These vehicles, including automobiles, ships, airplanes, trains, and so on, can be manufactured to quickly transport large quantities of soldiers and supplies to various parts of the continent.

So, how do you make it? Qian Fei'er lightly tapped her fingers on the side of her face.

First of all, whether it is a diesel engine or other forms of internal combustion engine, it must be inseparable from combustion, because they all have one thing in common, that is, smoke!

Moreover, the smoke is not water vapor, but a little black, and even some are directly thick black smoke.

Since there is black smoke, it means that it contains carbon, because only carbon will appear black.

In addition, the fuel of the internal combustion engine is petroleum extract, which contains a large amount of carbon, which also confirms this.

So, how is its thermal energy converted into kinetic energy? What is the structure of the principle?

Qian Fei'er thought quietly and thought of the steam engine.

The distance of the steam engine is very simple, the fire is burned under the iron pot, the water is boiled on the top, the water boils and becomes steam, the steam pushes the piston above, and the piston connects the gears to provide mechanical kinetic energy.

In this case, the heat energy changes the water from a liquid to a gaseous state, increasing the atmospheric pressure in the pot.

The pressure above the piston remains the same, the lower part becomes larger, the upper part remains the same, and the lower pressure becomes larger to form a strong thrust, pushing the piston to the side with less pressure, that is, the upper movement.

Well?

Qian Fei'er's movements suddenly stopped.

Pressure? That's right, it's pressure!

She suddenly understood what was going on.

The fuel in the internal combustion engine contains a lot of carbon, which is liquid and even very viscous, close to semi-solid form.

As soon as it is burned, it will inevitably burn from the liquid state and decompose into other gases.

A sudden increase in the volume of the gas will cause an instantaneous increase in pressure, resulting in a strong thrust that pushes to the side with less pressure.

In this case, if the internal combustion engine is connected to a nozzle, and the nozzle is not closed, the pressure outside the nozzle will be less than the pressure inside the internal combustion engine.

The strong thrust will push in the direction of the nozzle with low pressure, and a large amount of black smoke produced by combustion and decomposition inside will also be sprayed, thus forming a visible "smoke".

If you make a turbofan that can rotate in front of the vent, the strong horizontal thrust can push the turbofan to rotate at high speed, which is the formation of a fuel motor.

At the same time, the fuel tank and the internal combustion engine can be separated, and a valve that can adjust the amount of oil can be adjusted in the middle, which can be made into a device like the accelerator of the car, which can adjust the size and rate of combustion in the internal combustion engine, so as to adjust the speed of motor rotation.

Another point is that because the internal combustion engine has to burn fuel violently, it must be made into a state of high temperature resistance and high pressure, which also confirms why some diesel pumping engines have thin fuel tank walls but heavy cores.

Just, where to find the fuel?

Qian Fei'er frowned.

There is definitely such a thing as oil in Douluo Continent, Douluo Continent has existed for more than a million years, and there are all kinds of soul beast bones and animal corpses.

These remains are buried deep in the ground and sealed at high pressures for tens or millions of years before they can form oil.

With Qian Fei'er's strong mental power, it is not difficult to search and excavate oil, and in some places there will even be oil on the surface.

It seems, it's easy to get......

But......

Qian Fei'er can't refine oil!

It stumped her.

The oil extracted directly is dark black, which cannot be directly used as fuel for the internal combustion engine, which contains a large number of impurities, and the combustion will form a very heavy carbon deposit, and the internal combustion engine will be damaged after a few strokes.

The method of sedimentation filtration can filter out the top layer of light oil, and the method is not difficult, just use the soil method of water injection.

After injecting water, the oil will be separated from the water because it does not melt into the water.

At that time, the heavy oil will fall, the light oil will float, and some of the oil will be in the middle layer, which can be easily separated by soul control.

It looks easy!

But...... Qian Fei'er didn't want to do this!

The oil filtered out in this way only distinguishes between heavy oil and light oil, and if it is burned directly, it is still likely to cause a big problem.

She didn't want to fix and maintain a bunch of internal combustion engines all day, which would exhaust herself.

Are there any alternative energy sources?

Qian Fei'er thought to herself.

How about using the soul guide that Martial Soul City absorbed the Purple Flame Divine Dragon before?

Qian Fei'er immediately shook her head.

Well, no, no, although the flame temperature of the Purple Flame Divine Dragon is high, it can also burn, but the combustion does not decompose to produce gas, that is, it cannot instantly increase the internal pressure.

If the pressure cannot be increased, the kinetic energy cannot be converted, and the motor cannot be rotated.

So, what do you use without the soul power on the soul guide and without oil?

Well......

Qian Fei'er thought quietly, and tapped her cheeks with two fingers.

All fuels, oil...... Fish oil...... Paraffin...... Carbon monoxide...... Natural gas...... That's right, gas! balance

Qian Fei'er had a flash of inspiration in an instant, and her excited eyes opened.

Natural gas, the main component of which is methane, is a very high-quality fuel resource.

Like oil, liquefied natural gas can be made into a "fuel tank", the bottom is connected to an internal combustion engine, and the size of the combustion is adjusted with the throttle.

Natural gas is similar to oil in that it produces a large amount of gas, which instantly increases the pressure inside the internal combustion engine, forming a strong thrust.

Moreover, the combustion of natural gas basically produces carbon dioxide and water, which is much cleaner than oil, and the smoke emitted is not black, which can be said to have many benefits.

The only drawback is that LNG must be kept in a high-pressure illusion, because natural gas can only remain liquid at high pressure, and will instantly return to gas when it leaves high pressure.

Another point is the source and extraction of natural gas.

Natural gas and oil, like oil, are formed by the remains of ancient organisms buried at high pressures.

It also often coincides with the place where oil appears, and where there is oil, most of the time it is accompanied by a large amount of natural gas.

So, is it time to start a massive exploration of natural gas storage sites, for extraction?

Qian Fei'er put down the two fingers that had been tapping her cheeks before, and prepared to touch the soul guide bracelet.

But at this moment, her eyes suddenly lit up.

Why do you need to explore and excavate, the entire Heaven Dou City, isn't there much?

The main component of natural gas is methane, and the main component of biogas is also methane, which only needs to be dug in large quantities of toilets all over the city and even across the country, and the manure discharged by all residents plus cow, sheep and horse manure can form a large amount of methane in an instant!

In addition, biogas can also be used for cooking, directly replacing dry firewood.

If you don't burn dry firewood, the air environment of the Heaven Dou Empire will definitely become better than ever, and at the same time, it can also solve the problem of "pulling" among the five major problems of eating, drinking, and sleeping among the residents.

The current Heaven Dou Empire, the problem of pulling should not be underestimated.

Fortunately in the countryside, in the city, the first thing residents do when they get up is not to brush their teeth, but to brush the toilet!

After a night, more or less, many residents will produce some excrement.

Take Heaven Dou City as an example, Heaven Dou City is a megacity with millions of people, and the amount of excrement produced by its residents every day is staggering, tens of thousands of tons!

It's good that it's close to the city gate, and it is poured directly into the moat, the moat of Tiandou City is very wide, and there is a lot of water, so there is basically no big smell left.

But the residents in Heaven Dou City who don't rely on the city gate are not so good.

They dumped the night's excrement into the nearby canals, leaving the whole city smoky and stinking.

In ancient China of Lanxing, there was a similar situation in Hangzhou during the Southern Song Dynasty.

At that time, a large number of guards and residents lived by the West Lake, and when they got up early in the morning, almost all the residents went to the lake to wash toilets, drink horses, and so on.

For a while, the smoker was dizzy and couldn't even figure out the direction.

The famous poet Lin Sheng once described it like this: The warm wind smokes the tourists and makes Hangzhou Bianzhou.

Many people thought that this sentence was a praise for West Lake, but the real situation is that Mr. Lin Sheng was so smoked that he couldn't even figure out the location.

When you think about it, this digester is really wonderful!

Qian Fei'er's heart moved, and the corners of her pretty face hung up on both sides, with a faint smile.

She got up, walked to the sofa, sat down cross-legged, and entered the cultivation.

Night, quietly passed......

The next day, the Soul Hall and the Heaven Dou Empire jointly issued a decree.

The decree clearly states that a large number of toilets will be dug up throughout the country and biogas digesters will be built.

The excavation work is assisted by the soul master of the Wuhun Palace, and there is a special atlas.

In addition to the toilets, all biogas digesters also need to pour the manure of all cattle, sheep, horses, chickens and other livestock into the house.

The biogas produced in the biogas digester can be used for residents to cook on fire, and the remaining biogas is collected by the soul master sent by the Wuhun Hall to the soul king and above, compressed into the high-pressure bottle, and stored in a centralized manner.

All collected biogas near Heaven Dou City must be stored in the Heaven Dou City Imperial Palace, and must not be left outside.

After the biogas is collected, the biogas residue in the digester is used to fertilize the fields and is disposed of by the residents themselves.

As soon as the decree came out, the people immediately rejoiced, there was a state to help dig toilets for free, and you can also see the soul masters who were high up in the past, and even the soul king came to dig them, which is definitely a joyful thing.

For a time, the whole country of the Heaven Dou Empire celebrated with crowns, ran to tell each other, and the residents put up lanterns, sang and danced, just like the New Year!

It's only hard to suffer those soul king-level soul masters, not counting digging toilets, but also using soul power to protect their bodies and go to the stinking biogas tank to collect biogas.

And all this is just to make fuel for Qian Fei'er's internal combustion engine......

This went on for a month.

A month later, Heaven Dou City, in the afternoon, at the gate of the Imperial City.

Countless residents stood in front of the Imperial City, looking curiously at the open space blocked by a group of Heaven Dou heavy armored infantry in front of them.

In the clearing, there was a car that had never been seen before.

The car had four wheels and a compartment, but the front of the carriage was a little flat, and ...... No Malara!

The carriage and wheels are dark black, thick and luxurious, and the exterior reflects a translucent luster in the sun, which is very new at first glance.