Rising: Ten Thousand Years Chapter 293: : odd and even
A four-stroke radial reciprocating engine.
What is a four-stroke?
The concept of four-stroke, when they researched the internal combustion engine, they understood it deeply.
The first step: inhalation, the intake stroke.
Second step: the compression stroke.
The third step: workmanship, ignition stroke.
The fourth step: exhaust stroke.
This is a four-stroke.
Four-stroke is far more powerful than two-stroke, and the steam engine belongs to the category of two-stroke.
Four-stroke they understand that this must be the category of internal combustion engines.
But the star-shaped reciprocating engine, this star shape, made them a little bit blind.
The people in the class had a heated discussion for a while, and they all stepped up to the podium to observe the blackboard carefully, but they couldn't help being confused. It seems that I understand it, but it seems that I don't understand it.
Li Zhen asked everyone to go down, and then used chalk to draw a line on one of the corners, saying: "Piston."
Put down the chalk and say, "Every 'horn' you see growing around a circle is a piston cylinder. And when I'm going to tell you about a radial reciprocating engine, I can't avoid another concept: the cylinder. Body."
"What is a cylinder block? Who can answer it?"
A person from the Mechanical Institute stood up and said: "It is the cylinder. It carries the piston, push rod, and transmission rod. One end is connected to the power source, and the other end is responsible for the power output. It is the cylinder block."
Li Zhen asked again: "Why did the previous internal combustion engine have relatively low power? Do you understand now?"
Ma Jianbin exclaimed: "I understand. I suddenly understand, Mr. Li, I understand this picture. Because... the previous internal combustion engine only had one cylinder. If you have to plan it, it belongs to a single cylinder Engine. The one drawn by Mr. Li is a multi-cylinder engine. The single-cylinder engine has only one cylinder to provide power, the reciprocating speed is slow, and the torque is relatively small. But this multi-cylinder engine is powered by multiple cylinders at the same time, and the reciprocating speed It will increase geometrically."
Li Zhenyi clapped his hands:
"Yes, this is a multi-cylinder engine. And the radial reciprocating engine is to squeeze the potential of the four-stroke engine infinitely. For example, if the speed of the horizontal bar engine is five revolutions per second. Then the five-cylinder The speed of the engine can reach at least 25 revolutions per second. Let me ask the most realistic question, do you think the cylinder has a life span?"
"Yes!"
"There must be."
"The piston keeps moving in the cylinder, and there will be wear and tear."
“…”
"A single-cylinder engine, if it needs to work for 400,000 revolutions a day. Then the reverse propulsion proves that the cylinder of this engine will wear 400,000 times a day. If a five-cylinder engine also works 400,000 revolutions a day. The wear of 400,000 times is Use five cylinders to share equally. Theoretically speaking, the service life will be five times that of the horizontal bar engine. This is the most realistic problem. Stability."
"Next, if a single-cylinder engine works at 400,000 rpm, it takes an hour. Then the five-cylinder engine works at 400,000 rpm, and the time required in theory will be shortened by five times. So the speed will be faster. The torque will be Bigger. That's how multi-cylinder engines work."
Ma Jianbin's face was flushed because of surprise, he felt that he had opened his eyes. Why does Master Li have such a long head?
The mobility has been researched to such an extent.
After explaining it clearly, it feels simple, but the difficulty of starting from scratch can be imagined.
With the same power, the power is geometrically increased with just a few more cylinders. Stability, safety, torque, and speed all increase geometrically.
Ma Jianbin exclaimed: "Mr. Li, I already understand the principle. This concept can be regarded as a breakthrough for us. With the concept, the next step is the technical issue of the ending. We will immediately put it on the agenda and start research."
Li Zhen waved his hand: "Sit down first. I haven't finished yet."
"The technical problems of multi-cylinder engines are not as complicated as you imagine. This issue will be dealt with later. In addition, let me say that multi-cylinder engines are not suitable for aviation. Because they are too heavy. The body is complex and huge. If the technology It is mature and can be used to replace steam cars.”
When everyone heard the words, they sat up straight again and listened.
Li Zhen pointed to the picture on the blackboard: "And what I really want to say is the radial reciprocating engine. This is the heart of aerospace. I understand the concept of multi-cylinder engines and understand the radial engine It becomes simple."
"The first few concepts, why I said that the radial engine is suitable for aviation. First, the structure is compact and takes up little space. Second, the weight is light. Third, the power is high in strength. Fourth, the stability Strong, strong safety, and long life. Fifth, the radial engine can even realize double-row star, three-row star, or even multi-row star.”
"The cylinders are arranged around the rotor body. I don't need to emphasize the transmission coupling. What must be emphasized is that the number of cylinders in a radial reciprocating engine must be an odd number. It cannot be an even number."
Liu Jinghong, an outsider, wondered: "Why?"
Ma Jianbin and others were also at a loss. Yes, why is this?
According to this theory, the more cylinders the better, but why must it be an odd number? What does odd and even numbers matter for this engine?
Li Zhen said: "Because the distance is that multiple cylinders surround the rotor and provide power together. Therefore, as long as there are even cylinders, there must be a top-to-top and parallel arrangement in the cylinders. Because the core of the radial engine is, Multi-cylinder shared rotor workmanship~IndoMTL.com~Each cylinder only rotates at a fixed angle.”
"For example, if it is a five-cylinder. Then the rotor rotates one revolution, not five cylinders take turns to make it rotate one revolution. Instead, five cylinders participate in the work every revolution. The first The cylinder turns the rotor one-fifth, the second two-fifths. So presumably."
"So, if the number of cylinders is even. Then there must be a topping phenomenon, which will cause the pistons in the two cylinders to move synchronously. There will be two cylinders participating in the fifth. So As a result, its vibration will inevitably be extremely large. This vibration is undulating and will be fatal."
"So, the radial reciprocating engine must use an odd number of cylinders. For example, five cylinders, seven cylinders, nine cylinders. Two rows of five cylinders, two rows of seven cylinders. Or three rows of five cylinders, three rows of seven cylinders."
“…”
Everyone was fascinated by the sound, and the sound of air-conditioning was heard continuously.
Ma Jianbin drew a draft on paper, drew a rotor, and drew the average emission of ten cylinders. As a result, I used a ruler to measure it, and it turned out that three or four groups of them were parallel. Three or four groups have produced the top phenomenon.
He sucked in a breath of cold air, indeed everything is knowledge. Who would have thought that there would be such a big difference between just an odd number and an even number.
It's just a digital concept. But the story behind it is not so simple.
Liu Jinghong, a layman, was also sweating profusely.
This is science.
How did Li Zhen's head grow?
If he hadn't mentioned these problems before, then the Motor Institute would have some obsessive-compulsive disorder. In order to pursue greater power, he might have to get you an engine with more than 20 cylinders or more than 30 cylinders. In the end, it was actually useless.
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