I checked the data and found out which aspects of the problem occurred. Then the next thing is much simpler. The bearing temperature is too high, and the problem is most likely in two places.
First of all, it is the bearing itself. Due to accuracy and material reasons, the friction coefficient is too large, which leads to heat generation, and the cooling speed of the cooling system is not enough, which causes the temperature of the bearing to rise rapidly, thereby overheating.
Next is the problem of the cooling system.
However, the bearings on their engine are not ordinary bearings on the market, but bearings processed by Wang Bin and Tiangong Technology themselves. The precision level is very high, even compared to the highest precision bearings on the market. It's much higher, reaching the level of a classic. At the same time, after being processed, it has undergone many inspections. Finally, before installing it on the engine, the engine installation engineer will also be the most stringent on the bearing. Strict inspections will only be installed on this engine until it meets the standards, so there is absolutely no possibility of problems in terms of precision.
As for the material, it is even more unlikely that there will be problems. After all, the material used in this aircraft engine bearing is also a high-performance bearing steel material produced by their Tiangong Technology. According to the performance, it can be at a temperature of nearly two thousand degrees. , Normal work.
Although the temperature in front of the turbine will reach two or three thousand degrees according to the state of the engine when it is running, it is obviously impossible for the temperature at the location of the bearing to reach this level under the action of the cooling system, and it is only one thousand at most. The temperature of 1°C is already very high, and it is impossible to exceed 2,000°C.
Thinking of poking the old man here, he has roughly judged which aspect is happening. He judged that there must be a problem with the cooling oil circuit system, so he immediately ordered to check the cooling oil circuit of the engine's test bench immediately to see if the cooling system appeared. What's the problem.
Hearing what Professor Poke said, the door of the control room was automatically opened, and the personnel in the control room also entered the workshop again.
At this time, perhaps he noticed that Wang Bin was not in a good mood, and Professor Poke comforted Wang Bin: "President Wang, please don't worry. Judging from my experience, there are more than 90% of the problems. Probability is not the reason for the aviation development itself, but the reason for our test bench.
Because if it is caused by the engine itself, there is no need to wait until now. When the cruise power was turned just now, there would be problems. After all, the operating time under the cruise power was just one hour!
What's more, in the afterburner test just now, this engine has persisted for three minutes. Even if there is a problem in this regard, in fact, this engine is considered a success according to certain standards.
Because under normal circumstances, it is impossible for an aircraft to fly in the afterburner state. After all, no matter what kind of engine it is, if the afterburner state is turned on, it will have extreme effects on both the engine and the aircraft itself. Big challenges will greatly shorten the life of the engine and the aircraft itself.
In addition, under normal circumstances, the afterburner state of the aircraft's engine is basically different and lasts too long, basically it can only last a few seconds or even tens of seconds, even some of the very good ones now. The engine, if the afterburner is turned on, it will not last more than ten minutes. All our engines can last about three minutes in the strong combustion phase, which is already a very good level, so in fact, Our engine is already considered a success.
Of course, if you look at the data we designed before, this engine was actually unsuccessful, because in our design drawings, this engine will last at least 15 minutes to half an hour in the afterburning phase. , After all, the materials we use are not ordinary materials, but the best high temperature and high pressure resistant materials in the world. "
After listening to Professor Poke's words, Wang Bin did not speak, but just nodded. After all, he didn't need to poke the professor to say, he also knew that, after all, he had made up a lot of aerospace knowledge during this period.
What's more, if you really follow the design data, this is only a first-stage afterburner. You must know that although this engine is only a first-generation engine, this engine is not simple. It not only has first-level combustion, but also two And three-stage afterburning state.
According to the design data requirements, in the state of first-level afterburner, the engine must last for more than fifteen to thirty minutes to be considered qualified. At the same time, the thrust must also reach more than 130 kN, while the second-level afterburner Burning should last for at least five minutes, the thrust must be at least 150 kN or more, the highest level three afterburner, at least 15 minutes, the thrust must be more than 170 kN. .
However, this engine is not perfect at this time. In addition to the test bench and other reasons, this engine is still unable to enter the second and third stage afterburning capabilities at this time, but even so, it is actually turning on the first stage afterburner. The state of combustion is only a little more than three minutes, and it will not work. If it is really the cause of the engine, then it is obviously that the engine is not qualified.
Seeing these aviation development experts and young technicians who are inspecting in the workshop, Wang Bin not only prayed silently in his heart: “I hope it's not the engine itself. Otherwise, the trouble will be great. There will be many follow-up plans. It will all be delayed or even overturned."
At this moment, poked the professor and said to Wang Bin again: "Mr. Wang! Let's go to the workshop too!"
Wang Bin nodded, and the two of them walked out of the glass control room, entered the workshop, and came to the test bench.
"Old Dai, do you find any problems?" After coming to the workshop, Professor Poke asked an elderly man on the side. UU reading www.uukanshu.com
"No problem has been found for the time being, but according to my estimation, there should be a problem with the test bench.
Because this simple test bed is not a formal test bed, and according to the previous construction estimates, this test bed can withstand the maximum thrust of only about 25 tons. If there is a slight error during construction, then the test bed There may be a problem! "
Although Professor Poke has basically determined that there is a problem with the test bench, but for the engine part, no one dares to eliminate the engine part at this time. After all, the problem has not been found yet.
One minute and one second passed, and ten minutes passed quickly. Just as Wang Bin, Professor Piao and others gradually raised their hearts, a young technician who was inspecting the link between the engine and the test bed suddenly Called loudly: "I found the problem, the engine cooling system coolant pipe screw is loose."
When everyone heard the young technician's words, everyone's heart was relaxed, and Professor Poke said: "Okay, now that the problem is found, then immediately replace the engine and re-test, and at the same time connect the various pipelines. The part must be foolproof."
After hearing the words of Professor Poke, these young technicians immediately found a hydraulic cart dedicated to lifting the engine, and hurriedly unloaded the engine on the test bench and installed a new one. Engine.
Please remember the domain name of the book's first publication:. The fastest mobile version update URL:
Chapter end
Report
|
Donate
Oh o, this user has not set a donation button.
|