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Chapter 204 Verification test drive
"Wow, there are so many people, look over there at the assembly table."

"Really, even President Lin came in person."

"Not only Mr. Lin, but Mr. He, Mr. Wang, and Director Fang Anping are all there, and there are quite a few leaders in our workshop. Quanwei is there."

"."

It is now the afternoon work time, and some workers in the assembly workshop saw such a scene as soon as they entered the aircraft assembly site.

Some didn't understand what was going on, but one seemed to guess why.

"It should be that our verification machine is almost finished."

"It should be, otherwise Mr. Lin and the others wouldn't come here in person."

The final assembly of the verification machine is a major event for Leihuo Technology Industrial Group. After more than half a month, the final assembly of this turboshaft engine is finally about to be completed.

The workers in the final assembly class did not take a break at noon, they ate boxed lunches in the workshop lounge, and then continued with the final assembly.

Now it's the final assembly of the parts, the workers put the parts into the engine and start tightening the screws.

A total of six stainless steel screws were tightened one by one by the monitor of the final assembly team with a torque wrench.

Suddenly, Qin Jianguo, the director of the assembly workshop, suggested, "Boss Lin, how about you to tighten the last screw?"

Hearing this, the monitor of the assembly team stopped and left the last screw to Lin Feng.

Lin Feng smiled happily, "Then let me tighten the last screw."

Holding a torque wrench, check the torque first, and then start to tighten the screw until the torque requirement is reached, and the torque wrench makes a clicking sound before stopping.

Many people were slightly stunned, but Boss Lin's screw-tightening action was very standard and seemed relatively skilled.

Seeing everyone's surprise, Lin Feng smiled and said, "I have worked in Fenghuang Factory for three years. When I first started working, I had an on-site internship in the assembly workshop of Fenghuang Factory for three months. Tightening screws is a common thing."

It turned out to be the case.

After Lin Feng tightened the last screw, he passed the thin steel wire rope through the hexagonal nut of the screw. There was a small hole designed on it, just enough for the steel wire to pass through.

After threading the steel wire, Lin Feng picked up the special locking tool, pulled it lightly, and the screw was locked, and then cut off the excess steel wire with wire cutters.

I don't know who was the first to applaud, and there was a burst of warm applause at the scene.

The final assembly of the first verification machine is completed!

This will be milestone.

It is destined to leave a heavy stroke in the development history of Leihuo Technology Industrial Group.

Lin Feng looked at the time, and after the applause subsided, he said loudly: "Everyone remember this time, it is 1992:3 on March 16, 42!"

Qin Jianguo said loudly, "Write the time into the resume of this engine and record it permanently."

The final assembly of the engine is completed, and the next step is to carry out the final inspection of the engine, check the appearance, check whether all the parts are installed and in place, and check whether all the records are complete.

Another important task is weighing.

The design weight of the LH1500 turboshaft engine is 272.5 kg, and the difference between the actual weight of the engine and the design weight cannot be greater than plus or minus 2 kg.

"Report to the leaders that the engine assembly is correct!"

Several inspectors made a comprehensive visual inspection of the engine, and even one inspector was wearing white gloves, turned the compressor rotor of the engine, and found that it was very smooth, without the slightest sticking phenomenon.

After checking, start weighing.

Everything has been prepared long ago, the desktop electronic scale has been calibrated and zeroed.

Under everyone's eager eyes, the workers hoisted the engine with a special spreader and gently placed it on the electronic scale.

Including this special spreader, all tooling, special measuring tools, etc. used in the assembly process of this turboshaft engine are all designed systematically. Lin Feng just guides everyone to draw their design drawings.

The engine is placed on the electronic scale.

The weight is quickly revealed.

The actual weight of the engine is 272.15 kg.

Fully meet the design requirements, even perfect!

Originally, some people were more worried, thinking in their hearts, if the engine is overweight or not heavy enough, it will be more troublesome.

The engine had to be disassembled to find out the reason, and even some main parts had to be weighed individually to find out who was lighter and who was heavier.

This job is a lot of work and very time consuming.

Fortunately, it's so perfect!

The actual weight of the engine is 272.15 kg.

There was another burst of applause.

Lin Feng waved his hand and said loudly, "The engine is qualified, it can be transported to the test stand, ready for verification and test run!"

As soon as the voice fell, many young technical employees even cheered.

In the festive atmosphere, the truck that had been on standby for a long time drove in through the logistics gate. The engine was hoisted onto the truck and covered with a thick tarpaulin in front of everyone's eyes.

The gate of the factory area.

Several security guards from the security department were placing fireworks one after another, in a long row, tens of meters long, very spectacular.

After getting ready, several security guards started to light the fire, and then the sky-shaking fireworks sounded, attracting a lot of attention.

Outside the gate of the factory is the main road of this national industrial park. There are many people and vehicles, some walking, some riding bicycles, and some cars or trucks pass by here.

"What's the matter, there are so many fireworks in broad daylight."

"That's Leihuo Technology Industrial Group!"

"Probably some great event!"

"."

People who pass by here, when they see such a scene, will basically stop and take a look, and then guess curiously, what is going on here, it should be a big happy event.

Today is the weekend.

The first test run of the verification machine is scheduled for tomorrow morning, which is Monday morning.

In the big villa.

Lin Feng was reading a book in the study room, an aero-engine design manual, in English, and entrusted Wu Tianhua to buy a lot of professional books from the United States, this is one of them.

While reading a book seriously, there was a sound of footsteps outside the study, and Hu Xiaoxiao came in with a plate of cut fruits, and gently placed it on the desk.

There is also a glass of finished milk next to it, which she soaked and brought over.

Lin Feng said, "The fruit you sliced ​​is not bad, and you put it in a shape, it looks like you want to eat it."

"Well, it's very sweet. Would you like to try a piece now?"

Lin Feng nodded, and was about to poke a piece with a toothpick. Hu Xiaoxiao had already poked a piece, "Brother Feng, open your mouth."

Lin Feng opened his mouth.

Hu Xiaoxiao put this piece of fruit into Lin Feng's mouth, "Is it sweet, is it delicious?"

"Well, it tastes good, very sweet."

"Then eat another piece."

Hu Xiaoxiao fed Lin Feng another piece, then quickly kissed Lin Feng on the face, and then ran away quickly.

Two red clouds crept up her cheeks quietly, and ran down the hall on the first floor in one breath, her face was still red.

A heart was pounding with tension.

This is the first time she has been so proactive.

Test workshop.

Although today is the weekend, there are still many people here. Xia Yang, the technical director of the workshop, stays in the control room of the test bench and personally directs everyone to do debugging and testing.

When he first joined Leihuo Technology Industrial Group, he was a design supervisor. He participated in the drawing of many design drawings of the LH1500 turboshaft engine and performed well. Now he has been promoted to the deputy technical director of the test workshop.

This is also a professional counterpart.

The test technology and aero-engine design are compatible, and even the test process is determined by the designers, and the test indicators of the aero-engine are drawn up by the design.

In the test control room, there are seven or eight test workers and four or five technicians, and everyone is busy for a while.

The test bench can be seen through the huge vacuum glass, where several workers are doing final inspection and preparation work.

On the tooling table next to it is the verification machine, and the first verification test will be carried out here tomorrow.

"Everyone, be careful and don't make any mistakes. Tomorrow is our first official test drive."

Xia Yang reminded everyone loudly.

The aero-engine test bench is divided into a benchmark bench, a flight bench, and a high-altitude bench, etc. This is a benchmark bench.

Simulate the operation and working conditions of aero-engines in standard environments and conditions.The aero-engine test bench is also an important equipment needed in the development of the engine.

Whether we want to develop and finalize the engine, or measure important data, we cannot do without it in the simulation test. It can comprehensively analyze the performance of the aero-engine and whether it meets its standards.

Since the aero-engine has high requirements on its own stability and precision, it also requires extremely high complexity and precision of the test bench system.The entire system of the aero-engine test bench can be divided into many sub-parts such as: power generation system, fuel supply system, lubricating oil cooling system, data acquisition system, hydraulic control system, etc.

The technical team led by Fang Anping designed and supervised the construction of this test bench, which was just completed half a month ago and reached the standard for delivery.

The test workshop is divided into two parts.

The test workshop, also known as the test bench, is mainly composed of a force-measuring bench installed with an engine and an intake and exhaust system.The dynamometer of the turboshaft engine can accurately measure the torque, so as to determine the output power of the engine.

The control room is also called the control room.During the engine test, there is a strong noise of more than 100 decibels, which is also dangerous. Therefore, a separate control room with sound insulation and certain protective measures is required for the test personnel to control and monitor the work of the engine.

Throughout the weekend, Xia Yang and the others had almost no rest, and it was a busy day.

The effect is also there. All the preparations before the test run are ready, and the entire test run system is also checked correctly, and it has completely reached the test run state.

The next day, Monday.

Early on, the test workshop became lively. The workers in the test workshop hoisted the verification machine onto the test bench, installed the engine, and then connected various pipelines and lines, etc.

In the control room, the test workers and technicians are in their positions, ready to go.Xia Yang read the test run manual again, keeping the whole test run process in mind.

At around 08:30 in the morning, Lin Feng and a group of people entered the factory area of ​​the test workshop with several cars, and the cars were parked in the open space of the factory area.

Like the stars paying for the moon, everyone gathered around Lin Feng and walked into the test car control room.

"Mr. Lin, hello!"

"Hi boss."

Everyone greeted Lin Feng proactively, and the test drive room became lively. There were no.

Through the huge vacuum soundproof glass in front of you, you can have a clear and clear view of the test workshop.

This verification machine has been hoisted to the test bench, and the workers are connecting various pipelines and lines, including fuel pipes, sensor control lines, starting power lines and so on.

The starting method of this turboshaft engine is motor starting, which is no different from other aero engine starting methods.

The time passed by 1 minute and 1 minute.

After about one or two 10 minutes, the workers in the test workshop could be seen through the huge vacuum glass and began to evacuate.

In just one or two minutes, there was no worker in the test workshop, only the verification machine was on the test bench.

Xia Yang reported loudly, "Boss, everything is ready before the test run, and you can start the test run!"

Normally, he could call Lin Feng "Brother Lin" or "Brother Feng", but in formal occasions, he would call Lin Feng "Boss" with a straight face.

Lin Feng looked at the test run operation room, and saw that the test run workers and test run technicians were all in place. Through the huge vacuum glass, he saw that the test run room was empty, and everyone had already evacuated.

Raising his hand to check the time, Lin Feng's voice was very loud, "Begin the first verification test run of the LH1500 turboshaft engine!"

At this moment, many people will inevitably be excited!
After working so hard for so long, starting from the design and development of the engine, to the production and manufacture of various parts, and then to the final assembly of the engine, it is now ready to start the verification test.

Everything seems to be floating in front of my eyes.

It's time to test the fruits of your labor!

At nine o'clock in the morning, the first test run alarm bell rang throughout the factory area of ​​the test drive workshop.

Hearing the deafening alarm bell, many people were slightly excited. The test run was about to officially start, and some workers even looked far away in the direction of the test drive.

Outside the test workshop, tens of meters ahead, there are two workers with red armbands on the left and right sides guarding, and no one is allowed to approach this area.

After the test run starts, it will be a dangerous area.

At [-]:[-], the second test run alarm bell rang again throughout the factory area.

The huge air intake grille in the test workshop began to slowly open. Each air intake grille was ten meters high and about one meter wide. There were a total of twenty huge air intake grilles in total.Open together, very spectacular.

At the same time, the exhaust grilles are also slowly opened, and the entire test workshop is transparent in front and back, becoming an open type, which can facilitate the entry of airflow and the discharge of exhaust gas.

At [-]:[-], the third test run alarm bell rang throughout the factory area again, and this time the alarm bell sounded for the longest time.

Experienced people know that after the alarm bell has sounded three times, the test drive will officially begin.

In the test drive control room, when the alarm bell stopped, Xia Yang first looked at the turboshaft engine through the huge vacuum glass, and then at Lin Feng.

Feeling Xia Yang's gaze, Lin Feng nodded slightly.

Xia Yang finally said loudly, "The test run starts, start the engine, and enter the slow state!"

Hearing the order, one of the test workers pressed the start button, and the starter motor started to work, driving the engine to rotate.

Driven by the starter motor, the engine enters the idle state.

Xia Yang looked at the speed of the engine in the slow car state, and then said loudly, "Start the engine!"

Another test worker opened the accelerator, the engine fuel nozzle began to inject fuel into the combustion chamber, ignited, and the engine started to work by itself.

Other workers, technicians, carefully recorded various test data, including engine noise, vibration, fuel consumption, output power and so on.

After running for 5 minutes in the idle state, Xia Yang said loudly, "Increase the accelerator and enter the state of [-] rated power!"

The workers in the control room stepped up the accelerator, and the fuel regulator of the engine increased the delivery of fuel accordingly, and the power of the engine began to climb until it reached the rated power of 0.5.

Various data are displayed.

Loud reports resounded through the test drive room.

"The engine is working fine!"

"Torque is OK!"

"Noise is normal, vibration is normal!"

"."

Hearing the sound of "normal" one after another, many people were slightly excited and looked forward to it.

The 0.5 rated power state ran stably for 5 minutes, and under the command of Xia Yang, the chief commander of the test run, the engine reached the 0.8 rated power state again.

On the test bench, the engine made a characteristic sharp running sound. A large amount of air was sucked in, compressed by the compressor, and mixed with fuel in the combustion chamber for combustion. The high-temperature, high-speed, and high-pressure gas drove the turbine to rotate, and the speed reached tens of thousands of revolutions.

Even with vacuum sound insulation glass, the sound of the engine working can still be clearly heard in the test control room.

Experienced people will know when they hear this sound that the engine is running very stably and working very normally.

The sound of reports sounded again in the test drive control room.

"The engine is working fine!"

"Torque is OK!"

"Noise is normal, vibration is normal!"

"Fuel consumption is normal, oil consumption is normal!
"."

The running time of the 0.8 rated power state is longer, reaching 10 minutes.The engine is installed on the helicopter, and the normal working state is basically 0.8 rated power state.

Ten minutes later, the engine stepped up the accelerator and entered the full rated power state. Many people looked at the data on the instruments and meters in the control room, and looked at the working engine on the test bench through the huge glass.

There are only 30 to [-] people who can see this engine test run with their own eyes, that is, these people in the test run control room.

There are nearly a hundred people in the test workshop, and most of them cannot see the test run of this engine, but they can listen to the sound of the test run.

"Listen, the sound of the engine is getting louder, and it is estimated to be at the 0.8 rated power state."

"The sound has increased again. The sound is really nice. Now it should be a test run at full rated power."

"."

After 10 minutes of stable operation at full rated power, the real test of this engine began, and many people's hearts were finally suspended, and they felt a little nervous.

Xia Yang said loudly, "The engine has entered the maximum power state!!!"

(End of this chapter)