|dc.description.abstract||In this master thesis different propeller design and analysis methods are presented and compared
in terms of the accuracy and computational efficiency of their theory. These methods
include lifting line, vortex lattice lifting surface and panel methods. A propeller design program
based on lifting line theory was developed by the author. This program has been used together
with the propeller design programs OpenProp and AKPD to make six propeller designs. The
designs are based on two sets of input data, making three designs for each set. Each propeller
design has been analyzed for performance in the analysis software AKPA. Cavitation analyses
have also been performed. An effort has been made to include a CFD (Computational Fluid Dynamics)
analysis as was initially intended. Eventually this is not included due to time limitations
and software issues. The objective of the thesis is to give recommendations regarding what is
the most suitable propeller software.
The following conclusions could be drawn from the performed analysis on the two design
programs utilized in the thesis:
Based on the propellers designs analyzed in this thesis, OpenProp is able to produce the
better designs. Both of the OpenProp propeller designs achieves the highest efficiency as
well as showing the least cavitation.
OpenProp has an advantage in time required to produce a design. It is able to design
and run a performance analysis in a matter of seconds. AKPD requires several minutes to
produce a full design if the number of unsteady calculation iterations are set to 5 or above
(which is recommended by the author for convergence).
AKPD is the only design tool of the two which is able to account for effects from skew and
rake. Skew is often preferred in modern propeller design in order to reduce cavitation,
noise and vibrations.
AKPD is set up for a seamless transition to AKPA. If AKPA is the preferred analysis program,
making the designs in AKPD may end up saving time in the design process.
While both AKPD and OpenProp are restricted to circumferentially averaged inflow, AKPD
can account for inflow in the radial as well as the axial and tangential direction. This might
be of importance for propellers with high shaft angles or high rake.||