Moonbogg wrote:Technician1002 wrote:Moonbogg wrote:Discussing the use of oxidizers isn't against forum rules as far as I am aware. Whats the difference between combustion and explosion? When you say explode, do you mean chamber failure? This cannon will be able to hold at least 2,000psi so I am not too worried about mapp gas and oxygen causing it to explode.
The definition of a detonation vs a combustion. The detonation may cause chamber, barrel or other failue.The sudden and violent release of mechanical, chemical or nuclear energy from a confined space which creates a shock wave that travels at supersonic speeds. Often used interchangeably with explosion.
Right. The cannon chamber and end caps are going to be so overkill I can't possibly immagine it ever failing. OK i'll spill the chamber specs and tell me what you think.
3" SCH80 6061-T6 chamber x 12" long
1/2" thick 7075-T6 end caps (much stronger than 6061-T6)
secured with 6 #8 machine screws per cap to chamber.
It would take one hell of a blast to cause that beast to break apart. The barrel is 1 1/2" SCH10 6061-T6.
Have you seen a piston from a car that has had severe pinging? This is the result on a small scale what you want to do on a large scale.
These shock waves break things.
Knock is best defined and identified as the sound associated with vibrating pressure waves created by the burning of some part of the mixture in advance of the normal flame front. The abnormal burning in advance of the flame front creates a measurable rise in pressure that is always steeper and often earlier in the combustion cycle than normal. Under some conditions, this gradual pressure rise becomes a pressure spike with a peak value much higher than normal. This is illustrated here.