Chapter 988 A Match Made in Heaven

In fact, Chang Haonan was also a little interested in this symposium.

It's not that he was worried about the outcome of Yan Zhongcheng's battle with the opponent, so he had to play in person.

Mainly just to satisfy curiosity.

Before, he had only learned about the current general situation of 052C from a few words from Lin Qing and Wang Xiaomo.

It’s not clear what this key model, which was the link between past and present, looks like now.

And since the Navy has put forward the idea of ​​"continuing to improve the 052C", the updated 052D should at least have a master plan.

Considering that the power of two QC300s is 20% more than that of two GT25000s, this model is likely to choose a more radical design solution.

Of course, with Chang Haonan's current position, if he specially sent a letter to ask, he would definitely get a response.

But if we work hard just for such a thing, it seems a bit unworthy...

However, interested is interested.

Since the Naval Equipment Department specially held such a meeting before the official selection, and only invited technical personnel at the institute level to participate, it was obviously intended to reduce to a certain extent the concerns of the top brass of the two major military industry systems about the selection results. non-technical impact.

As the chief designer of Turbofan 10, Chang Haonan is in a special situation and can of course be interpreted as a technician.

But this is breaking the rules of the game——

The Aviation Power Group has sent a leader, so for the sake of reciprocity, does the Shipbuilding Industry Group of another company also have to send a leader?

Once the two of you sit there, the Naval Equipment Department will be a little overwhelmed. So do the general assembly and navy chiefs also need to be present?

What kind of symposium is there?

Just make the selection in advance...

Therefore, Chang Haonan finally suppressed his eagerness to try.

…

The symposium is scheduled for February 26, three days later.

The situation was similar to what Chang Haonan had estimated before.

The leading roles are the Aviation Power Institute 606 and the Shipbuilding Industry Institute 703.

However, the other research institutes invited were not entirely foils.

Because the theme of this symposium is strictly speaking "Development of Ship Power System".

In addition to the core gas turbine, gearboxes, propulsion systems, cruise diesel engines, power generation auxiliary engines, etc. were also included in the discussion.

Of course, not every one of these involves selection issues.

At present, China's scientific research resources are still relatively limited, and it is impossible to afford free competition among multiple parties in all fields.

As for private enterprises...

For private enterprises in the early 21st century, there is no need to count on that.

In fact, according to the original plan, even the gas turbine should have only one option.

You know, China has been exposed to UGT25000 from Ermao since the early 1990s, and a few years later decided to use it as the power system of 052B/C and localize it.

By this time in 2002, this project had been progressing step by step for about five or six years.

However, a competitor appeared halfway through that no one expected -

At the founding meeting of the Aviation Power Group, Chang Haonan said that he would build a 30-megawatt aeroderivative gas turbine. This is something everyone knows.

But the problem is that to change aviation, you must first have aviation.

The common estimate in the industry at that time was that the Turbofan 10 would be completely finalized around 2005.

After that, it stabilized for a period of time, and then the project was initiated to develop an aeroderivative gas turbine. Then, after the gas turbine was finalized, it was not until 2010.

In other words, everyone feels that the high-power gas turbine of the Aerospace Power Group should be prepared for the next generation of brand new surface ships.

As a result, even Chang Haonan did not expect that the production and finalization of the turbofan 10 would be so smooth that he could start considering the design of the QC300 in early 2002...

This disrupted the Navy's previous equipment update plan.

For Institute 703, which has already studied GT25000 extensively, this matter is even more outrageous.

While eating hot pot and singing songs, the project I got was suddenly blocked.

How can I bear this?

Therefore, when the symposium came to the topic of gas turbines, Wen Xueyou, the chief engineer of the 703 Research Institute in charge of GT25000, directly presented the results of these years of visiting...

"I believe that comrades in the Navy are already very familiar with the performance of the UGT25000 prototype. I will only give a brief introduction here. It has currently been tested on the 052B Type 168 ship, and its performance is fully in line with expectations. The 052C type that has entered the equipment outfitting stage also uses this model..."

"..."

Compared with QC300, the main advantage of GT25000 is that the situation is known and can be taken almost immediately.

Thanks to the rapid progress of the overall level of China's machinery industry on this timeline, the latter's localization process has been almost smooth sailing since the turn of the millennium.

After a brief background introduction, Jacky Wen quickly entered the topic of today:

"The next thing I want to focus on is that while we are domesticating the GT25000, we are also improving and upgrading it."

"First, as early as the late 1990s, our institute built a zero-dimensional full-machine model and a two-dimensional component-level model of GT25000, and on this basis, conducted theoretical research on the feasibility of adding an intercooling and heat recovery system."

"After that, we also carried out intercooling and heat recovery transformation on a 401A gas turbine based on the research results, and completed the preliminary scheme demonstration as a technical verification machine."

"According to the test results, its thermal efficiency increased by about 3.8% compared with before the transformation, and the output power increased by about 5%..."

"..."

The development direction of marine gas turbines is visible and tangible, so it is expected that the 703 Institute also regards the intercooling and heat recovery system as a future upgrade route.

As for using their experience advantage in marine power to make a prototype one step ahead, it is even more logical.

Therefore, when Wen Xueyou finished introducing this part, he glanced at Yan Zhongcheng who was sitting below with the corner of his eye and found that the latter did not seem to show any emotional fluctuations.

This made him a little worried.

However, Wen Xueyou quickly adjusted his mentality.

Because there is another "trump card" behind.

He turned the PPT to the next page.

The title of the second part is above:

Adaptive processing casing.

"On the other hand, compared with aircraft engines, marine engines require better stability at non-design speeds while pursuing higher design operating efficiency. Therefore, while ensuring high efficiency at high speeds for marine engines, we should also specifically consider its actual operating stability under lower conditions."

After a short pause, Wen Xueyou continued to introduce:

"For this reason, we designed an adaptive processing casing while trying to maintain the commonality of core components. It has openings at the leading and trailing edges of the moving blades, connected in the middle by a bridge structure, and uses the pressure difference between the front and rear openings to make the airflow near the rear opening flow to the front opening, thereby changing the core of the blade tip clearance vortex and effectively weakening the generation of secondary flow of blade tip leakage..."

"This design It can take into account both compressor efficiency and stability margin, and is applicable to plugging stall and blade tip overload stall in tip stall, as well as modal stall. "

"According to simulation tests, when the compressor is in modal stall, the new adaptive casing can expand stability by 2%, and when the compressor stall type changes to tip stall, the expansion effect can reach 6%. Overall, the average thermal efficiency of the turbine under the condition of 50% speed can be increased by 3.5%, while the efficiency at the design point is only reduced by 0.23%, which will hardly have any adverse effects..."

Yan Zhongcheng listened quietly to Wen Xueyou's introduction below, and his face gradually became playful-

The other party just mentioned the difference between marine gas turbines and aircraft engines, obviously to emphasize his lack of experience in the field of marine power.

Of course, it must be admitted that this adaptive casing technology is indeed quite clever.

With a relatively small cost, it achieves both high and low speed performance of gas turbines.

It can be regarded as solving a huge pain point of gas turbine power.

If I had come to the meeting earlier, I might not have come up with any good solutions.

But now, the situation is different——

Three days ago, the multi-stage adjustable stator blade matching technology proposed by General Manager Chang seemed to have a similar but diametrically opposed meaning...