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Volute design

volute design turbo turbocharger spiral section cross section caeses modeling turbomachinery

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#1 Mr. Abu Salih

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Posted 14 August 2018 - 09:30 AM

How to determine a spiral volute casing (turbocharger, pump) cross sectional decrease in value? I am trying to design a volute casing. Problem is, I don't know how much its cross sectional area decreases over time. For instance starting cross sectional area (0 degrees) is 100 cm^2, what will it be when it reaches 45, 90 degrees and so on? Is there any way to calculate it? I am sure that knowing starting and finishing cross sectional areas size (btw I know them) and just connecting them isn't a correct way.

 


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#2 Jörg

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Posted 14 August 2018 - 10:15 AM

Hi Abu,

 

The CAESES volute models are typically controlled by a set of functions, in particular, an area or A/R distribution. You can use the meta surface technique for it. meta_surface.png There are also a few tutorials that show you how to create meta surfaces, see the documentation browser. Do you have a simple cross section definition, or a rather complex one?

 

Joerg

 


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#3 Mr. Abu Salih

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Posted 16 August 2018 - 08:11 AM

Good day,

 

thanks for a reply. I am going to take a look at these tutorials. In the meantime, I am adding a similar instance of my cross section. 

 

Abu 

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  • cross section.png

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#4 Mr. Abu Salih

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Posted 28 August 2018 - 01:48 PM

Are there any tutorials about cross section creation? I've seen a video about volute creation, but in that example a cross section is a simple circle, so it's very easy to define its area. Not the case with more complicated shapes like the one I've added tho. 


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#5 Jörg

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Posted 29 August 2018 - 06:33 AM

Hi,

 

Sure, we can send you something. I'll ask my colleagues for an example.


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#6 Mr. Abu Salih

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Posted 05 September 2018 - 12:31 PM

Attached File  test.fdbc   125KB   102 downloadsSo far I've made start and end cross sections. I know that they are not robust (parameters are not variable), but it would still be good enough. How can I make a sweep with custom area distribution with Meta surface from this point? thanks.


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#7 Jörg

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Posted 05 September 2018 - 01:11 PM

Hi there,

 

Please check the tutorial that we ship with CAESES: meta_surface_intro.png

 

I am curious to know whether you succeed with the tutorial. Otherwise we need to improve it ;-)

 

It is just a 2D circle, but it explains how the meta surface technique works. Real world projects are much more complicated. But once you understand this technique, it's easy to model anything with it.


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#8 Jörg

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Posted 05 September 2018 - 01:24 PM

I also add a simple volute example (attachment) where the corner radius of the 2D section is varied in circumferential direction: corner_radius_function.png

 

You can do the same thing with any 2D parameter of the section, including the area or an A/R ratio. Full sweep control in circumferential direction.

 

There is also a factor included, to scale down the function graph (sort of normalization), makes it easier to look at it. In the curve engine, this factor is used again to scale it up to the real values.

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#9 Mr. Abu Salih

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Posted 06 September 2018 - 06:48 AM

Thanks! I will take a closer look at your suggested tutorials. Hopefully I will figure it out :)


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#10 Jörg

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Posted 18 September 2018 - 12:21 PM

Any feedback is welcome!  :)


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#11 Mr. Abu Salih

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Posted 03 October 2018 - 10:07 AM

Sorry for late reply, I was busy with other things during this period of time. I made some progress already tho. I will post my model in a few days 


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#12 Jörg

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Posted 04 October 2018 - 06:36 AM

Sure. Take your time. Looking forward to your experience.


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#13 Mr. Abu Salih

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Posted 08 October 2018 - 09:22 AM

I am uploading my finished model. Personally, I am pretty happy about the result. Anyway, perhaps you can give me some suggestions how to improve, optimize my design  :)
Next step for me would be to create a twin scroll volute model. Thank you for your help!

 

 

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#14 Jörg

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Posted 08 October 2018 - 09:39 AM

Nice work.  :) Good start!

 

Any plans to model the tongue (cut-off) part as well?


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#15 Mr. Abu Salih

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Posted 09 October 2018 - 09:08 AM

Yes, I will be posting my modeling updates in the future :)


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#16 Mr. Abu Salih

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Posted 10 October 2018 - 08:02 AM

I have one more question. Today I noticed that volute surface actually is not exactly smooth. Perhaps you can suggest why is this happening? Thanks.

 

Btw I've already made one adjustment, area is now controlled by a FSpline. 

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#17 Jörg

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Posted 15 October 2018 - 09:51 AM

Hi,

 

I tried a few more cross-sections (e.g. 35) and also increased the rendering resolution, and to me it looks quite ok: volute_visualization_skinning.png

 

Joerg


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Also tagged with one or more of these keywords: volute, design, turbo, turbocharger, spiral, section, cross section, caeses, modeling, turbomachinery