# Geometry of Stage 37

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 March 14, 2012, 07:32 #21 New Member   Martin Join Date: Feb 2012 Location: Germany Posts: 13 Rep Power: 0 No, I haven't. Unfortunately, I don't have turbogrid.

 March 14, 2012, 10:15 #22 Super Moderator   Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,329 Blog Entries: 6 Rep Power: 45 turbogrid geometry is attached at Post # 11 in this thread.

March 14, 2012, 10:35
#23
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Oleg
Join Date: Nov 2011
Location: Ukraine, Kharkov
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In fact, I have coordinates in more convenient format for you (see attached). I've already extracted them from turbogrids rotor for each section and put into separate .txt files that you can easily import to SolidWorks and then loft a surface.
Attached Files
 rotor37_Turbogrid.zip (59.3 KB, 213 views)

March 14, 2012, 11:49
#24
Member

Raja_Bhai
Join Date: Feb 2012
Location: UK
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Quote:
 Originally Posted by dre I just constructed rotor 37 again using solidWorks only. I assume, that the reason for the differences are the creation of the radii at the leading and trailing edge. I imported all points into SolidWorks. Afterwards I created an arc at the tailing and leading edge with the last and first point of the manufacturing coordinates as maximum and minimum, respectively. Then, I use splines to connect both arcs using the rest of the imported points: Acctually, the length of the rotor is given by the manufacturing coordinates. So there should be no variations.
There is an easier way to do this;
1. Copy the points of each profile in a text file and name it i.e. Profile1.txt
2. use Insert>Curve>Curve Through XYZ Points
3. Browse the profile text file and click OK
4> Use surface loft

 March 14, 2012, 12:19 #25 Super Moderator   Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,329 Blog Entries: 6 Rep Power: 45 This thread is becoming more and more informative, interesting and highly technical. This information, being discussed here, is very rare and mostly unknown except major companies.

 March 14, 2012, 12:35 #26 New Member   Martin Join Date: Feb 2012 Location: Germany Posts: 13 Rep Power: 0 Thanks for your idea, tauqirnawaz. I'll try the turbogrid data and compare it to my rotor created with the manufacturing data. Right now I just have the problem, that I can only use IGES to import the geometry to ICEM CFD (better data formats like *.sat and paraSolid are not working for me). Unfortunately, there are some surface errors and I have problems with the meshing. At the moment, I created a quite coarse structured grid with about 350.000 cells for the rotor. I will start a first run tomorrow. How about the tip clearance (0.1mm) and rotor hub radii (2.5mm)? Do you consider these?

March 14, 2012, 13:11
#27
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Oleg
Join Date: Nov 2011
Location: Ukraine, Kharkov
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Quote:
 Originally Posted by tauqirnawaz There is an easier way to do this; 1. Copy the points of each profile in a text file and name it i.e. Profile1.txt 2. use Insert>Curve>Curve Through XYZ Points 3. Browse the profile text file and click OK 4> Use surface loft
Haven't I said the same in post before and even provided the .txt files?

 March 14, 2012, 13:18 #28 New Member   Martin Join Date: Feb 2012 Location: Germany Posts: 13 Rep Power: 0 Of course, you are right. I misunderstood you. I thought, I needed the CFD-Turbogrid software to assemble the rotor. I didn't think about using the data for SolidWorks :-) My bad!

March 14, 2012, 13:24
#29
Member

Oleg
Join Date: Nov 2011
Location: Ukraine, Kharkov
Posts: 57
Rep Power: 7
Quote:
 Originally Posted by dre Thanks for your idea, tauqirnawaz. I'll try the turbogrid data and compare it to my rotor created with the manufacturing data. Right now I just have the problem, that I can only use IGES to import the geometry to ICEM CFD (better data formats like *.sat and paraSolid are not working for me). Unfortunately, there are some surface errors and I have problems with the meshing. At the moment, I created a quite coarse structured grid with about 350.000 cells for the rotor. I will start a first run tomorrow. How about the tip clearance (0.1mm) and rotor hub radii (2.5mm)? Do you consider these?
In report on Stage 37 there was tip clearance of 0.356mm and I'm not sure about rotor hub radii. And what about your geometry? Will you share it with everyone in general and with me specifically. I want to compare it with my and turbogrid geometries very much.

 March 14, 2012, 13:33 #30 Super Moderator   Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,329 Blog Entries: 6 Rep Power: 45 later it was modified to 0.4 instead of 0.356 mm.

 March 14, 2012, 13:44 #31 New Member   Martin Join Date: Feb 2012 Location: Germany Posts: 13 Rep Power: 0 Sorry, I didn't mean the tip clearance, I ment the tip radius of the blade with 0.1mm. I'll compare my geometry to the turboGrid data tomorrow and post my geometry in this thread. Hopefully, we can figure out the right rotor 37 geometry :-)

 March 15, 2012, 05:22 #32 Member   Oleg Join Date: Nov 2011 Location: Ukraine, Kharkov Posts: 57 Rep Power: 7 I can't wait to see the results

 April 4, 2012, 06:18 #33 Member   Oleg Join Date: Nov 2011 Location: Ukraine, Kharkov Posts: 57 Rep Power: 7 Unfortunately more then 2 weeks has passed and there is no results of geometry comparison from dre. I'm afraid that, at least I, wont ever know the truth But the miracles do happen. Don't they?!

April 5, 2012, 12:38
#34
New Member

Martin
Join Date: Feb 2012
Location: Germany
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Sorry for the late reply, but unfortunately I was involved in another project...

However, I have compared the rotor geometry from the turboGrid tutorial and the measurements from 1978. There are some differences regarding the blade angle (see picture 1). Another Problem of the measurement data is the leading and trailing edge, which doesn't look very smooth (see picture 2).

I think it should be possible to generate a new bladeGen file for TurboGrid with the measurement points. This way, we could still use Turbogrid for mesh generation. Furthermore, TurboGrid interpolates a different number of blade layers, so maybe the trailing and leading edge can be smoothened.

Otherwise, I have no idea what to do with the two geometries (or which geometry to choose). I think a simulation comparison would be good. Maybe the performance map for both geometries compared to the experimental results?

I have also attached the blade geometry from both for icem cfd.

Picture 1:

Picture 2:
Attached Files
 comparison.tin.zip (68.0 KB, 116 views)

 April 6, 2012, 04:36 #35 Member   Oleg Join Date: Nov 2011 Location: Ukraine, Kharkov Posts: 57 Rep Power: 7 dre thank you for your persistence. Unfortunately we didn't get the final results. But i can say that i've built the geometry in a different way. So it would be very interesting to see the results of your geometry calculation comparison with the experiment. Regards, Oleg

 April 6, 2012, 04:38 #36 Member   Oleg Join Date: Nov 2011 Location: Ukraine, Kharkov Posts: 57 Rep Power: 7 dre thank you for your persistence. Unfortunately we didn't come to the final conclusion (what is the right geometry). But i can say that i've built the geometry in a different way. So it would be very interesting to see the results of your geometry calculation comparison with the experiment. Regards, Oleg

 April 6, 2012, 14:35 #37 New Member   Martin Join Date: Feb 2012 Location: Germany Posts: 13 Rep Power: 0 Does anyone have a clue about the second profile curve file in the TurboGrid rotor 37 dictionary? Is it the stator geometry, or maybe something else? I'm at home right now, so I cannot compare it to the measurement data. Regarding my simulation results: I want to simulate this case with OpenFOAM. However, I think I will need another week or so until I can get some results. It would me great to compare these afterwards :-) Regards

May 12, 2013, 21:18
#38
New Member

zhangjian
Join Date: Nov 2012
Posts: 17
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The link is ok, but can't get the right file...

Quote:
 Originally Posted by olegmang Hi guys. After my bloody struggle with Stage 37 I want to share with you results that I've got and, maybe, discuss them (if someone obtained something else) First of all is 3D geometry of Stage 37. http://uploading.com/files/1be6418c/Geometry.zip/ Geometry.zip - 421.4 KB Geometry.zip - 421.4 KB I'm not sure what link should I post so I've put all of them. Hope that this will be useful because when I started this project I haven't found 3D blades geometry. So, geometry of rotor and stator was created in Solid Works 2010 basing on report NASA TP-1337. I took all points from the report, created curve from them and lofted a surface on those curves. You can look for details in files. Second is performance curve comparison. I've compared experimental curve with the calculated one and found that it had lower pressure ratios and MFRs. And, of course, I thought that I've done something wrong. But, after I found an article "CFD SIMULATION OF FOULING ON AXIAL COMPRESSOR STAGES" from ASME Turbo Expo and there they got similar results (i attached screenshot with comparison of experimental performance with the one from the article and my one). As you can see the article authors got almost the same results as I did. What do you think about these results? Maybe someone got better coincidence with experiment? Regards, Oleg

 December 9, 2013, 07:09 3d blade geometry #39 New Member   HUSSIEN SADEQ SULTAN Join Date: Dec 2013 Posts: 2 Rep Power: 0 Hello, we have a research on film cooling in gas turbine blades. Our problem is the generation of blade geometry if you can help us we will be very thanks for you. my email is (sajadhusseen@gamil.com)

 December 4, 2014, 23:44 Reg: Geometry of stage 37 #40 New Member   Pauline Join Date: Jul 2014 Posts: 3 Rep Power: 5 Hello olegmeng I have seen that you shared your Geometry file through discussion forum and you are right, we couldn't find any data's in public.But after 2 years of uploading i can can't access your files. It say's "the file is removed". Can you please share it with me again? My email id is paul.totty89@gmail.com. Thank you in advance

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