Chapter 105 High altitude platform simulation

Due to the long distance between Shengjing and Fucheng, the prototype aircraft was transported by a basic Y-8 model with a longer range but without a modified airtight cargo compartment.

Therefore, Yan Zhongcheng, Chang Haonan and others had to take another Boeing 737 and arrived in Fucheng a little later.

At this time, Nanjiao Airport was still a military airport closed to civil aviation, but as employees of the aviation industry system, their planes could naturally land here directly.

Through the porthole, Chang Haonan saw that the Y-8 that had taken off before was parked next to the runway. A group of people in camouflage uniforms were unloading the engine from the cargo warehouse and preparing to load it onto a flatbed trailer next to it.

The plane came to a slow stop at the end of the runway, and a ramp truck slowly drove over.

Perhaps because passenger planes don't land here often, it took the driver several attempts to get it right.

After the hatch opened, Chang Haonan did not get up in a hurry as usual.

It wasn't until everyone else had left that he walked out of the plane at the end of the team.

"call……"

He took several deep breaths in succession, feeling the familiar smell in the air.

"Fucheng, we are back again..."

Standing at the top of the gangway, Chang Haonan gazed at the green mountains in the distance with some feeling.

This was also the first time he came to Fucheng after his rebirth.

Although it is not Base 29, it is still somewhat touching.

However, this emo mood did not last long.

A familiar voice quickly woke Chang Haonan out of his memories.

"Why do I feel like you, junior brother, are not very interested and are still worried about the manufacturing process?"

It's Yao Mengna.

She had just been waiting at the cabin door.

Chang Haonan shook his head:

"That's not true. With the improved surge margin of the turbojet 14, as long as nothing happens like swallowing water and hitting birds, the reliability will definitely be no problem."

Of course, he also told Yao Mengna that the engine test flight conditions were not stable enough.

I didn't expect the other party to give any answers. I mainly chatted while waiting for the results in the calculation center.

But surprises always appear unexpectedly.

"Do you think there is a connection between the unstable working conditions of the Turbojet 14 and the problem that the inboard pylon they improved before firing the PL-8 missile may cause the engine to shut down?"

This sentence made Chang Haonan take back the steps he had just taken.

The days of improving the compressor were really dark, and missile launch was really a small problem compared to the turbojet 14, so if Yao Mengna hadn't mentioned it, he would have almost forgotten about it.

"Tell me what you think?"

"I don't have a complete idea, but I just feel that there should be a connection between the two things, or the underlying root cause may be the same."

Yao Mengna shrugged.

"Well……"

Chang Haonan tried to continue thinking along this line of thinking, but for a while he still couldn't find any clue.

"Anyway, let's go there first, don't let Mr. Yan and the others wait too long." Yao Mengna said and stretched out her hand, as if she wanted to grab the wrist of the person next to her, but she still hesitated for a moment in the middle of the action.

It turned out to be empty.

Chang Haonan, who didn't notice the little movement of the senior sister, quickly walked down the gangway and caught up with the crowd not far ahead.

Yao Mengna had no choice but to curse in her mind for her indecisiveness at that moment while trotting after the other party.

A group of people got into two blue and white Coasters parked near the airport.

At the same time, the engine installation has also been completed on the other side.

The entire convoy began to drive towards Institute 624, the Gas Turbine Research Institute where Liu Zhenxiang worked before.

Due to time constraints, Yan Zhongcheng took out his notebook on the road and began to assign tasks to the core members in the car with him.

"Comrades, our high-altitude platform test has a total of 13 tasks. The order of execution is calibration test, air performance test, start-up and restart test, thrust transient test..."

"The most important thing here is item 8. The intake distortion test, which simulates the situation that may induce surge, is a key link in determining whether our engine improvement is successful this time, so I decided to let Comrade Xiao Chang do it. Responsible for carrying out..."

"Comrade Xiao Chang, the contents of the first six tests have little to do with our improvements this time. Although they still have to be done according to regulations, the process should be faster. During this period, you can first set the conditions for the intake distortion test. Designed..."

"After completing the eighth item, we need to split into two. One team will continue to conduct the second half of the test, especially the plateau and high and low temperature starts. They must produce the most rigorous and detailed data, and the other team will go to Yan Liang, prepare for the air platform test..."

Under Yan Zhongcheng's orderly command, when the group arrived at their destination, they already had a clear understanding of their tasks for the next period of time.

With the help of the staff of the 624 Institute, the first prototype of the improved turbojet 14 was fixed on the thrust bench of the SB101 high-altitude platform that night.

Due to Yan Zhongcheng's own experience and lessons gained at the cost of half his life, no one is allowed in the test cabin during the aviation engine test.

Therefore, Chang Haonan could not directly see the working scene of the turbojet 14 that he had improved.

Fortunately, the data is read in almost real time.

The first step of the test, the high-altitude platform calibration test, was quickly completed.

The thrust bench was then sent into the test chamber.

The tail nozzle of the turbojet 14 engine is aimed at the exhaust cooling device at the rear.

The air supply and air extraction systems of the high-altitude platform started working at the same time. The high-speed airflow provided by the two DA3500 compressors was cooled and sent into the pressure stabilizing chamber.

The engine started successfully, and the scream of the turbojet engine could be heard even in the operating room outside the test chamber.

Air performance testing begins.

The first thing to measure is naturally the standard bench thrust.

"Sea level altitude, incoming flow angle of attack 0°, incoming flow speed Mach 0.4, ready to start testing."

The engineer almost instinctively began to read out the test conditions according to the process.

This should have been a rather boring step for an engine whose main improvement was to increase surge margin.

Because everyone is too familiar with the envelope of the turbojet 14.

Almost everyone here can draw it with their eyes closed.

The standard bench thrust should be 69.6KN.

Although the design goal of the turbojet 14 is an engine with a thrust-to-weight ratio of 6.5, in reality the thrust-to-weight ratio calculated in accordance with the national military standards has always been around 6.2-6.3.

Considering the current status of aviation power in our country, there is nothing unacceptable, as long as the stability is acceptable.

The engineer who had just read out the test conditions was thinking about this when the thrust data read by the thrust bench appeared on the screen in front of him.

"Let me take a look..."

"As the engine speed continues to increase, the thrust curve finally stabilizes at..."

The engineer in front of the computer screen couldn't help but widen his eyes.

"pat-"

The pen in his hand fell to the ground.

The crisp sound also attracted the attention of other people nearby.

"Bench thrust...73.5KN!"

Extra updates will be added in the afternoon as usual