CFD Analysis of APC 10 x 7 ePropeller
This project performs a computational analysis of flor over an APC 10x7 ePropeller commonly used in aeromodels powered with brushless motor.
The propeller geometry was created on Solidworks. First the cross sectional aerofoil curves of one blade were generated through a MATLAB code and were connected with loft feature from root to tip. A copy of the blade was then rotated by 180 degrees to complete the geometry of the propeller.
For analysis, a cylinder was generated housing the propeller inside in, which was used as a rotating Arbitrary Mesh Interface (AMI).
Figure 1: Propeller Curves Created on Solidworks
Figure 2: Propeller CAD Model
For generating mesh, snappyHexMesh was used. A box of dimension 120mm x 60mm x 60mm was created which acted as the farfield. The propeller was placed 30 mm aft from the inlet face of the box. Prior to meshing the surfaces were grouped into topological entity sets namely Farfield, Rotating Domain and Propeller. This allowed to set different refinement levels for small and large surfaces easily.
Five Layers of mesh were generated over the propeller growing further to the farfield surface.
For the computational analysis, Transient Incompressible fluid flow type was selected with K-Omega-SST Turbulence Model with PIMPLE solver. Time step of 2 sec were solved with time step length of 0.02 Sec. The analysis was carried out on 32 cores, taking about 58 hours on the SimScale Platform. The picture below shows the convergence history.
The post-processing was carried locally on ParaView. The pictures below shows the velocity map on the propeller surface, Pressure map on the upper and lower surface of the propeller and streamlines on the aft section of the propeller.
Figure 5: Velocity map on the propeller.
Figure 6: Pressure map on the upper and lower surface of the propeller.
Figure 7: Velocity plot on the mid plane of the propeller.
Figure 8: Velocity plot on the mid plane of the propeller.