HYBRID FUELING 101

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SpudFiles Forum Index » Hybrid Cannon Discussion » HYBRID FUELING 101

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HYBRID FUELING 101

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Gunner

Posted: 07/16/2008 8:45 AM Post subject:

Staff Sergeant

Joined: 21 Oct 2007
Posts: 100
155.76 Spud Bux

OK...what is the volume ratio because I have LP gas, can I use 0.96:0.04?

(Edit: No problems anymore Wink

)

lctchamp

Posted: 10/19/2008 17:22 PM Post subject:

Specialist

Joined: 21 Aug 2008
Posts: 43
83.10 Spud Bux

i understand the how much propane to put in its the air thats confusing me. For a 2x mix you would just add 14.7psi of air?

LikimysCrotchus5

Posted: 10/19/2008 17:58 PM Post subject:

Brigadier General

Joined: 04 Sep 2007
Posts: 1064
2535.08 Spud Bux

Yes but you would also add twice as much propane so that your mixture is combustible.

fogus

Posted: 11/11/2008 17:18 PM Post subject:

Private First Class

Joined: 22 Oct 2008
Posts: 31
115.53 Spud Bux

OK, I believe I have a recipe for filling a hybrid combustion tank in my head.

It is:

1. Decide on what --X (compression ratio) you want to end up with.
2. Assuming your chamber is filled with 14.7PSIa of air:
3. Raise the pressure of the chamber to 14.7 + 0.62 = 15.32 PSIa using propane. (I will consider this a nominal 1X mix).
This will read 0.62 PSI on a gauge.
4. Continue to raise the pressure of the chamber using propane, until it reaches 15.32 + 0.62*(X) PSIa, where X is the compression ratio you are using.
This will read 0.62*(X+1) PSI on your gauge.
5. Using air now, raise the pressure to 15.32 + 0.62(X) + (14.7-0.62)*(X) = 15.32 + (X)*(14.7) PSIa. This will read 0.62*(X+1) + (14.7-0.62)*(X)
= 0.62 + 14.7(X) PSI on your gauge.

Did I screw up anywhere?

POLAND_SPUD

Posted: 11/11/2008 18:04 PM Post subject:

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Joined: 13 Oct 2007
Posts: 984
2470.13 Spud Bux

uhmmm yes you did....

1x mix is a 'proper' mix of air and propane at atmospheric pressure
2x mix is a mix of air&propane at 2atm and so on

fogus

Posted: 11/11/2008 18:38 PM Post subject:

Private First Class

Joined: 22 Oct 2008
Posts: 31
115.53 Spud Bux

POLAND_SPUD wrote:

uhmmm yes you did....

1x mix is a 'proper' mix of air and propane at atmospheric pressure
2x mix is a mix of air&propane at 2atm and so on

Yes, that's why I called it a nominal 1X mix. It is 0.62 PSI above a true 1X mix, but it makes it easier to do the calculations. A my starting nominal 1X actually about a 1.042X mix.

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