The ring tube-type combustion chamber is to place the flame cylinder of combustion fuel on a ring-shaped cross-section, and the structure is relatively compact. When designing the engine, you only need to study the combustion conditions of one flame cylinder and then combine it. It is less difficult for design work and processing.

However, the ring-type combustion chamber has a fatal disadvantage, that is, its flame drum is separate, so that the temperature in the place where the two flame drums at the outlet are stacked, the temperature is higher than elsewhere. In this way, it will be very harmful to the gas guide blades in front of the power turbine. The life of the blades in the high temperature is only one-small of the other places, and the ring-shaped surround combustion chamber is good to avoid this disadvantage.

The annular combustion chamber is not composed of multiple flame cylinders. The entire combustion chamber is a whole. The fuel is evenly combusted within the entire ring. The temperature of the outlet gas field of the combustion chamber is uniform than that of the annular tube combustion chamber. Moreover, the fuel nozzles required for the annular combustion chamber are also less than those of the annular tube combustion chamber. A uniform temperature field is of great benefit to the overall life of the gas guide blades that directly bear high temperature gas. It can also improve combustion efficiency, inlet temperature of the power turbine, reduce emissions and increase engine power.

However, the difficulty in design is much greater than that of the ring tube-type combustion chamber. The combustion of fuel in the entire ring is very complicated. The conditions that need to be considered during design are dozens of times that of the ring tube-type combustion chamber, and the difficulty in processing is also much greater than that of the ring tube-type.

"The teacher is too difficult. It's only been seven or eight years since foreign countries broke through here," Li Yuanling asked curiously.

Wu Zhonghua nodded and said, "In the 1980s, the new generation of foreign engines began to use this kind of combustion chamber. As for SB, if the combustion chamber could be replaced with an annular shape, the engine's volume and weight would be much lower."

"The teacher changed the combustion chamber, which is equivalent to redesigning the Spey engine once." Li Yuanling sighed and said Wu Zhonghua laughed and said, "When we can change the Spey engine as much as we want, we can say that we have fully understood Spey's technology."

"Xiaoling, you should focus on family-leaving of the turbofan blades and engines in the near future. I'll talk about this with Lao Tao now."

When Liang Yuan stepped into the classroom of the junior class, the class suddenly became quiet. These days when Liang Yuan was away, the two rolls of paper for the entrance examination were already known to the whole class, and Liang Yuan disappeared without a trace after he appeared. Therefore, the classmates in the class were curious about this unique guy. They had seen people skipping classes in college, and had never seen people skipping classes in the junior class.

Ignoring the curiosity, surprise, and disdainful eyes in the class. Liang Yuanshi came to his seat and sat down, put his schoolbag into the desk, and slowly turned out the books and articles.

Two figures came over.

"Boss, you are so admirable. You are simply naked and despising the school," Song Fei said with admiration.

"Although I know that cheating in the entrance exam is impossible, I still can't help but suspect that you didn't copy it, brother, you are not copied. I feel that the worst students in the class in the past are much more diligent than you." Yu Wenjie asked in a slight manner, "You are a big-headed ghost, Xiaoyuan is much better than your head who is all numbers." Wang Mengmeng knocked the fat man's head.

"Uh, I'm sick recently. I haven't come to class." Liang Yuan said with a smile. "The teacher and I have asked for leave."

"Take it down." Wang Mengmeng said with a smile, "Just talk nonsense. Teacher Fang has asked us several times in our dormitory, asked if we have seen you recently, and asked if we know your contact information."

When Liang Yuan was entering the school, he cunningly left the phone number of Benxi's home to the school.

Throughout September, Li Yuanling was either in Shengjing or at the Benxi Locomotive Factory Guesthouse. Liang Jiangping didn't go home at all. When Liang Yuan returned to Benxi, he must have stayed at the Car Factory Guesthouse. Liang Jiangping occasionally visited Liang Yuan and stayed at the Car Factory Guesthouse. It would be strange if Master Fang called the home phone number.

"I have left a home phone number to Master Fang," Liang Yuan said in a silence.

"Master Fang? Why does Xiaoyuan call Teacher Fang a Master Fang?" Song Fei discovered Liang Yuan's unintentional words.

Liang Yuan patted his forehead and looked at the eager and curious eyes of the three of them, Liang Yuan could only explain the origin of Master Fang.

Yu Wenjie is an idiot in other aspects except mathematics, physics and chemistry. So Song Fei and Wang Mengmeng had seen the Tianlong Ba Folk, and the two of them laughed so hard that they said: "Xiaoyuan, I won't take you to bury people like this, Teacher Fang is very good."

"What do you two know? I'm a prophecy." Liang Yuan said as a charlatan, and Yu Wenjie was confused and muttered: "There is insufficient data and the probability cannot be calculated." The three of them looked at the fat man with a confused expression and laughed into a ball.

The classrooms were pushed away by a slut, and Fang Hongping appeared at the door of the classroom. The somewhat chaotic teacher suddenly calmed down.

Yu Wenjie and Song Fei heard the classroom quiet, and turned around and saw that they were facing Fang Hongping's eyes. The two of them shrank their necks and slipped back to their seats in shame.

Fang Hongping looked at the classroom with satisfaction and instantly returned to calm. Suddenly, she felt something was wrong. She glanced at the classroom again and realized that the seat that had been empty for a month finally had a master.

Fang Hongping's heart suddenly surged. This guy was missing a month's course just after school started. He actually got menopausal syndrome after taking a leave. It was simply... Fang Hongping thought for a long time but couldn't find an adjective to describe Liang Yuan's degree of obscenity.

What's even more annoying is that he reported this situation to the school. Ma Tianyuan, who was in charge of the teenage class, after Ma Tianyuan had a few sloppy attacks, he simply and neatly sent himself to the dean. How could a student tell the dean about such a small matter as absent from class? Fang Hongping gritted his teeth in anger.

Dongda University is not unrelated households and bargaining students, but they are admitted or recruited after taking the college entrance examination at the right age of our college. They are all for diplomas. What is the guy in front of me for? I don’t take him so long before he goes to the back door?

Ma Tianyuan was also suffering. When Fang Hongping came to find her, she called the teacher and asked about the student's situation. After all, she was not at ease to not come to school for a long time. She was obliged to understand the student's situation. Liao Min knew that the equipment of the Northeast Locomotive Factory was replaced by Liang Yuan's one-hand operation. After asking Li Yuanling, she learned that Liang Yuan had been busy with the motorcycle factory in Benxi, she told Ma Tianyuan directly that Liang Yuan was fine and was just missing a few days of classes for the time being.

When Ma Tianyuan heard his teacher say this, he remembered that when Zhu Liguo, the head of the Metallurgy Department, went to Benxi, he specifically asked him to take care of the student. Realizing that this student was not a small person and was not what he should have to worry about, he directly sent Fang Hongping to the dean's side.

Fang Hongping took a deep breath. Then he stared at Liang Yuan with his eyes, trying to overwhelm Liang Yuan with momentum so that he could manage the future.

Liang Yuan looked at Fang Hongping staring at him with eyes fixed on him. His snow-white cheeks were covered with abnormal rosy, his towering chest was undulating rapidly, and the buttons of the shirt on his chest were tightly stretched.

Will the two buttons fall off when exerting force? Liang Yuan thought in a lewd manner, his eyes were circling around Fang Hongping's chest and butt. What would be the effect of Fang Hongping's appearance in front of him be seen by Cai Xiaobing's scum?

The guy in his previous life was not married like himself, and he was flirting with the school in various nightclubs. He suspected that this guy failed to confess his love to Master Fang. He was hit hard and was free to flowers. He must figure out this problem in this life. 34 days is different. It turns out that the peaks are like gatherings, the waves are like anger, and the big-breasted charm cannot be stopped...

Fang Hongping looked at Liang Yuan without caring about her gaze at all. Instead, she squinted her eyes and looked at her constantly. The smile on the corner of her mouth was so awkward. Fang Hongping opened her mouth and did not call Liang Yuan out for a conversation. Judging from this guy's virtue, she knew that the conversation would not play any role, and she would just make her angry.

Fang Hongping took a deep breath, suppressed the anger in her heart, and decided to give up Liang Yuan completely.

"Wang Mengmeng, you bring three classmates to my office and bring all the test questions for this month." Fang Hongping said, Wang Mengmeng responded, shouted Song Fei and Yu Wenjie to pull Liang Yuan up again and said, "Go, go and work."

Several people left the corridor, and Song Fei said with a smile: "Xiaoyuan, Bai admires you. It turns out that you have asked Teacher Fang for leave. Then Teacher Fang asked us what your phone is doing?"

Liang Yuan just smiled and did not answer Song Fei's question. He was also puzzled why he could get away with it so easily. After thinking for a long time, he could only attribute it to Master Fang's temporary lack of skills and had not yet achieved great success in his magical skills.

Liang Yuan took a class leisurely all morning, and the two lolitas were excited at noon waiting downstairs of the junior class early. The teenager class of Dongda University recruited more than 100 people in three classes this year, all of which were taught in the same building. As early as the start of school, the two lolitas had waited for Liang Yuan downstairs of the junior class. Everyone who had seen them was surprised, but unfortunately, they were astonished as a surprise, and then they never saw anyone again.

Those who have seen two lolitas during their chats said that they only saw such similar twins in their lives, but naturally they did not believe that those who had never seen each other before. The topic of the two lolitas lasted for more than ten days before slowly disappearing. This time, the two little girls suddenly appeared again, and when Liang Yuan went downstairs, there were more than 20 people around the two lolitas, pointing fingers and trying hard to distinguish the similarities and differences between the two little girls.

The onlookers of this scale are completely neglectable for the two lolitas. When Liang Yuan came down, the two little girls threw them over and said, "Xiao Yuan, you are always not active in eating, you are late today." Song Fei shouted and said, "Liu Chuang of 311 doesn't believe it yet, I'll go and ask him to come and have a look." Then he frowned and said, "Boss, you tell me whether you can wait for a while, Liu Chuang won't go to the cafeteria at noon."

Liang Yuan looked at Song Fei with a wry smile and shook his head and said, "Don't call me the boss anymore. Now they are the bosses. I was just beaten up by them a few days ago. If you are not afraid of death, just tell me."

"It's true or false" Song Fei and Yu Wenjie asked suspiciously.

"Ning Wanfei practices karate, it's useless to multiply two of you like this." Wang Mengmeng knew the old background of the two loli, and said to them disdainfully.

The two of them looked at Liang Yuan taking the lunch boxes of two loli, looked at each other and shrank their necks, followed honestly behind them.

Ning Wanjia gently pinched Liang Yuan and said coquettishly: "Where did he hit you?" Then she remembered something and her little face turned slightly red.

Ning Wanfei wrinkled her pink and white nose and said, "I thought the junior class could be more mature, but it was no different from the affiliated primary school. What's so strange about twins?"

Wang Mengmeng smiled and said, "The first time I saw you two in the Children's Palace, I was also surprised. If Xiaoyuan could come to class all the time in the near future, I would probably be fine after a while."

Song Fei and Yu Wenjie also came over and asked Liang Yuan with a smile how to distinguish the two loli. The group walked towards the cafeteria with a laugh.

After lunch, Liang Yuan ignored Fang Hongping's gaze and slept for a class as usual. He listened to a class, and when the school bell rang, he packed his schoolbag and went to the affiliation elementary school to pick up the two little girls home. He left all the duty and other things behind him.

He returned to the 909 community with two loli and chatted with each other. Liang Yuan unexpectedly found that Li Yuanling was actually cooking in the kitchen and threw down her schoolbag. Liang Yuan ran to the kitchen and asked curiously: "Mom, why did you come back so early? It's a wonder of eternity."

Li Yuanling patted Liang Yuan's head and smiled and said, "What a wonder? My mother was unemployed today. She has to rely on Xiaoyuan to pay for her salary in the future. Why don't you buy food and bribe my son quickly?"

"Mom, you'll get the project team out so soon?" Liang Yuan asked excitedly.

After Wu Zhonghua found Tao Yonghe, he handed over the plan that Li Yuanling sorted out, and then said directly: "Old Tao, although Xiaoling spoke a little, she was not right to the people."

"Since I heard that the Navy has unknown attitude towards the gas turbine unit, Xiaoling ran outside for a long time and found an investment. However, the other party proposed that the unit should go to land and be used as the main engine of industrial power generation. Considering that we are old relationship, Xiaoling made this plan, Lao Tao, how about you?"

After hearing that Li Yuanling found the investor again, Tao Yonghe felt nervous. Although the project was led by Wu Zhonghua, the person in charge of Factory 423 was himself. If both parties broke up, even if the reason for the failure of the unit development could be pushed to Wu Zhonghua, he would have wasted his past few years. Moreover, the factory's investment of nearly 10 million yuan was invested, and it was basically no different from being used. It would be much more difficult to think about what project he led in the future.

Tao Yonghe took the document with some anxiety, and couldn't help but think about what unit is so big that he dared to invest here. Could it be that he had too much money to spend it? If he had known it, he wouldn't have had any trouble with Li Yuanling.

Open the file, Tao Yonghe looked at it intently. Twenty minutes later, Tao Yonghe breathed a sigh of relief and felt relieved.

After closing the document, Tao Yonghe pondered for a moment and said, "Old Wu, you have a successor. Xiaoling not only has a high scientific research level, but also has a very outstanding overall view."

"I have nothing to say about this document, but we are familiar with the Navy. In the past few days, I have tried to ask them to come up with strict gas turbine acceptance standards, so that Xiaoling can change the scientific research direction.

"Although 423 has some small conflicts with Xiaoling's scientific research ideas, some people have good skills. It's a pity to go back to 423 with me. I hope Xiaoling can keep these people and continue to shine for the scientific research of gas turbines."

After Tao Yonghe added a few more points, he reached a consensus with Wu Zhonghua. The two sides decided to split the project team after the Navy's acceptance standards came out.

Liang Yuan listened to Li Yuanling's words and admired the cunning Tao Yonghe. This old guy was well-rounded and basically blocked all loopholes. As long as the data of the generator set developed by Li Yuanling for Lanhua next year is not too miserable, the matter will be perfect and everyone will be happy.

"Where is Grandpa Wu and Grandma Liao?" Liang Yuan asked curiously.

"They will come back tonight and will split the project team in a few days. Now they are preparing for the 909th Institute."

Five days later, the Navy Equipment Department proposed a relatively strict gas turbine unit acceptance standard, which stipulates that the unit's power must reach more than 12,500 kilowatts, the first overhaul time must reach at least 360 hours, and the fuel consumption rate must be less than 300 grams/kilowatt-hour.

In Liang Yuan's opinion, the Navy's acceptance standards are not strict at all, and it is already enough. The 360-hour overhaul means that the ships can't go to sea to fight for more than 10 days. Take the dual-ship patrol of Huangyan Island as an example: it takes one day to travel, 8 days for regular patrols, and then it takes one week to return to the port to overhaul the engine, and 6 ships a month to ensure all-weather cruise. At this time, there are only 9 "large ships" of more than 1,000 tons of the South China Sea Fleet.

Looking at the Navy's acceptance standards in his hand, Liang Yuan felt a little sad, and understood the Navy's urgent need to introduce the US LM2500 gas turbine. The overhaul time of the LM2500 series was 8,000 hours, and it increased to more than 10,000 hours after the new century.

Compared with the Navy's acceptance form, the unit 909 was qualified in terms of fuel consumption rate, and its power was only slightly worse, and there was still 100 hours away from the first-turnover requirement of 360 hours. Only this requirement was far behind. This result was explained in all aspects.

After the Navy's acceptance, Li Yuanling announced the acquisition of the scientific research results of the entire project team instead of the Northeast Locomotive Factory to continue to develop civilian power generation gas turbine units. He paid 8.2 million yuan and 2 million yuan to Factory 423 and the Chinese Academy of Sciences respectively to purchase project team prototypes and all data and experimental data.

At this point, after more than half a year of operation, the country spent billions of yuan, and most of the technology and half of the equipment of the SBE aircraft engine introduced were completely under Liang Yuan's control.

Liang Yuan threw down the Navy's acceptance report and asked, "Mom, there are all high-temperature resistant metal formulas in the project team?"

Li Yuanling nodded and said, "Most of them are not much different from aircraft engines. There is only information about receivers, tail nozzles, afterburners, etc.."

Those things are not important, and Liang Yuan, who has not had to consider the issue of heaven for three or five years.

"Mom, I want to merge the project team's metal research part with the metallurgy laboratory, and the relevant process manufacturing part, and re-establish a laboratory, and serve gas turbine and locomotive manufacturing at the same time."

Liang Yuan did this and planned to use precision manufacturing of fuel turbines to forcibly improve the process manufacturing level of railway locomotives and produce railway locomotives based on the standards for producing gas turbines. Even in the future high-speed rail era, it would be more than rich. In Liang Yuan's view, if a strict production standard can be successfully established, it would be extremely cost-effective to pay some additional costs for this.

Well, the debt is probably made up ^_^, and I will try to make up the two updates I agreed to earlier tomorrow.!~!
Chapter completed!