Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm Allen Mag test rifle finished.....
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="ricka0" data-source="post: 76247" data-attributes="member: 3086"><p><strong>Re: wc872 burn rate</strong></p><p></p><p>[ QUOTE ]</p><p><font color="purple">Not an expert by any means,but your formula is not taking into account the powder burn rates and the area in which they're burned. </font></p><p></p><p>[/ QUOTE ] </p><p>Actually it does take into account burn rate. That's what I'm talking about the integral of the P function (the area under the curve of the graph). The area where they are burned would only matter if you had dirac type impulses, which you don't. The pressure is relatively low compared to high explosives.</p><p></p><p> [ QUOTE ]</p><p> <font color="brown"> Complex high pressure non-equilibrium systems often deviate substantially from ideal gas law behavior.</font></p><p></p><p>[/ QUOTE ]</p><p></p><p>Powder burning is neither. You'd be right for high explosives.</p><p></p><p></p><p> [ QUOTE ]</p><p> <font color="brown"> The book gun propulsion technology (progress in astronautics and aeronautics) discusses propellant additives used to reduce burn temperature. </font></p><p></p><p>[/ QUOTE ]</p><p>And reducing temp reduces pressure - unless <strong> <em>magic</em> </strong> comes into play. </p><p></p><p></p><p> [ QUOTE ]</p><p> <font color="brown"> There are also recent studies of additives for prolonging barrel life in artillery. </font></p><p></p><p>[/ QUOTE ]</p><p></p><p>No question there are things you can do to prolong barrel life - but that has nothing to do with the fact burning powder is a good aprox of PV=nRT. Can you site any literature refuting such? Do you have an explanation on how a lower temp can produce equal pressure? (One would be the formation of new gas molecules - increasing the n - but chemists I've talked to say powders don't differ in this regard.)</p></blockquote><p></p>
[QUOTE="ricka0, post: 76247, member: 3086"] [b]Re: wc872 burn rate[/b] [ QUOTE ] <font color="purple">Not an expert by any means,but your formula is not taking into account the powder burn rates and the area in which they're burned. </font> [/ QUOTE ] Actually it does take into account burn rate. That's what I'm talking about the integral of the P function (the area under the curve of the graph). The area where they are burned would only matter if you had dirac type impulses, which you don't. The pressure is relatively low compared to high explosives. [ QUOTE ] <font color="brown"> Complex high pressure non-equilibrium systems often deviate substantially from ideal gas law behavior.</font> [/ QUOTE ] Powder burning is neither. You'd be right for high explosives. [ QUOTE ] <font color="brown"> The book gun propulsion technology (progress in astronautics and aeronautics) discusses propellant additives used to reduce burn temperature. </font> [/ QUOTE ] And reducing temp reduces pressure - unless [b] [i]magic[/i] [/b] comes into play. [ QUOTE ] <font color="brown"> There are also recent studies of additives for prolonging barrel life in artillery. </font> [/ QUOTE ] No question there are things you can do to prolong barrel life - but that has nothing to do with the fact burning powder is a good aprox of PV=nRT. Can you site any literature refuting such? Do you have an explanation on how a lower temp can produce equal pressure? (One would be the formation of new gas molecules - increasing the n - but chemists I've talked to say powders don't differ in this regard.) [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm Allen Mag test rifle finished.....
Top