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-   -   wrong efficiency-axial compressor rotor 37 (https://www.cfd-online.com/Forums/numeca/109961-wrong-efficiency-axial-compressor-rotor-37-a.html)

sajad December 1, 2012 10:39

wrong efficiency-axial compressor rotor 37
 
Hello
I'm doing Fine turbo v8c tutorial number1. it's about axial compressor rotor 37.
I'm doing exactly like it says
in the tutorial the polytropic efficiency for this case is 88.9% but when i solve it i get value 85.225%!
what is the problem?
please help me

yujiabeizi July 19, 2014 07:13

Quote:

Originally Posted by sajad (Post 395160)
Hello
I'm doing Fine turbo v8c tutorial number1. it's about axial compressor rotor 37.
I'm doing exactly like it says
in the tutorial the polytropic efficiency for this case is 88.9% but when i solve it i get value 85.225%!
what is the problem?
please help me

Many factors can affect your final solution. For example, your mesh ,your computer, even your weather.

swm November 6, 2016 23:54

Quote:

Originally Posted by sajad (Post 395160)
Hello
I'm doing Fine turbo v8c tutorial number1. it's about axial compressor rotor 37.
I'm doing exactly like it says
in the tutorial the polytropic efficiency for this case is 88.9% but when i solve it i get value 85.225%!
what is the problem?
please help me

I also encounter the same problem!
How to solve it, could you please give me your suggestion?

Hamidzoka November 19, 2016 05:32

Hi;
Regarding this problem some points should be considered:
- Air properties should be carefully checked.
- Position of inlet and outlet boundaries as well as hub and shroud geometries should be checked.
- Mesh distributions, turbulence model used, blade RPM and direction of rotation should be checked.
- Spanwise distributions of boundary conditions can also have an impact on the efficiency. So, this needs to be checked.
- Blade tip clearance should be checked.

regards


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