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Chapter 42 Finding the Cause of Failure
The exhaust from the engine is obviously black, this is not normal, the situation is wrong!

Why is the exhaust black?

Everyone is an expert in the field of aero engines, not only saw the abnormality at once, but also knew the reason for the abnormality.

Why is there black smoke?
That's because the lubricating oil participated in the combustion, and the burning of lubricating oil emits black smoke. The black smoke produced by the burning of lubricating oil and the exhaust gas produced by fuel combustion are discharged from the engine tail pipe together, and the color is naturally black. The harder it is, the darker the color of the exhaust.

"The color is very black!"

"Yes, it seems that the burning oil is very powerful!"

"Based on this, one or two liters of oil can be burned in less than an hour."

There was no movement in the test control room, and everyone started talking.

Wang Tianfang said, "Report the oil consumption data!"

As soon as his voice fell, a test driver immediately reported loudly, "The oil consumption is [-] liters per hour."

Many people looked at the gauges on the test console, and found that the average oil consumption per hour was also rising as the test progressed.

Judging from the actual test run, the oil consumption is higher than the data fed back from the field.

After about ten minutes, the oil consumption situation was basically mastered, and the first-hand data was obtained through the test run.

Wang Tianfang said loudly, "Stop the test run and hold a meeting in the factory building at two o'clock in the afternoon."

The engine gradually stopped, and the tester also recorded the remaining rotation of the engine, which was completely normal and met the qualification requirements.

Two in the afternoon.

The meeting was held in the factory building. There were at least [-] people sitting in the meeting. Lin Feng sat on the side. He mainly listened to the situation at the meeting.

The meeting was not long, only about three or four 10 minutes. Wang Tianfang presided over the meeting, first introduced the basic situation of the three troubleshooting engines, and then divided some tasks.

The next step is to disassemble the engine to find out why the oil is leaking, that is to say where the fault is.

After a while.

A lot of people surrounded the No. 1 assembly table in the assembly workshop. Wang Tianfang, Meng Bowen, etc. were all there. Almost all the people who participated in the meeting came, and Lin Feng was also standing on the side.

On the assembly stage, several workers began to be busy disassembling the engine numbered "0212".

The disassembly and assembly of the engine are different. If it is assembly, start with the combustion case first, because the combustion case is the benchmark of the entire assembly.

After the benchmark is done, the next step of assembly work can be started, such as assembling the turbine casing, the compressor part and so on.

When disassembling, move closer to the middle from the beginning and the end, first remove the turbine part of the engine, then remove the reducer part located at the front end of the engine, and finally separate the compressor part and the combustion chamber part.

The speed of dismantling the engine into large parts is very fast. In about half an hour, the engine has become a state of large parts.

"Mr. Wang, it has been disassembled into a state of large parts."

Wang Tianfang said, "Put the combustion chamber part on the disassembly table for further disassembly."

In the conference room half an hour ago, everyone was discussing. Most people thought that the oil leak should be in the combustion chamber, and Wang Tianfang also thought so.

Everyone is engaged in engines, and they are familiar with the structure of turboprop six engines. When a failure occurs with a large amount of oil consumption, many people think of oil leakage, and some people can roughly infer the cause of oil leakage. several possible locations.

There are fuel pipelines and lubricating oil pipelines in the combustion chamber casing. The two systems of lubricating oil and fuel oil do not interfere with each other and are relatively independent.

The fuel is burned in the combustion chamber, and the lubricating oil lubricates the two most important bearings in the combustion chamber casing, which are the turbine bearing and the compressor bearing.

Regardless of the fact that the combustion chamber is a sheet metal part welded by hundreds of parts, whether it is the two mounting surfaces of the casing or the two bearing holes, the precision requirements are very high.

The combustion chamber casing of this engine was hoisted to the disassembly table not far away, and the workers began to further disassemble it, dismantling it into parts.

Wang Tianfang, several experts from the Engineering Technology Department, and the technical director of the test workshop, etc., surrounded each other very closely, watching the parts on the combustion chamber casing being removed one by one.

While watching the entire dismantling process, they carefully observed where the lubricating oil leaked.

The turbine bearing was removed, and the hole was full of lubricating oil, and the workers who dismantled the bearing also had their hands full of lubricating oil.

Wang Tianfang said, "Find a clean rag and wipe off all the lubricating oil in the bearing hole."

Someone from Mashan wiped it with a clean rag, and the inside of the bearing hole was wiped clean, making it look a little brighter.

"Look, everyone, take a look."

Because the lubricating oil was wiped clean, the situation could be seen more clearly, and the part where the lubricating oil leaked was also found.

"As expected of Mr. Wang, he found the problem so quickly."

"The oil seeped out of the receiver, and I think the leak was in the receiver."

"I also think so."

Everyone is an expert. Looking at the oil penetration, it is basically inferred that the oil leak is on the second layer of the casing.

The combustion chamber casing is divided into two layers, the innermost part is the combustion chamber part, and the outer layer is various pipelines, fuel pipelines, lubricating oil pipelines and so on.

If the leak is on this layer, which is the second layer full of fuel lines and lubricating oil lines, it will be troublesome.

The second layer is welded and cannot be opened, because the combustion chamber casing is a life-long part, and it can be used for as long as the engine is used.

In the design, there is no consideration at all to repair the various pipelines and oil circuits in the casing, because they are also full-life, and generally there will be no problems.

Now comes the problem, the leak is inside the second receiver, which is a tricky problem.

Sure enough, Wang Tianfang was the first to frowned, feeling that the problem was too difficult to deal with.

Some people may say, since it can't be repaired, then replace the combustion chamber casing, can't it be replaced with a new one?

This is layman's work.

Not to mention how much it costs to replace a combustion chamber casing, technically it cannot be easily replaced. Such key and important parts of the whole life are generally not replaced. Once replaced, it will cause a series of problems.

If you can't replace it, you can only repair it.

But how to fix it?

The Phoenix Factory has never had such a repair precedent, nor is it in the overhaul manual of the turboprop six. This aspect is technically blank.

Should I just give up if I don’t cultivate?
That is also impossible. There are three engines in total, and each engine costs more than 300 million. How can such a precious thing be given up.

Besides, only three engines have been found so far, who can take care that there will be no similar faulty engines in the future.

How to do it?

Wang Tianfang's brows were tightly furrowed, and many other people also had serious expressions. Everyone has encountered a big problem, a very difficult big problem!
Lin Feng stayed by the side all the time, and obviously felt that the atmosphere was not right, and immediately realized that this was a difficult technical problem.

Everyone has no solution to the problem for a while, so can you consult the system?

Before crossing, Lin Feng and the system had reached an agreement, not only obtained the god-level learning talent, but also, the system promised to help Lin Feng solve a total of [-] technical problems.

(End of this chapter)