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-   -   Multiple Injection points in sprayFoam (https://www.cfd-online.com/Forums/openfoam-pre-processing/90640-multiple-injection-points-sprayfoam.html)

kripalpariyangat July 16, 2011 14:51

Multiple Injection points in sprayFoam
 
I would like to know how multiple injectors can be introduced into sprayFoam. Any help will be greatly appreciated. Thanks in Advance

Kripal

kripalpariyangat August 4, 2011 06:52

coneNozzleInjection Vs coneInjection (multiple Injection)
 
2 Attachment(s)
I am working on propane injection into propane vapor (pressure 138000Pa, Temperature - 324K)
I have tried the sprayFoam with coneNozzleInjector. It works perfecltly fine. The temperature and pressure profile looks decent. But when I switch the injector to coneInjector for having multiple injections ( 7 point injections). The temperature of the propane gas shoots up to more than 1000k. I could not understand what is initiating this phenomena. Attaching the sprayCloudProperties file for both the cases.

arash1 August 12, 2011 16:17

1 Attachment(s)
Hi everyone,

First, thank Kripal very much for sharing the files.
I have been looking for the way to define multiple injectors in sprayFoam.

I tried to define two injectors using positionAxis keyword in sprayCloudProperties, but when running sprayFoam, I got a Fatal Error. What's wrong with it?

Have a good time!

kripalpariyangat August 14, 2011 02:41

coneNozzleInjection vs coneInjection
 
Hi Arash,

You have defined coneNozzleInjection in the sprayCloudProperties. coneNozzleInjection do not support multiple injection. its coneInjection which supports multiple point injections (no diameter need to be defined). you can check the source codes in openfoam200\src\lagrangian\intermediate\InjectionM odels (I hope the path is correct). I tried implementing a multiConeNozzleInjection model. but still struggling with some compilation errors. Once I am done, I will share it with you.

regards

Kripal

conceptone April 17, 2013 16:02

Hi,Kripal, acutually I am using sector domain to simulate the multi-injectors(whole domain is a const. cylinder), but the mass injected is not equal to what I input(much smaller than I input, not equal to the total mass divided by number of sectors either). Do you know the possible reason of this?
Thanks

ris April 18, 2013 07:05

Hello,
In sprayCloudProperties, change the minParticleMass to something like 1e-21
That should solve the problem.

ris

mxylondon August 5, 2013 04:11

Hi, I am struggling to set different velocities for different injection points with coneInjection, is it possible?
I think it should be fine, but, it costed me many days without success...

kenny5393 April 8, 2014 00:20

coneInjection
 
Im currently using coneInjection to simulate a three port injector. How does sprayFoam define the diameter of the outlet? is it from the mass flow rate and Umag?

sraviteja May 7, 2014 09:43

Quote:

Originally Posted by kripalpariyangat (Post 318844)
I am working on propane injection into propane vapor (pressure 138000Pa, Temperature - 324K)
I have tried the sprayFoam with coneNozzleInjector. It works perfecltly fine. The temperature and pressure profile looks decent. But when I switch the injector to coneInjector for having multiple injections ( 7 point injections). The temperature of the propane gas shoots up to more than 1000k. I could not understand what is initiating this phenomena. Attaching the sprayCloudProperties file for both the cases.


How do you input the injection pressure?

ENKIME June 4, 2014 20:27

Hi Raviteja
Sorry for bother you, but I have same issue.
I'm running sprayFoam with C13H28, so I need to change the injection pressure to 80 MPa and in the sprayCloudproperties does not appear any reference for changing the pressure.
I wonder if you can solve this problem, also I'm using sprayFoam instead of dieselFoam.
Thanks a lot
Kind regards

JuanRodriguez February 19, 2015 18:04

Hi.
I think you need to set your flowType to pressureDrivenVelocity and specify spray pressure in Pinj.

alvariten June 29, 2015 13:25

Hi all,

I have several question about the sprayCloudProperties file, more specifically with coneNozzleInjectionCoeffs.

- Is there any file (into openfoam211\src\lagrangian\intermediate for example) where are defined all this Coeffs (like SOI, parcelBasisType, outerDiameter, etc...) and his respective choices? If anyone knows any of his meaning, I would be grateful for a brief description.

- Also I wondered if the "thetaOuter" is the angle of the jet measured from the bisecting line (assuming a symmetric jet). And... is it necessary to define this parameter as an input parameter? Is not there another model that doesn't need to define this parameter as input, for to be analyzed in the post processing?

Thanks
Regards.

Tom123 August 18, 2015 02:10

Hi Alvaro,

I have the same question with you. Do you find any material right now?


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