Igniter Testing

Igniter Testing

Postby Iain » Sun Sep 06, 2009 6:17 am

Just started testing of our LPRE igniter, picture attached (hopefully) and youtube video here,
http://www.youtube.com/watch?v=NHx7x9CGsNE
Got some mods to make before we test again but expect V1.5 soon!!

Iain
Attachments
igniter test.jpg
igniter test.jpg (64.45 KiB) Viewed 10675 times
Kiwi 2 Space
"NZ's Other Space Program"
www.kiwi2space.co.nz
Iain
 
Posts: 38
Joined: Fri Jul 31, 2009 8:14 pm

Re: Igniter Testing

Postby pauldear » Mon Sep 07, 2009 1:50 pm

Nice one! Can you explain what it's doing (for dumbos like me)?
User avatar
pauldear
 
Posts: 213
Joined: Thu Jul 23, 2009 2:45 pm

Re: Igniter Testing

Postby Iain » Tue Sep 08, 2009 6:13 am

The concept is pretty much a tiny rocket motor to light the larger one!

I used GOX and Propane ignited by the sparkplug, I had a few issues though which as you can see in the video looks like more a series of little explosions rather than sustained igniton.
My fuel/ox oriffice sizing was too big and was blowing out the fire, so to speak,so would only ignite when the sparkplug fired, I think the impingment might have been abit off as well, and my sparkplug was not pulsing enough, I had it hooked up to an electric fence unit, was abit slow. So next test, smaller oriffices, faster pulse and see what happens!
If not I got another design which I'll machine up over the weekend which should work for sure anyhow!!

Should be exactly like this (Masten) next time I try!
http://www.youtube.com/watch?v=AzFPvko1 ... annel_page

Stay posted!!


Iain
Kiwi 2 Space
"NZ's Other Space Program"
www.kiwi2space.co.nz
Iain
 
Posts: 38
Joined: Fri Jul 31, 2009 8:14 pm

Re: Igniter Testing

Postby pauldear » Tue Sep 08, 2009 8:58 pm

aha - now it all makes sense! Thanks. And keep up the good work on the photos too.

Best,
Paul
User avatar
pauldear
 
Posts: 213
Joined: Thu Jul 23, 2009 2:45 pm

Re: Igniter Testing

Postby Iain » Sat Sep 12, 2009 10:26 am

Just tested again tonight, 100% successfull, although a little on the ox rich side.

I'm happy, picture below, video posted soon....


Iain
Attachments
igniterv1.5.jpg
igniterv1.5.jpg (45.25 KiB) Viewed 10640 times
Kiwi 2 Space
"NZ's Other Space Program"
www.kiwi2space.co.nz
Iain
 
Posts: 38
Joined: Fri Jul 31, 2009 8:14 pm

Re: Igniter Testing

Postby Iain » Sun Sep 13, 2009 9:25 am

Kiwi 2 Space
"NZ's Other Space Program"
www.kiwi2space.co.nz
Iain
 
Posts: 38
Joined: Fri Jul 31, 2009 8:14 pm

Re: Igniter Testing

Postby pauldear » Sun Sep 13, 2009 6:39 pm

Oooh - if there's one thing I like more than flames, it's engineering that works. It looks good.

What's the nozzle made of, and what temperatures will it take? How long will it need to fire for?
User avatar
pauldear
 
Posts: 213
Joined: Thu Jul 23, 2009 2:45 pm

Re: Igniter Testing

Postby Iain » Wed Sep 16, 2009 11:26 am

Thanks!

The entire thing is made from a solid bit of Stainless rod that I machined out, its only designed to fire for about 2sec, to keep it below the melting point of SS as its not cooled and just long enough to ignite the main propellants and then shut off.
It can take a fair bit of heat as you see in the video, SS melts at about 1500 Deg C so its getting fairly well up there for acouple of seconds but not long enough to do much if any damage........hopefully!


Iain
Kiwi 2 Space
"NZ's Other Space Program"
www.kiwi2space.co.nz
Iain
 
Posts: 38
Joined: Fri Jul 31, 2009 8:14 pm

Re: Igniter Testing

Postby Peter (Nebula) » Mon Sep 28, 2009 12:06 pm

Hi Iain

Sorry, I meant to post earlier but I got sidetracked. Nice videos :)

One of the things that gets demonstrated very nicely here is just one of the problems that has to be overcome when miniaturising engines, ie. thermal management. I know this is an igniter rather than a thruster, but it does show up what happens when the phsysics and temperatures stay the same but the radiative surface area decreases.

The injectors you're using look like they're from a Nox system - have you cannibalised a car? ;) Looking forward to comparing engines!

Best

Peter
User avatar
Peter (Nebula)
 
Posts: 21
Joined: Mon Jul 27, 2009 12:30 pm
Location: United Kingdom

Re: Igniter Testing

Postby Monroe » Tue Sep 29, 2009 1:40 pm

Holy Cow! Way to go Iain! Hey, thay make a 2-stroke spark plug called a surface gap that you may like? An ingniter circut from a home heating unit (furnace) may provide a cheap soultion for a higher power long duration start? If your interested in some ideas? Good Work! Go Kiwi!

Monroe
User avatar
Monroe
 
Posts: 204
Joined: Tue Sep 29, 2009 10:29 am

Next

Return to Kiwi 2 Space

Who is online

Users browsing this forum: No registered users and 0 guests

cron