Feature 3
Hydrocomp adapts propeller design
Hydrocomp’s two-year R&D effort to develop a Propeller Design and
Analysis (PDA) module, that it says will offer a cost-effective alternative
to complex codes for wake adapted propeller design and performance
prediction, is in its final stages.
T
he development objectives specified
by Hydrocomp for the PDA module
were reliability, usability, behaviour,
and cost-effectiveness with specific technical
goals including well-behaved predictions with
no unusual results, and that special knowledge
of propeller modelling is unnecessary.
A technical feature of the software is
that the model will utilise a “vortex lattice
lifting-line” calculation engine with special
proprietary enhancements. Users will be able
to select from a list of foil types (such as NACA
66 mod, segmental, and bi-circular) to more
accurately predict performance, especially
in the off-design analysis of KT-KQ curves.
Propeller configurations include both open
and ducted propellers, with work continuing
on counter-rotating and tandem propellers.
The PDA module is hosted by HydroComp’s Open propeller performance (DTRC 4119).
NavCad resistant and propulsion software.
Data exchange is available to the PropCad
propeller geometric modelling software, and
will be extended to third-party CAD and
analysis codes.
Ducted propeller performance is defined
by selection of a nozzle type (eg, 19A, 37, 33),
and representative performance coefficients
are employed for prediction of nozzle thrust
contribution, inflow velocity, and tip-gap.
Added extras
Adding to the 2009 versions of NavCad
and PropCad HydroComp has added
extra features to both.
NavCad now features a new reporter
viewer that will provide enhanced
reporting options, including export to
PDF, CSV and RTF. Along with Propeller Ducted propeller performance (Kaplan 4.55 in 19A nozzle).
CAD shape to generate and export
representative propeller CAD shape in
Initial Graphics Exchange Specification that will include Froude friction line, with conic flow geometry, which will allow
(IGES) format at the proper diameter and additional cavitation parameters and the user to design propellers to a conic flow
number of blades. Measures of propulsion nozzle performance coefficients, new orientation as well as circular flow. Feature
merit will have propulsion criteria that file and print functions, and enhanced updates include China Classification
have been added for industry-standard support for heavy-loaded propellers. Society (CCS) class thickness report, new
measures of merit, including “transport PropCad’s latest features include a new file and print functions and modified 2D
effectiveness”. Calculation updates report viewer the same as NavCad, along drawing attributes. NA
The Naval Architect January 2010 57
NA Jan 10 -
p57.indd 57 12/01/2010 10:05:26
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