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March 28, 2013, 23:32 |
Simulation of surge and stall for Rotor 37
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#1 |
New Member
Maixiaoya
Join Date: Feb 2013
Posts: 10
Rep Power: 13 |
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! |
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April 1, 2013, 19:45 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,862
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Have you read the best practices guide for turbomachinery? It is part of the CFX documentation.
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April 17, 2013, 22:57 |
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#3 | |
New Member
Maixiaoya
Join Date: Feb 2013
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Quote:
Can you give me some advice? Thank you very much. |
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April 18, 2013, 07:16 |
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,862
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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.
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February 16, 2016, 14:06 |
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#5 | |
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Quote:
508967965.png 508967953.png |
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February 16, 2016, 17:10 |
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#6 | |
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Quote:
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February 16, 2016, 17:12 |
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#7 | |
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Quote:
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February 17, 2016, 06:45 |
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#8 |
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February 17, 2016, 22:13 |
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#9 |
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February 18, 2016, 03:18 |
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#10 | |
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Quote:
509101611.jpg BC on inlet 509101933.jpg BC on outlet 509102010.jpg Pout = 105000 [Pa] then was veriable in serial solvering Settings 509102108.png 509102118.png |
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February 18, 2016, 14:54 |
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#11 |
Senior Member
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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. |
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February 19, 2016, 03:07 |
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#12 | |
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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. |
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February 20, 2016, 10:16 |
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#13 |
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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.
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February 22, 2016, 04:42 |
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#14 | |
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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 509452944.jpg |
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February 22, 2016, 13:51 |
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#15 |
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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.
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February 24, 2016, 16:29 |
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#16 | |
Member
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Quote:
509667533.png 509667549.png thats me setting on the inlet 509667692.png setting of domaine Solved with shroud tip (turn on doble precision) 509666165.png RMS 509666153.png eff politropic and isoentropic (lower that in exp) |
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February 24, 2016, 16:31 |
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#17 | |
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Quote:
massflow at the outlet |
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February 25, 2016, 12:49 |
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#18 |
Senior Member
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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.
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May 27, 2016, 02:58 |
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#19 |
Member
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again, I do all what you wrote before but, have not got a good results. Can you send in info about meridional position Rotor wheel Rotor 37?
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September 28, 2017, 02:57 |
Rotor 37 Curve File
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#20 |
New Member
Umer Sohail
Join Date: Dec 2016
Posts: 20
Rep Power: 10 |
Dear Friends
I am working on rotor 37. I need its blade, hub and shroud curve files. Kindly share its file. Please.. |
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