see running new type of pressure jet - methanol fuel

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thermo jet properties

Postby zono » Sun Mar 15, 2009 10:50 pm

heres the file:

commments come later
Attachments
verd10b.pas.txt
(10.14 KiB) Downloaded 172 times
Last edited by zono on Sun Mar 15, 2009 11:01 pm, edited 1 time in total.
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Re: see running new type of pressure jet - methanol fuel

Postby zono » Sun Mar 15, 2009 10:57 pm

Hi Viv

thanks for these patents ! on the first look it seems similar to my engine. but we need no oxygen, and we have only one-stage-injector for example. I will study this very thoroughly.

I attach the old simulation code (pascal as ascii text file) to this post. unfortunately comments are in german :cry:
but I will translate this, if you or anyone else is interested. explanation will follow next week (I am on travel next days)

... and you see 1995, where this code was written, TurboPascal was aged, but ok. and we were students and had no money for modern CFD progs...
Attachments
verd10b.pas.txt
simulation of injector thermo jet engine
(10.14 KiB) Downloaded 142 times
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Re: see running new type of pressure jet - methanol fuel

Postby tufty » Fri Mar 20, 2009 7:22 pm

Pascal's a pretty good language really. Not the hippest, but easy to code.

This might be useful, if the code is findable : http://www.garret.ru/lang.html
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Re: see running new type of pressure jet - methanol fuel

Postby zono » Fri Mar 20, 2009 8:03 pm

on

http://www.freepascal.org/download.var

I found a nice pascal compiler. Its open source (also found at sourceforge). I am still testing this for compatibility with my old code. But looks good for now...
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Re: see running new type of pressure jet - methanol fuel

Postby zono » Fri Mar 20, 2009 9:22 pm

some more images of this thermo jet
Attachments
P5018627.JPG
P5018626.JPG
P5018625.JPG
P5018624.JPG
P5018623.JPG
P5018622.JPG
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Re: see running new type of pressure jet - methanol fuel

Postby Viv » Fri Mar 20, 2009 9:50 pm

Hi Zono

Couple of questions occur to me in retrospect,
What is your heat exchanger coil made of?
Do you have a metering nozzle between your liquid fuel pump and the heat exchanger coil input? running it sounded like it was surging due to the coil flooding?
Your picture of a running engine looks to be running cool? digital cameras normally look brighter (yellow) than they are due to CCD sensitivity to IR but yours is dark red?

Viv
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Re: see running new type of pressure jet - methanol fuel

Postby zono » Sat Mar 21, 2009 2:59 pm

Hi Viv, here the answers:

Couple of questions occur to me in retrospect,
What is your heat exchanger coil made of?


stainless steel. hard to bend without crack!!!!

Do you have a metering nozzle between your liquid fuel pump and the heat exchanger coil input? running it sounded like it was surging due to the coil flooding?

yes, its a metering nozzle we used 1995, but I havent yet. thats the reason why sounds like surging. pump fills coil - flash vaporizing the fuel - steam pressure too high for pump - steam runs out the injector nozzle - pressure low - start from beginning (pump fills coil....). but with our flow control nozzle it was a smooth rocket whoosh and fizz...

Your picture of a running engine looks to be running cool? digital cameras normally look brighter (yellow) than they are due to CCD sensitivity to IR but yours is dark red?

thats right! in 1995 we had a SLR with diapositive film . I scanned some of the old images. the daylight photos are from 2008 with CCD digicam.
this daylight shown "i-jet type 3" has further insulated shell to be capable for RC-models.

next time I can add some old images from 1995. hope I find some more...
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old images from 90's

Postby zono » Tue Mar 24, 2009 10:09 pm

hi all, see our trials from early 90's
Attachments
p0040.jpg
same same
p0044.jpg
trial tubes with thrust in N
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Re: see running new type of pressure jet - methanol fuel

Postby zono » Sun Apr 05, 2009 9:31 pm

tests with "free pascal compiler" were successful. so next time i will send customized code for thermo jet dimensioning

PS: is "injector thermo ramjet" a accurate phrase for this jet engine?
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Re: see running new type of pressure jet - methanol fuel

Postby zee » Sun May 17, 2009 11:25 pm

Fascinating. Was it pure methanol, or did it have water or nitromethane in it?
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Re: see running new type of pressure jet - methanol fuel

Postby zee » Sun May 17, 2009 11:30 pm

wonder if dimethyl-ether would work?
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Re: see running new type of pressure jet - methanol fuel

Postby zono » Mon May 18, 2009 6:25 pm

pure methanol, thats right. it works fine. it has almost a perfect caloric value (heating value). it is the best compromise between vapor-jet impulse and combustion temperature. dimethyl-ether will work also, but more heat and less vapor-jet impulse. best should be methanol with a bit water added (but not calculated yet)
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Re: see running new type of pressure jet - methanol fuel

Postby kenshin » Mon Jan 09, 2017 12:23 pm

zono wrote:Hi Viv

thanks for these patents ! on the first look it seems similar to my engine. but we need no oxygen, and we have only one-stage-injector for example. I will study this very thoroughly.

I attach the old simulation code (pascal as ascii text file) to this post. unfortunately comments are in german :cry:
but I will translate this, if you or anyone else is interested. explanation will follow next week (I am on travel next days)

... and you see 1995, where this code was written, TurboPascal was aged, but ok. and we were students and had no money for modern CFD progs...


A research paper with similar code based on gas dynamic theory:
SUBSONIC PERFORMANCE POTENTIAL OF RAMJETS AND EJECTOR RAMJETS

The ejector ramjet discussed above use propane for fuel and add excessive rich fuel for increasing ejector primary momentum.
Dimensions are intake area A0/A3=0.1825, exit area A5/A3=0.55
What's your engine size?
Ejector ramjet.png

Ramjet isp.png

Ejector ramjet isp.png

Ejector ramjet isp loss.png
Attachments
SUBSONIC PERFORMANCE POTENTIAL OF RAMJETS AND EJECTOR RAMJETS.part2.rar
(1.8 MiB) Downloaded 16 times
SUBSONIC PERFORMANCE POTENTIAL OF RAMJETS AND EJECTOR RAMJETS.part1.rar
(1.95 MiB) Downloaded 14 times
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Re: old images from 90's

Postby kenshin » Mon Jan 09, 2017 12:28 pm

zono wrote:hi all, see our trials from early 90's

The 25N engine seems to have benefited from small inlet area / good matching with injector.

But why you choose large combustor diameter and length, for gas dynamic purpose, stable combustion, or more surface of heat exchange?

Older engines have problem of combustion occur in diffuser, did the 25N engine prevented that problem?
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