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How to calculate Torque for francis turbine

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Old   March 13, 2007, 07:20
Default How to calculate Torque for francis turbine
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manish
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Dear all i am doing numerical simulation of francis turbine an d want to calculate the efficiency so for that i need to first calculate the total torque how to calculate the torque in CFX my rotation axis is z axis and if i want to select the hole runner domain in calculator about the z axis i am getting error "vertex point mismatch" please help me at waht location i can calculate the torque for turbine. i have 13 balde runner and i am doing my simulation by taking one blade passage.
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Old   March 14, 2007, 13:51
Default Re: How to calculate Torque for francis turbine
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Joe
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Search for "torque" in the help manual. You will get many hits.
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Old   March 14, 2007, 14:00
Default Re: How to calculate Torque for francis turbine
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manish
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hey i got it but i have now another problem i cut the passage between two blades like that i have one side suction surface of the blade and another side pressure (i can say one side half blade and another side half blade) and i don't have one single blade so it is possible for to calculate the torque with my case or i have to modify my geometry in cad software and do meshing and simulation again.
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Old   March 15, 2007, 02:59
Default Re: How to calculate Torque for francis turbine
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Sans
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In the calculator, select the blade part to get the torque, also select the hub and shroud incase you have them included. Can you confirm this is a steady state run with a single passage?

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Old   March 15, 2007, 03:57
Default Re: How to calculate Torque for francis turbine
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manish
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my problem is i don't have part name blade,i have the passage one side half blade surface and another side half (pressure surface and suction side surface)so in calculator i am able to get torque for only one surface either suction or pressure surface
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