primers and ignition affect sd and es

[dcali]

You should add a temp sensor also. Problem is that you need a very fast response pressure and temp sensors or maybe cheaper sensors that capture the max values.

You really don't need a temp sensor because it's all over with in microseconds. There just isn't enough time for any energy to leave the primer ejecta. And yes, the pressure transducers aren't cheap - about $500-1,000 a pop, not including the electronics.

 

[dcali]

I don't remember the sample size if mentioned at all.

That's because it's not a real paper. Honestly, I don't know why a couple of PhD's would go through all of that effort to produce nothing, when you could put the same amount of effort into doing it right. But it's a common theme with the "papers" of theirs I see around the web. They read like student projects.

 

[243Mendoza]

You really don't need a temp sensor because it's all over with in microseconds. There just isn't enough time for any energy to leave the primer ejecta. And yes, the pressure transducers aren't cheap - about $500-1,000 a pop, not including the electronics.

You do need temp sensor since it's the hot gases of the primer that ignites the powder. I don't think the primer shock wave is strong enough for ignition (could be wrong...shock wave pressure of 500psi will result in a temp of 2900degF).

 

[Bart B.]

Bob Jensen fitted a BB gun barrel to a 17 Rem chamber then shot BBs through a chronograph. Primers producing the lowest velocity had best accuracy in his 308 Win NRA match rifles.

He also fitted long flash tubes in 308 Win case heads to ignite powder near the case neck first. A tiny bit better in accuracy and depriming fired cases was more a nuisance than it was worth.

 

[dcali]

You do need temp sensor since it's the hot gases of the primer that ignites the powder. I don't think the primer shock wave is strong enough for ignition (could be wrong...shock wave pressure of 500psi will result in a temp of 2900degF).

You need the temperature, but with the right experiment setup, you can calculate it.