Simulation of surge and stall for Rotor 37
Hi, dear friends~~
I'm doing a simulation of surge and stall for rotor 37 using the CFX , but I don't know how to set the boundary conditions,can anyone so kind to give me some advice? Thanks in advance! |
Have you read the best practices guide for turbomachinery? It is part of the CFX documentation.
|
Quote:
Can you give me some advice? Thank you very much. |
Surge and stall are effects with complicated separated flow and you would expect difficult convergence with them. Have a look at the FAQs for hints on getting convergence. Also you are almost certainly not going to get a steady state simulation to converge. It will require a transient approach.
|
2 Attachment(s)
Quote:
Attachment 45223 Attachment 45224 |
Quote:
|
Quote:
|
Quote:
|
Quote:
|
5 Attachment(s)
Quote:
Attachment 45288 BC on inlet Attachment 45289 BC on outlet Attachment 45290 Pout = 105000 [Pa] then was veriable in serial solvering Settings Attachment 45292 Attachment 45291 |
It looks you do not have rotor tip clearance, and then you are losing more trust in the prediction.
What interface models were you using on the two interfaces? You don't have to go with two stationary domains. |
1 Attachment(s)
Quote:
Why I don't must use two stationary domaine. I think that need to have domaine to remove influence outlet condition. Shrout tip only give loss of parametrs. |
I assume you used the same stage interface upstream of rotor. No tip clearance simulation should predict even higher pressure ratio and efficiency than test. But yours did not. Where and how did you get the pressure ratio and efficiency on the curve? Only a single R1 is enough to simulate the rotor only case.
|
1 Attachment(s)
Quote:
I use shot rotor domaine because want to get high results of effenciency, a long rotating gas channel raise length movements of gas, so it is raise gidravlic loss. I get Pr Rt and EFF on boundary of rotor and stator domaines Attachment 45360 |
You should get mass-averaged PR and total absolute temperature at the same location where the test data were obtained. Even in R1 only domain you can set a non-rotating hub area as you want. Again you need to repeat the no-tip-clearance simulation until you get higher performance than test. Clearly your prediction will not be seen in any other CFDs.
|
5 Attachment(s)
Quote:
Attachment 45445 Attachment 45446 thats me setting on the inlet Attachment 45447 setting of domaine Solved with shroud tip (turn on doble precision) Attachment 45448 RMS Attachment 45449 eff politropic and isoentropic (lower that in exp) |
1 Attachment(s)
Quote:
massflow at the outlet |
Inlet and outlet domains in Turbogrid will let you specify a non-rotating hub in CFX. Every residual needs to be less than 1.0e-5. You need to identify what was the hot tip clearance in the test and what position test map was measured at.
|
Quote:
|
Rotor 37 Curve File
Dear Friends
I am working on rotor 37. I need its blade, hub and shroud curve files. Kindly share its file. Please.. |
All times are GMT -4. The time now is 15:42. |