensive force to an offensive and defensive air force, or even an offensive air force."

"An aircraft with limited range and mounting capacity will definitely find it difficult to adapt to the increasingly complex combat scenarios of the People's Air Force in the future. The vitality of a model of aircraft depends to a large extent on the extent to which its basic design can to meet the needs of users.”

"That's why I came up with such a preliminary plan. I hope that the Project 10 can truly become an all-round model with no obvious shortcomings in the size of a medium-sized aircraft!"

In fact, from the beginning when he participated in Project 16, his goal was to make this aircraft surpass the F in all aspects, not just in air combat performance.

However, before the performance of the turbofan 10 is truly determined, this matter is indeed difficult.

So he never stated this goal.

The J-10 in the previous generation was chosen due to limitations in technology (the weight was already too large and the engine thrust was not enough) and vision (no one could have imagined that the Air Force would have thousands of third/fourth generation aircraft in more than ten years). It adopts a single-function technical route that is partial to short-term advantages.

But the problem is, excluding the special scenario of carrier-based aircraft, medium-sized aircraft cannot beat heavy-duty aircraft of the same technical level in any way except cost.

Therefore, whether it is the F16 or the J-10, the "light" part of the light-heavy combination will eventually tend to do the dirty work (licking the ground).

However, when the Air Force actually used the original J-10 to do odd jobs, it found that it seemed not suitable for dirty work...

There have even been famous scenes of using asymmetric mounts, with air weapons on one side and air ammunition on the other side.

Although it is not impossible to use, it is very awkward to use.

Nowadays, the more powerful turbofan 10B has emerged, which can naturally solve this problem without any worries, thereby creating a true hexagonal warrior!