Calculating Air Bag Inflation Rate for Exhaust Powered Vehicle Jack

AI Thread Summary
The discussion focuses on designing an exhaust-powered vehicle jack using an air bag and calculating its inflation rate. Key calculations involve determining the mass flow rate and velocity of exhaust gases, as well as the time needed to inflate the air bag. Participants suggest using the ideal gas law (PV = nRT) to find the number of moles (n) and recommend researching the chemical composition of exhaust gases, primarily consisting of nitrogen, carbon dioxide, and water. The challenge of water condensation within the air bag is also highlighted as a potential complication. Accurate calculations are essential for ensuring the air bag can withstand the stresses required to lift the vehicle effectively.
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I am designing an exhaust powered vehicle car jack air bag. I have calculated the mass flow rate and velocity of the exhaust gases leaving the vehicles exhaust pipe. I need to calculate the amount of time it will take to inflate an air bag of a particular size. What equations do I need to be using in order to calcualte the rate of inflation? Also I need to calcuate the stresses the air bag will have to withstand in order to lift the vehicle. I have taken fluid mechanics but I am having trouble figuring out which equations to use.

Thanks for the help...
 
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PV = nRT
 
how would I get (n) for the above equation?
 
n is the number of moles.
Mostly coming out of the exhaust is unburnt N2 (80%) of air, CO2 an H2O
You said you know the mass flow of exhaust, you can probably lookup the chemical composition of exhaust (it's probably in the clean air act etc) otherwise just assume air.
The tricky part is probably water, it will come out as a gas but condense in the bag.
 

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