The parts of this turboshaft E engine were completely disassembled, and the parts were neatly arranged on several rectangular inspection tables.

Some of the designers, technicians, inspectors, etc., who were present, saw Li Tianfeng, and many people were ready to come up to greet Li Tianfeng, Li Tianfeng waved his hand, indicating that it was not necessary, and then, Li Tianfeng sat next to an inspection table, personally picked up a part and looked at it seriously.

On this inspection table, there are parts of the combustion chamber, including the combustion chamber casing, flame cylinder, oil throwing pan, etc., large and small parts and a large table.

The fuel is mixed with air in it, and the working temperature of the combustion chamber is the highest, among them, the temperature of the flame cylinder is the most, Li Tianfeng picked up the flame cylinder and looked at it very carefully, and even picked up a magnifying glass to take a serious look at some details.

After such a long period of work, the color of the flame cylinder naturally changes under such high temperature conditions, and it is obvious that the color has darkened and darkened, but this change is allowed, as long as there is no ablation or hot corrosion.

"Well, there is basically no ablation, and there is no thermal corrosion." After Li Tianfeng looked at it, he said in his heart.

Then, Li Tianfeng looked at the casing of the combustion chamber again, also looked at the oil dumping pan, and even focused on the inner wall of the combustion chamber, on the inner wall, there was also a slight change in color, this is due to the high temperature, Li Tianfeng specially took a small flashlight, magnifying glass, and looked at it carefully.

After looking at it like this, Li Tianfeng nodded, according to Li Tianfeng's professional vision, this color change was completely within the allowable range.

After looking at several important and key parts of the combustion chamber part, Li Tianfeng knew in his heart that these parts were basically fine. There are no major problems, and it is completely possible to continue to install and work.

Generally speaking, the parts of the combustion chamber are basically life-long, such as the combustion chamber casing, flame cylinder and other parts. The so-called whole life cycle is from the production and manufacturing. It is used until the end of the engine's overall life, and it does not need to be replaced during successive overhauls.

The first turnover life of the turboshaft E engine is set at 3,000 hours, and the full engine life is 12,000 hours, and it is only then that the test run reaches 3,000 hours.

In front of an inspection table next to him, Qiu Wenan was holding a turbine working blade and looked at it very attentively, and after looking at it for a long time, he nodded. Putting down the blade, he inadvertently looked up and saw Li Tianfeng.

Qiu Wenan hurriedly said, "Boss, you are also here." ”

Li Tianfeng nodded and said: "I just finished reading several major parts of the combustion chamber part, and the parts are in very good condition, and we can continue to install and test them." ”

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

Saying that, Qiu Wenan 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 is subjected to the highest turbine temperature, the harshest working environment, and some detail problems. Li Tianfeng even picked up a magnifying glass.

The turbine blades of the turboshaft E engine are all single crystal blades, and the surface is not only coated with thermal barriers, but also has an ultra-cold structure 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 crystalline blades eliminate lateral grain boundaries that are sensitive to voids and cracks, and make all grain boundaries parallel to the stress axis, thus improving the performance of the alloy.

The ideal structure of a single crystal blade casting is the blade root, body and crown, all of which are composed of defect-free multiphase single crystals. The orientation of the crystal should be 〈100〉, and the deviation from the direction of the main stress axis 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 PwAl480, which has a 25°C advantage over the best directional solidification casting superalloy PwAl422; The second generation is represented by PwAl484, which is 25°C higher than the first generation.

The single crystal blade developed by Tianfeng Technology belongs to the third generation, also known as the third generation of single crystal blade, using the third generation of single crystal blade, the temperature before the engine turbine can reach more than 2000K. And the strength is higher than that of the second-generation blades, and it can output more powerful power.

After Li Tianfeng looked at it, he said: "Mr. Qiu, the leaves are in good condition, not only is there no ablation, but these cooling holes are very smooth and not blocked in the slightest. ”

Qiu Wen'an said: "Boss, I have looked at at least a dozen turbine blades, and the situation of each one is similar, basically there is no major problem, and it can continue to be used." ”

Li Tianfeng nodded, and then asked, "How is the situation of our turbo disk?" ”

Qiu Wenan picked up the first-level turbo disc and said: "The situation of the turbo disc is also relatively good, there is no big problem, boss, you can take a look." ”

The turbine disc is also a full-life part, Li Tianfeng took the turbine disc and looked at it seriously, from the appearance, there is no big problem with this turbine disk, it is the key tenon groove, Li Tianfeng looked at it very carefully.

Li Tianfeng nodded and said, "Yes, this shows that our turbine disc is first-class in terms of design, materials, and manufacturing technology." ”

Qiu Wen'an and Li Tianfeng took a serious look at several turbine discs, and then looked at the sealing parts that are prone to wear, such as the turbine outer ring with honeycomb, the parts with sealing grate teeth, etc., these parts basically have different degrees of wear.

Qiu Wen'an said: "Boss, there is wear and tear, especially the honeycomb of the outer ring of this turbine, the wear is a little stricter. ”

These things are originally wear parts, and every time they are overhauled, they must be repaired or replaced according to the actual situation.

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

Qiu Wen'an also agreed: "I think it can also be used continuously, these grate teeth also have a certain degree of wear and tear, but it does not affect the sealing, and they can also continue to be used." ”

Li Tianfeng picked up a part with grate tooth and looked at it seriously, these parts have several sealed grate teeth, and there is a certain amount of wear, which can be clearly seen, but the wear of the grate tooth is within the allowable range. The design size of the grate tooth of the turboshaft E engine is generally 5mm in height, and after 3000 hours of testing, the most worn grate tooth is only a few tenths of a millimeter.

Qiu Wen said: "Boss, you haven't seen the main bearings of this engine." ”

Li Tianfeng said: "I was about to take a look at the situation of these bearings. ”

This turboshaft E engine began 3000 hours of test run half a year ago, the original bearings are all domestic bearings, the best top aviation bearings produced by a national bearing factory in China, although it is the top in China, but there is a certain difference compared with the top international aviation bearings.

Half a year ago, Tianfeng Technology Company had not formed a cooperative relationship with Linhai Technology Company, and this turboshaft E engine was naturally not equipped with the high-quality aviation bearings produced by Linhai Technology.

Before the installation of the kind of high-quality aviation bearings produced by Linhai Technology Company, whether it is a turboshaft D or a turboshaft E engine, the maximum life is limited by the quality of the bearings, especially the main bearings of the engine.

Of course, Li Tianfeng wanted to take a look at the situation of these main bearings after 3000 hours of testing, so Li Tianfeng took white gauze gloves and picked up one of the main bearings to look at it, and even used a magnifying glass and a flashlight in order to see more clearly.

Next to him, Qiu Wenan was the same, and he also looked at a certain main bearing carefully.

After Li Tianfeng looked at it, he frowned slightly, obviously dissatisfied, because after 3000 hours of testing, this bearing has been slightly worn, and the bearings of aero engines, especially the main bearings, have zero damage tolerance.

That is to say, the bearings of aero engines, especially the main bearings, are not allowed to be damaged, even if it is a slight damage, because the bearing damage will affect the safety and use of the engine.

Qiu Wenan also saw that the situation was a little bad, and the quality of the bearings still couldn't keep up with the needs, so Qiu Wenan said: "Boss, these bearings have shown some slight wear." ”

Li Tianfeng nodded and said: "Yes, there are some bright spots on the bearing balls, Mr. Qiu, how long do you estimate how long these bearings can be used." ”

High-quality aviation bearings, new bearings because the surface of the balls is very smooth, under strong light, such as irradiation with a small flashlight, the surface of each ball is jet black, only a small bright spot to the eye.

If there is wear and tear, you will see a slight scratch on the surface, or a few small bright spots, if the wear is more strict, there will be pitting, and then it will peel off, and the small pitting will become tiny pits.

Qiu Wenan thought for a while and said: "Boss, it's really hard to say how long these bearings can be used, maybe more than a thousand hours, maybe more than two thousand hours." ”

Li Tianfeng nodded and said, "I estimate that it can still be used for about two thousand hours." ”

Qiu Wen'an said: "Boss, then these bearings will not be replaced, continue to install and test, and see what is the maximum life of our turboshaft E engine." ”

Li Tianfeng said: "I have this intention, not only these bearings can continue to be installed, but all parts of this engine can also continue to be installed, without repair, as it is for final assembly, after the engine is completed, it will be sent to the test workshop to continue the test." ”

Qiu Wen'an said: "Well, let's try the maximum life of the turboshaft E, our turboshaft D in the case of domestic bearings, the maximum life is more than 4680 hours, I estimate, the maximum life of the turboshaft E engine will exceed this number." ”

Li Tianfeng said: "Whether it is a turboshaft D or a turboshaft E, the design, material and craftsmanship of each part of the engine are first-class, and the life span is very large, and the quality of the bearing is very limited. ”

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Today's two watches, the first one is sent! (To be continued......)