Lady Anne variation.

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milisavljevic
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Re: Lady Anne variation.

Post by milisavljevic » Fri Jul 25, 2008 12:37 am

Graham C. Williams wrote: The Last part of the first Run Video.
Graham! Please! Say it ain't so! :(

By posting the video you killed the joy in my independently computing the running frequency of this motor.

I will not watch this video, nor will I let you or Mike (or some other jackdaw wannabe) spoil things further
by telling me what the measured frequency is, until after I have posted my results. The thrill is gone, baby. :(

So sad,
M.
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Re: Lady Anne variation.

Post by Graham C. Williams » Fri Jul 25, 2008 12:46 am

Dear M.
I too have not used this data for the same reasons.
As for the rest of you I don't yet want to know the operating frequency!!!
M. When you are done I'll send you the Original sound track and we'll see.

Best Regards
Graham.
Dark days nurture new
light. Productions begin.
Now open your eyes.

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Re: Lady Anne variation.

Post by milisavljevic » Fri Jul 25, 2008 12:55 am

Graham C. Williams wrote:I too have not used this data for the same reasons.
Awesome. You're so cool, Graham, what with your stylish "soul patch" and all. :wink:

Good hunting!
M.
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Re: Lady Anne variation.

Post by milisavljevic » Fri Jul 25, 2008 2:26 pm

Graham C. Williams wrote: M. When you are done I'll send you the original sound track and we'll see.
Morning, Graham! Well, I am done but I have not enough time to post the results just now. Soon!
I sent Mike an email earlier this morning where I described the, um...complexity of the acoustics.

The model had no problems whatsoever sussing out FWE-VIII, but how to "tell the story" without
glassing over your eyes?! Let me sleep on it, then I will dump it all out here in iambic pentameter! :wink:

I will leave you with a few, um...teasers (appetizers)

[1] the eCCID for your pulsejet is 56.4 mm (2.22 in.)
[2] the resulting thrust saturation wrt. CCID is ~ 70%
[3] the effective combustor length is 17.4% acoustic*

If you ask him, Mike can tell you why the effective combustor is so short. He's heard it all before. :wink:

Cheers,
M.

* the duct was modeled on physical length 559 mm (22.0 in.), ICAO standard day, sea level, 15 C
.
no safe haven for merchant scum


for ye merchants who do the prop'r t'ing only if
ye be haul'd-up on charges b'fore ye ship-mates
an' threat'nd wit' forfeiture of all ye precious loot
hear this - so-called stand-up guys YE BE NOT

avast!
Cap'n M.

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Re: Lady Anne variation.

Post by Graham C. Williams » Fri Jul 25, 2008 4:16 pm

Dear M.
I have 5 feet on the floor ready to start walking 8)

Graham.
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light. Productions begin.
Now open your eyes.

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Re: Lady Anne variation.

Post by Graham C. Williams » Fri Jul 25, 2008 5:19 pm

Dear Mike.
James has sent me some *.MOV files of this motor running. They are shot at 300 and 600FPS!! The tailpipe shot is awesome; I think we can see individual combustion events!! We also have induction flames and another of the tailpipe emptying a jug of water.
Is there anyway we can get them up on the forum?

Regards
Graham.
Dark days nurture new
light. Productions begin.
Now open your eyes.

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Re: Lady Anne variation.

Post by Viv » Fri Jul 25, 2008 6:09 pm

Graham C. Williams wrote:Dear Mike.
James has sent me some *.MOV files of this motor running. They are shot at 300 and 600FPS!! The tailpipe shot is awesome; I think we can see individual combustion events!! We also have induction flames and another of the tailpipe emptying a jug of water.
Is there anyway we can get them up on the forum?

Regards
Graham.
Hi Graham

Or put them on via mediafire and post a link back here

Viv
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Monsieur le commentaire

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Re: Lady Anne variation.

Post by Mike Everman » Fri Jul 25, 2008 6:27 pm

...or youtube.

OK, I've run the geometry through my acoustic models, too. First, I have to unfold the motor,
fwe8 linearized.JPG
fwe8 linearized.JPG (9.23 KiB) Viewed 2510 times
to analyze the open pipe properties, then consider the closed pipe contribution. I can then determine the (virtual point) combustion locus that gets a match for intake length and throat location. The open pipe combustion locus is bracketed by 22 and 25% of the unfolded length. Graham, I'm curious what your locus estimate is in Nudis; for your reference, converted to closed pipe percentages that would make sense to you, I estimate your zero crossing point as bracketed by 13 and 16% of the closed pipe. Is this close?
I have two models, and both are satisfied with the intake length and throat location within .1%.

Otherwise, as with M.'s model, I can make no sense of the tail. I'm still working on a more accurate model, so this is not conclusive, nor will it be as accurate as M's, nor do I yet consider volumetrics or areas. That being said, when M.'s model says it's good, so does mine, generally, and when his says it's schizophrenic, so does mine, for what that's worth ;-)

What this motor does have in common with my pocket jet is that intake and throat satisfy both of my models, but the pocket jet has no tail features to make sense of, being a straight pipe. Satisfying both of my models is a rare thing across the many motors I have geometry for.

Faaaascinating. ha
Mike
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Re: Lady Anne variation.

Post by James D » Fri Jul 25, 2008 6:58 pm

I've converted this video file to wmv, it has lost a bit of quality in the process.
Attachments

[The extension wmv has been deactivated and can no longer be displayed.]

Image

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Re: Lady Anne variation.

Post by Viv » Fri Jul 25, 2008 7:35 pm

James D wrote:I've converted this video file to wmv, it has lost a bit of quality in the process.
Hi James

Could you try a QT or VCL conversion to keep the quality?

Viv
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Re: Lady Anne variation.

Post by Graham C. Williams » Fri Jul 25, 2008 7:55 pm

Mike Everman wrote:The open pipe combustion locus is bracketed by 22 and 25% of the unfolded length. Graham, I'm curious what your locus estimate is in Nudis; for your reference, converted to closed pipe percentages that would make sense to you, I estimate your zero crossing point as bracketed by 13 and 16% of the closed pipe. Is this close?
Faaaascinating. ha
Dear Mike.
I need to check my notes but these numbers ring a bell for the early zero crossing points. Later in the Cycle the 25% trys to disolve but is locked to about 30+% (from memory) under the influence of a minor build at 50%. Then later still we have another at 60 something percent. This last is not part of the combustion but represents a significant pressure rise behind the Hot/Cold Interface in the last part of the tailpipe.

Many Thanks.
Graham.
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Re: Lady Anne variation.

Post by milisavljevic » Sat Jul 26, 2008 2:59 am

.
Mike Everman wrote: Otherwise, as with M.'s model, I can make no sense of the tail.
Wow...I don't know where Mike's getting this from, as I've said nothing about the tailpipe layout of FWE VIII.
Maybe you're remembering something I said about "camel humps" in a previous conversation?! I've said lots.

For the record: it's not that humps make no sense; it's that there's no point to them, short of adding volume.

I consider FWE camel humps a kind of, um...stylistic affectation? :wink:

Mike Everman wrote: That being said, when M.'s model says it's... schizophrenic, so does mine...
Double wow...I did say that, but, um...Mike, that was meant to stay, um...private? :(

My write-up to follow later this evening or tomorrow morning. Schizophrenia and all!

Cheers!
M.

PS: Mike, I'm soooo glad you didn't mention the motor's multiple frequency disorder! A big relief, what?! :o
no safe haven for merchant scum


for ye merchants who do the prop'r t'ing only if
ye be haul'd-up on charges b'fore ye ship-mates
an' threat'nd wit' forfeiture of all ye precious loot
hear this - so-called stand-up guys YE BE NOT

avast!
Cap'n M.

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I brake for limericks and haiku

Post by milisavljevic » Sat Jul 26, 2008 5:46 am

.
Missed THIS, from earlier in the thread:
Graham C. Williams wrote: Dear M.
I have 5 feet on the floor ready to start walking.
If you were not already married, I know a lady who really wants to meet you! :wink:

And now, these words from our sponsor:

A five-legg-ed man
strode up to me, spoke to me,
most nonchalantly.

I tipped my hat low
and congratulated him;
so impressed was I

I forgot my place
and (oops!) missed the urinal.
He left with a limp.


:o

Cheers!
M.
.
no safe haven for merchant scum


for ye merchants who do the prop'r t'ing only if
ye be haul'd-up on charges b'fore ye ship-mates
an' threat'nd wit' forfeiture of all ye precious loot
hear this - so-called stand-up guys YE BE NOT

avast!
Cap'n M.

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Re: Lady Anne variation.

Post by Mike Everman » Sat Jul 26, 2008 7:44 am

[quote="milisavljevic"]
Double wow...I did say that, but, um...Mike, that was meant to stay, um...private? :(

Apologies, M. I'm also having trouble separating dream from reality these days...
Mike
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Re: Lady Anne variation.

Post by Graham C. Williams » Sat Jul 26, 2008 8:22 am

Ah Ha.The Process Begins!!

Graham.
Dark days nurture new
light. Productions begin.
Now open your eyes.

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