Into Unscientific Chapter 172

  Chapter 172 "About the things about me rubbing the plane with my hands after the Song Dynasty coup" (6.8K)

   Throughout the long history of human civilization, the ancestors have almost never stopped looking up at the sky.

  Why do human beings yearn for the sky?

  Before Xu Yun traveled to the Song Dynasty, he heard an explanation starting from the particles of matter:

   Well known.

  All the elements in the universe come from supernova explosions.

   It produces everything you can see in the physical world, including yourself.

   The atoms that make up your left hand may come from different stars than the atoms that make up your right hand.

  When you look up at the stars.

   What your eyes are looking at may be the very matter of the galaxy that makes up your eyes.

  Your thoughts are racing, your brain cells are sending nerve impulses.

  Every transmission of nerves may be the first handshake between matter across galaxies.

  You look up at the sky.

  Because you are originally from the sky.

  Xu Yun doesn't know whether this kind of statement that is tenable in science can be applied to the field of idealism, but he is very clear about one thing:

  In the long history of civilization in China.

   Indeed, countless ancestors have expressed their longing for the sky either through words or through practice.

  For example, Jin Wang Xizhi wrote in "Lanting Collection Preface":

   "Looking up at the vastness of the universe and looking down at the prosperity of the category, so wandering around the eyes and mind is enough for audio-visual entertainment, and you can trust CocCola."

   There is also Li Bai's "Yuan Danqiu Song":

   "Long circle, follow the star rainbow, ride a flying dragon and hear the wind, cross the river across the sea and connect with the sky, I know that your mind is boundless."

  In these poems.

  The authors have directly or indirectly expressed their desire to fly to the sky, and even expressed their attitude towards life.

  Looking down on the world from a height, you can live happily.

  And some people are different from Li Bai and Wang Xizhi. They may not have literary talents, but they have a heart to explore.

  For example, Xu Yun is now in the year 1100 AD, the first year of a new century.

   Follow the historical trajectory.

  27 years later, the Jin people destroyed the Northern Song Dynasty, and the two emperors were taken away.

  One hundred and thirty years later, the Yuan Dynasty destroyed the Southern Song Dynasty, and the mountains and rivers fell to foreigners.

  But the Yuan Dynasty lasted less than a hundred years, and the sun and the moon will reopen the Great Song Dynasty.

  At that time, there will be another Wanhu named Tao Chengdao.

  Tao Chengdao is proficient in gunpowder and made great contributions in the process of Zhu Yuanzhang conquering the world, but he himself has always been full of curiosity about the sky.

  Finally in 1390 AD, Tao Chengdao made a decision:

  He wants to fly!

   According to Tao Chengdao's plan.

  He will tie 47 rockets to the back of the snake-shaped seat, and use the gas produced by the combustion of solid explosives in the rocket to erupt outward.

  The rocket will fly forward due to the reaction force of these gases, and several rockets are tied to the seat, which will drive the seat and the rocket to travel together.

   In this way, he will be pushed into the sky by the thrust of the rocket while sitting on the seat.

   Other than that.

  He also arranged two huge kites on the seats.

   This can not only make him continue to fly, but also make him land smoothly.

  The famous Qian Lao in later generations once described the scene of Tao Chengdao flying into the sky in this way:

"At that time, his servants were terrified, but when faced with the worries of the people around him, Tao Chengdao looked up to the sky and laughed and said, Flying to the sky is my long-cherished wish for thousands of years in China. Later generations have broken out a road to explore the sky. You don't have to be afraid, come and light the fire quickly!"

   Seeing this, the servants had no choice but to light the fire according to Tao Chengdao's request.

   After a while.

   With a loud bang.

   Tao Chengdao was carried into the sky by the thrust of the rocket.

  Following the second stage plan designed by Tao Chengdao, the gunpowder was ignited to continue to increase the height of the installation.

  However, just as the disciples and servants on the ground were cheering for joy.

   Only an explosion that shattered the eardrum was heard.

  In the sky, Tao Chengdao and his device turned into a fireball, quickly falling from the sky...

  The first human "astronaut" who wanted to use the thrust of a rocket to go into space died, and Tao Chengdao's disciples and servants buried him on Wanjia Mountain...

  But Tao Chengdao passed away unfortunately on the way to pursue his dream.

  His heroic deeds have been inspiring generation after generation of astronauts in our country, and he has also won the recognition of the aerospace industry in the world today.

  Internationally recognized that he is the first pioneer in history to use a manned rocket to try to fly into space. The International Astronomical Union also named a crater on the moon "Wanhu" to commemorate this great man.

  If it is said that Wang Bao, Zong Ze, and Zhang Shuye represent the integrity of China.

  Then Tao Chengdao embodies the spirit of seeking knowledge and exploration of the sages.

   Among these sages, Lao Su, the greatest scientist in the 11th century, is naturally indispensable.

   Whenever he looked up at the sky, he would have an idea in his mind:

  If people can fly to the sky and overlook the ground, what a wonderful scene it would be.

  Magnificent mountains and rivers, all kinds of world, can be fully seen.

   So a long, long time ago.

  He tried to make a wooden kite, trying to use the wind to achieve the effect of going up to the sky, trying to conquer the sky.

  However, due to the lack of sufficient knowledge and theory, the idea of ​​wooden kite ascending to heaven ended in failure.

   Now that his body is getting old, Lao Su already has a premonition in his heart:

  My time is running out, and this obsession probably has no possibility of realization.

  I may only be able to leave the world with regrets in a year or two

   But what he didn't expect was.

  With the appearance of Xu Yun, some things seem to have changed indistinctly

airplane?

   Refers to the flying wheel, or the flying machinery?

  No matter which of the above possibilities, can it really take a person to the sky?

To know.

  An adult's weight ranges from a hundred catties to more than two hundred catties.

  Counting the weight of the load, the most conservative estimate is more than 200 kilograms, right?

   Such a heavy object, why can it fly?

  But Xu Yun has already proved his ability before, so the credibility of his words is not low.

   Then Old Su paused. Considering the importance of 'Auspiciousness', he decided to learn more about the inside story:

   "Xiao Wang, is there a principle that can explain the plane you mentioned?"

   "Principle"

  Xu Yun thought for a while, and took out two pieces of paper from his body—as mentioned earlier in Fan Lou, he always carried paper and pen with him.

   Then he held one end of the paper with both hands, letting the paper hang down naturally.

   asked Lao Su and Xiao Zhao:

   "Your Highness, Master, do you guys still remember the experiments you did in class?"

  Old Su and Xiao Zhao looked at each other with thoughtful faces, and said after a while:

   "Of course I remember, it seems to be called Bernoulli's principle, right?"

  Xu Yun nodded:

"good."

   Then he paused and continued:

   "Your Highness, sir, since the two of you still remember Bernoulli's principle, is there a certain possibility?"

   "For example, change the paper into a fixed object, and use techniques to make it produce a huge difference in the gas flow rate between the upper and lower sides."

   "In this way, can objects be lifted into the air like a piece of paper floating?"

  Students with good memory should still remember.

  When Xu Yun first met Xiao Li, he once demonstrated an experiment of blowing paper for her.

  Later, Xiao Li specifically asked Xu Yun about this in class. For the convenience of explanation, Xu Yun demonstrated another experiment in high school:

  Hold one end of the paper with both hands, let the paper hang down naturally, and then blow air into the middle of the two papers.

   Then blow and blow and you will find out.

  The two stickers are actually together.

  In high school textbooks, the above two experiments will be attributed to Bernoulli's principle:

  Look, the flow rate above is high and the pressure is low, so the pieces of paper float up.

   But actually.

This is wrong.

  Xu Yun's paper blowing demonstration to Xiao Li had nothing to do with Bernoulli's principle at all.

  Actually, this is also a misunderstanding of the most widely circulated Bernoulli equation.

  Considering the information barriers of some idiots, ahem, lay readers, a brief summary is:

  The Bernoulli equation is established along the same streamline, not between different streamlines.

  The direction in which the paper sheet deviates does not depend on which side the airflow is at all, but depends on the angle between the direction of the airflow and the paper sheet, and the viscosity.

   A start.

  The piece of paper droops vertically.

  Blowing air above the paper will take away the air on the right side of the paper due to the viscosity.

  In this way, a low pressure zone will be formed.

  Due to the existence of this low-pressure zone, the paper will float to the upper right.

  When the piece of paper floats, it will bend the streamline downward.

  In turn, it will eventually make the streamline and the paper stick closely.

   At this time, the air flow is no longer straight forward, but a downward arc, which is a whirl field.

  Therefore, the downwardly bent streamline will generate centrifugal force, and this centrifugal force will bring the paper up.

  The real name of this effect is the Coanda effect, not the Bernoulli principle.

   Pretty simple and easy to understand, right?

   But in the high school classroom.

  When it comes to the principle of airplanes, not only can the teachers not explain the Coanda effect (in fact, quite a few people may not even know that they are wrong), but they often extend the above paper example again.

   That is, replace the piece of paper with a wing:

  For the wing, the upper surface is more convex, and the speed of the airflow will be greater when passing the upper surface.

  So there is also a pressure difference, which is the source of the lift.

  The above explanation plus the paper experiment, most people suddenly understand the principle of the plane flying in the sky:

  Oh, the principle of the plane is so simple...

  So ever since.

  A situation of repeated mistakes appeared-the principle of the aircraft is Bernoulli's principle.

  Actually, if you are willing to think about this statement, you can easily think of two rebuttal questions:

  First, why can the aircraft in the air show fly backwards?

  Second, a kite is just a big flat plate, why can it fly without power?

Of course.

  I want to think about these two questions, and it is not recommended to refute the teacher in class.

  Otherwise, it is very likely that you will be rewarded with a penalty station and copying homework, and you may have to be criticized by the head teacher.

all in all.

So far, including Bernoulli's principle, including Newton's third law, including the Ventley effect, including the KutZhukovsky law, and many improved laws, it is actually difficult to explain perfectly lift problem.

  Why airplanes can fly is still an unsolved mystery.

  It is said that the Nobel Prize is far away. In fact, if many common phenomena in life can be successfully explained, the Nobel Prize is almost at your fingertips.

But on the other hand,

   It is still a sentence mentioned a long time ago:

  The Song Dynasty is not the 21st century. For the basic cognition of this era, some concepts do not need to be completely correct.

  A more general explanation is easier for people to understand.

  So when Xu Yun explained the reason, he directly applied Bernoulli's principle to the piece of paper.

   That is, in a flowing fluid, the greater the flow velocity, the lower the pressure.

  Now, in order to save some trouble, he continued to extend the paper to the wing, and still put the hat on the Bernoulli principle:

   "So if we can provide a large amount of propulsion in a short period of time through some means, it is possible to send the plane into the sky."

   "If Cao Min remembers correctly, there is also a skill called the megaphone in the Fenglingyue Shadow Sect."

   "This object is not big, but it can amplify the voice of ordinary people several times, and it is not troublesome to reproduce it."

   "At that time, if His Highness can fly by plane and speak to the people through the loudspeaker, there will be no need to worry about the residual influence of the abolished emperor."

  After hearing Xu Yun's words, Xiao Zhao's eyes lit up.

  Although in the legends of the past dynasties, every emperor seems to have a supernatural power.

  For example, Liu Bang cuts the white snake, Gao Huan's red light and purple aura, etc. It seems that you can't be an emperor without any vision.

  But there is one thing to say.

  These so-called visions are basically rumors that only emerged after he ascended the throne, and their authenticity is doubtful.

  The miracles that really appear in the public eye have always been very rare, and even if there are, there is a high probability that they are just coincidences.

  But if he could fly high into the sky during the enthronement ceremony and say 'thunder', that would be a real vision in public!

  The effect is absolutely infinitely higher than any amnesty. In the game, it is the bug effect of +40 people's hearts!

  Think here.

  Xiao Zhao suddenly couldn't sit still, and quickly asked Xu Yun:

   "Prince Wang, I don't know the geometry of the materials needed for the aircraft, and how long it will take to make it?"

  Xu Yun immediately put on a pensive expression when he heard the words.

be honest.

  Although he is an old oilman in the DIY circle, it is still difficult to build an airplane by hand in the ancient background.

   Just according to the halo prompt.

  The heaviest rating of the task is related to the technical difficulty, so he had to propose the concept of the aircraft, otherwise just build a hot air balloon and the job will be over.

   Speaking of aircraft, the first thing to mention must be the type.

  Generally speaking, aircraft are mainly divided into two types: jet aircraft and propeller aircraft.

   Among them, the propeller plane is the most primitive powered plane, and it is also the kind we see in old movies and documentaries.

  It mainly uses the rotation of the propeller to push the air to the rear of the aircraft, and uses its reaction force to push the aircraft forward.

   According to the different power, it can also be divided into piston aircraft, turboprop aircraft and so on.

  However, some aviation enthusiasts will separate the piston aircraft as a third independent definition of aircraft-the number of these people is not large, and it can only be regarded as an unpopular genre.

Of course.

  Although propeller aircraft has a long history, it has not completely withdrawn from the aviation stage. The proportion of active service is about 20%.

  Jet aircraft is the current mainstream model. Most of the civil aviation airliners we take now are jet aircraft.

   Compared with propeller aircraft, the classification of jet aircraft is more complicated.

   For example, it can be divided into turbojets, turbofans, turbopropellers and turboshafts, etc.

   But don't look at the plane as if it's very tall. If you don't consider the score, there are several types of hands that are quite easy to rub.

   Such as a very simple pulse jet engine.

  The English name of this thing is also called Pulsejet. It was specially used to launch V1 missiles during World War II, and it only hit John Bull.

   Although in the eyes of modern people.

  Pulsejet has low power, high vibration and noise, unstable operation, short life and uncontrollable output power controllable range is very narrow.

  But from a technical point of view, the pulse jet engine is too simple:

  Its main component is a pipe, not even a seamless steel pipe.

   Plug the front of the pipe with a one-way valve to let air in, insert an oil pump and igniter and you're done.

   When starting, use compressed air to flush the front valve, and then cooperate with the ignition, it can be started in an instant.

  Xu Yun used three or four simple Pulsejets in his previous life, and the thrust-to-weight ratio is as high as 500+.

  However, considering that this kind of untechnical design does not have enough gold content, the probability of scoring is not too high. It is estimated that it may be better than a hot air balloon.

   So Xu Yun hesitated again and again, but still made a bold decision:

   Design an engine yourself!

be honest.

   This is undoubtedly a very difficult approach.

  Although Xu Yun is familiar with internal combustion, he was also in charge of related research in Chengfei after graduation in his previous life.

   But say one thousand and ten thousand, this is the Song Dynasty after all.

   There is no supercomputer, no sophisticated production equipment, and the conditions of later generations are very different.

   Other than that.

  Flow field analysis, compressors, turbines, rotor synchronization, clearance control, fuel oil, bearings, and even the shape of the combustion chamber are all inaccurate.

   On the contrary, the extremely difficult blade processing of later generations can be relatively easy. After all, it is only a short time to cope with the enthronement ceremony.

  Based on Da Song's current skill level, it is quite easy to pile up a set of blades with a lifespan of 60 hours with money.

  But the whole process was difficult, but Xu Yun had an inexplicable premonition in his heart:

   The score of this task is very important, the higher the better, it must not be perfunctory.

  This premonition even made him feel a little heavy, as if.

  The beneficiary is not only him.

  Think here.

  He raised his head involuntarily, looked at Xiao Zhao, and said:

   "Your Highness, if you want to build an airplane, the grassroots may need a lot of manpower and material support."

  Xiao Zhao waved his hand generously, he is not a person who talks about it:

   "Prince Wang, just open your mouth!"

  Xu Yun thought for a moment and said:

   "First of all, there are a large number of iron ore, craftsmen with basic skills, and a suitable preparation site."

   "The second is some rare resources, such as falling stars, and the more the better."

  The so-called falling star refers to the meteorite.

   In addition to iron and nickel in meteorites, there are opportunities to find some other rare metals.

   Although the content of these metals is not necessarily particularly high.

  However, the amount of meteorites accumulated in the treasury of the Song Dynasty should be quite a lot. In theory, there is a high probability that some special resources can be obtained.

  As Song Zhezong's younger brother, Xiao Zhao knew a little about some storage items in the palace, so he readily agreed:

   "There are about hundreds of falling stars in the palace. The small ones are no more than the size of a nut, and the big ones are as big as a water tank."

   "If it's still not enough, this king can still contact the aristocratic families in various places, and it will definitely meet the needs of the young master!"

  Xu Yun nodded in satisfaction, and continued:

   "In addition, there are a large number of bachelors in mathematics, such as Mr. Tong Yu, etc. The more the better."

   "As for the time, it will take at least six or seven months."

   "Six or seven months."

  Xiao Zhao repeated the time and turned to look at Lao Su.

  Old Su thought for a moment and said:

   "His Royal Highness can take charge of the government temporarily as a state supervisor, not to mention half a year, a year is also fine."

  Xu Yun nodded slightly, the answer was within his expectation.

   After all, Xiao Zhao has to spend time to accept Zhao Ji's remaining power, which is not so easy.

  Even Zhao Ji, who was well-known in history, took more than half a year to get it done.

   Then he suddenly thought of something, and added:

   "By the way, there is one more thing that needs to be prepared."

"What?"

   "That donkey from the Su Mansion."

   The copy of the Northern Song Dynasty has entered the final finishing stage, and the rewards will be very special. It feels so cool to know the plot before the readers (laughs)

  (end of this chapter)

Chapter end