Chapter 1226 The British gas turbine is going to have problems
What greeted Chang Haonan was silence.
Let alone the answer, Ren Bingda actually didn't even understand the question.
After a while, he tentatively continued:
"Actually, before I came here, I specifically asked the comrades at the technical office. They said that the British 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 is indeed It cannot play a practical role..."
As the second-in-command of Haofa Group, Ren Bingda has been away from front-line research and development work for some years. For many novel or professional questions, he can only consult others.
But many things are difficult to explain clearly without specific context.
Chang Haonan scratched his head and organized his words for a while with a troubled face:
"If you just look at the principle, it is indeed what they said... When I first introduced the intercooler into the turbofan engine model using a simple simulation method, the effect was to increase fuel consumption by 1.5% in exchange for 2% thrust. Promotion is basically optional. ”
“But if we 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 also It will be easier to carry out, and the pressure ratio of the high-pressure compressor will be increased, which will be beneficial to the performance of the engine..."
Halfway through the explanation, Chang Haonan's voice suddenly stopped.
"Wait..."
He narrowed his eyes first, and then showed a serious thinking expression on his face:
"Could it be that..."
Seeing his appearance, Ren Bingda didn't want to disturb 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 phone receiver on the table and quickly dialed the number of Yan Zhongcheng, the chief engineer of the 606 Institute.
A familiar voice soon sounded over there:
"Hello?"
I haven't seen him for more than a year, and Yan Zhongcheng's voice seems much older.
Obviously, during the period when the QC300 was just shipped, as the chief engineer, he was under a lot of pressure.
"Academician Yan? I am Chang Haonan."
"Academician Chang?"
The other person looked a little surprised.
After all this is a number that appears as Ho-kyung:
"Any instructions?"
"Instructions are out of the question..."
Chang Haonan gets straight to the point:
"I would like to ask, in the process of developing QC300, our 606 office should have collected relevant information about similar products from other countries through various channels, right?"
"This is natural."
Although there was doubt in his tone, Yan Zhongcheng answered quickly.
"Then please, Academician Yan, sort out the information on Rolls-Royce WR21 and MT30, and then send it to me. It's urgent."
"Okay, I'll do it as soon as possible."
"..."
It wasn't until he hung up the phone that Ren Bingda got up again and came to the opposite side:
"Academician Chang, are you preparing..."
Everyone around him knows that Chang Haonan is currently directly responsible for the two core tasks of high-bypass-ratio aviation engines and hypersonic weapons, and does not care too much about marine gas turbines.
Now such a call was made suddenly, which inevitably made Ren Bingda a little confused.
And a faint worry.
Although Haofa Group has developed well in recent years, it still lacks the experience to fully develop an aircraft engine model.
Still relies heavily on strong foreign aid.
Chang Haonan took a deep breath and calmed down a little:
"What you just said made me suddenly have a guess."
He explained:
"Logically speaking, the effects of the intercooled recuperation system on aeroengines should be easily discovered if actual cycle tests are conducted...or even if correct and complete numerical simulations are conducted."
"But the British now act like they don't know anything about it. I even suspect that they don't know that they have been tricked in reverse. This is equivalent to being completely unaware of the influencing factors I just mentioned, which shows that Luo Luo's understanding of the intercooling cycle is very likely to be fundamentally wrong...at least imperfect."
Ren Bingda raised his head slightly and recalled the scene when he was talking to the two British men from Xiro Company.
He didn't feel it when he was at the scene, but now after some digging, he found that the other party did seem to be a bit unclear...
"It seems true... but haven't they never conducted research in this area before? It's natural that they don't know, right?"
Chang Haonan waved his hand:
"Problems such as the working temperature difference of the intercooler being too small 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 aviation engines, in the In some specific circumstances, such as when the ambient temperature is extremely high and the operating 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 aviation, they have developed two marine gas turbine models with intercooled heat recovery systems, WR21 and MT30, from the end of the last century to now. More than ten years have passed and there are still no Knowing these details is a bit..."
Before he finished speaking, the computer sounded a notification that a new email had been received.
Apparently Yan Zhongcheng 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 the 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 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!”
(End of chapter)