The starting process of gas turbine and aero engine is basically the same as the pneumatic process of cars and motorcycles that we are familiar with, but in fact it is completely different!

What is pneumatics like for cars and motorcycles?

When the engine reaches a certain speed, the engine's fuel supply system begins to inject fuel, and the engine starts successfully, usually the process is one second or less than a second.

However, the start-up process of gas turbines and aero engines is more cumbersome.

Like the engines of automobiles and motorcycles, aero engines and gas turbines cannot rely on themselves to work, and also need external energy to help start, and after a pre-set starting process, the main engine can enter a stable working state. First of all, the starter drives the engine to gradually enter the slow state, when it reaches the slow state, the fuel supply system begins to supply fuel to the engine, and then the ignition, and then slowly increases the speed of the engine to the normal speed.

There are many types of starters, generally compressed air, in the early years, there was no APU system on the fighter, and the compressed air carried was only enough for the aircraft to start in the air about twice, after having the APU system, the APU system could continue to provide compressed air, but it could be started several more times.

With the injection of compressed air, the blades of the RB211 gas turbine began to rotate slowly, as the speed of the turbine blades became faster and faster, the unique sharp whistling sound of the turbine became clearer and clearer, harsh, but Wang Dazhi seemed to be unmoved, staring at the engine speed displayed on the screen in front of him, when the engine speed finally reached 3250 rpm, Wang Dazhi pressed the call button of the walkie-talkie: "Ignition!"

"Ignition!"

With Wang Dazhi's order, a peculiar sound came from the inside of the gas turbine, and soon, bursts of heavy green smoke came out of the exhaust port of the gas turbine, and the color of the green smoke gradually faded, and the speed of the gas generator rotor was also increasing, and the ignition was successful!

The ignition of the gas generator was successful, but Wang Dazhi's face was still tense.

Wang Dazhi is not at all worried about the quality of his own gas generator, but he is a little worried about whether the gas turbines provided by Hangzhou Steam Turbine and Harbin Steam Turbine can work smoothly.

It is not only Wang Dazhi who is not at ease, but also the special representatives of the 703 Institute, Huaqing University, Hangzhou Steam Turbine, Harbin Steam Turbine, the military, and the Planning Commission...... All the units and leaders who participated in this project and had high hopes for this project are either staring at the screen displaying various data in front of them at this moment, or staring at the machine that has emitted a huge roar in front of them, and they are silently praying in their hearts: we must succeed, we must succeed......

Suppressing this anxiety in his heart and staring at the screen in front of him, Wang Dazhi finally gave the order that everyone was waiting for: "Connect!"

"Connected!"

..............................

Chen Geng was shaken by Ding Ruoyan, normally, no one dared to wake him up when he was asleep, but today's situation was very different, when Chen Geng looked at Ding Ruoyan with sleepy eyes, he saw a face that was extremely excited.

"What's the matter, why are you so happy?" Rubbing his eyes, Chen Geng asked puzzled.

Ding Ruoyan couldn't be excited: "Wang Dazhi just called, our gas turbine trial operation has been successful!"

"Oh......" Chen Geng, whose head was still foggy, yawned, but in the next second, his eyes widened suddenly, and the sleepiness in his eyes disappeared without a trace in an instant: "What did you say?!"

Ding Ruoyan knew Chen Geng's mood too well at the moment, just now, when the nanny on duty called herself, wasn't she also excited, nodding again and again: "You heard it right, our gas turbine trial operation was successful!"

"Was the trial run successful? really?"

"Really," Ding Ruoyan nodded vigorously: "Didn't you call Wang Dazhi before going to bed last night and tell him to tell you as soon as the results come out." ”

The third test of the RB211 gas turbine body, such a big thing, of course, Chen Geng is highly concerned, just because of the time difference between China and the United States, when the test is completed, it is already five o'clock in the morning, considering that the next day will go to the city government to "sit on duty", Chen Geng had to repeatedly tell Wang Dazhi that he must tell himself as soon as the results come out - of course, if the results are not so satisfactory, don't tell yourself, after all, it is still very annoying to wake yourself up in the early morning to listen to bad news.

"So, the test went well?" Looking at Ding Ruoyan expectantly, Chen Geng asked cautiously.

"It's very smooth," Ding Ruoyan kept nodding: "It's very smooth, the ignition is successful, after the ignition, the whole machine has been put into trial operation for half an hour, the whole system is all right, now Wang Dazhi They have turned off, and are inspecting all parts of the system, if there is no problem, the next thing is 10 hours in a row, 20 hours in a row and 150 hours of trial operation, as long as the 150 hours of trial operation is no problem, you can officially enter the national test stage, Wang Dazhi said, he is very confident in the next test. ”

Speaking of this, Ding Ruoyan couldn't control herself anymore, and jumped up happily, as a Chinese, she was happy that the country had once again broken the blockade of foreign countries in the field of core technology.

The RB211 gas turbine of COMAC Group is a national key project, after the success of the initial trial operation, according to the standard, it will be 10 hours, 20 hours of trial operation, until 150 hours, this stage is called the "factory test" stage, when the "factory test" stage is over, it will officially enter the national test stage, and only through the national test, will officially get the model certificate and mass production license, enter the mass production stage.

Of course, as a special material strictly controlled by the state, although this gas turbine is produced by COMAC and many units in the United Nations, it is not up to COMAC to sell it to anyone, and it can only be approved by the state - this is also a common practice in the world, for example, our country wants to purchase LM2500 gas turbine units from General Dynamics, but it is not after we negotiate with General Dynamics, it must be approved by the US government- As for the reason, it's very simple, this thing belongs to the strategic level of materials and strategic technology controlled by the state, and it belongs to the treasure of the "waist pole" level.

Since the word "strategy" is stained, it is naturally highly controlled by the state.