At the critical moment of the test run of the first verification machine, Li Tianfeng was of course present, in addition, Qiu Wenan and Sun Xiaoping were also present, and they wanted to see this very commemorative moment with their own eyes.

This time, Zhang Haiping came over early, arrived in Songzhou yesterday afternoon, stayed at the State Guest Hotel, and arrived at Tianfeng Technology Company early this morning, at this time, next to Li Tianfeng.

As soon as you are ready to go, you can start the test drive!

A hurried alarm bell rang throughout the test hall, and then, a whistle sounded, and unrelated personnel had to immediately evacuate the scene and go beyond the yellow line.

In the yellow line area in front of the inlet of the test workshop, no one can be in the yellow line area behind the exhaust duct, the relevant staff of the test workshop are evacuated, the door between the test workshop and the monitoring and control room is closed, and the relevant staff are in place in the monitoring and control room.

Li Tianfeng and others were also monitoring the control room, and through the huge, thick glass, they could clearly see the engine located on the test bench of the test workshop.

A few minutes later, the alarm bell rang for the second time!

This alarm bell rang again throughout the test workshop, hearing this second alarm bell, the employees of the test workshop were inexplicably excited in their hearts, and the exciting test was about to begin.

The alarm bell rings for the third time!

As the alarm bell rang three times, Li Tianfeng said angrily: "Start the test drive!" ”

The on-site test commander also shouted loudly: "Start the test run!! Test start-up !! ”

Several test drivers, who had already made a qiē preparation, had already sat in front of the test control platform, and when they heard the order, one of the test drivers pressed the test start button with a slight excitement in his heart, and started the first procedure of the test run, and the test start.

The so-called test start. It is the starter of the test bench that drives the engine and accelerates the engine rotor from a stationary state to a specified slow state.

On the test bench, the engine is driven by the starter, and the rotor part begins to rotate, gradually accelerating, and gradually reaches the specified slow state. The speed of the engine rotor can be clearly seen on the control screen of the control platform.

Reach the specified slow state, continue to run for a few minutes, the engine is in good condition, the test driver responsible for monitoring the engine test status said loudly: "The test start is normal!" ”

"Normal!"

"Normal!!"

"Normal !!"

These test drivers looked at the number in front of them, and reported loudly one by one, and a loud voice spread throughout the entire test monitoring and control room. Qiu Wenan and Sun Xiaoping glanced at each other, and they could clearly see the joy between the two, the start was good, and the test start was normal.

Li Tianfeng was also slightly happy. The test start is normal, which means that there is no problem with the engine assembly and the engine can run normally and freely.

The on-site test commander said loudly: "Fake driving!" After speaking, he also made a special command gesture for the test run.

Aero engine test, generally speaking, the noise is very loud, although the monitoring and control room has taken sound insulation measures, but it is very close to the test engine, generally speaking. The noise of the monitoring and control room will exceed 85 decibels, and the test command has a special command gesture. If you don't use gestures to command, sometimes the tester may not be able to hear clearly.

Hearing the voice of the conductor, the test driver immediately began to fake the start, and the engine immediately quickly entered the state of fake starting.

The so-called fake start refers to the operation of the engine driven by the starter, which only supplies fuel to the combustion chamber without ignition.

"Normal!"

"Normal!!"

"Normal !!"

The loud voices of several test drivers came again. Everyone's expressions were happy again, Li Tianfeng could clearly see the engine that had entered the state of fake driving through the wide thick glass.

After the engine was started and the pretended driving state was normal, the test commander shouted loudly: "Ignition." Enter the working state of slow train. ”

Hearing the order, the test driver pressed the button, the engine ignited successfully, and began to work, gradually emitting a sharp and steady sound, the sound gradually increased, and in the monitoring test room, everyone felt that the sound was deafening, and if they didn't speak loudly, they really couldn't hear clearly.

Slow train state and cruising working state, rated power state, maximum working state, etc. are all different working states of aero engines.

The test run of a new aero engine generally follows the principle of gradual progress, such as the start just now, the fake start, and the current slow train working state. The so-called slow train working state is the minimum power state of the engine to work reliably and steadily, in general, the speed is 25% to 30% of the maximum speed, and the power is 3% to 5% of the maximum power.

A few minutes after the slow run, the engine starts a series of test runs according to the test process, such as cruising working state, rated power state, and also carries out equivalent power start, cold start, hot start, warm-up, cold engine and so on.

"Normal!"

"Normal!!"

"Normal !!"

What Li Tianfeng heard was a loud "normal" sound, such a voice, how pleasant and comfortable it sounded.

As the chief designer of this engine, Qiu Wen'an is the most excited and happy one, which can be clearly seen from the look on his face.

Zhang Haiping is also very happy, this time to come, it is really worth the trip.

Aero engine verification test is a total verification of its design, manufacturing process, materials and other aspects, only the engine verification test is normal, it means that the engine design, manufacturing process, materials and other aspects are no problem, it is feasible.

Once the engine fails to test and there is a problem, it is necessary to analyze the problem and find out the cause, and even directly reflect some defects and problems in the design, or some problems in the selection of materials, or some problems in the parts manufacturing process and aircraft assembly process.

Now, the engine has been normal after so many subjects of verification and testing, no wonder everyone is very happy, even Qiu Wen'an, the general design is happy for a while, so many test subjects have been completed, announcing that the first verification test is about to come to an end.

Li Tianfeng was also happy in his heart, but Li Tianfeng was not as obvious as Qiu Wen'an and Zhang Haiping, because Li Tianfeng knew that the real test was about to begin.

In a series of test runs just now, the maximum working state of the engine is the rated working state, which is far from reaching the maximum power working state.

When the engine reaches the maximum power working state, all parts will withstand the extreme test, whether it is the force test or the working environment test, it will reach the limit.

For example, in the maximum power working state, the turbine rotor, one of the hot parts, will output the maximum power, its force will also reach the maximum state, and the temperature before the turbine will also reach the maximum.

In such a high temperature and high stress state, it is a strict test for turbine blades, turbine discs and other parts.

We all know that as the temperature increases, the strength of the metal will decrease, and when it reaches thousands of degrees Celsius, some metals will be red and soft, and the strength will be completely different from that at room temperature.

The pre-turbine temperature of the "TFWZ001" turboshaft engine is more than 1,000 degrees Celsius, and in such a high-temperature environment, the turbine blades, turbine discs and other parts have to withstand huge forces, outputting 1800KW or even more huge power, and its test range can be imagined.

After the completion of this series of test subjects, the real test test also began, the test commander found that he had been in a stable state of mind, and suddenly felt a little nervous, and couldn't help but glance at Li Tianfeng, and cast a look at Li Tianfeng.

Li Tianfeng understood the meaning of this look, so Li Tianfeng nodded.

Seeing this, the test commander waved his hand, made a gesture, and shouted loudly: "Test run in the maximum working state!" ”

Hearing the command, the test driver started the engine again, and gradually pushed the push rod out, until the push rod was pushed to the extreme, pushed to the maximum distance, the engine started, and gradually accelerated, and the sound of a sharp and steady turboshaft engine test sounded in everyone's ears again.

In the monitoring and control room, a series of instruments and meters monitor the status of the engine, and on several LCD screens, all kinds of parameters are clear, and the number of working conditions of the engine has been climbing and changing rapidly.

Such as the engine speed, output power, fuel consumption, etc., as the engine speed becomes faster and faster, these numbers are like dancing, fast flashing, rapid changes.

In the entire monitoring and control room, there is only the sound of the engine working, everyone looks quiet, no one speaks, everyone's eyes are all staring at these instruments, these LCD screens, looking at these numbers.

Just now, one by one, the test subjects were completed smoothly, and one qiē was normal, Qiu Wenan and the others were still excited and happy in their hearts, and at this time, everyone was attentive and looked at these numbers with full attention.

From the start of the engine, the power has been climbing, from the 0.3 rated power state to the 0.5 rated power state, to the cruising working state, to the 1.0 rated power state, and then to the maximum power state.

Looking at the engine over the rated power state, the output power of the engine on the LCD screen reached 1800KW and then continued to rise, 1850KW, 1900KW, 1950KW......

Watching the power number climb, everyone's whole heart rose, and they almost reached the door of their voices, and if they raised it a little more, they would jump out of the door of their voices.

At this critical moment, suddenly, Li Tianfeng's face changed slightly, and the sound of the engine working also changed, and there was an obvious abnormality.

As the general designer of this engine, Qiu Wen'an naturally has a clear understanding of the engine performance and the test run, and at this time, Qiu Wen'an's face changed greatly.

Although Zhang Haiping was not so professional, seeing that the faces of the two of them had changed significantly, he couldn't help but feel inexplicably nervous, and said in his heart, it's broken, it's broken, something must be wrong.

…………

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