I want to know about what happened when gun fired in details,

[lemd]

Hi all,

I want to know in detail about gun, especially the properties of gas with hight pressure like in gun's barrel. Could you give me some free useful things?

Or just answer me some question:
1 When firing, from the beginning of the explosion until the bullet leaves the barrel, how pressure of gas is changing?
2 How gas does when meet another low pressure way, like a tube leading the gas back in automatic assault rilfe? Is the pressure contact the bullet still the same as in case there isn't any tube leading gas back? And how is pressure in that tube, equal the barrel or not? I think when meets low pressure way like this, at first, gas will transmit almost all it's pressure to that way until two ways have the same pressure, right?
3 And how fast does gas changing it direction when meet another way? I remember that gas's pressure transmit in all direction, so when meet another ways, it immediately change direction with full pressure, correctly? And when in hight pressure and very fast process like this, is it still considered immediately, in comparison with the movement of the bullet?

 

[LURCH]

1) Wjen the gunpowder ignites, the bullet is sitting still. As more and more powder burns, the gasses released attempt to expand, but the itnertia of the bullet means that it cannot start moving immediately, nor get to its top speed as soon as it starts moving. So, as the volume of gass continues to increase at a rate greater than the rate at which new space is provided by the bullet's motion, pressure continually increases. But the bullet does get moving in a pretty big hurry, and the burn of the powder is fairly quick. So, probably by the time the bullet is 1/4 of the way down the barrel (not sure how far), pressure is decreasing. However, pressure is still greater than atmospheric, so the bullet is still accelerating even though pressure is decreasing.

 

[sir-pinski]

Hi there,

Thanks for your question about guns and the properties of high-pressure gas in the barrel. The process of firing a gun can be broken down into several stages, each with its own unique characteristics.

1. When firing a gun, the trigger is pulled, causing the firing pin to strike the primer on the back of the cartridge. This ignition sets off a small explosion, which creates high-pressure gas inside the cartridge. This pressure rapidly builds up, propelling the bullet forward out of the barrel.

2. As the pressure builds, it pushes the bullet forward and also expands outward, forcing the walls of the cartridge to expand and seal the chamber. This creates a tight seal, ensuring that all of the gas is directed towards pushing the bullet out of the barrel.

3. The pressure of the gas continues to increase until it reaches its peak, known as the peak pressure. This is the point at which the bullet is moving at its highest velocity and the gas is exerting the most force on it.

4. As the bullet travels down the barrel, the pressure starts to decrease as the gas expands and escapes through the muzzle. This decrease in pressure is known as the pressure curve.

5. Once the bullet leaves the barrel, the pressure drops drastically and the gas is released into the atmosphere, creating the loud bang that we associate with firing a gun.

To answer your specific questions:

1. The pressure of the gas increases rapidly from the moment of ignition until it reaches its peak pressure. This happens very quickly, usually within milliseconds.

2. In automatic rifles, some of the gas is redirected back into the action to cycle the next round. This gas is at a lower pressure than the gas in the barrel, but it is still enough to operate the rifle. The pressure in the barrel and the gas tube are not equal, but the gas tube is designed to handle the amount of pressure that is redirected into it.

3. The gas does change direction very quickly when it meets another way, such as the gas tube in an automatic rifle. This is because the gas is expanding rapidly and has a lot of force behind it. However, this change in direction is not considered immediate in comparison to the movement of the bullet, which is traveling at a much higher velocity.

I hope this helps to answer some of your questions about guns and the properties of high-pressure gas. Let me know if you have any other questions.