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Hydrogen + oxygen model rockets

  • Thread starter Cinitiator
  • Start date
  • #1
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Homework Statement


Could one expect to get a good thrust off oxygen and hydrogen fuel in a gaseous form, pumped at ~60 PSI into a 2 liter container? How much (in terms of mass) oxygen and hydrogen would be in the said container at such a pressure, assuming we have a 2/1 hydrogen/oxygen ratio in terms of moles? How did you calculate the amount in question?


Homework Equations


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The Attempt at a Solution


I tried to use the ideal gas law, but it doesn't' seem to apply when there's a 2/1 molar mix of two gases in one container.
 

Answers and Replies

  • #2
6,054
390
Are you familiar with the concept of partial pressure?
 
  • #3
phyzguy
Science Advisor
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I think another word for a pressurized container filled with a mixture of hydrogen and oxygen gas would be a "bomb".
 
  • #4
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I think another word for a pressurized container filled with a mixture of hydrogen and oxygen gas would be a "bomb".
It's a fuel tank. The fuel (oxygen and hydrogen) will be directed into a combustion chamber automatically, due to the high pressure of the fuel tank. No offense, but by your logic, most liquid fuel boosters would also be bombs.
 
  • #5
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Also, assuming that we fill a 2 liter container with hydrogen under a 20 psi pressure, would the hydrogen in the said container weight:

137880*2=n*8.3144621*293.15
n=(137880*2)/(8.3144621*293.15)
n=113.137665678

m=113.137665678*1.007947 = 114.036770707 grams

assuming the temperature is 293.15 degrees Kelvin?
 
  • #6
6,054
390
Convert liters to cubic meters.
 
  • #7
phyzguy
Science Advisor
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It's a fuel tank. The fuel (oxygen and hydrogen) will be directed into a combustion chamber automatically, due to the high pressure of the fuel tank. No offense, but by your logic, most liquid fuel boosters would also be bombs.
Liquid fuel rockets store the fuel and oxidizer separately and only mix them in the combustion chamber. Mixing them in the storage container is a recipe for disaster. Perhaps I'm wrong - I'm not an expert in this area, but it sounds to me like you are on very dangerous ground.
 

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