Chapter 85: The Surge Position, You Can Calculate It!

After Yan Zhongzhong waved his hand to continue work, the people around him finally dispersed and returned to their work positions.

He then stood still and rested for about half a minute before finally recovering from the lack of blood supply he had just had.

"Whew-"

Yan Zhongzhong exhaled a long breath, then picked up the thermos cup next to him and poured a sip of strong tea fiercely, ready to follow his subordinates into the next stage of work.

The result is at this time.

With the sound of hurried footsteps, a figure rushed in from outside the office.

"I found it!"

Yan Zhongzhong, who had just recovered his strength, turned a little slowly, and stood in place for a few seconds before realizing that the person who was waving a few pieces of paper was Chang Haonan.

The others who were working were also attracted by this sudden sound.

"What did you find?"

Chang Haonan took two breaths before handing the calculation results in his hand to Yan Zhongzhong at the table:

"I calculated the first place where the flow separation could theoretically occur was on the blades of the second-stage rotor of the high-pressure compressor!"

！！！

After hearing this, the first reaction of most people in the room was to be confused-

Chang Haonan was not with them just now, nor did he take away the engine-related flight data, so he did not have the conditions for surge analysis at all?

"Figured it out?"

It was Yan Zhongzhong who reacted the fastest, quickly took a few pieces of paper from Chang Haonan's hand, and put on the glasses he had just taken off again.

However, he only saw the first page with a stunned expression.

"You...... Have you simulated the process of this surge failure in a positive direction? ”

"Yes." Chang Haonan nodded and continued to explain:

"According to my calculations, at the time of the accident, the two-stage rotor blades of the high-pressure compressor were the first to flow apart, and then quickly spread to the entire high-pressure compressor, and induced the axial low-frequency oscillation of the air flow in the combustion chamber and turbine behind, and finally affected the low-pressure compressor part in front."

Yan Zhongzhong didn't answer, just lowered his head and continued to look at the calculation results in his hand.

Of course, he can understand these things on paper.

In other words, if it weren't for Chang Haonan, who was hanging on and hanging, Yan Zhongzhong would have been the person who had the deepest understanding of turbine engine performance digital simulation technology in the entire Huaxia at this point in time.

Not one of them.

When he was studying in the UK more than ten years ago, he did research in this direction.

He even worked with his mentor to develop a modular turbine engine steady-state and transient performance simulation tool, which was at the absolute top level at the time, and has even been used by some research institutes to update its version all the way to today.

However, in China in the early 80s, there was no foundation in this regard, so after Yan Zhongzhong returned to China, he still took over the overall design work of the 606 Institute, and failed to continue to explore in the field he was good at.

In other words, the reason why he was able to return to China so easily was precisely because the other party saw that his greatest ability was impossible to display in Huaxia at that time.

That's why we didn't block it too much.

By the mid-90s, when he finally had some conditions, Yan Zhongzhong had not been exposed to related technology for more than ten years, and it was almost equivalent to having to start all over again if he wanted to pick it up.

Still, his knowledge base is there.

Therefore, when Yan Zhongzhong saw Chang Haonan's simulation and calculation ideas, the things that had been engraved in the DNA were instantly stimulated.

To put it simply, the overnight work he carried out with the engineers of the 606 Institute belonged to the backward analysis of the working conditions at the time of the failure when the fault was known.

Chang Haonan's simulation is based on the flight conditions of the aircraft and the structure of the engine, and positively calculates where the "weakest part" of the compressor is in the process from normal operation to surge.

While it may seem like you can find the location that induces the surge, the efficiency of both methods and the help in understanding the root cause of the failure are not the same!

There was silence in the entire office, except for the sound of Yan Zhongzhong flipping the paper from time to time.

After about twenty minutes, he finally finished reading the entire content of the pages in his hand.

The calculation process is perfect.

Then all that's left is the validation of the results.

As long as the position calculated by Chang Haonan is consistent with the working conditions of the O point he found on the oscillating ring, it means that it is the correct answer!

At this time, Yan Zhongzhong was very glad that he had not relaxed his work in the past night.

Otherwise, a young newcomer will take out the results, and they don't know if they ask three questions, and they don't even want to have a face.

"Let's put aside the work at hand and verify whether the working conditions of the secondary rotor of the high-pressure compressor are consistent with the O point we just found!"

After hearing Yan Zhongzhong's voice, the rest of the room woke up like a dream and hurriedly returned to work.

Although they still didn't know what Chang Haonan had brought, judging from Yan Zhongzhong's performance on the other side, it must be very important to solve this problem.

Minutes and seconds passed.

Yan Zhongzhong's heart is very complicated.

If there is no problem with Chang Haonan's calculation process and results, it is not only equivalent to finding the problem, but can even be directly used to guide the follow-up improvement work of the engine.

But on the other hand, it also meant that the turbojet 14's compressor design was flawed.

Because if it is a manufacturing defect that causes the surge, then it will definitely not match the results obtained by the simulation method.

Knowing a result to verify is essentially equivalent to the answer, and the workload and difficulty are naturally much smaller.

Therefore, Yan Zhongzhong did not wait too long.

"Yan Gong, it can be completely matched, it is indeed a problem with the second-level high-pressure rotor!"

An engineer exclaimed, excitedly pointing to two data curves on a computer screen that almost coincided together.

The house was in an uproar.

"Really...... Can it really be calculated? ”

"So, he ran out on his own last night to find a place to do a computational simulation?"

"Compared to this...... It only took him one night to directly analyze the cause of the failure, which is the most outrageous......

“……”

On the other side, Yan Zhongzhong, who heard the result, exhaled a long breath.

It's like an exam.

Waiting for the results is often more painful than knowing that the score is not good.

Anyway, there's a definite result.

The next task is to clean up and start preparing for the improvement of the compressor.

"Xiao Chang, this time, you are really our hero!"

Yan Zhongzhong shook Chang Haonan's hand with a tired face:

"Let's go rest first, there's still a lot of work to be done."

(End of chapter)