Chapter 105 High Altitude Platform Simulation
Due to the long distance between Shengjing and Fucheng, the person responsible for transporting the prototype aircraft was a basic Y-8 model with a larger range but without a modified airtight cargo compartment.
So Yan Zhongcheng, Chang Haonan and others had to take another Boeing 737 and arrived in Fucheng a little later.
Nanjiao Airport was still a military airport closed to civil aviation at this time, but as staff 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 warehouse and preparing to load it onto a flatbed trailer next to it. above.
The plane came to a slow stop at the end of the runway, and a ramp truck slowly drove over.
Maybe it’s because passenger planes don’t land here very often, so 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.
“Huh…”
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 the 29th base, 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 a little uninterested and are still worried about the manufacturing process?"
It's Yao Mengna.
She had just been waiting at the door of the cabin.
Chang Haonan shook his head:
"That's not the case. 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 operating conditions of the Turbojet 14 and the problem that the improved inner pylon may cause the engine to stop after launching the PL-8 missile?"
One sentence The words made Chang Haonan take back the steps he had just wanted to take.
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 these two things, or the underlying root cause. Probably 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.
The result was nothing.
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 heart 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. According to the order of execution, they are calibration test, air performance test, startup and restart test, thrust transient test...”< br>
“The most important thing here is item 8. The intake distortion test, which simulates the situation when surge may be induced, is a key link in determining the success of our engine improvement this time, so I decided Comrade Xiao Chang will be responsible for conducting it..."
"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 time you can design the conditions for the intake distortion test first..."
"After completing the eighth item, we need to divide into two, and one team will continue to carry out the second half. Some tests, especially plateau and high and low temperature start-ups, must produce the most rigorous and detailed data. Another team went to Yanliang to prepare for the aerial 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 the experience and lessons learned by Yan Zhongcheng himself 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 almost in 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 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 then 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 actuality 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 see..."
"As the engine speed continues to increase, the thrust curve finally stabilizes at..."
Engineer in front of the computer screen His eyes widened involuntarily.
“Pa-ta——”
The pen in his hand fell to the ground.
The crisp sound also attracted the attention of other people nearby.
"The thrust of the bench...73.5KN!"
Additional updates will be made in the afternoon as usual
(End of this chapter)