Liang Yuan listened to the overhaul factory discussed by his father and uncle for a while, and then he found out the book "Principles of Aero Engines" and started reading it.

Zhang Yi looked at Liang Yuan holding a thick book and was fascinated by reading it, and asked curiously: "What book is Xiao Yuan reading? It's so thick?"

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

Liang Yuan smiled and said, "It's difficult to get the words out and line them up in a row." Li Yuanling was amused by Liang Yuan and said to Zhang Yi, "This guy is not a positive person all day long. I'm going to annoy him so much. What about your Panpan? Why didn't you come here?"

"I'm so angry with Haiping and I. I live in her grandma's house every day." Zhang Yi pointed to Liang Yuan and said, "I haven't learned from this brother yet, and I've run away from home."

When the two women saw Liang Yuan rolling their eyes, they put their heads 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. He wanted to care about Liang Yuan’s recent learning situation. He found that Liang Yuan was watching the Principles of Aero Engines and walked over, picked up his father’s airs and said, “Xiaoyuan, don’t be too ambitious when studying…”

Before Liang Jiangping finished speaking, Li Yuanling interrupted: "How do you know that Xiaoyuan can't understand the principle of the aircraft engine? Lao Liang has never seen you like this. He just relied on his son to solve the work problems, so he came to pick the tricks for his son." Li Yuanling smacked her lips and said: "I have never seen you so quickly when I cross the river and burned the bridge."

Comrade Lao Liang, who was once again hit on the issue of education, went to read "Evening News" in shame. Liang Yuan's tyrannical role in pouring 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, you have been reading that book for many days. Can you understand the things written in the book?"

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

Looking at Li Yuanling's somewhat surprised gaze, Liang Yuan took the pen and the letter paper and drew it. Liang Yuan pointed to a large cylinder he drew on the paper and put a small cylinder pattern in it and said: "The air inlet is in front of the large cylinder. The air is compressed by the high-pressure fan driven by the compressor, which accelerates the flow of air backwards. Part of the air enters the small cylinder, and part of the air continues to flow backwards through the gap between the small cylinder and the large cylinder. The air entering the small cylinder mixes fuel and then ignites, and becomes high-temperature gas and continues to flow backwards. At the front end of the tail nozzle, the high-temperature gas and the compressed air flowing backwards through the gap between the two cylinders merge, and the tail nozzle together to produce thrust."

"What I just mentioned is a turbofan engine. The turbojet engine does not have large cylinders. All air enters the small cylinder and ignites it and sprays it backwards."

"Mom, I'm right?" Liang Yuan looked at Li Yuanling with a look of hope.

Li Yuanling looked at her son and thought, although the principle of the aircraft engine was simply inconsistent, her general idea was really right.

Li Yuanling thought for a while and said, "Xiaoyuan, what you said is almost correct in the most basic principle, 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, just say 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 means that my mother really can't find an adjective that reflects such a low level."

Liang Yuan threw the book on the sofa dejectedly, then pillowed on it, and said weakly: "Mom, I read the book and said that when the turbofan and turbojet are under the same conditions, the thrust of the turbofan is much greater than the turbojet. Why is this? The turbofan is mixed with gas and many uncombustible air, which should be less than the thrust of the turbojet emitted by purely gas."

Li Yuanling looked at Liang Yuan lying on the sofa, got up and walked over to touch Liang Yuan's hair and said, "This question is very complicated to explain. Simply put, the small cylinder drawn by Xiaoyuan is called the connotation channel in the aircraft engine, and the large cylinder is called the outer duct. When the gas of the connotation channel is sprayed out quickly, it can drive the compressed air of the outer duct to accelerate together, and then rush out of the tail nozzle to generate thrust." 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 channel, and the thrust generated is the small circle drawn by his mother."

"Take water as an example, Xiaoyuan, do you think it is the thrust produced by a thick water column or the thrust produced by a thin water column? The thicker the water column in a certain speed section, the greater the thrust. Do you understand?"

Li Yuanling saw Liang Yuan nodding and continued, "The internal gas drives the external duct air in physics as an entrainment effect. Simply put, the principle is that when a beam of air flow passes rapidly, due to the different air flow velocities, the beam of air flow will rub against the air around it, which will wrap and drive the surrounding air and move forward together..."

Liang Yuan talked for a long time and waited for Li Yuanling to mention this theory. He resisted the entrainment effect and thought about it and said, "Mom, if the gas injection of the inner connotation channel is removed, will the compressed air from the outer duct alone be emitted 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. Can you see if it can be realized?" Liang Yuan picked up a pen and drew an x ​​on the drawing. Then he connected a 90-degree elbow to the large cylinder representing the outer duct and drew a fan under the elbow. Liang Yuan drew out the basic principles of the leafless electric fan in later generations with just a few strokes.

Li Yuanling has been studying aviation engines for a lifetime and has no idea about aerodynamics. Looking at Liang Yuan's simple illustration, after thinking for a while, he realized that this thing was simply a variant electric fan. Li Yuanling was uncontrollably excited, and suddenly hugged Liang Yuan and kissed him hard and said, "Baby, how is this possible? How did you think of it? This idea is so genius. This is an innovation, this is a brand new innovation."

Liang Jiangping heard Li Yuanling's excited shout and hurriedly leaned over and saw what the mother and mother were doing. Li Yuanling let go of Liang Yuan and hugged Liang Jiangping and said crying and laughing: "Old Liang, my son is a genius. Look at what Xiaoyuan invented again."

Liang Jiangping picked up the illustration drawn by Liang Yuan for a long time and said in confusion: "What is this? An elbow has a pipe, oh, there is a fan below. Is it a new blower?"

Li Yuanling looked at Liang Jiangping hatefully and said, "You are a brick mover in your life, and you will never be as good as my son in your life."

Li Yuanling picked up the pen and drew a picture on the paper, and then introduced the internal and external ducts of the turbofan engine to Liang Jiangping. Finally, he talked about the physical entrainment effect. Although Comrade Lao Liang was a brick-moving person, he had to admit that it was true that he had moved a good brick. After he figured out Li Yuanling's intention bit by bit, the two discussed for a few hours. The last diagram of the working principle of the leafless electric fan, which was similar to what Liang Yuan saw in his previous life, appeared in front of Liang Yuan. A cylinder equipped with an inhalation fan was the bottom base of the leafless fan. On the base was a large hollow ring. Air ejected from the gaps in the ring, driving the surrounding airflow to form a flowing air column.

Liang Yuan looked at his parents admiringly, thinking that these two were really a perfect match. The foreigner had been tinkering with things for several years, but in one night, the two of them made a draft come out.

Li Yuanling pulled Liang Yuan into her arms, kissed her hard, and said, "No wonder the teacher said that thinking is the most important thing in the field of aviation engine design, and then the material. My mother has been working on aviation engine design for half her life, but she never thought that she could remove the internal channel and leave it as an electric fan."

Liang Yuan smiled and said, "Mom, I just have an idea. Don't say I invented this thing. Now, looking at the sketch you and dad made, if you two don't explain, 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 intake amount and air flow rate of the jet port, etc.."

Comrade Lao Liang, who was equally excited, then said: "You have to choose the right materials to make hollow rings and find a motor suitable for working under closed conditions. Your mother also has to design an efficient air intake fan."

The excited family of three surrounded the leafless electric fan and discussed the sketch until the second half of the night before going to sleep helplessly.
Chapter completed!