# Torque calculation of film cooled blades

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 March 6, 2017, 21:18 Torque calculation of film cooled blades #1 New Member   Join Date: Mar 2017 Posts: 2 Rep Power: 0 I am trying to calculate the axial torque of a film cooled blade. The exit of the film cooling holes on the blade has a interface surface, so the entire blade surface, as I model the airfoil, cooled be selected. However, the calculated value of the torque on the blade using the function "torque_z()@Blade" was lower then expected. So I tried to find out how CFX calculates torque. In case of the wall region, the torque can be calculated by the pressure and shear forces. (areaInt_y(Pressure * X)@Blade - areaInt_x(Pressure * Y)@Blade) + (areaInt(Wall Shear Y * X)@Blade - areaInt(Wall Shear X * Y)@Blade) In case of the film cooling hole exit, which is an imaginary wall in the fluid passage, could be a sum of pressure force and mass flow*velocity. But, this also shows difference in the values. (areaInt_y(Pressure * X)@BLADE - areaInt_x(Pressure * Y)@BLADE) + (-massFlowInt(Velocity in Stn Frame v * X)@BLADE + massFlowInt(Velocity in Stn Frame u * Y)@BLADE) So, I want to know how to calculate the film cooled blades torque right, and how the torque is calculated at planes in a fluid region.

 Tags film cooling, torque, turbine

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