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Old 07-07-2012   #1
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Default Why won't the gas ignite ?
I'll post a video soon - but yesterday I tried to photograph a fireball . I filled a balloon with gas and used a 325 volt discharge across a wire
to burst it .



The balloon was cut open but the gas did not burst into flames ? Then [ shown in the video ] I put gunpowder down , used the hot wire to light the gunpowder - which then burst the balloon ..... but it still never caught fire ? Any suggestions on how I get the gas to burst into flames ?


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Old 07-07-2012   #2
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Default Re: Why won't the gas ignite ?
What kind of gas?
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Old 07-07-2012   #3
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Default Re: Why won't the gas ignite ?
Quote:
Originally Posted by zemlin View Post
What kind of gas?
LPG/propane
I know it needs oxygen as well but you'd think it has enough around it as it gets released ?
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Old 07-07-2012   #4
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Default Re: Why won't the gas ignite ?
unless the ignition source is gone by the time it's mixed with O2.
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Old 07-07-2012   #5
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Default Re: Why won't the gas ignite ?
lpg (auto) ignition temperature is about 900F/480C. How hot is the inside?
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Old 07-07-2012   #6
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Default Re: Why won't the gas ignite ?
Quote:
Originally Posted by zemlin View Post
unless the ignition source is gone by the time it's mixed with O2.
Perhaps a pilot flame above the balloon ?

Quote:
Originally Posted by Rense View Post
lpg (auto) ignition temperature is about 900F/480C. How hot is the inside?
Not too hot inside but the wire that cuts it open is the result of a 325 volt 3300uf capacitor discharging and blowing it to bits - that should be pretty hot ?
Also when the video is uploaded you will see another attempt with gunpowder under the balloon bursting into flames and popping the balloon - with no resulting fireball .
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Old 07-07-2012   #7
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Default Re: Why won't the gas ignite ?
The video .

fireball attempt - YouTube
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Old 07-07-2012   #8
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Default Re: Why won't the gas ignite ?
Too lean or too rich of a mixture at the moment of ignition could be the problem
https://en.wikipedia.org/wiki/Upper_flammable_limit
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Old 07-07-2012   #9
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Default Re: Why won't the gas ignite ?
What you need to do is ignite the gas INSIDE the balloon.
This will burst the balloon as well.
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Old 07-07-2012   #10
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Default Re: Why won't the gas ignite ?
A pilot flame might work, although the effect could be a lot different than igniting from inside the balloon. I think you need to fill the balloon with a mixture.


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