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Showing results 1 to 9 of 9 Search took 0.00 seconds. Search: Posts Made By: duguyoudi

Forum: CFX September 4, 2013, 09:35

Replies: 15 Aboout prop efficiency Views: 2,148 Posted By duguyoudi Hi，ghorrocks Do you have example of... Hi，ghorrocks Do you have example of propellers (better .def)? I think that could be helpful. Thank you very much. Liu

Forum: CFX September 4, 2013, 03:13

Replies: 15 Aboout prop efficiency Views: 2,148 Posted By duguyoudi Thank you. The thrust of the blade fits the... Thank you. The thrust of the blade fits the data, but the power obtained from torque is about 30% higher. If I use mass flow average total temperature to calculate the power, the result is 10...

Forum: CFX September 4, 2013, 02:51

Replies: 15 Aboout prop efficiency Views: 2,148 Posted By duguyoudi Hi，ghorrocks I look up the help document of... Hi，ghorrocks I look up the help document of CFX-Pre. I found that the torque function may raise error when calculating the torque of 3D surface. So how to obtain the value of torque or the power?...

Forum: CFX September 2, 2013, 22:03

Replies: 15 Aboout prop efficiency Views: 2,148 Posted By duguyoudi Yes, I am now changing boundary conditions and... Yes, I am now changing boundary conditions and mesh to find out my mistakes. Best, Liu

Forum: CFX September 2, 2013, 06:38

Replies: 15 Aboout prop efficiency Views: 2,148 Posted By duguyoudi Thank you D.B. The propellers sizes are... Thank you D.B. The propellers sizes are same. I only simulated situations when blade angle at 0.75R is 15 degree. Wind tunnel tests of six propellers were reported in the paper and I only...

Forum: CFX September 1, 2013, 22:08

Replies: 15 Aboout prop efficiency Views: 2,148 Posted By duguyoudi Thank you, ghorrocks But thrust which is... Thank you, ghorrocks But thrust which is ForceZ in the expression is only 1/3 of that from the data. ForceZ was obtained directly from the expression CFX provided. So I'm not sure why the results...

Forum: CFX September 1, 2013, 06:24

Replies: 15 Aboout prop efficiency Views: 2,148 Posted By duguyoudi And there is only Z component velocity at the... And there is only Z component velocity at the Inlet.

Forum: CFX September 1, 2013, 06:18

Replies: 15 Aboout prop efficiency Views: 2,148 Posted By duguyoudi Hi, Thank you for your reply Sorry, I... Hi, Thank you for your reply Sorry, I forget list the left of the equation. ForceZ=force_z()@BladeSurface Power=torque_z()@BladeSurface*25.24*2*3.1415926...

Forum: CFX September 1, 2013, 02:51

Replies: 15 Aboout prop efficiency Views: 2,148 Posted By duguyoudi Aboout prop efficiency Hello, I try to simulate a propeller NACA 6623-A published in NACA 650, 1939. But my results are different from the data. The efficiency is only 0.42 at advance radio=0.65 as well as that from...

Showing results 1 to 9 of 9

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