The other side.

Xu Yang's efficiency is really not said.

Previously, she promised to complete the simulation and verification procedures of the digital control system within two days, but in the end, it really took only 46 hours.

From the outside, it is just two new signal input lines connected to the surface of the engine that has been mounted and connected to various pipes.

But in fact, on the basis of the program that has been written and packaged, a random signal input time delay algorithm is plugged in to simulate the occurrence of packet loss or high latency during data transmission.

"Thank you for your hard work."

Chang Haonan looked at Xu Yang, who had messy hair and a tired face, and thanked him for the first time.

"It's okay, you can't delay everyone's progress......"

For nearly two days before, Xu Yang was in a state of excitement at work, but now that he was relaxed at first, he was so sleepy that he couldn't even open his eyes, and he yawned and waved his hand:

"I won't participate in the later test sessions, I have to go back and catch up on sleep."

"If there is a problem with the simulation verification program of the table, just go to my dormitory and knock on the door...... But I think...... Should...... Won't ......"

A short sentence, and at the end of the sentence, the speed of speech slows down......

Of course, it is impossible to do such a big thing as an aero engine test run as much as eating and drinking.

After completing the last round of comprehensive inspection and confirming that the engine and test bench are properly prepared, Chang Haonan, Haiyide, Li Rongzai and other leaders of the turbofan 10 project and the leaders of the 624 Institute also need to sign and confirm respectively.

When the whole set of procedures is completed, it is already the morning of the next day when the aviation engine is officially launched.

As the technicians withdrew from the test chamber where the aerial platform was located, the thrust bench with the engine hoisted slowly moved along the slide rails to the exhaust cooler.

Compared with Chang Haonan when he first came here two years ago, the test station has been much optimized compared to the past.

The most obvious place is that a complete camera monitoring system is set up inside the test chamber.

In this way, everyone in the control room can intuitively see the real-time image of the engine test process, instead of judging the working situation of the aviation engine from the sound transmitted to the ears and the dry data displayed on the computer.

Also, by the way, you can save the video.

It can be regarded as satisfying Chang Haonan's thoughts.

When testing the turbojet 14, Chang Haonan has always wanted to leave some real image data, after all, it is the first domestic engine with independent intellectual property rights, and it must leave a mark in the history of the Chinese aviation industry.

Unfortunately, due to the lack of relevant conditions, it was not successful in the end.

During the entire bench test of the Vortex 14, only a few blurry photos were left.

……

"Mr. Chang, this order to start the test is still up to you!"

Hai Yide, who was standing in the first row, gently pushed Chang Haonan and pressed the latter to the chair behind the command platform in the control room:

"This ......"

In the presence of the chief engineer and the chief engineer, according to general practice, the command command should still be given to the former.

However, Haiyide's tone is quite firm, and he has obviously made plans for a long time.

At this kind of critical moment, if you get entangled for this kind of thing, it is not beautiful.

Therefore, he immediately calmed down, took a deep breath, and said in a calm tone by pointing into the microphone:

"The first test of the high-altitude platform of the prototype B0101 has been launched!"

When we tested the turbojet 14 and turbofan 9, neither of these two models could be considered "new" engines.

This is not the case with the Turbofan 10.

The B0101 has only been tested on the ground a few times under factory conditions.

Due to the limited conditions, the traditional start-up method was still used at that time.

This is now the first time electric start has been used.

Therefore, the testing process is naturally much more detailed.

"Roger, launch!"

After receiving the command, the operator pressed the engine start switch on the console in front of him.

On the display screen in the operation room, six sets of images with different angles are displayed.

Compared to the acousto-visual effect of air-gas starting, the electric starting process is almost silent.

While electric start uses the same air as the final step to push the starter, this process takes place where the camera can't see it.

Similarly, the N2 speed of the high-pressure compressor will continue to increase during this process, but it will also not be visible to the naked eye due to the obstruction of the outer two-stage fan.

"Turn off the turbo heater and front starter!"

Chang Haonan issued a second order.

The principle of the start-up process is somewhat similar to that of a car.

Even many small aviation engines are really started with the structure of a battery + P0 motor.

But for the turbofan 10 volume of the large thrust turbofan, this kind of small fight is definitely not good, so an external power supply is needed——

For example, a power cart, or an auxiliary power unit (APU) integrated into some aircraft.

In a bench test environment, these two components are not actually set up, but as a complete start-up process, they still need to be simulated in the test system.

On another display in the control room, the parameters captured by the sensors are also displayed one by one.

Soon, the N2 revs reached the ignition supply line.

"Combustion chamber, ignition!"

At this moment, the engine finally had a bit of a noticeable response.

As the operator rotates the start handle, the Hangfa ignition nozzle creates a high-pressure electric spark in the combustion chamber, igniting the atomized fuel and the high-pressure air mixture that has just been fed into the combustion chamber by the compressor.

A burst of flame emerged from the tail vent, but only for a moment.

It is not difficult to tell from the sound that the working speed of the engine is steadily increasing.

At this point, the engine is officially in working condition.

From Chang Haonan's side, a burst of warm applause broke out-

For an engine that is actually installed on an aircraft, the entire start-up process is done automatically by the flight control system.

However, it is a high-risk subject for the engine testing process.

From a mechanical point of view, the engine is a transient process from static to dynamic, involving a variety of non-periodic changes with huge fluctuations.

From the perspective of control, it is an open-loop process, and if there are loopholes in the control logic or algorithm, the working state is likely to be unable to converge.

Therefore, it is definitely a good start to start smoothly.

Taking advantage of this, he also took advantage of the situation to leave the seat in front of the podium.

There are hundreds or thousands of links in the high-altitude test, and naturally there are personnel who are specially responsible for issuing command orders.

Chang Haonan, the chief designer, should focus on the test data.

The reason why the first three steps of the command is still to take into account a symbolic meaning.

The engine's slow-running thrust eventually stays at 145 kgf and does not change.

This number made many engineers who came into contact with turbofan 10 for the first time at the 624 Institute show a slightly surprised expression.

After all, the plane did not have a gearbox.

The high-temperature and high-pressure gas must be exported through the tail nozzle, and the energy generated must also be converted into thrust.

And the slow state itself is not to "push" the aircraft, but only to maintain the minimum working state of the engine to work stably.

From this point of view, the smaller the number that can be stabilized, the better.

The number 145 is already a very unnatural level.

"Mr. Chang, how did your engine run at such a low working condition, and there was really no risk of stalling?"

Jiang Fuhe leaned next to Chang Haonan and asked in a low voice.

The latter slowly walked to the front of the screen displaying the test data, looked at the numbers on it, and replied at the same time:

"That's one of the benefits of full-authority digital control technology."

"Although the minimum steady-state thrust is large or small will not directly affect the performance, and I have not specifically optimized this parameter, the electronic control system can inherently bring higher control accuracy and response speed, and it is also conducive to the fine adjustment of the working state."

"It's kind of unintentional......"

(End of chapter)