Chapter 1403: Blocking the gate of infrared radiation
It took Liu Yongquan a long time to finally convince the other party that this was not a "concernful little surprise" he specially prepared, but a pure accident. "Didn't you notice any of your previous tests?"
Yang Wei was a little unbelievable.
"You are the only one in China to form a measurement system composed of tunable laser arrays and interferometers. The 606 Institute is still using the most traditional infrared thermometer and cannot eliminate the interference of the surrounding signal. As a result, you saw it just now, and they are all connected together, and you can't tell which is at all."
In fact, the infrared signal distribution index does not require particularly refined measurements, after all, no infrared seeker will accurately target a piece of your skin.
The 606 Institute spent a lot of money to buy such a set of assets, and the main purpose is to measure plasma distribution.
Infrared signal is just a test.
It was just that the willows were accidentally planted into shade, which made the two of them discover a very mysterious detail.
Yang Wei controlled the mouse display to slide repeatedly, enlarging the image of the abnormal area to the limit. The depression on the infrared radiation curve was clearly visible, as if a sudden canyon was split out in the data torrent.
He turned to look at Liu Yongquan, who was trapped in thought, his brows almost twisted.
Seeing that I couldn't analyze one, two or three for a while, I simply ordered:
"First, I will scan the interference in other directions to see what the derivation of the three-dimensional diagram looks like..."
This new device has just been installed not long ago. Yang Wei only conducted several verification tests during the debugging process. Today is the first time that he has officially put into use and has not yet established enough trust.
In other words, in addition to further obtaining data, it also needs to troubleshoot factors such as faults or random errors.
However, putting aside the metaphysical factors, it is really a very unlikely event to have problems with the new equipment that has just passed the acceptance.
So after the roar of the engine sounded intermittently for most of the day, the two finally got the same result as before.
But this time it was shown in three-dimensional form.
"This position... should correspond to the engine tail nozzle?"
Due to the existence of the tail flame, the end of the coordinate axis is not the end of the aircraft itself, which makes it not particularly intuitive even if it is a three-dimensional image.
"That's right." Liu Yongquan gave a positive answer, but quickly corrected it: "But strictly speaking, it should be the transition part between the tail nozzle and the main body of the engine. Normally, it should be the third highest temperature in the outer layer of the entire aircraft except for the tail flame body and the nozzle. Without turning on the afterburner, the plasma surface must be about 800-850℃. Of course, due to the influence of magnetron, it will be lower on the material, but it must also have a 500℃ effect."
Speaking of this, he pointed to the depression on the screen:
"And if this radiation signal directly corresponds to the temperature, it should be only a level of 120-150℃..."
For a moment, everyone was silent.
Yang Wei tried his best to recall every detail of the past and soon thought of a noteworthy place:
"When I went to Yanliang before, I saw the turbofan 10G being tested on the air platform. I remember that the tail nozzle at that time was as bright and silver as the turbofan 10A, not the same as it is now?"
"The tail nozzle and the transition section were coated separately in May last year..."
Liu Yongquan's voice came to an abrupt end here, and he immediately understood what the other party meant.
Yang Wei also spoke almost at the same time: "Is it possible that the thermal insulation coating at the connection has been replaced, resulting in enhanced thermal insulation effect and reduced apparent temperature?"
But the former shook his head almost without thinking:
"The reason for changing the new coating formula is because the old paints in the past could not adapt to the outer temperature of the 10G turbofan, and the main function of the coating is to prevent thermal corrosion. There is no material that can maintain an outrageous temperature difference of hundreds of degrees through a thickness of just a millimeter..."
He said and touched his bald head, and said half-jokingly:
"If this insulation effect can be achieved, we should call the Institute of Materials of the Academy of Sciences now and let them come over overnight to arrange a new academician title."
Yang Wei did not take this incident, but just knocked his fingers on the console unconsciously.
A few minutes later, he said again:
"I think that at this time, I still have to return to the most traditional method." Then he quickly walked to the front of the podium:
"Use a contact temperature measuring probe to restart the test!"
Twenty minutes later, the roar of the engine filled the entire test workshop again.
But the device fixed on the robotic arm has changed from a tall laser array to a plain, but almost equally expensive platinum temperature sensor.
This temporary addition has not been included in the unified testing system. Fortunately, the data of contact temperature measurement is extremely straightforward and does not require any complicated secondary processing.
The front-end operation table can directly see the reading.
"1100K."
After a series of preheating, the operator's report came from the communication system.
Equivalent to about 827℃, which is similar to what Liu Yongquan said just now.
"It's really TM's hell..."
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Looking at this result, Yang Wei couldn't help but swear.
High temperature, but low infrared signal.
"Wait..."
Liu Yongquan, who had not spoken for a while, suddenly interjected: "Switch off the magnetron and plasma generator,...and then change the laser array and interferometer to scan again."
The engineer next to the test station almost mechanically executed the instructions, took off the probe that had just been installed, and replaced it with the non-contact measuring equipment.
The light blue glow at the tail of the machine No. 2003 suddenly became solid, and the plasma originally scattered on the surface of the machine seemed to be converged by an invisible hand, converged in the direction of the tail nozzle along a specific trajectory, and then disappeared.
This time, of course, there is no need to make detailed three-dimensional results.
The sag on the two-dimensional result curve is also much shallower than last time.
But if you look closely, you will find that the reason for the shallowness is the loss of the high-temperature plasma covering the outer layer, which leads to a significant reduction in the surrounding "high ground" signal intensity.
However, the infrared radiation value at the lowest point has almost no change.
"It's like there is a gate."
Yang Wei made a vivid metaphor:
"Block all infrared radiation exceeding a certain value...or it may be absorbed. After all, your coating is actually under the plasma, and in principle, it should not block the signal emitted upward."
Liu Yongquan seemed to have been inspired by this sentence, and suddenly turned his head to confirm:
"Do you still think the problem is the coating?"
Yang Wei curled his lips:
"It seems that there is no other possibility. You have ruled out the interference between plasma and magnetron equipment just now, right?"
Liu Yongquan carried his hands behind his back and paced back and forth in the data monitoring room:
"Maybe...I should call the Aviation Materials Research Institute..."
(This chapter ends)