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Liang Yuan listened to the discussion between his father and uncle for a while about how to reform the overhaul plant, and felt bored, and then took out the book "Principles of Aero Engines" and read it.

Zhang Yi watched Liang Yuan hold a thick book and looked at it, and asked curiously, "What kind of book is Xiao Yuan reading, so thick?"

Liang Yuan inserted the bookmark, closed the book and handed it over, Zhang Yi took it and looked at it and asked in surprise, "Xiaoyuan, can you understand?"

Liang Yuan said with a smile: "I know all the words one by one, and it is a little difficult to line them up" Li Yuanling was amused by Liang Yuan and said to Zhang Yi: "This guy is not in shape all day long, I am going to annoy him, what about your family Panpan, why didn't you come over." ”

"I'm angry with Haiping, and I live at her grandmother's house every day. Zhang Yi pointed at Liang Yuan and said, "I didn't learn from this brother and ran away from home." ”

The two women saw Liang Yuan roll his eyes, put his head on the sofa weakly, and laughed.

After dinner and seeing off Liang Haiping and his wife, Liang Jiangping, who had solved his heart disease, was in a good mood, and rarely wanted to care about Liang Yuan's recent study, and found that Liang Yuan was looking at "Principles of Aero Engines" intently, and walked over, picked up his father's shelf and said: "Xiaoyuan, don't be too ambitious to study......

Before Liang Jiangping finished speaking, Li Yuanling interjected: "How do you know that Xiaoyuan can't understand the principle of aero engines, Lao Liang has never seen you like this, and he just relied on his son to solve the problem at work, so he came over to pick a thorn in his son." Li Yuanling smacked her lips and said, "I've never seen you so fast when crossing the river and demolishing the bridge." ”

Comrade Liang, who had been hit hard again on the issue of education, went to watch the "Evening News" in a gloomy manner, Liang Yuan poured a glass of water for Li Yuanling, and handed it over with a smile, Li Yuanling took the cup and took a sip, and asked in a low voice: "Xiaoyuan, Mom has been reading that book for many days, can you understand what is written in the book?"

Liang Yuan said: "I can't understand the mathematical formulas and equations, but I can understand the principle of the aero engine." ”

Looking at Li Yuanling's somewhat surprised gaze, Liang Yuan took the pen and letter paper and drew it, Liang Yuan pointed to a large cylinder drawn by himself on the paper with a small cylinder pattern and said: " In front of the large cylinder is the air intake, the air is compressed by the high-pressure fan driven by the compressor, so that the air flows backwards faster, part of the air enters the small cylinder, and a part of the air flows backwards through the gap between the small cylinder and the large cylinder, and the air that enters the small cylinder is ignited after mixing with fuel, and continues to flow backwards after becoming high-temperature gas. ”

"I just talked about a turbofan engine, and the turbojet engine just doesn't have a big cylinder, and all the air enters the small cylinder and ignites and then spews out backwards."

"Mom, I'm right," Liang Yuan finished speaking, looking at Li Yuanling with a look of hope.

Li Yuanling looked at her son and thought, although the principle of the aero engine is not like a brief word, but the general idea is really correct.

Li Yuanling thought for a while and said: "Xiaoyuan, what you said about the most basic principle is almost correct, but what you understand is like the status of 1+1=2 in the field of mathematics compared to the real aero engine field." ”

Liang Yuan sighed and said, "Mom, you just said that it is equivalent to the kindergarten level." ”

Li Yuanling giggled and said: "It's far inferior to the kindergarten level, using 1+1=2 as an example is that my mother really can't find an adjective that reflects such a low level." ”

Liang Yuan threw the book on the sofa in frustration, then pillowed it, and said weakly: "Mom, I read the book that when the turbofan and the turbojet are under the same conditions, the thrust of the turbofan is much greater than that of the turbojet, why is this? The turbofan is a mixture of gas, and the thrust of the turbojet should be smaller than that of the turbojet sprayed purely by gas." ”

Li Yuanling looked at Liang Yuan lying on the sofa, got up and walked over and touched Liang Yuan's hair and said: "This problem is very complicated to explain, to put it simply, the small cylinder drawn by Xiaoyuan is called the connotation road in the aero engine, and the big cylinder is called the outer duct. Li Yuanling drew a large circle on the paper, and then drew a small circle on the side and continued: "The turbojet engine is equivalent to only the connotation of the road, and the thrust generated is the small circle drawn by my mother." ”

"Take water as an example, Xiaoyuan, do you say that the thrust generated by the thick water column is large, or the thrust generated by the thin water column is large? ”

Li Yuanling saw Liang Yuan nodded and continued: "The gas driving the outer duct air can be classified as an entrainment effect in physics. To put it simply, when there is a beam of air flowing through guò at a rapid speed, due to the different speed of the air flow, this air flow will rub against the air around it, and it will envelop and drive the surrounding air to ...... forward together."

Liang Yuan waited for a long time until Li Yuanling mentioned this theory, and after listening to Li Yuanling's explanation, he thought about it and said: "Mom, if the gas injection of the inner duct is removed, will the compressed air of the outer duct be sprayed out as thick as the outer duct?"

Li Yuanling nodded and said, "Yes, but the speed of the air column will be much slower, and the thrust will be much smaller." ”

"Mom, I have an idea, you can see if it can be realized" Liang Yuan picked up the pen and drew an X on the drawing of the cylinder representing the inner road, and then connected a 90-degree elbow on the large cylinder representing the outer duct, and drew a fan under the elbow. Liang Yuan drew the basic principle of the bladeless electric fan in later generations with a few brushstrokes.

Li Yuanling has studied aero engines all her life, and she can't understand aerodynamics, looking at Liang Yuan's simple diagram, and after a little thought, she realized that this thing is simply a variant of electric fan, Li Yuanling was irrepressibly excited, hugged Liang Yuan and kissed her a few times and said: "Baby, how is this possible, how did you come up with it? This idea is too genius, this is a pioneering initiative, this is a new initiative." ”

Liang Jiangping heard Li Yuanling's excited shout and hurriedly leaned over to see what the two of them were doing, Li Yuanling let go of Liang Yuan and hugged Liang Jiangping and cried and laughed: "Old Liang, my son is a genius, you can see what Xiaoyuan has invented." ”

Liang Jiangping picked up the illustration drawn by Liang Yuan and looked at it for a long time, and said confusedly: "What is this, an elbow with a pipe, oh, there is a fan below." Is it a new type of blower?"

Li Yuanling glanced at Liang Jiangping hatefully and said, "You have been a brick mover in your life, and you can't compare to my son in your life." ”

Li Yuanling drew a diagram on the paper with a pen, and then introduced the internal and external ducts of the turbofan engine and Liang Jiangping, and finally said the physical entrainment effect, although Comrade Liang was a brick mover, but had to admit that he had moved a good brick, and after figuring out Li Yuanling's intentions little by little, the two of them discussed for several hours, and the last schematic diagram of the working principle of the bladeless electric fan that was similar to what Liang Yuan had seen in his previous life appeared in front of Liang Yuan. A cylinder equipped with an aspirating fan serves as the bottom base of the bladeless fan, and above the base is a large hollow ring, through which air is sprayed out, driving the surrounding air flow to form a flowing air column.

Liang Yuan looked at his parents adoringly, and said in his heart that these two people are really a perfect match, and the foreigner has been tinkering with things for several years, and these two people actually made a draft out of it overnight.

Li Yuanling dragged Liang Yuan into her arms, kissed her fiercely, pointed to her head and said, "No wonder the teacher said that thinking is the most important thing in the field of aero engine design, and then the materials." My mother has been working in aero engine design for half her life, and she never thought that the connotation channel would be removed, leaving only the outer duct that could be used as an electric fan. ”

Liang Yuan smiled and said: "Mom, I just have an idea, don't say that I invented this thing, now look at the sketch you and Dad made up, if you two don't explain it, I won't recognize what this thing is." ”

Li Yuanling rubbed Liang Yuan's hair and said, "This thing is still early from the finished product, I have to calculate the aerodynamics of the ring to design the best position of the jet port, and also calculate the air intake volume and the air flow rate of the jet port, etc." ”

Comrade Liang, who was also excited, continued: "You have to choose the right material to make a hollow ring, find a motor suitable for working under closed conditions, and your mother has to design an efficient air intake fan." ”

The excited family of three discussed the sketch of the bladeless electric fan until the second half of the night, and then went to sleep helplessly.

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