Compression Ignition in Pneumatics

[jasoncwells]

A long time ago, I recall that there is a concern with compression ignition of oil or other flammables inside a pneumatic system if the rate of pressurization was too high. The place that I used to work had really high air pressures. I'm not a pneumatics guy as my day job. My google-fu gives me lots of links about diesel engines.

The air pressure in the proposed system will be 500 psig. Perhaps ignition is not a concern at lower pressures.

Can you point me to a good reference for this?

 

[btrueblood]

Find the lower ignition temperature (flash point) for your oil/flammable. Find the adiabatic temperature rise for a rapid compression event (hint: if you are filling from a pressurized tank into a lower pressure space, can the total temperature, T0 , increase?). Second hint: if a piston is moved freely by a compressed air pushing it from behind, will the opposite side increase in temperature?

 

[jasoncwells]

Somewhere in the deep dark recesses of boxes from my last move lies a thermo text. I am told by the grey beards that if it should ever see the light of day, that a great scourge will fall upon the land.

Looks like I'll have to do some work.

 

[CWB1]

The two links below are good relevant primers.
https://apps.dtic.mil/sti/tr/pdf/AD0701576.pdf
https://www.icheme.org/media/9189/paper58-hazards-23.pdf