Chapter 1226 The British Gas Turbine Is Going to Have Problems

Chang Haonan was greeted by a silence.

Ren Bingda didn't even understand the question, let alone answer it.

After a long while, he continued to speak tentatively:

"In fact, before I came here, I specifically asked the comrades in the technical department. They said that the British's statement is correct in principle. When the temperature difference of the heat exchange gas is small and the specific heat capacity of the heat exchange medium is not large enough, the intercooler does not play a practical role..."

As the second-in-command of Gaofa Group, Ren Bingda has been away from the front-line R&D work for some years. Many new or professional problems can only be consulted by others.

But many things are difficult to explain without the specific background.

Chang Haonan scratched his head and organized his words for a while with a twisted face:

"If you only look at the principle, it is indeed what they said... When I first introduced the intercooler into the turbofan engine model in a simple simulation method, the effect was to increase the fuel consumption by 1.5% in exchange for a 2% thrust increase, which is basically dispensable."

"But if you really analyze the actual situation in depth, the existence of the intercooler will reduce the inlet temperature of the high-pressure compressor, reduce the tip temperature of the rear stage of the high-pressure compressor to a certain extent, and reduce the material load... At the same time, the compression of low-temperature gas will be easier, and the pressure ratio of the high-pressure compressor will be improved, which is beneficial to the performance of the engine..."

Halfway through the explanation, Chang Haonan's voice suddenly paused.

"Wait..."

He first narrowed his eyes, and then his face showed an expression of serious thinking:

"Could it be..."

Seeing his appearance, Ren Bingda didn't want to interrupt him, so he had to sit down next to him for the time being.

After a few minutes, Chang Haonan's brows relaxed slightly.

Then he immediately grabbed the telephone receiver on the table and quickly dialed the number of Yan Zhongcheng, the chief designer of the 606th Institute.

A familiar voice soon sounded over there:

"Hello?"

I haven't seen Yan Zhongcheng for more than a year, and his voice seems much older.

Apparently, as the chief designer, he was under a lot of pressure during the period when the QC300 was just shipped.

"Academician Yan? I'm Chang Haonan."

"Academician Chang?"

The other party was a little surprised.

After all, this is a number displayed as Gaojing:

"Any instructions?"

"Not instructions..."

Chang Haonan got straight to the point:

"I want to ask, in the process of developing QC300, our 606th Institute should have collected relevant information on similar products from other countries through various channels, right?"

"Of course."

Although there was doubt in his tone, Yan Zhongcheng quickly answered.

"Then please Academician Yan, sort out the information about the Rolls-Royce WR21 and MT30 models, and send them to me. I need them urgently."

"Okay, I'll do it as soon as possible."

"..."

It was not until he hung up the phone that Ren Bingda stood up again and came to the other side:

"Academician Chang, are you preparing to..."

Everyone around him knew that the two core tasks that Chang Haonan was directly responsible for were high bypass ratio aircraft engines and hypersonic weapons, and he didn't ask too much about marine engines.

Now that he suddenly made such a call, Ren Bingda was inevitably puzzled.

And a little worried.

Although the Gaofa Group has developed well in recent years, it still lacks the experience of fully developing an aircraft engine model.

It still relies heavily on strong foreign aid.

Chang Haonan took a deep breath and calmed down a little:

"What you just said suddenly gave me a guess."

He explained:

"Logically speaking, the effect of the intercooling and reheating system on the aircraft engine should be easy to find if an actual cycle test is carried out... or even if a correct and complete numerical simulation is done."

"But the British now act as if they know nothing about it. I even suspect that they don't know that they are being tricked, which is equivalent to being completely unaware of the influencing factors I just mentioned. This shows that Rolls-Royce's understanding of the intercooling cycle is likely to be wrong from the root... at least imperfect."

Ren Bingda raised his head slightly, recalling the scene when he talked with the two British people from Xiluo Company.

He didn't feel it when he was at the scene, but now after such a little guidance, he found that the other party seemed to be a little confused...

"It seems to be true... But haven't they done any research in this area? It's natural that they don't know, right?"

Chang Haonan waved his hand:

"For example, the problem of too small working temperature difference of the intercooler should be considered even in the field of gas turbines... Although the working environment of marine power is relatively stable and rarely faces such harsh and changeable conditions as aero engines, in some specific situations, such as when the ambient temperature is particularly high and the working point of the gas turbine is close to the limit, the spontaneous intercooling cycle may still be broken."

"Although the British have not made such attempts in the field of aero engines, they have developed two marine gas turbine models with intercooling and heat recovery systems, WR21 and MT30, from the end of the last century to now. It's a bit..."

Before he finished speaking, the computer sounded a new email notification.

It was obviously Yan Zhongcheng who sent the information.

Huaxia is not a big brother, and there is no way for Daiying to be transparent about his one-way intelligence, so these materials are basically public or semi-public content collected and analyzed.

You can send it via internal email.

Chang Haonan quickly downloaded and opened it.

QC300 itself uses an intercooling cycle, so the benchmarking focus during the pre-research process is WR21 and MT30, and the amount of relevant data is also amazing.

But he was lucky and quickly found the part he wanted.

The specific test projects of the two models are of course secret, but the distribution of key time nodes and the action trajectory of the water trial platform are public.

It is not difficult to analyze some clues from it.

After more than ten minutes, Chang Haonan raised his head again...

…

In fact, the failure of the WR21 gas turbine, which caused the Type 45 destroyer to lie down for a long time, was a bad thing known to the whole world in the previous life.

However, the reason given by the British Navy all the time is that the problem lies in the integrated power management system of the Type 45 destroyer.

This system abandons the traditional reduction gearbox, uses all the mechanical energy output by the gas turbine and diesel engine to generate electricity, and then uses a computer system to accurately distribute the electrical energy to the drive motor and shipboard electrical equipment.

However, due to an error in the control logic, when the WR21 suffers from thermal power attenuation, the countermeasure is not to automatically reduce the output power of the propulsion motor, but to forcibly increase the power generation of the diesel engine to meet the power requirements.

The result is that the diesel engine cannot handle it first and shuts down, and then the system in turn continues to forcibly increase the power of the gas turbine, and then uses the same method to collapse the gas turbine.

This is a pretty low-level engineering design error, but it makes perfect sense when explained.

After all, Dai Ying in his previous life had almost completely de-industrialized after entering the 21st century, and it didn't seem surprising that he was doing any kind of bad work.

But Chang Haonan was not sure whether Luo Luo and BAE, who were being whipped forward by him with a small whip, would make the same mistake again after the timeline had undergone huge changes.

Therefore, he has not considered this matter as part of his plan.

But today, Chang Haonan finally realized it.

This power system problem that has plagued a total of 11 ships of Type 45, Zumwalt and Queen Elizabeth III is not at all due to a comprehensive power system failure.

But there is a big problem with the gas turbine itself——

Loop parameters are related to the core hardware. Once an error occurs, it cannot be solved by patchwork.

The entire design had to be rebuilt from scratch.

No wonder it took the British nearly 15 years to barely complete the overhaul of all six Type 45 ships.

As for the two Queen-class aircraft carriers, they simply gave up treatment.

How could it have taken so long if the control logic was just wrong?

In an instant, all his thoughts became smoother.

"I guess..."

After saying these three words, Chang Haonan paused for a moment.

Then his tone suddenly became very determined:

"No, I'm sure of that."

"Both types of gas turbines designed by Rolls-Royce have very serious fault risks!"

For such a sudden change in the plot, Ren Bingda couldn't keep up with the rhythm for a while.

But he could still understand Chang Haonan's conclusion.

Not only can I understand it, but I also feel familiar.

Because more than two years ago, a hidden fault on the Trent 900 was also analyzed by Chang Haonan through guessing from afar.

"You mean... we can use this matter as a bargaining chip to gain an advantage in negotiations?"

"no."

Unexpectedly, this time, Chang Haonan rejected the proposal almost without hesitation.

"But that time with the Trent 900..."

Ren Bingda was still a little unwilling.

Giving lessons to a group of British engineers at the Rolls-Royce headquarters was the highlight of his life.

Naturally I want to reproduce it again.

"We are also involved in the development of the Trent 900, which means that if something goes wrong, everyone will suffer losses, and we may also take the blame, so I have to remind the British in advance."

Chang Haonan replied:

"Rolls-Royce's gas turbines have nothing to do with us, and it seems that the first Type 45 destroyer equipped with WR21 has just been launched, and we can't wait until the British can verify this problem, so it is better to wait until the problem is concentrated and it is difficult to recover. Let’s fall into a trap again…and lend a helping hand again!”