Chapter 986 Ship Gas Turbine

Liu Chenchen had the key to Chang Haonan's office, but he certainly couldn't let anyone in casually.

Therefore, when the latter returned upstairs, Yan Zhongcheng was waiting in the corridor, holding a cotton hat in his hand and fanning himself with the ear protection part.

He looks like an ordinary old man from the Northeast.

"Mr. Yan, why didn't you contact me in advance when you came here? I'd better be prepared."

Chang Haonan said as he took out the key and opened the door.

In fact, his main feeling about Yan Zhongcheng's arrival was that of surprise.

Especially when the other party went directly to the Torch Laboratory.

But no matter what, the two have been in a relationship for so many years, so they are definitely welcome.

"I am also in Beijing for a meeting, and I thought I would stop by to see Mr. Chang..."

"Meeting?"

Chang Haonan stopped opening the tea box:

"Isn't it a little early?"

In the late winter and early spring, when the meeting came to Beijing for a meeting, Chang Haonan naturally thought it was a national conference.

But that should only start in mid-March.

"It's not that one..."

Yan Zhongcheng quickly denied:

"It was a symposium held by the Naval Equipment Department. We went to several institutes including our 606 Institute and the 703 Institute of Shipbuilding Industry."

Although the theme of the meeting was not mentioned directly, there is basically only one possibility to put Institute 606 and Institute 703 together:

"New naval gas turbine?"

Chang Haonan frowned:

"But...the group level has not received any news about the start of model selection?"

The gas turbines being selected at the moment are definitely for new destroyers, and there is a high probability that they will be the main model in the next twenty years or even longer.

In fact, the reason why he planned to build a 30-megawatt turbofan 10 aerospace engine early that year was to target this demand.

Now that the production of the turbofan 10 has been completed, the establishment of the QC300 project should indeed be put on the agenda.

But no matter what, it is impossible for such a big matter to be settled between the Naval Equipment Department and several secondary research institutes.

It must involve the General Armament Department and the group level.

But he heard nothing about it.

"Oh...it's not yet time to officially start the selection process."

Yan Zhongcheng explained:

"Haizhuang didn't say it clearly, but I guess... this time it's just a matter of getting a feel for it in advance so that the higher-up leaders can have an idea."

Chang Haonan held two cups, sat on another sofa next to Yan Zhongcheng, and gave the cup with tea to the latter:

"Other institutes have nothing to say. They probably don't have any competitive products on hand."

"There are only 703 schools... they should be working on the domestically produced UGT25000 now?"

Yan Zhongcheng took the tea cup, his expression and movements seemed a bit reluctant -

For him, the situation was a bit embarrassing after Chang Haonan took office as the chief planner of the Aerospace Power Group.

It's equivalent to his former subordinates now becoming superiors.

Supposedly, this situation is actually not particularly rare.

And when he was working on the August 3rd Project, Yan Zhongcheng had guessed that this day would come sooner or later.

The problem is, Chang Haonan's reversal was too early...

There was no time to adapt.

Of course, this is human nature.

Chang Haonan can also understand.

But precisely because he could understand, he roughly guessed from just now that the other party came to visit him specially today, and it was definitely not just a drop-in.

Now it seems that is indeed the case.

"right."

Yan Zhongcheng nodded:

"There have been rumors that this symposium will affect not only the selection of ship gas turbine models, but also the subsequent development route of the entire domestic destroyer."

"052C?"

Chang Haonan asked almost subconsciously, but in an instant he realized that the time was not right:

"No...the first two ships of 052C are about to be launched..."

"That's the new and improved model from the future..."

The model demonstration of 052B/C has been completed as early as 1993, and now, eight units are used on the four ships 168-171, plus two units as backup, a total of ten UGT25000 units have been used. All were shipped to China.

In any case, the design of these two models is unlikely to change.

Therefore, the influence route mentioned by Yan Zhongcheng can only be the updated 052D.

However, due to some influence from Chang Haonan, the current design of 052C in this timeline actually has a lot of shadows of the previous 052D, such as the more versatile common frame vertical hair, and skipping air cooling directly. Water-cooled 346 radar.

Of course, there are also hangars and helicopter decks that have become longer to accommodate the Z-12 helicopter.

So it’s hard to guess what 052D will look like in this life.

"Although the 052C has not yet been launched, the combat system has been fully verified on the Bi Sheng. The 052B using the same power and hull design is also undergoing trial trials. The Navy is generally very satisfied with the performance of this combination..."

Having said this, Yan Zhongcheng took a sip of water before continuing:

"So, whether the 052C will be mass-produced directly, or just two ships will be built like the previous models, as a verification of the regional air defense system, and then a newer model with stronger combat effectiveness will be developed. There is no conclusion yet."

"The hull of 052B/C, especially the compartment distribution, is designed using UGT25000. If 052C is mass-produced, UGT25000 must be fully localized."

"Now the 703 Institute has actually pushed the localization rate to almost 75%. Basically, most wearing parts no longer need to be imported. It is a low-risk, low-cost, short-term and fast option."

"However, some people believe that the UGT25000 was not originally designed as a power gas turbine. Although the power is sufficient, it cannot be compared with similar models in terms of fuel consumption, vibration, failure rate or size, and is not suitable for long-term use as the main model in my country... …”

"I came here today just to ask Mr. Chang your opinion on this matter..."

After hearing this, Chang Haonan finally understood.

Both the shipbuilding industry system and the aviation industry system currently have gas turbine research and development capabilities, but the logistics needs of the military determine that it is impossible to be equal in selection.

It can be regarded as another version of the sea-air gas turbine dispute.

In the original timeline, Turbofan 10 itself did not mature until after 2010, so this competition ended almost before it started——

As the only option available, the domestically produced GT25000 from the 703 institute won without any doubt.

But now, the fate of Turbofan 10 is completely different.

Although compared to GT25000, QC300 has not yet been formally approved as a project, and even specific technical indicators have not yet been released.

But seeing that the little brother in the Air Force next door is now eating with a mouth full of oil, the Navy, as the second brother, has to consider a more tempting option.

That is to be greedy again.

Anyway, the military struggle situation has eased to a certain extent in recent years.

It seems that it is possible to achieve more advanced gas turbines in one step.

In this way, it can also be compatible with larger capital ships that may exist in the future, as well as other gas turbine-powered auxiliary ships.

Yan Zhongcheng was undoubtedly here to ask for advice.

"Mr. Yan, you should have seen the detailed technical specifications of the turbofan 10 core machine, right?"

Chang Haonan did not directly give a countermeasure, but asked a seemingly irrelevant question.

"Of course."

Yan Zhongcheng replied without hesitation:

"After the QC130 was finalized, I was actually considering aeroderivative combustion based on the Turbofan 10, but at that time, whether it was the group or the 606 institute, all resources were concentrated on the Turbofan 10 itself..."

"That's fine, as long as you have a clear understanding of the situation of Turbofan 10."

Chang Haonan waved his hand and interrupted the other party:

"Compared with the 703 institute, our solution has an absolute advantage in terms of technical indicators."

"Even according to the most conservative estimate, the QC300 can fully compete with the LM2500+ just installed by the US military, which is a rated power of 30 megawatts, a fuel consumption of 0.21kg/(kW·h), and a simple cycle efficiency of between 38-40 , and a total weight of 5.5 tons...or less."

“Especially the last item, even if the hull design itself does not undergo major changes, a lighter and smaller gas turbine can leave more internal space, and the burden on the turbine department will be lower.”

"In addition, due to the smaller size of the QC300, even if an intercooling and heat recovery system is added, it will not put too much pressure on the cabin."

The so-called intercooling recuperation is to add an intercooler between the low and high pressure compressors and add a recuperator at the exhaust port.

The intercooler reduces the temperature of the air entering the high-pressure compressor, thereby reducing the compression power consumption of the high-pressure compressor.

The regenerator allows the compressed air to absorb the heat in the exhaust gas, thereby reducing the amount of heat that needs to be added to the combustion chamber.

At the same time, the intercooler can also correspondingly reduce the outlet temperature of the high-pressure compressor, thereby increasing the temperature difference between the fluids on both sides of the regenerator and further improving the heat exchange efficiency of the regenerator itself.

Thereby significantly improving thermal efficiency.

For the QC300, which can achieve a thermal efficiency of 39% in a simple cycle, if it is changed to an intercooling and heat recovery cycle, it is not an exaggeration to increase the efficiency to about 45% under ideal working conditions.

Yan Zhongcheng also smiled after hearing this:

"If you say that, Mr. Chang, then I'll feel relieved..."

"We don't even have drawings for our QC300 now. If I tell you in vain, the Navy will inevitably have concerns... But if I say this is the news revealed by you, Mr. Chang, then the persuasiveness will be different..."

Chang Haonan almost couldn't hold his nerve——

Compared to asking questions, this wave seems to be closer to seeking endorsements.

Fortunately, the results are similar.

"Ahem——"

He cleared his throat:

"Don't be too aggressive when the time comes. After all, the overall design of the ship is still completed by the shipbuilding industry. In any case, cooperation will be inevitable in the future. It is not good if the relationship becomes tense..."

"In addition, in the process of developing QC300, we can consider cooperating with the 703 Institute."

"First of all, we can't take all the benefits... Secondly, the ship's power system does not only include gas turbines. After all, the other party is a research institute of the shipbuilding industry and has much more experience in ship-fuel cooperation than we do..."