M500 build log

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ganuganu
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Re: M500 build log

Post by ganuganu » Mon Feb 18, 2013 9:11 pm

WoW day by day the engine is getting perfected and iam very very eager to watch it running.. :D :D

Chook
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Re: M500 build log

Post by Chook » Tue Feb 19, 2013 1:31 pm

You are not alone there ganuganu!!!!
It's a very impressive work of art. :D
Can't wait to see a video of this one running.

Kool
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Re: M500 build log

Post by Kool » Thu Feb 21, 2013 5:23 pm

Soon we could be excepting some more seismological activity in the northern haha.
How many detonations per second are you excepting? (frequency)

Good luck with it!
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metiz
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Re: M500 build log

Post by metiz » Thu Feb 21, 2013 6:51 pm

Still deflagrations, Chook. Around 15 or so
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PyroJoe
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Re: M500 build log

Post by PyroJoe » Thu May 16, 2013 5:38 pm

Any updates?

metiz
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Re: M500 build log

Post by metiz » Thu May 16, 2013 10:28 pm

Looking for spraynozzles, ~3.3L/min. Suggestions?
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PyroJoe
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Re: M500 build log

Post by PyroJoe » Fri May 17, 2013 3:43 pm

What is the pressure your pump can sustain at 3.3 L/min. ?

metiz
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Re: M500 build log

Post by metiz » Fri May 17, 2013 4:41 pm

PyroJoe wrote:What is the pressure your pump can sustain at 3.3 L/min. ?
Getting a proper pump is of later concern, shouldn't be a problem as long as the injectors don't require ridiculous pressures. I think that anything under, say, 2MPa is doable at those flowrates.
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PyroJoe
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Re: M500 build log

Post by PyroJoe » Fri May 17, 2013 9:52 pm

I'm thinking spray bar similar to what Keith Mcconnell did with his spray bar. I have purchased a small drill that can be used with precision. Pen Drills. They have some very small sized drill bits.

Once you have your pump you can test the flow rate in a bucket and slowly add more holes to bring it up to the rate you need.
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ace_fedde
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Re: M500 build log

Post by ace_fedde » Sat May 18, 2013 8:54 pm

So, so, so to busy to do fun stuff, even to think of fun stuff.... :(

Tried to find some materials, found them, then no clue where I left them, found them again, etc....

What I have out of high pressure water cleaners:
2 or 3 ful pumps with lot's off brass nozzles (should cool themselves with the fuel), different nozzle sizes. They pump around 2.5 to 10 kgs/h

If that's (far) to short:
High pressure water pumps with nozzles. 100 to 200 bars. 5 to 15 liters a minute. They should have less problems with fuel then with water, they are piston pumps.

Tomorrow I'm going to Croatia, back in a few weeks.

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metiz
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Re: M500 build log

Post by metiz » Sun May 19, 2013 11:02 am

PyroJoe wrote:I'm thinking spray bar similar to what Keith Mcconnell did with his spray bar. I have purchased a small drill that can be used with precision. Pen Drills. They have some very small sized drill bits.

Once you have your pump you can test the flow rate in a bucket and slowly add more holes to bring it up to the rate you need.
I don't know what a spraybar is, can you clarify?
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PyroJoe
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Re: M500 build log

Post by PyroJoe » Mon May 20, 2013 1:30 pm

It is a simple tube drilled with holes. Attached is the one that Keith posted. Throttle is varied by changing the applied fuel pressure. Smaller holes allow it to maintain spray at lower pressures. The problem with smaller holes is they tend to clog easily. The pattern the holes are drilled can fan the spray across the intake flow to distribute the fuel evenly.

Its a low technology / low cost solution to what could be a difficult / expensive problem.
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metiz
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Re: M500 build log

Post by metiz » Mon May 20, 2013 2:19 pm

And those are placed inside the intake? One problem I can see happening is the the fuel exits the holes in a laminar fashion
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John Hasler
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Re: M500 build log

Post by John Hasler » Mon May 20, 2013 4:27 pm

> One problem I can see happening is the the fuel exits the holes in a laminar fashion

You need to keep the pressure high to avoid that (which in turn means smaller holes).

A method used in ag sprayers to obtain a spray of fine droplets is to arrange for the jet exiting a nozzle to immediately strike a 45 degree barrier. This produces a broad spray of very fine droplets.

PyroJoe
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Re: M500 build log

Post by PyroJoe » Fri May 31, 2013 1:48 pm

"And those are placed inside the intake? One problem I can see happening is the the fuel exits the holes in a laminar fashion"

The spray bar is probably good for fluids of low density that have viscosity properties that allow it to break up the laminar flow immediately after exiting. Alcohols appear to work well in this regard at 0.03" diameter holes.

Heavy oils appear to not break up well, and will be more likely to maintain a laminar flow. If I recall you were going to use fuel oil, that will probably require a nozzle system of some type. It would probably be a good idea to heat the oil to allow it to break up the laminar flow better.

What are your thoughts?

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