Bright Sword starts with the grenade flat.

Chapter 258 Rotating Pulse Detonation Engine

Liu Xiu looked at Liu Qin's last words and consoled him:

"Dad, it's just a nosebleed! Why are you saying your last words?"

However, when Liu Xiu comforted Liu Qin, he opened the map of enemies and friends, and then did a fluoroscopy of Liu Qin's brain. However, the result was not optimistic because the cause of Liu Qin's nosebleed was actually a ruptured blood vessel in Liu Qin's brain. .

That's why intracranial high pressure caused Liu Qin to have nosebleeds and look rosy.

………………

Liu Qin finally left, leaving without regrets, and Liu Xiu had no plans to bury Liu Qin's ashes, because he planned to take Liu Qin's ashes to Mars for burial according to Liu Qin's last words.

After simply organizing Liu Qin's funeral, Liu Xiu devoted himself to the follow-up research and development of the pulse detonation engine.

Because the pulse detonation engine in Liu Qin's laboratory is just an experimental verification machine, its thrust is not very large.

Therefore, it was naturally impossible to install this pulse detonation engine directly on the space station. Liu Xiu had to make an enlarged version according to the principle of making this engine.

It takes at least eighty explosions per second to produce continuous and coherent thrust, so Liu Qin was stumped by this before, because it is really difficult to control high-density and continuous explosions mechanically.

The structure of the entire rotating pulse detonation engine is actually not complicated, even simpler than the turbojet engine!
There is a circle of rotating ignition holes at the bottom, and then a detonation wave is ejected from the inside. This detonation wave is then used to ignite the combustible gas in the combustion chamber.

Liu Xiu was also very impressed by the exquisite structure of the rotating pulse detonation engine designed by Liu Qin.

This is somewhat similar to using a detonator to ignite TNT, because if you don't use a detonator to detonate it, but use fire to ignite it, then the TNT will not explode but burn.

And those cloud bombs with the same fuel first mix combustible substances and air to form flammable gas, and then use explosives to detonate them to become cloud bombs.

Although burning TNT can cook rice and other things, only exploding TNT is good TNT.

And this is naturally much simpler than Liu Qin's previous development of pulse detonation engines. After all, one is from scratch, and the other is from one to two.

It's just that the fuel in the rotating pulse detonation engine also explodes, but in order to generate sustainable thrust, the explosion must be continuous rather than sudden.

Fortunately, Liu Xiu has advanced computers to the level of integrated circuits, so it is much easier to use computers to control ignition frequency, just like cars changing from carburetor cars to EFI cars.

Of course, the most critical thing is that the rotating pulse detonation engine is a real change, because it turns combustion into explosion. Although explosion is considered combustion, explosion is a constant pressure combustion in physics, while ordinary combustion is It is a constant volume combustion.

In fact, there is no difference in the chemical reaction between constant volume combustion and constant pressure combustion, because the chemical residues after they are burned are the same, but the fuel utilization rate of constant volume incendiary combustion is only 27%. , while the fuel utilization rate of constant pressure combustion reaches 49%, and the fuel utilization rate of the two differs by 55%. Of course, the combustion efficiency here refers to the combustion utilization rate of the fuel, that is, how much fuel participates in the reaction and is burned, rather than the thermal efficiency of the engine, because the thermal efficiency indicates how much heat is generated after burning so much fuel. Take advantage of it.

Therefore, the thermal efficiency of a certain engine has exceeded 40% and the combustion efficiency are two different concepts.

However, the biggest difference between combustion and explosion is their burning speed. For example, the burning speed of gasoline in the cylinder is only ten to twenty meters per second, while the burning speed of gasoline when it explodes can reach one thousand, five hundred to fifteen hundred meters per second. Two thousand meters per second.

The cylinders of such explosive combustion engines cannot tolerate such explosive combustion, so various things are added to the gasoline to prevent knocking, so gasoline has labels like 92, 95, and even 97.

High-grade gasoline corresponds to high-performance cars. Because such cars pursue greater horsepower, the compression ratio is larger, so they need higher anti-knock gasoline. After all, if a detonation occurs, If the car's engine explodes, it will be a huge loss.

But this kind of fuel utilization rate is eye-catching. For example, if the Falcon rocket uses a pulse detonation engine instead of a rocket engine, it can save at least one hundred tons of fuel and achieve the same transportation effect. .

Or in other words, the Falcon rocket, which was originally required to transport only more than 20 tons to low-Earth orbit, can easily transport more than 100 tons of materials to low-Earth orbit after switching to this engine.

Then coupled with the technology that can be recycled, this will make going to space as economical as flying.

One year later········

"Console, console, let the rocket rise to 100 meters in the air and hover for ten minutes before landing!"

"Console received, console received! Start ignition now!"

Under Liu Xiu's order, the rocket equipped with the rotating pulse detonation engine began to ignite, then slowly lifted off, and finally began to hover after reaching an altitude of 100 meters!
Although this set of actions looks simple, Liu Xiu, who participated in the design, knows how difficult it is to control the rotating pulse detonation engine, because the thrust control of the rotating pulse detonation engine is much more difficult than the thrust control of the rocket engine.

Because of this, it took Liu Xiucai more than a year to design a rotating pulse detonation engine that could freely control the thrust.

This was not because this rotating pulse detonation engine could be successfully used in rockets. Liu Xiu's hair had turned white and he couldn't help but his brain was in great need of nutrition after entering a state of explosive thinking, so Liu Xiu immediately became cruel. All the nutrients supplied to the hair are intercepted.

Regarding the graying of Liu Xiu's hair, Qin Huairu was so distressed that she shed tears, and then made some black sesame paste for Liu Xiu to eat every day, hoping to make up for it.

But what Qin Huairu didn't know was that the graying of his hair was controlled by Liu Xiu himself. After all, after reaching the peak of martial arts, he could naturally control whether his hair would turn gray easily.

And Liu Xiu also found that when the hair no longer received nutrients, the brain worked faster, so later Liu Xiu simply stopped doing it and made himself bald, which could solve the problem. Because of the heat dissipation problem in the brain after thinking.

PS: Regarding cutting-edge technologies such as pulse detonation engines that are still in the laboratory, I searched online for more than three hours, but it was really difficult to find relevant accurate information, so this chapter is combined with some one-sided information and added I wrote it based on my own speculation, so please don’t read it with your brain!
No way, if I could make a pulse detonation engine, what novel would I write? JPG
In addition, don’t look forward to it if there is no chapter 259. I can’t change it, so let’s use your imagination! This kind of article is really difficult to write, even though many defensive measures have been used!

(End of this chapter)