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

"DSI air intake?"

Although related concepts have been proposed a long time ago, they were obviously not very common in 1997, so Sun Huizhong thought for a while before searching for relevant knowledge in his mind:

"I remember...a few years ago, the United States built some kind of advanced compact air intake system. It seems that this is what they were studying?"

"Yes."

Chang Haonan nodded. In an era when information was not developed, it really impressed him that the other party knew this:

"Actually, I have already applied the central idea of ​​the DSI air intake in previous designs."

While speaking, he had drawn a cross-sectional schematic diagram of a DSI air inlet and a baffle air inlet on the blackboard:

"On the J-7F, I used the nose radome as a cone-shaped precursor instead of a complex partition to process the incoming flow once to prevent low-energy flow from entering the air intake, which greatly improved the air intake efficiency."

“But in fact, the standard semi-conical shape is not very precise in controlling the flow field, so a more complex fan-shaped lip design is still needed to improve the ability to exclude the boundary layer, which will bring great resistance. , on the other hand, it will increase the volume of the intake duct and add back the weight saved by eliminating the partition.”

Hearing this, another engineer next to him seemed to think of something:

"I have indeed seen a photo of the F16. Although it is a bit blurry and it is still black and white, the air intake is indeed similar to the one on the blackboard. The shape is quite exaggerated, a bit... a bit like the toad's mouth you mentioned before."

And Sun Huizhong's thinking is obviously more in-depth:

"So, the key to the design of this DSI air inlet lies in the shape of... this bulge near the lip?"

The following content was completely beyond the reach of Chang Haonan's painting skills, so he simply did not continue the meaningless attempt.

Fortunately, we are all professionals, so we can explain everything with words alone:

"Yes, the bulge compression surface of the DSI inlet is designed based on the waverider principle. Its basic shape is still a conical surface, but several tracking points need to be selected from the leading edge line, and these tracking points need to be selected in the flow field. The point begins to trace downstream of the flow field, and the flow surface formed by these traced streamlines is the bulge compression surface."

"Although this process is not difficult to describe, the numerical calculations involved are quite complicated. I also need to sort out my ideas, so I am not in a hurry for the time being. I will first complete the overall design according to my previous plan."

In fact, Chang Haonan's ideas are similar to his previous ideas for Turbofan 9. They are all researching certain key new technologies in advance for subsequent key models.

Last time it was for the Turbofan 10, and this time, it is undoubtedly for the J-10.

Since in this time and space, the J-8C has successfully completed the design and finalization and been delivered to the troops for trial, so for third-generation aircraft, especially single-engine medium-sized third-generation aircraft like the J-10, it has been possible to completely give up the pursuit of speeds above Mach 2.0. , and instead focus on optimizing overall performance at medium and low speeds.

Now that the No. 10 prototype of the J-01 has reached the final assembly process, it is naturally impossible to reinvent the wheel, but the new DSI air inlet design can still be used on subsequent full-state prototypes.

As long as his efficiency is high enough.

After all, the shape of the J-10's own air intake has undergone a major change.

On the full-size model in 1991, an air intake similar to that of the F16 was used.

When it came to the prototype stage, it was replaced with a two-dimensional adjustable inclined plate inlet that focused more on high-speed performance.

The previous Xiaolong only really used the DSI air intake design from the No. 04 prototype.

In addition, the design of Prototype 01 will not be wasted.

It can definitely be exported.

Just because China does not need the high-speed capability of the J-10 does not mean that other countries do not need it either.

Most countries have only one type of main fighter aircraft, and this model is needed to cover everything. Therefore, an old design with relatively good air intake efficiency in the full airspeed range would be more suitable.

……

Just when Chang Haonan was taking advantage of his limited time a year ago to conduct research on new aircraft and new designs in Chengdu, the 410 Factory in Shengjing welcomed a group of guests that the Chinese military industry had not seen for a long time——

Delegation from Persia.

At the head was Brigadier General Mark Welsh, chief of staff of the Persian Air Force.

Among the people responsible for reception, Zhong Shihong, who is responsible for technical work, is naturally indispensable.

In fact, during the Xiangzhou Air Show in early November last year, the Persians had already shown a strong interest in several models. The subsequent development did not exceed the expectations of the aviation technology group. They quickly received the information that the other party hoped to use in the military. request for cooperation in sales.

But no one expected that Persia first expressed interest in neither the J-8C nor the J-7F, but the Turbojet 14.

So under the leadership of Zhong Shihong, the Persian delegation spent about a day visiting the final assembly workshop and part of the production workshop of Factory 410——

Again, if the aviation engine could be built just by looking at it, China would not have been able to produce a stable turbofan 2010 until 10 in the previous life...

"Brigadier General Welsh, I wonder what kind of fighter jet you plan to use our aviation engine to adapt to?"

Zhong Shihong almost subconsciously thought that the other party was going to buy an engine.

As a factory owner, he does not need to think about "whether it can be sold". That is the task of the Science and Technology Commission and the Aviation Technology Group.

Moreover, although the Turbojet 14 is a top-notch aviation engine for China, if you really want to compare it on a global scale, it is actually not a particularly black technology that defies the sky. If someone really buys it, there is nothing it cannot sell.

In this era, China's military industry has not yet reached the level of being picky about its customers.

But he was obviously wrong.

After hearing the question through an interpreter, Welsh shook his head decisively:

"No, Mr. Zhong, we are not here to buy your engines. After all, to be honest, considering the current level of the aviation industry in Persia, it may be difficult to fully produce fighter jets."

"We want to entrust you with the overhaul business of a batch of turbofan engines."

When he first heard this answer, Zhong Shihong thought it was a mistake in the translation.

But he soon realized what the other party was talking about:

"Are you referring to the TF14 engines on your F30s?"

"Yes."

Welsh turned around, looked at several turbojet 14 engines being assembled in the factory and said:

"You should know that the combination of TF30 and F14 does not perform satisfactorily in terms of reliability. Although our pilots have been very careful when flying, failures such as engine surge often occur."

"Over the years, the spare parts previously purchased have been exhausted. After all, the number of parts obtained through special channels is limited, and the quality and quantity are unstable. The F14 is our main model, so we thought of seeking technical help."