| dc.description.abstract | The following thesis investigates how the computer software STAR-CCM+ and
Xfoil are used to determine the hydrodynamic loads on the two foil profiles EP-
PLER E817 and NASA/LANGLEY LS(1)-0417 (GA(W)-1) with trailing edge
flaps. The foils are analysed with flap lengths of 0.1c, 0.25c and 0.4c, at a Reynolds
number of 20·10^6 , where c is the total foil chord length. STAR-CCM+ uses steady
analysis performed with steady and unsteady solvers depending on when flow sep-
aration occurs for the different cases. The flap is deflected to increase lift, within
the interval 0◦ to 20◦ or 22◦ with interval of 2◦. The main objective is to de-
termine the design parameters for a hydraulic actuator. Hence, the focus is to
determine the hinge moment generated by the hydrofoil. The thesis suggests one
recommended actuator for each of the two foil profiles. From the CFD analysis a
critical hinge moment of 225kNm is found for the EPPLER E817 profile with a
flap length of 0.25c and a span of 4meter, at a Reynolds number of 20·10^6 . For
the NASA/LANGLEY LS(1)-0417 profile with a flap length of 0.1c and a span of
4meter, the critical hinge moment was found to be 5732Nm at a Reynolds number
of 20·10^6. For the EPPLER E18 profile an actuator with piston diameter of 160mm
and rod diameter of 80mm with a design pressure of 250 bar is recommended. For
the NASA/LANGLEY LS(1)-0417 (GA(W)-1) an actuator with a piston diameter
of 80mm and a rod diameter of 40mm with a design pressure of 250 bar is found
to be sufficient. | |
