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Help understanding manometric metering

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Help understanding manometric metering

Unread postAuthor: 8tonsemi » Mon May 07, 2012 5:23 pm

Can someone explain to me what manometric metering is. Or link me to a post about manometric metering :lol:
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Unread postAuthor: DYI » Mon May 07, 2012 6:33 pm

Manometric metering is the concept of determining the amounts of gases injected into the chamber by monitoring the chamber pressure and applying the equation of state to find density from the known pressure and temperature.

This can be contrasted with volumetric metering like a syringe (or its equivalent for liquefied gases), or a combination of the two, which uses a "meter pipe" to determine the amount of gas, by the method in the above paragraph. The latter is largely obsolete for everything but atmospheric pressure combustion launchers.

It is worth noting that, due to the approximate nature of equations of state, accurate manometric metering becomes an increasingly difficult endeavour as the fill pressure increases.
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Unread postAuthor: MrCrowley » Mon May 07, 2012 10:08 pm

http://www.spudfiles.com/forums/viewtop ... tml#349890

LOCKED! Search the forums or reply in your old thread.

Don't do this again.
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