On the surface of this flame cylinder, the color is dark in some places, and there is a slight abnormality, which is caused by poor local cooling and high local temperature.

Li Tianfeng said: "Mr. Qiu, the design of this flame cylinder must be improved to a certain extent, add a circle of cooling micropores here, and lengthen this double-layer cooling plate a little. ”

Hearing this, Qiu Wenan nodded, firmly in mind, such a design improvement Qiu Wenan knew that it was necessary to pay close attention, after the improvement, after the new design drawings came out, the parts had to be reprocessed, and the reprocessed parts were installed on the engine, and the verification test was carried out again.

Li Tianfeng thought in his heart, fortunately, the problem is not very strict, just make a small design improvement, the basic structure of the parts will not change, and it will not cause the change and redesign of the rest of the related parts, otherwise, the problem will be troublesome.

After the completion of the first verification test, the second verification test could not be delayed for too long, so Li Tianfeng said: "Mr. Qiu, hurry up and complete the design improvement and review within a week." ”

Qiu Wenan also knew that time had to be hurried, so he nodded and said, "Boss, it won't take a week, three days is enough." ”

Now, Qiu Wen'an has so many designers under him, and he is also very confident, and the design of this engine has been completed, and some of them are manually improving the design of parts such as flame cylinders.

The verification test exposed a lot of problems, but fortunately it was not a big problem, and the design improvement of related parts was not very large, which was a slight improvement, and the difficulty was not great.

In terms of the processing technology of the parts, as well as the assembly process, and the selection of materials, the verification test of Tongguò also exposed some problems, however. It's not a strict problem, just improve and perfect them one by one.

For example, the problems exposed by the flame tube just now belong to a relatively large one, and in addition, there are several problems that are basically similar to this, and they also belong to the same level. The parts need to be designed and perfected one by one.

A month later......

This machine was launched for the second assembly, and some parts were designed and improved, and replaced with parts with new designs and new processing, such as parts such as the flame cylinder of the engine.

Assembling again, Li Tianfeng still didn't dare to be careless, basically went to the assembly workshop every day to see the assembly situation, because of the experience and foundation of the first assembly, this time the assembly time was shorter, such as the final assembly took two days less than the last assembly.

The engine was assembled again. Then, the second validation test began, and the engine was transported from the final assembly hall to the test shop, where it was again loaded onto the ground test bench in preparation for the second validation test.

This test run was also very grand, Li Tianfeng, Qiu Wen'an, Sun Xiaoping and others came to the test site in person, in the monitoring and control room next to the test platform. Through the thick glass, Li Tianfeng can clearly see the engine installed on the test bench and ready to test it.

Li Tianfeng and others are ready to start the test run. In the huge test workshop, the employees were slightly excited, especially those who saw the engine being sent to the ground interview platform.

"You know what? The second validation test is about to begin. ”

"I heard that although the first verification test was relatively successful, it also exposed some minor problems, and this is the second verification test after the design and process improvement."

"The second validation test is a complete success."

"Me too. Hope for a complete success. ”

"yes, I'm looking forward to it!"

“……”

Everyone was in a heated discussion, slightly excited, full of anticipation, when everyone was hotly discussed. I heard the alarm bell ring for the first test run.

Jingle Bell !!

After the rapid bell rang, everyone's mood became even more excited, and some people even had their hearts beating faster, almost jumping to their throats, and even breathing rapidly, and the mood was really unable to calm and calm.

Jingle Bell !!

The test alarm bell rang again throughout the test workshop, even in the office is clearly audible, hearing the second bell, many people silently said in their hearts, about to start the test run.

Not long after, the third test alarm bell also rang urgently, which means that the second verification test is about to begin, the entire huge test workshop seems to be completely quiet at this moment, the office, the workshop site, all quiet, unprecedented quiet.

Test bench monitoring and control room.

At this time, it was also quiet here, and it seemed that the sound of dropping a needle on the ground could be heard, and the sound of everyone's breathing could even be faintly heard.

The test alarm bell rang three times, and the test run was about to start, the test commander looked at Li Tianfeng, Li Tianfeng nodded, and the voice full of air broke the silence of the entire monitoring and control room, "Start the test run!" ”

The test commander also said loudly and loudly: "Start the test run!" ”

"Start the test drive!"

Hearing the command of "start the test", one of the test drivers pressed the test button, and the starter on the test bench drove the engine to start idling, and the speed gradually accelerated, reaching the speed of the slow state, and continued and steady operation for two to three minutes in accordance with the test process regulations, which is the so-called fake driving.

The engine also quickly entered the state of false driving, and the speed of the slow state was maintained for two or three minutes, one qiē was normal, and the number of each was normal, and the sound of the engine, performance, and so on were all normal.

"Normal!"

"Normal !!"

"Fake driving normal !!"

Li Tianfeng nodded, pretending to drive normally means that there is no problem with the engine assembly. The test commander waved his hand, made a gesture, and shouted loudly: "

"Ignition, enter the slow train working state."

Hearing the order, the test driver pressed the button, the engine ignited successfully, and began to work, gradually emitting a sharp and steady sound, the sound gradually increased, and in the monitoring test room, everyone felt that the sound was deafening, and if they didn't speak loudly, they really couldn't hear clearly.

This is completely different from the quiet before the test just now, the sound of the engine really working is still very loud, sharp and calm sound, it sounds very comfortable, at least, Li Tianfeng thinks that this sound is very comfortable.

"The slow train is in normal condition!"

Without reporting, Li Tianfeng knew that the state of the slow train must be normal, and he could basically judge it just by listening to the sound.

Next, according to the test procedures and prescribed subjects, one by one test runs, such as cold start, hot start, oxygen start, automatic start, equivalent power start, false hot start, cold run, etc., also carried out the cruising working state, rated power state test.

Normal!

Normal!!

Normal!!!

One by one, the test run was carried out, a qiē was normal, Li Tianfeng's mood was slightly lighter, the second verification test was much smoother than the first test test, and the situation was much better, at least it showed that the design improvements and process improvements after the first verification test were effective and played a role.

Qiu Wenan and Sun Xiaoping also glanced at each other, and both saw the joy in each other's eyes.

The test commander gestured and shouted loudly: "Test run in the maximum working state!" ”

The maximum working state is also the maximum power output working state of the aero engine, which is a real test state, the last test run, it was in this state that there was a problem, although it was a test bench failure, but now at the beginning of the maximum working state test, everyone's look is positive.

Li Tianfeng is also a straight face, however, at this moment, Li Tianfeng's mood is relatively relaxed, out of full confidence in his engine, Li Tianfeng believes that he will be able to successfully complete the maximum working state test.

As the order was issued, the test driver pushed the control lever to the limit position, and on the test bench, the engine let out a roar, and the sound was obviously a little louder, at this time, the engine exerted its maximum power.

In the monitoring and control room, everyone's eyes looked at the LCD monitors, as well as those instruments, and the number of test runs was clear, and everyone saw that the output power of the engine was climbing rapidly.

Everyone's heartbeat speed seems to be accelerating rapidly with the climb of this number, and many people are slightly nervous in their hearts, such a tense atmosphere seems to be invisibly permeated in the entire monitoring and control room, Qiu Wenan and Sun Xiaoping seem to feel this atmosphere.

The two glanced at each other, inexplicably, and there was also a burst of nervousness in their hearts, Qiu Wenan's face changed slightly, and he seemed to be a little infected, his heartbeat accelerated slightly, his mood was slightly nervous, and he clenched his fists tightly, and there was a slight sweat in his fists.

Sun Xiaoping prayed in his heart that there would be no problems, God blessed, and he must successfully complete this test run of the maximum power state.

Several test drivers were also slightly nervous, and one of them even wiped the sweat on his forehead, because of nervousness, the test officer's head was slightly sweaty.

There was also a test driver, perhaps in a nervous mood, who quickly took a few deep breaths, trying to control his mood, trying to calm himself, and trying to keep his mind clear.

At this time, as a test commander, the pressure is also very high, at this time, you must be very sober, and control the time, grasp the proportion.

Li Tian glanced at the entire monitoring and control room, and then glanced at the engine on the test bench that had reached the maximum output power state through the glass.

At this time, the number of jù did not continue to climb, and the time passed second by second, and the entire test monitoring and control room only had the sound of engine work.

………

The first one is sent first, and the code words continue after the evening, and the second one is a little later. (To be continued......)