Start the test run!!

With an order, the test driver presses the start button, and the test bench starter drives the engine to start working, and the engine output power climbs rapidly to reach the slow state, and continues to climb to reach the rated power state.

After stabilizing the rated power state, there was no other sound in the entire monitoring and control room except for the test sound of the engine, and everyone's eyes were either looking at the instrumentation or looking at Li Tianfeng, because everyone knew that the ice swallowing test was about to begin.

If Li Tianfeng was not here, the test commander would definitely have given the order, but now, the test commander looked at Li Tianfeng, and Li Tianfeng nodded, signaling that at this time, the ice swallowing test could be carried out.

Spray crushed ice!

The tester pressed the button, and suddenly through the huge glass, some crushed ice could be seen sprayed out towards the working engine.

Soon, the ice and snow weather was simulated around the entire test bench, and some broken ice was sucked into the engine and swallowed into the engine through the engine air intake.

The rated power state of the engine works, the speed of the engine reaches tens of thousands of rpm, such a high speed, if these broken ice hit the blades of the engine, the light will cause damage to the blades, and the heavy will cause damage to the whole engine.

When designing, these must be fully considered, obviously, this engine has been designed with this consideration, when the air flow is sucked in from the outside, it is basically parallel to the blades, and when the crushed ice is sucked in, it also follows the air flow and does not hit the blades.

Theoretically, this is the case, but in practice it will not be like this, which has to be known through experiments, so there is the current ice-swallowing test.

The ice-swallowing test was carried out for three minutes, according to the test outline. This was enough time, so the test commander waved his hand and shouted, "Stop spraying crushed ice!" ”

Stop spraying!

Seeing the command instructions, the test driver pressed the button, and the ice crushing spraying stopped. The engine continued to work without stopping, and after a few minutes of continued operation, the engine began to stop.

The stop button is pressed, the engine turns off, the sound gradually weakens, and gradually, the engine spins slower and slower, until it finally comes to a complete stop.

Ice Swallowing Test Complete!

The test was done. However, whether the engine is normal after this test must wait for the engine to be transported back to the final assembly workshop for disassembly, and then inspected.

At this time, the engine has stopped, and the entire monitoring and control room is quiet, and a pin can almost be heard on the ground. Everyone's eyes looked through the glass at the engine on the test bench.

Li Tianfeng waved his hand and said, "The ice swallowing test is over." The engine is transported back to the final assembly workshop for disassembly as required. ”

Next, this engine is transported back to the final assembly workshop for disassembly, because it is an ice-swallowing test, mainly to check the compressor part, and it is relatively easy to disassemble, just to disassemble the parts. The compressor part was removed and the compressor part was carefully inspected, especially the axial flow impeller blades and centrifugal impeller blades.

Ice swallowing test test is often more prone to problems. If the engine blades are damaged, that's a big problem, at least because of the design, and it's a safety issue.

If the engine has such a safety problem, it must not be mass-produced, because it has a hidden danger, in case the helicopter is installed, in case the helicopter works in the ice and snow environment, in case the blade is injured, the consequences are unimaginable.

After the engine was required to complete the decomposition in the assembly workshop, Li Tianfeng personally focused on the axial flow impeller and centrifugal impeller.

With white gloves and a small flashlight, Li Tianfeng looked very carefully, and did not let go of the slightest "clues".

Qiu Wenan was naturally next to him, and he also took a closer look at the relevant parts, and after reading it, Qiu Wenan was very happy, "Boss, the ice swallowing test is very ideal, and our engine safety is very high." ”

Li Tianfeng nodded, very satisfied with this result, Li Tianfeng said: "The ice swallowing test is successfully completed, and the next step is the more testing sand swallowing test." ”

As a designer, Qiu Wenan naturally knew that the sand swallowing test of the engine was more testing.

We know that the air enters the engine at room temperature, through the compression of the engine, the air temperature rises quickly, and when the air flow comes out of the compressor part, the temperature has risen several times, and after entering the combustion chamber, with the combustion of fuel, the temperature is as high as two or three thousand degrees.

The melting point of the ice is zero degrees, the temperature above zero degrees will gradually melt, the higher the temperature, the faster it will melt, the crushed ice entering the engine, may be compressed with the air is compressed, the air temperature rises, in the compressor has been completely melted.

And the dust is different, no matter how high the temperature is, it can't melt, even if it is two or three thousand degrees, it can't melt, after the sand and dust is sucked in, it will accelerate with the compression of air, and the speed can reach the speed of sound, such a high speed, once it hits the blades of the engine, the consequences are very severe.

Therefore, the next sand swallowing test is more challenging, of course, in the design of the engine, the danger of once the engine inhales sand and dust, but the design is theoretical, in fact, the inhalation of sand and dust will not cause damage to the engine, it is difficult to say.

Qiu Wenan nodded approvingly and said: "Boss, the sand swallowing test is extremely challenging, and our engine must be qualified in this aspect of safety performance." ”

Li Tianfeng nodded.

Two days later

Test workshop.

The engine has been tested and reassembled and is now on the test bench and ready for the challenging sand swallowing test.

As soon as it was ready, several test drivers were slightly nervous, and even one of the test drivers had sweat in their palms, quietly wiped them, and then held the joystick.

Start your test drive!

Seeing Li Tianfeng nodding, the test driver shouted loudly, and when he heard the order, one of the test cars pressed the test button.

The originally very quiet monitoring and control room was filled with the sound of the engine working, and the engine on the test bench quickly entered the rated power state.

Spray the sand!

Suddenly, a stream of sand and dust poured in from the air intake in front of the test bench, and the sand and dust were filled, almost filling the entire test bench.

You may have seen the helicopter landing in the Gobi Desert, the helicopter's rotors rotated rapidly and raised a cloud of sand and dust, and the current situation is similar to that situation.

The rated power of the engine on the test bench, a large amount of air is sucked into the engine, and there is sand and dust in these airs.

Time passed second by second, two minutes, 120 seconds, such a short time, everyone felt that it was a very long time, during this period, worried about the engine abnormality.

Two minutes finally passed, everyone quietly pinched a handful of sweat, and the test commander said loudly: "Stop spraying sand and dust!" ”

Soon, there was no sand and dust in the air intake of the test bench, and the sand and dust around the test bench quickly dispersed, and everyone could clearly see the engine on the test bench.

Although there is no more sand and dust sprayed, everyone's nervous mood does not dare to relax at all, either nervously looking at the engine that continues to work on the test bench, or looking at the instruments and meters on the test control platform, looking at the number of test runs.

Li Tianfeng has been listening to the sound of the engine test with his ears pricked up, and from beginning to end, the sound has been normal, Li Tianfeng was slightly relieved, and looked at the instruments and meters of the test control platform, and gave the test commander a look.

The test commander understood and immediately reported loudly.

The engine vibrates normally!

Engine fuel consumption is normal!!

The engine output is normal!!

The overall performance of the engine is normal!!

……

The sound is normal, how pleasant this is, it makes people comfortable to listen to, and in the entire test monitoring and control room, everyone's heart is gradually relieved.

Stop the test!

As the engine continued to work for a few more minutes, the engine stalled, and the deafening test grinded to a halt, then quieted down.

There was no sound of the test, the entire monitoring and control room was quiet at first, and then, everyone came back to their senses, glanced at each other, and saw the excitement and joy in each other's eyes.

"Oh yes!!"

"Success!!"

In the entire monitoring and control room, there was a cheer, especially the test drivers, the test technicians, everyone's faces were full of excitement, cheering, and jumping.

There was even a test technician who grabbed his hat and threw it into the air with force and excitement.

Li Tianfeng is also more happy, the sand swallowing test is basically successful, next, as long as the engine is sent back to the assembly workshop for decomposition inspection, if the engine parts are really not the slightest damage, it is very perfect.

Of course, if you disassemble and inspect and find that the engine has damaged parts due to inhaling sand and dust, then the matter is a big deal.

If in case of such a situation, indicating that the engine has defects in the safety of sand swallowing, then the design must be refined and improved.

Of course, this is the worst, the worst situation, according to the number of test runs, and the situation when the engine is working, the possibility of such a situation is relatively small, therefore, the test is completed, the number of each thing is normal, everyone will be so happy.

………

Today's three watches, the third watch is complete!

It's three watches again, and the brothers who have a monthly pass support it, and those who don't have a monthly pass help cast a few recommendation votes. (To be continued......)