The parts of this turboshaft e engine have been completely disassembled. Each part is placed neatly on several rectangular inspection tables.≧,

Some designers, craftsmen, inspectors, etc. present, when they saw Li Tianfeng, many people were about to come up to say hello to Li Tianfeng. Li Tianfeng waved his hand and signaled that there was no need. Then, Li Tianfeng sat next to an inspection table and picked up a piece of parts and looked serious.

On this inspection table, the parts of the combustion chamber are placed, including the combustion chamber receiver, flame drum, oil tray, etc., and a large and small table of parts.

The fuel is mixed with air to burn, and the working temperature of the combustion chamber is the highest, among which the flame tube is the most under the temperature. Li Tianfeng picked up the flame tube and looked at it very carefully. He even picked up a magnifying glass and carefully looked at some details.

After such a long time of work, the color of the flame barrel naturally changed under such high temperature conditions, and it was obvious that the color became darker and darker, but this change was allowed, as long as there was no ablation or thermal corrosion.

"Well, there was basically no ablation, nor did there be thermal corrosion." Li Tianfeng said in his heart after looking at it.

Then, Li Tianfeng looked at the combustion chamber receiver, the oil-swinging plate, and even focused on the inner wall of the combustion chamber. There was a slight change in color on the inner wall. This was caused by the high temperature. Li Tianfeng took a small flashlight and a magnifying glass and looked carefully.

After watching this, Li Tianfeng nodded. According to Li Tianfeng's professional perspective, this color change is completely within the allowable range.

After looking at several important and key parts in the combustion chamber, Li Tianfeng knew that these parts were basically fine. There was no major problem and he could continue to install the machine.

Generally speaking, the parts of the combustion chamber are basically full-life, such as the combustion chamber receiver, flame cylinder and other parts. The so-called full-life is from production and manufacture until the overall life of the engine is over, and there is no need to be replaced during previous major repairs.

The first turnover life of the turboshaft e engine is set to 3000 hours, and the full engine life is 12000 hours. This is only the test run to 3000 hours. These parts perform so normally, it is completely understandable.

In front of an inspection table next to it, Qiu Wen'an was holding a turbine working blade and watching it very well. After looking at it for a long time, he nodded. He put down the blade and looked up accidentally, and happened to see Li Tianfeng.

Qiu Wen'an hurriedly said, "Boss, you are here too."

Li Tianfeng nodded and said, "I just finished looking at several major parts in the combustion chamber. The parts are in very good condition. You can continue to install the machine and test drive."

Qiu Wen'an also said: "Boss, I'm looking at these turbine blades, and these blades are in very good condition. Take a look."

As he said that, Qiu Wen'an also gave the turbine in his hand to Li Tianfeng. Li Tianfeng took the blade, sat down, and looked at it seriously.

This is the first-stage turbine blade, which bears the highest turbine temperature and the harshest working environment, and some details. Li Tianfeng even picked up a magnifying glass.

The turbine blades of the turboshaft e engine are all single crystal blades. The surface not only has a thermal barrier coating, but also has an ultra-cooled structural design. The blades are hollow and have dense cooling holes.

The so-called single crystal blade is a cast blade with only one grain. Such directional crystal blades eliminate lateral grain boundaries that are sensitive to cavity and cracks, making all grain boundaries parallel to the stress axis direction, thereby improving the performance of the alloy.

The ideal structure of single-crystal blade castings is the leaf root, leaf body and leaf crown, both composed of defect-free multiphase single crystals. The crystal orientation should be in the (100) direction, and the deviation from the main stress axis direction of the blade should not be greater than 10 degrees.

Single crystal blades can be divided into three generations: the first generation is represented by pal480, which has an advantage of 25% over the best directional solidification cast high-temperature alloy pal422; the second generation is represented by pal484, which is 25% higher than the first generation.

The single crystal blades developed by Tianfeng Technology belong to the third generation, also known as the third generation single crystal blade. Using the third generation single crystal blade, the engine's temperature can reach more than 2,000k before the turbine. It has a higher intensity than the second generation blade and can output stronger power.

After looking at it, Li Tianfeng said, "Mr. Qiu, the leaves are in good condition. Not only does there be no ablation, but these cooling holes are very smooth and there is no blockage at all."

Qiu Wen'an said: "Boss, I have seen at least a dozen turbine blades. Each blade is in the same condition. It is basically nothing serious and I can continue to use it."

Li Tianfeng clicked a little and asked, "How is our turbo disc?"

Qiu Wen'an picked up the first-level turbo disc and said, "The situation of the turbo disc is also good, no major problems, boss, take a look."

The turbo disc is also a full-life part. Li Tianfeng took the turbo disc and looked at it carefully. From the appearance, there was no big problem with this turbo disc, it was the key tongue and groove. Li Tianfeng looked at it very carefully.

Li Tianfeng nodded and said, "Yes, this shows that our turbine discs are first-class in terms of design, materials, and manufacturing processes."

Qiu Wen'an and Li Tianfeng looked at several turbine discs carefully, and then looked at the sealed parts that were prone to wear, such as the outer ring of the turbine with honeycombs, the parts with sealed comb teeth, etc. These parts basically had different degrees of wear.

Qiu Wen'an: "Boss, they are all worn, especially the honeycombs on the outer ring of the turbine, which are slightly more severe."

These things are originally worn parts, and they must be repaired or replaced according to actual conditions during overhaul.

Li Tianfeng picked up the outer ring of the turbine and looked at it and said, "Although there is a certain amount of wear, it still does not affect it. You can continue to use it."

Qiu Wen'an also agreed: "I think you can continue to use it. These comb teeth will also have a certain degree of wear, but it will not affect the sealing. You can continue to use it."

Li Tianfeng picked up a piece of part with grating teeth and looked carefully. These parts had certain wear and tear. This wear can be clearly seen, but the wear of the grating teeth is within the allowable range. The design size of the sealing grating teeth of the turboshaft e engine is generally 5mm in height. After 3,000 hours of test run, the most worn grating teeth were visually measured to be only a few millimeters at zero.

Qiu Wendao: "Boss, you haven't seen the major bearings of this engine yet."

Li Tianfeng said: "I'm going to take a look at the situation of these bearings."

This turboshaft e engine started a 3,000-hour test run six months ago. The bearings installed at the time were all domestic bearings. The best top-grade aviation bearings produced by a national bearing factory in China. Although it is the top-grade domestic, it is different from the top-grade aviation bearings in the international market.

Half a year ago, Tianfeng Technology Company had not yet formed a cooperative relationship with Linhai Technology Company. This turboshaft e engine naturally did not have the high-quality aviation bearings that Linhai Technology has recently produced.

Before installing the high-quality aviation bearings produced by Linhai Technology Company, whether it is a turboshaft d or a turboshaft e engine, the service life is limited to the maximum extent by the quality of the bearings, especially the major bearings of the engine.

Of course, Li Tianfeng wanted to take a look. After 3,000 hours of test drive, the situation of these main bearings was so Li Tianfeng wore white gauze gloves and picked up one of the main bearings and looked at them. In order to see more clearly, he even used a magnifying glass and flashlight.

Next to it, Qiu Wen'an was the same, holding a main bearing and looking carefully.

After watching it, Li Tianfeng frowned slightly, obviously not satisfied, because after 3,000 hours of test run, the bearing had slightly worn. The bearings of the aircraft engine, especially several major bearings, have the statement that there is zero damage tolerance.

In other words, the bearings of aircraft engines, especially the main bearings, are not allowed to cause damage, even minor damage, because bearing damage will affect the safety and use of the engine.

Qiu Wen'an also saw that the situation was a little bad, and the quality of the bearings still could not keep up with the need. Qiu Wen'an said: "Boss, these bearings have experienced some slight wear."

Li Tianfeng nodded and said, "Yes, some bearing balls have already appeared on them. Mr. Qiu, how long do you think these bearings will last."

High-quality aviation bearings. For new bearings, because the ball surface is very smooth. Under strong light, if illuminated with a small flashlight, the surface of each ball is black, with only a small highlight facing the eyes.

If there is wear on the surface, you will see slight scratches or a few small highlights on the surface. If the wear is serious, pit spots will appear. If it is severe, peeling will occur, and the small pit spots will become tiny pits.

Qiu Wen'an thought for a while and said, "Boss, it's hard to say how long these bearings can last. Maybe more than one thousand hours, maybe more than two thousand hours."

Li Tianfeng nodded and said, "I guess it will take about two thousand hours."

Qiu Wen'andao: "Boss, these bearings will not be replaced. Continue to install and test the engine to see what the maximum life of our turboshaft e engine is."

Li Tianfeng said: "I am just thinking that not only these bearings can be installed, but all parts of this engine can also be installed without repairing them. They will be assembled as they are. After the engine is completed, it will be sent to the test workshop for further testing."

Qiu Wen'an: "Well, let's try the maximum life of the turbo shaft e. When our turbo shaft d is equipped with domestic bearings, the maximum life of the turbo shaft d is more than 4,680 hours. I estimate that the maximum life of the turbo shaft e engine will exceed this number."

Li Tianfeng said: "Whether it is the turbo shaft d or the turbo shaft e, the design, material and process of the engine parts are first-class, and the service life is largely subject to the quality of the bearings."

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Two updates today, the first update is here! (To be continued...)
Chapter completed!