A new aero engine, the first verification test is rarely a one-time success, there are always a variety of problems, Tianfeng Technology Company is not an exception this time, the engine from the start, the output power all the way up rapidly, it seems that it is about to reach the maximum power state, at this juncture, there is a problem.

Li Tianfeng is so experienced, as soon as he hears the sound of the engine has changed, he knows that there must be an abnormality, and then sees the sharp drop in the engine output power displayed on the LCD screen, Li Tianfeng knows that something is bad.

"Stop!"

Li Tianfeng immediately made a decision, immediately waved his hand, and ordered the test driver to stop quickly, and the test commander also knew that something was wrong, and when he saw this, he also shouted loudly and made a stop gesture.

Several test drivers dared to slack off, and immediately stopped the engine, and the engine gradually stopped, and it took two or three minutes before the engine stopped rotating.

There are strict requirements for the residual rotation of the engine, which is a must test item during the test run, after the engine reaches the rated power state, it will work steadily for two to three minutes, and then stop to let the engine stop freely.

Due to inertia, the rotor of the engine cannot stop immediately, but slowly, just like the fan we use in summer, after turning off the power, the fan will gradually turn slower and slower, gradually, until finally it stops completely.

The same is true for aero engines, after stopping, although the engine does not supply fuel to the engine again, the engine does not work again, but the engine rotor completely stops for a period of time, this period of time has strict requirements, the engine stops to the rotor completely stops the period of time, must be greater than the specified time, this time is called engine residual rotation.

After the engine came to a complete stop, the entire monitoring and control room was silent. It was also dignified, there was a problem with the engine test, and everyone was uncomfortable.

Li Tianfeng broke this solemnity and quietness, and waved his hand: "Tune up the test record of our engine just now from the computer." ”

During the engine test, the computer will automatically record the records, which include a large number of records. Such as speed, power, fuel consumption and so on.

Li Tianfeng did not look at the speed and power number jù, but asked the test driver to directly fall out of the fuel consumption record, these numbers jù were called out, everyone found that the test software recorded in great detail, there is a curve graph, the horizontal axis is the time. From the start of the test, every second is a small bar, and the longitudinal axis is the fuel consumption. It looks clear.

Li Tianfeng pointed to the curve and said, "Do you see anything abnormal?" ”

Qiu Wenan and Sun Xiaoping both looked at it carefully, both of them saw the abnormality, Sun Xiaoping said: "Boss, this curve has been rising rapidly from the start of the engine, reaching the maximum at 36 seconds, and then it began to go down." ”

Qiu Wenan also said: "This is not normal. At 36 seconds, it's not the time when the engine is at its most powerful. The maximum engine output should be around 40 seconds. ”

Li Tianfeng nodded, "Adjust the output power number jù." ”

The test driver operated the computer and called up the power number of the engine test just now, which was also a detailed curve, and sure enough, the maximum output of the engine was in 39 seconds. Then the power output curve falls headlong until it stops at 43 seconds.

Seeing such a number record, Qiu Wenan and Sun Xiaoping glanced at each other and said in unison: "Cold hanging!" ”

Li Tianfeng nodded and said: "There is no doubt that there was a cold suspension in our test car just now, and now what we have to do is to find out the reason for this phenomenon." Only by finding out the cause can we prescribe the right medicine. ”

The so-called cold suspension, which is a professional term for aero engine testing, refers to the fuel supplied to the combustion chamber is too poor, the exhaust temperature is too low, the rotor can not be further accelerated, or the acceleration is too slow, and the scheduled test requirements cannot be met, this phenomenon is called "cold suspension".

Now that the problem has arisen and what the problem is, the key is to find out what the cause of the problem is.

Printing out all the various test numbers just now, we first carefully analyzed these numbers and analyzed them for a long time, but we didn't find a clue.

Li Tianfeng frowned slightly, personally participated in the problem analysis and search, Li Tianfeng also carefully looked at a large number of test runs, and he was also confused, and he couldn't find out where the problem was for the time being.

"Hopefully, it's not a problem with the engine itself." Li Tianfeng thought in his heart, if it is a problem with the engine itself, it will be more troublesome.

If Li Tianfeng has two engines now, to determine whether it is a problem with the engine itself, it is very simple, replace the engine that has a problem just now, replace it with another engine, and try again according to the test procedure just now, if there is no "cold suspension" phenomenon, it is the problem of the engine just now, if such a problem occurs, it is not a problem with the engine, it may be a problem with the test bench.

It can't be guaranteed that there is no problem with the test bench, the test bench is a very complex system, there are all kinds of control and operating systems, just those lines, those control components, sensors, etc., it is enough to make people's heads dizzy.

………

Aero engine test, a lot of employees in the test workshop are paying attention, just now, hearing a burst of test sound, everyone is refreshed, even a little excited, even, some employees secretly pray in their hearts, hope that their engine test is a complete success.

Now, the sound of not having a test car for so long came, and everyone was a little confused at first, and then gradually there were all kinds of speculations.

"Why is it so quiet?"

"yes, it seems like the test car has been stopped for a long time."

"Could it be that something is wrong?"

“……”

Among the employees in the test workshop, many of them were discussing these things because they were concerned about the test run, and some of them even wanted to go to see one and walked towards the test bench, but they were persuaded to go back by the employees on duty because they were still far from the yellow line area.

"Lao Ding, how is it?"

"Hey, I can't see the situation, I was persuaded to come back."

"So, could there really be something wrong with our engine during the test run?"

"yes, I'm so anxious."

“……”

The employees in the test workshop were anxious and worried, Li Tianfeng and others were not anxious, but Li Tianfeng knew that it was useless to be anxious at this time, the more this time, the more calm and clear-headed.

At this time, Li Tianfeng showed an excellent personal appearance, his head quickly calmed down, and he went through the problem in his mind like a movie, and went through the design of the engine again, Li Tianfeng nodded.

It is unlikely that there will be a problem with the engine, and it is very likely that such a problem will occur on the test bench. With this conclusion in his heart, Li Tianfeng felt the direction and a place to start.

So, Li Tianfeng said loudly: "Carefully check the fuel control part of the test bench, I estimate that eighty percent of the problem is here." ”

With Li Tianfeng's clear instructions, several technicians in the test workshop, and even Qiu Wenan and Sun Xiaoping took action in person, and Sun Xiaoping was basically responsible for the technical work of the test bench, and Sun Xiaoping immediately carefully checked the fuel control part of the test bench.

Time passes by minute, minute by minute.

Zhang Haiping was obviously worried, and seeing that there was no result after one or twenty minutes, he couldn't help but say: "Mr. Li, is there really no problem with our engine?" ”

For his own engine, at this time, Li Tianfeng showed full confidence, nodded and said: "Director Zhang, I have confidence in my engine, I estimate that the problem is on the test bench." ”

Hearing this, Zhang Haiping's heart was light, as long as there was no problem with the engine itself, he would be relieved, and Zhang Haiping was most concerned about this engine.

After more than half an hour of careful investigation, the cause was found, Sun Xiaoping happily walked over, and said with a happy face: "Boss, you are really like a god, there is really a problem with the fuel control part of the test bench, and there is a sensor that is loose and failing, and now the fault has been eliminated." ”

Li Tianfeng knew that the construction of the test bench was due to the construction of the test bench at the beginning, due to the construction of the project day and night, there may be some things that were not installed.

The problem is small, but it affects the test drive, and it also affects everyone's morale and confidence. Li Tianfeng said: "Mr. Sun, after the completion of this test run, spend a few days of hard work to carefully check the entire test bench and don't have problems again." ”

Sun Xiaoping said: "That's for sure, I will personally grasp this work." ”

Now, the fault is solved, so Li Tianfeng said: "Continue to test the car!" ”

Not long after, the test workshop sounded the sound of the engine test, this burst of sound came, the employees who were anxious in their hearts, their hearts were light, everyone knows, if there was really any fault just now, now it must be troubleshooting.

Next, the verification test of the engine was very smooth, and all the test items were completed in accordance with the test process regulations, which was perfect.

As a witness of this test, Zhang Haiping looked happy and said happily: "Mr. Li, congratulations!" ”

The test was completed, and there were no major problems, Li Tianfeng was happy in his heart, which means that at least in the design of the engine, there is no major problem, and his "TFWZ001" turboshaft engine design is just around the corner.

"Director Zhang, thank you for your consistent support to us, let's have two drinks tonight to celebrate."

Zhang Haiping, who was in a good mood, said happily: "Okay, no problem!" ”

Then, Li Tianfeng officially announced loudly: "This test is a complete success!" ”

Suddenly, the entire monitoring and control room became a sea of joy, everyone cheered for a while, and the test riders were even more happy and almost jumped up, Qiu Wenan and Sun Xiaoping glanced at each other, and found that each other's eyes were full of joy and excitement.

Even, Qiu Wenan took off his eyes and wiped his slightly moist eyes with a tissue.

………

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