Liu Qingshan cleared his throat and said: "Comrades, I would like to tell you a very unfortunate news that our turboprop B engine has had several successive quality problems of lubricating oil leakage in the outfield, and they mainly occurred in the HNA ......."

Liu Qingshan combined the pictures and introduced the whole situation in detail.

Now, Li Tianfeng is basically clear about the situation, the main fault is that there is an oil leakage in the burner casing of the turboprop B engine, and it is not a single case, so far, there have been three cases, the engine with quality problems has been shipped back to Plant E, and no one can guarantee whether there will be such a problem in the future.

The navy has aviation and is also equipped with transport aircraft, and its main transport aircraft, the Y-8, is equipped with a lot, and the power of the Y-8 is the turboprop B engine, and one aircraft is equipped with four turboprop B engines.

Turboprop B engine weight 1200 kg, power 4250 horsepower, in recent years, after performance improvement, the power has been improved, but in the international arena, the turboprop B engine is still relatively backward, equipped with turboprop B engine of the eight aircraft can only be regarded as a medium-sized transport aircraft, and the United States transport aircraft, especially large transport aircraft, that gap is not a little bit.

The current situation of the domestic aviation industry is like this, and there is a big gap between the developed countries in the international aviation industry, which is also one of the main reasons why Li Tianfeng wants to resign and start a business, develop advanced aero engines, and develop advanced aircraft.

After listening to Liu Qingshan's introduction, everyone frowned, everyone felt that the problem was very tricky, the burner casing was very complicated, especially the internal cavity was a lot, there were also a lot of pipelines, and it was difficult to determine where the oil leakage was.

In addition, even if the location of the oil leak is determined, how to troubleshoot and repair the location of the oil leak is even more tricky.

The combustion chamber casing of the turboprop B engine cannot be disassembled, and if you want to disassemble it, you can only remove some plugging covers, screws, and main components at all.

Everyone is an expert, and they can see at once what the problem is, so everyone is frowning and helpless.

If there is a lubricating oil leak, then the situation is very serious, take the turboprop B engine as an example, if the lubricating oil leaks while working, the engine will call the police, and the pilot must immediately make a forced landing when he encounters such a situation.

Aero engine lubricating oil leakage, or lubricating oil consumption is relatively large, this is not a small problem, aero engine lubricating oil consumption has strict indicators, beyond this index, it is an engine failure, must be troubleshooting.

The lubrication system of the aero engine is an independent circulation system, which is relatively independent of the fuel system and does not interfere with each other, and the lubricating oil is reused in this circulation system to lubricate the bearings, gears and other parts of the aero engine that rotate at high speed.

Because, after the oil leaks, the oil in the engine falls below a certain level, and the engine will stop in the air.

To put it in layman's terms, the plane is at high altitude, the engine is not working, the engine is stalled, the propeller stops, and when such a situation occurs, how about the danger, I think everyone can understand it!

The atmosphere in the conference room was solemn and dull, and after a long time, an old expert wearing reading glasses sighed and said: "Mr. Yang, the problem is very tricky, even if we find out the leakage part, it is not easy to repair it, this repair must be welded to the leakage part, the combustion chamber casing structure is so complex, whether our welding torch can reach into it is a big problem." ”

"In addition, even if our welding torch is lucky enough to reach in for welding, but what to do once welding deformation, there are many precision positioning holes on the combustion chamber casing, as well as our main bearing mounting holes, the precision of these holes is very high, once the welding deformation, the entire combustion chamber casing will be wasted."

Yes, as we all know, this is where the problem lies.

Another expert hesitated: "Mr. Yang, it's better to scrap the combustion chamber casing with oil leakage and replace it with a new combustion chamber casing." ”

Replace the combustion chamber casing! Many experts thought in their hearts that when it came to the last resort, they could only do this.

However, Yang Xianfeng immediately shook his head and denied this plan, "Comrades, you can't just replace it casually, the price of a combustion chamber casing is clear to everyone, in addition, just like this, the problem of oil leakage will cover up the symptoms but not the root cause, this is the next policy." ”

Yes, not to mention that a combustion chamber casing is worth a lot of money, simply replace it, and do not come up with solutions and solutions, this is the next policy in and dilute mud, which is really the next policy.

The best way to solve this problem is not only to troubleshoot the oil leakage, but also to analyze how to make technical improvements to prevent similar problems from happening again in the future.

Seeing that Yang Xianfeng rejected this plan to replace the new casing, the entire conference room was dull again, and everyone was thinking hard and trying to come up with an effective solution.

Li Tianfeng was also thinking, and basically had a solution, Li Tianfeng saw that Yang Xianfeng was looking at him, Li Tianfeng said slowly: "Mr. Yang, I have a preliminary idea, say it for everyone's reference." ”

"Oh." Yang Xianfeng's eyes lit up, "Tianfeng, let's take a look." ”

Li Tianfeng sorted out his thoughts and said: "Mr. Yang, our first step is to find the oil leakage of each combustion chamber casing. ”

Many people say in their hearts, I also know that the first step is to find the oil leakage, but the combustion structure is so complex, how to find the location of the oil leakage, this is not like a doctor to see a doctor, what B-ultrasound, magnetic resonance and other detection methods.

However, Li Tianfeng obviously had his own means, pointing to the projection photo of the combustion chamber casing and said: "Mr. Yang, if you want to detect which part of the lubricating oil leaks, we can conduct a pump inspection." ”

Pump check!

Quite a few people's eyes lit up, as if they had caught something. Everyone is an expert in the end, as long as you pierce this layer of window paper, you can immediately understand, Yang Xianfeng's level is even more high, and he will immediately know Li Tianfeng's plan.

Seeing Yang Xianfeng nodding to himself, Li Tianfeng continued: "Lubricating oil leakage, it must be that there is a problem with the lubricating oil pipelines inside the combustion chamber casing, we will block all the outlets of these pipelines, leaving a port, from here to pass in a few atmospheres of air, and then put the entire combustion casing into the water, see where the bubbles come up, and the location of the bubbles is the part where the lubricating oil leaks out."

That's right! Why didn't I think about it!

Suddenly, a group of experts suddenly brightened up, and their eyes lit up, and everyone was almost impressed by Li Tianfeng at once.

This reason is very simple, but very practical, I believe everyone has seen the bicycle tire repair bar, the bicycle inner tube is punctured, the tire repair master will puff the inner tube, and then put the inner tube into the bucket filled with water, where the bubbles, that is the punctured part.

What Li Tianfeng just said is also the same truth.

"Okay, that's it." Yang Xianfeng said: "Director Xu, go and arrange it immediately, and follow Expert Li's method to do it." ”

Xu Yungen, the director of the sheet metal workshop, immediately looked overjoyed and said loudly: "Mr. Yang, I'll arrange it right away." ”

With Director Xu's arrangement, the first combustion chamber casing was quickly filled with air at three atmospheres and hoisted into a large pool until it was completely submerged in water.

Yang Xianxian, Liu Qingshan, and a group of experts, including Li Tianfeng, stood next to the pool, carefully looking at the combustion chamber casing that was immersed in water.

"Look, look, it's bubbling!"

"It's bubbling!"

Everyone was amazed and pointed to the combustion chamber casing that was bubbling with a series of tiny bubbles. Sure enough, the combustion chamber casing under the water is bubbling in a series of bubbles, which is very obvious.

Yang Xianfeng was also in a good mood, no longer as dignified as he was in the meeting just now, found the location of the oil leak, and the problem was basically half solved.

"Director Wu, can you determine the detailed location of the oil leak?" Yang Xianfeng asked.

Director Wu of the sheet metal workshop hurriedly said: "It must be possible, there is no problem, so I can't determine the specific location, so I, the technical director, might as well find a piece of tofu to make money." ”

"Haha......"

All around, everyone laughed good-naturedly.

Although the internal structure of the combustion chamber casing is very complex, there are a lot of pipelines and cavities, but everyone is eating this bowl of rice, either experts or technical backbones, naturally the internal structure of the combustion casing is very clear, and a three-dimensional structure of the combustion casing can emerge in their minds with their eyes closed.

Just like a clever doctor, the structure of the human body is very complex, with many organs, blood vessels, nerves, etc., but doctors also know it clearly.

Therefore, when you look at the location of the gas leak, you basically know which specific location of the lubricating oil pipeline in the combustion chamber casing has leaked, and Director Deng is naturally just as clear.

Liu Qingshan was also in a very good mood, and gently patted Li Tianfeng's shoulder and said, "Tianfeng, yes, the method is very novel." ”

One by one, the combustion chamber casing was successively hoisted into the water, and the location of the oil leakage was determined one by one, everyone looked at Li Tianfeng with admiration, and many people thought in their hearts, Li Tianfeng didn't look at him as a young man, but he lived up to his name, he had two brushes.

The first step is completed, the oil leak has been determined, and the next step is to repair it, but many people are worried about how to repair it, which is a very tricky problem.

The combustion chamber casing, in addition to a lot of precision holes, there are also a lot of precision mounts, in addition, their own precision requirements are also very high, repair is not very big, once the welding deformation, the entire combustion chamber casing will be scrapped.

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