Chapter 988 Meeting an opponent in chess

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

It’s not that he was worried about the result of Yan Zhongcheng battling with the opponent so he had to go on the field himself.

Mainly to satisfy curiosity.

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

It is not clear what this key model, which connects the past and the future, looks like now.

And since the Navy has already proposed the idea of ​​"continuing to improve the 052C", the updated 052D should at least have an overall plan.

Considering that the power of two QC300s is 25000% more than that of two GT20s, this model is likely to choose a more radical design.

Of course, given Chang Haonan’s current position, if he specifically sent a letter to ask, he would definitely get a response.

But if we mobilize so many troops just for such a thing, it seems a bit not worth it...

However, interest is interest.

Since the Navy Equipment Department specially held such a meeting before the formal selection and only invited technical personnel at the institute level to participate, it is obvious that it wants to reduce the non-technical impact of the top leaders of the two major military industrial systems on the selection results to a certain extent.

As the chief designer of WS-10, Chang Haonan is a special case, but he can also be interpreted as a technician.

But this is breaking the rules of the game -

The Aviation Power Group has sent a leader, so in order to be equal, does the Shipbuilding Heavy Industry Group also have to send a leader?

Once you two sit there, the Navy Equipment Department will feel a little overwhelmed. Do the heads of the General Assembly and the Navy also have to be present?

Then what is the point of holding a symposium?

Just make the selection in advance...

Therefore, Chang Haonan finally suppressed his eagerness to try.

……

The symposium was scheduled for three days later, on February 2.

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

The leading roles are played by the 606th Institute of Aero-Power and the 703rd Institute of Shipbuilding and Heavy Industry.

However, the other research institutes that were invited are not just supporting roles.

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

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

Of course, not every one of these involves a selection issue.

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

As for private enterprises...

As for private enterprises in the early 21st century, there was no need to even expect anything.

In fact, according to the original plan, there should only be one option for the gas turbine.

You should know that China came into contact with UGT90 from Ermao in the early 25000s, and a few years later decided to use it as the power system of 052B/C and localize it.

By 2002, the project had been progressing on an orderly basis for about five or six years.

However, a competitor that no one expected suddenly appeared halfway.

When Chang Haonan founded the Aviation Power Group, he said that he wanted to develop a 30-megawatt-class aviation-derivative gas turbine. This is something everyone knows.

But the problem is, if you want to convert aviation to fuel, you must first have aviation.

The general estimate in the industry at that time was that the WS-10 would probably complete dual finalization around 2005.

After that, it stabilized for a period of time, and then the project of developing aviation-derivative fuel engines was launched. It took until the fuel engines were finalized, which was at least after 2010.

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

As a result, even Chang Haonan did not expect that the production of WS-10 would be so smooth that he could start considering the design of QC2002 in early 300...

This immediately disrupted the Navy's previous equipment update plan.

For the 25000 Institute, which has already done extensive research on GT703, this matter is even more outrageous.

While eating hotpot and singing songs, the project that I had just obtained was suddenly snatched away by someone else.

How can I bear this?

Therefore, when the symposium came to the topic of gas turbines, Wen Xueyou, the chief engineer in charge of GT703 at the 25000 Institute, directly brought out the results of his work over the years...

"I believe that the naval comrades are already very familiar with the performance of the UGT25000 prototype. I will only give a brief introduction here. It has been tested on the Type 052B 168 ship, and its performance is in full compliance with expectations. The Type 052C, which 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 obtained 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 millennium.

After a brief background introduction, Wen Xueyou quickly got to the point of today:

"What I want to emphasize next is that while we are localizing the GT25000, we are also improving and upgrading it."

"First, as early as the late 90s, our institute built a zero-dimensional full-machine model and a two-dimensional component-level model of the GT25000, and on this basis conducted theoretical research on the feasibility of adding an indirect cooling and heat recovery system."

"Afterwards, we also carried out indirect cooling and heat recovery modification on a 401A gas turbine based on the research results and completed the preliminary scheme demonstration as a technology verification machine."

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

"..."

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

As for using their experience in marine power to develop a prototype as early as possible, it is even more of a natural thing to do.

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

This made him feel a little worried.

However, Jacky Wen quickly adjusted his mentality.

Because there is another "trump card" behind it.

He turned to the next page of the PPT.

Above is the title of the second part:

Adaptive handling receiver.

"On the other hand, compared with aircraft engines, marine gas engines pursue higher design operating efficiency while requiring better stability at non-design speeds. Therefore, while ensuring high efficiency at high speeds, the actual operating stability at lower operating conditions should also be specially considered."

After a short pause, Wen Xueyou continued to introduce:

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

“This design can balance 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 the stability by 2%, and when the compressor stall type changes to a sudden stall, the expansion effect can reach 6%. Overall, the average thermal efficiency of the turbine under conditions below 50% speed can be increased by 3.5%, while the efficiency at the design point is only reduced by 0.23%, which has almost no adverse effects..."

Yan Zhongcheng listened quietly to Wen Xueyou's introduction, his expression gradually becoming amused.

The other party just specifically mentioned the difference between marine gas engines and aircraft engines, apparently to emphasize their own lack of experience in the field of marine power.

Of course, it must be admitted that this adaptive receiver technology is indeed quite ingenious.

With relatively low cost, the high and low speed performance of the gas turbine is taken into account.

This solves a huge pain point of gas turbine power.

If I had attended the meeting earlier, I might not have been able to 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...