Design and analysis of centrifugal compressor using Ansys Workbench | Bladegen | CFX
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- Опубликовано: 20 авг 2024
- In this tutorial, design and analysis of a centrifugal compressor using ansys workbench will be demonstrated. Preliminary design shall be done in ansys vista CCD, blade modelling shall be done in bladegen and analysis in CFX.
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This video is great. I was clueless before but this helped alot ❤️
Thanks for your comments.
You have been very helpful. Thank you so much.
Thanks for your comments.
great video.. really helpful.. keep creating such content....
Thank you so much for your kind wishes.
thank you very much.this vedio helps me a lot
Glad to hear this. You are welcome.
Hello Sir.
First of all, thank you for such a nice job.
I am doing the Thermodynamic Analysis of the compressor.
In this video, it was made at 40.000 rmp and as a result, I could not see the information about the heat transfer.
These are my questions:
1. If I do what you did step by step, what information can I get about heat transfer in Solution or Result parts?
2. If I want to increase the RPM value, do I have to start over? Or do the results change when I change the value in the last parts?
Kind regards.
Hi, for heat transfer analysis you need to do 'Thermal analysis' preferably using Ansys workbench. That will provide the temperature distribution on impeller wheel. CFD analysis gives only the aerodynamic parameters on impeller flow domain.
I have one prime question regarding this video. On what factors are you editing the blade design in Bladegen? I'm having trouble understanding how to design the blade according to my requirements (my dimensions are in a non-meridional plane, referring to simple design parameters used in our textbooks like beta_1, beta_2 etc)
Hi, I am modifying the basic parameters like blade angle distribution, thickness distribution, etc, to show the capabilities of bladegen in creating compressor model. You can edit the parameters as per your requirement and get the final model.
you must have have design code (for example Compaero), to design the blade from aerodynamic and performance point of view firstly then the out put is geometrical parameters that you use it on BladeGen
@@HAMEDMALI-ru6ox what is that? and why my solver either showing error or oscillation graph?
@@unleashunlimit Compaero is design software for design of compressor either axial or centrifugal. The software calculate all aerodynamic and performance aspects of the compressor, and gives the coordinates of each point on hub and shroud to draw the full blade as well as blade angles of beta and theta
@@HAMEDMALI-ru6ox do you have links to download it?
excellent job...
Hii! I really appreciate on work! It's really helpful 👍😊 in between can I ask you one question that why your efficiency and pressure ratio decreased... At starting you showed base design right? In that efficiency is 0.85 but here you got only 0.74.... Why its so?? 🤔🤔
Hi, thanks for your comment. Initially we did 1D design and calculated PR and efficiency based on 1D equations. But actual 3D analysis will have actual loss components, which will result in lower efficiency and pressure ratio.
Just for clarity is this compressor restricted to being coupled with a turbo or it can be used as a refrigerating compressor as well?
Hey, thanks for the Video.
Maybe its a dumb question, but where do you get the formula for the efficiency from?
Hi, you are welcome. Compressor efficiency is calculated from the ratio of actual work done to ideal work done in compressing the air. Detailed derivation is available in gas turbine theory by Cohen and Rogers.
Excelent video i have a question can you export your impeller design to another software like solidworks
Hi, thanks for your comment. You can export to neutral format like iges file format and import into solidworks.
@@LearnCAE thank you very much 😊. Another question if it's not too much trouble for you. If I have data such as the height of my compressor, angles, etc., where in the program can I put that information?
@@gerom8712 Hi, you can edit the flowpath to modify the blade height, change the beta or theta to modify the angles in Bladegen.
@@LearnCAE Thank you very much, where can I editthe flowpath in which part? Sorry for so many questions,
Great vedio
Can you do a video on how to design a radial inflow turbine for a micro gas turbine please? Using Ansys Rtd
Think you for this video. I wont to ask for this compressor utilisation and if rpm 40000 not very great number.
What is difference between mprime, m and wrap angle?
Hello, i have a small problem while exporting the my blade from BladeGen to Turbogrid.
I have a BGD file which is generated from a Mathlab code, i can open it with BladeGen without any error, i can open it with design modeler as well but if i try to export this file directly from BladeGen to TurboGrid an error appears " Error occurred while writing INF file. ". i have already tried to save a batch file from BladeGen which should include 3 surface files and a .inf file but after i save it the .inf file is not in the directory, BladeGen save just the 3 curves files. my ansys version is 2020 r1. i think the problem derives from BladeGen which is not able (or not have permission) to write the .inf file but i don't know how to fix it.
i hope you can help me. many thanks in advance.
Hi, sometimes such error occurs with bladegen while exporting to turbogrid. This occurs in some versions of Ansys. However, with three curve files you can be able to create mesh in turbogrid. Refer to any turbogrid tutorial in this channel.
May I know if you are using bladegen and turbogrid in standalone mode or in workbench?
Thank you for your reply, I've just downgraded the version to 19 r2 and it is working. However I was using from the workbench
thank you for your excellent tutorial.i have a question on this subject,sir.can i email you and could you help me?thank you very much.
Please email to learncaenow@gmail.com
Hello sir,
Of course.
I emailed you just now.
Thank you very much.
Do you know how to import Meridional blade contour into the bladegen? I've tried using bladegen data import wizard but i failed. Can you tell me how or make a video about it?
Hi, if you want to import the 2D flowpath, then you may choose hub or shroud curves, change it to spline curves and then you can go to segment operations. There you have an option to read segment points. If you could send your email id, I can mail a video clip explaining this procedure.
@@LearnCAE Hello, thanks for a quick answer and sorry for a late reply. I have already managed to do modeling with Blade Modeler but I am stil curious how to do it with BladeGen. My email:chessprofileturk@gmail.com. Btw: Which method do you prefer: modeling with BladeGen or with BladeModeler (inside of geometry tab)
@@elbi9198 Hello, I do not have much experience with blademodeler. So I will not be able to comment about that. BladeGen is quite good for modeling blades. But in my experience, 'CF-Turbo' is much better than BladeGen for centrifugal compressor modeling. It has got good modeling capabilities and multiple export options.
Hello sir, could you still have a model now? Could you tell the model parameters and the source of the model? thank you very much.
I beg you, explain to me how to design the blades in the opposite direction. I can't find the answer to this question anywhere.
I have a doubt. How did you enter 4.10 in the cell just below 4.09 in the table @31:36
Top cell shows mass flow rate at inlet and bottom cell shows mass flow rate outlet. There may be some slight difference due to convergence.
Hello! sir, can you tell us why you kept 110 kp P- static in the out flow boundary condition, Cfx setup?
Thank you
That is a variable number. To begin with, I have given 110kPa. For different back pressures, you will get different mass flow rates till surge point.
How do we get the blade angle distribution spanwise? also, the overall length was not manually given, it seems to have directly taken from the vista CCD results is it right? on a theoretical aspect What is the theta distribution significance on a blade design as shown in colors?
Here we can specify blade angle distribution in spanwise direction by including intermediate spanwise layers and defining beta progression along the chord. Overall length was taken from vista ccd. It can be edited if required in blade modeller. Theta distribution represents the circumferential extent of the blade. It controls the wrap angle of the blade.
@@LearnCAE Is there an option to increase the distance between the main blade and splitter blade
@@nishadiwakar635 I guess you can specify the pitch ratio of splitter blade and modify the splitter blade position in circumferential direction.
@@LearnCAE How to calculate the beta progression along the blade and In vista CCD the vane inlet angle and thickness specified is impeller blade's right? what is rake angle mentioned there?
What is that traling edge points you create at 15:15? Great video!
Hi, that's a good question. Those points are created to fix the straight flowpath/diffuser dimensions just after the impeller trailing edge.
@@LearnCAE hmm got it! ty.
And about the upper trailing edge points, is it needed? or it purpose is for CFX analysis only?
I mean, it creates an empty space at impeller discharge, increasing the impeller inertia. why do not alocate that space to the diffuser?
@@ViniColen It is an empty space created mainly for proper meshing and analysis purpose. You can allocate that to diffuser also. Effectively that space above impeller trailing edge is the diffuser space.
So what is the function of vista ccd? Is it same as we calculating using theoretical method?
Yes, it is the same as you calculate theoratically and it gives input to bladegen for further modelling.
@@LearnCAE wanna ask again, if i add diffuser and volute to the impeller on cfx, is it directly connected or what should i do from cfx pre?
I don't get the 3D view in blade gen. What should I do?
Some bladegen parameter may be missing for geometry creation. Kindly check.
Do you know why my solver keep oscillating and then not converged?
There may be some wake regions near the impeller exit and outlet face may be close to impeller exit.
Hi does anyone know how to create the stator ring using bladegen ?
How do I make the blade angle a whole exact number say 45 degrees instead of 45.4 degrees
Hi, you can specify exact numbers by changing the beta progression curve to spline curve type and manually entering specified values.
@@LearnCAE Thanks for that information
Amazing video sir!
I´m confused about how the 3D twisted blades relate to the blade-to-blade view, where I guess that the betha angle is defined. I´ve read in articles that there is a conformational transformation, do you understand it? Any references about this type of issue?
Thanks!
Hi, I not sure about the transformation method which is used here. But the meridional surface is shown in 2D blade to blade view. It will be more appropriate for axial blades than centrifugal.
Why you set 110kpa outlet P-static that i am very confused
Hi, that depends on the pressure ratio and exit Mach number you expect. You can change the back pressure to get different values, using which you can plot a compressor performance map or characteristics curve. Kindly let me know if this doesn't clarify your doubt.
@@LearnCAE Thank you verrry much，so in this case can i set the 4.5 atm becuase your pressure ratio is 4.5 and your inlet is 1 atm.
@@user-ns6ne1yk7g Hi, 4.5 atm is the total pressure expected at outlet. But you need to specify the static pressure at outlet. That depends on the Mach number at outlet. You can calculate static pressure from total pressure and Mach number using isentropic relations. In this case, total pressure may not be exactly 4.5atm. It may be lower than that.
hello, this topic is interesting for me. to learn it deeper, are you have some references to me? thank you
and instead of using FLUENT, why you choose CFX program?
I need to design a turbine instead. Can you make a video on it ?
Sure, I will make one video on turbine design and upload shortly.
@@LearnCAE Thankyou
@@LearnCAE Radially entering axially leaving turbine
@@LearnCAE Sir, please upload a video on designing a turbine for a turbocharger. It will be a great help for me.
Withing Turbogrid I get the error that I have "negative volumes" and im not sure how to solve it
You may check for negative element regions and try to add a later near that location. It may solve the problem.
Sorry, it is layer and not later
@@LearnCAE Does negative volumes have anything to do with the blade geometry ( I have so many of them) because my blade geometry is not exactly like yours, im not sure how to add additional layers
@@strez011In highly twisted blade models, negative elements may occur. You may check any turbogrid tutorial in youtube to check how to add layers and remove negative elements.
@@LearnCAE Im getting closer solving the negative volumes thanks, can I send you an email I have just a few more questions my email is baffourowusuansah@gmail.com
What's the password of cad file sir...?
what the rar password?
Hi, please contact learncaenow@gmail.com for this purpose.
So what's the pw?
@@don9526 Hi, the video is free, but files are available at a cost to support our team. You may buy the files at learncaenow.com/product/centrifugal-design-analysis/
@@don9526have u got the password?