Chapter 629 Turbofan 10, ignition successful!
The other side.
Xu Yang's work efficiency is really hard to say.
Previously, she promised to complete the simulation verification program of the digital control system within two days, but in the end it only took 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 pipelines.
But in fact, based on the program that has been written and packaged, a random signal input delay algorithm is plugged in to simulate packet loss or high delay during data transmission.
"Thanks a lot."
Chang Haonan looked at Xu Yang, who had disheveled hair and a tired look on his face, and said a special thank you for the first time.
"It doesn't matter, we can't delay everyone's progress..."
Xu Yang had been in an excited working state for nearly two days. Now that he relaxed, he was so sleepy that he could hardly open his eyes. He yawned and waved his hands:
“I will not participate in the subsequent testing sessions. I have to go back and catch up on some sleep.”
“If there is a problem with the simulation verification program of the station, just go to my dormitory and knock on the door... But I think... it should... not..."
After completing the final round of comprehensive inspections and confirming that the engine and test bench are properly prepared, the heads of the Turbofan 10 project such as Chang Haonan, Hai Yide, and Li Rongzai and the leaders of the 624 Institute still need to sign for confirmation respectively.
However, Haiyide's tone was quite firm, and he had obviously already made plans.
In this way, everyone in the control room can intuitively see the real-time images during the engine test, instead of just judging from the sounds reaching their ears and the dry data displayed on the computer as before. The working conditions of aviation development.
The most obvious thing is that a complete camera monitoring system is set up inside the test chamber.
Unfortunately, it failed in the end due to lack of relevant conditions.
While testing the Turbojet 14, Chang Haonan always wanted to leave some real image data. After all, it is the first domestic engine with independent intellectual property rights, and it will definitely leave a mark in the history of China's aviation industry.
It was a short sentence, but the speed of speaking slowed down at the end...
Hai Yide, who was standing in the front row, gently pushed Chang Haonan and pressed the latter onto the chair behind the podium in the control room:
Of course, something as big as aero-engine test-running cannot be done as easily as eating and drinking.
"this…"
It can be regarded as a wish that can satisfy Chang Haonan.
The entire bench test process of Turbojet 14 only left a few blurry photos.
Compared to when Chang Haonan first came here two years ago, the test station today has been much optimized compared to the past.
As the technicians evacuated the test cabin where the high-altitude platform was located, the thrust platform holding the engine moved slowly along the slide rail to the exhaust cooling device.
Moreover, you can also save the video by the way.
At such a critical moment, it would be unsightly to get entangled over this kind of thing.
By the time the entire procedure is completed and the aviation engine is officially launched, it will already be the morning of the next day.
“Mr. Chang, it's up to you to give the order to start testing!”
In the presence of the chief engineer and chief division, according to general practice, the command command should still be given to the former.
Hence, he immediately calmed down, took a deep breath, pointed into the microphone and said in a calm tone:
“The first test of prototype B0101 high-altitude platform is started!”
When I tested the turbojet 14 and turbofan 9 before, those two models could not be considered “new” engines.
Which is not the case with Turbofan 10.
This B0101 machine has only been tested on the ground a few times under factory conditions.
Due to limited conditions, the traditional startup method was still used at that time.
At the moment this is the first use of electric start.
Hence, the testing process is naturally much more detailed.
“Received, start!”
After receiving the order, the operator pressed the engine start switch on the operating platform in front of him.
The display screen in the operating room shows six groups of images from different angles.
Compared with the sound and light effects of air-gas starting, the electric starting process is almost silent. Although electric starting still uses air in the final step of pushing the starter, this process occurs in places where the camera cannot see it.
Similarly, the N2 speed of the high-pressure compressor will continue to increase during this process, but it cannot be observed by the naked eye because of the obstruction of the two-stage fans outside.
“Switch off the turbo heater and front starter!”
Chang Haonan issued the second instruction.
The principle of the aviation engine starting process is somewhat similar to that of a car.
Even many small aviation engines are started with a battery + P0 motor structure.
But for a large-thrust turbofan of the size of Turbofan 10, this kind of trivial work is definitely not feasible, so an external power supply is required—
For example, a power supply vehicle, or an auxiliary power system (APU) integrated in some aircraft.
In the bench test environment, these two components are not actually set up, but as a complete startup process, their existence still needs to be simulated in the test system.
On another monitor in the control room, various parameters captured by the sensor have also been displayed one by one.
Soon, the N2 speed reaches the ignition fuel supply line.
“Combustion chamber, ignite!”
At this time, the engine finally had some obvious response.
As the operator rotates the starting handle, the aircraft engine ignition nozzle generates a high-voltage electric spark in the combustion chamber, igniting the atomized fuel and the high-pressure air mixture that has just been sent into the combustion chamber by the compressor.
A faint flame emerged from the tail nozzle, but it only lasted for a moment.
It is not difficult to tell from the sound that the engine's operating speed is steadily increasing.
At this point, the engine has officially entered working condition.
A burst of warm applause erupted from Chang Haonan's side—
For an engine that is actually installed on the aircraft, the entire starting process will be completed automatically under the action of the flight control system.
But for the engine testing process, it is a high-risk subject.
From a mechanical point of view, the engine's transition from static to dynamic is a transient process, involving various non-periodic changes with huge fluctuations.
From a control perspective, it is an open-loop process. If there are loopholes in the control logic or algorithm, the working state may not converge.
Hence, a smooth start is definitely a good start.
Taking advantage of this moment, he also left his seat in front of the podium.
There are hundreds or even thousands of links in the high-altitude platform test, and naturally there are personnel specifically responsible for issuing command commands.
Chang Haonan, the chief designer, should focus on testing data.
The reason why I directed the first three steps is because of a symbolic meaning.
The idle thrust of the engine finally stayed at 145 kilograms of force and did not change.
This number made many engineers from the 624 Institute who were exposed to the turbofan 10 for the first time show slightly surprised expressions.
After all, airplanes don't have gearboxes.
The high-temperature and high-pressure gas must be output through the tail nozzle, and the energy generated must also be converted into thrust.
The idle state itself is not to "propel" the aircraft, but is just to maintain the minimum working state of the engine for stable operation.
From this perspective, the smaller the number that can be stabilized, the better.
The number 145 is already extremely high.
“Mr. Chang, how do you keep your engine running at such a low operating condition? Is there really no risk of stalling?”
Jiang Fuhe approached Chang Haonan and asked softly.
The latter slowly came to the screen displaying the test data, looked at the numbers on it, and replied at the same time:
“This is one of the benefits of full-authority digital control technology.”
"Although whether the minimum steady-state thrust is larger or smaller 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, which is also beneficial to work. Fine adjustment of status.”
“It's just an accident…”
(End of this chapter)
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