(Raheal and Engeda, 2005; Senoo, 1948; Song et al., 2003).
农村孩子受教育状况调查方案The previous theories rely on assumptions not based on
detailed measurements or rigorous computational fluid
dynamics (CFD) calculations. The main characteristic of
such pumps is the ability to generate high-discharge pressures
at low flowrates. Although the pump has other advantages the
main limitation is its inherent lack of hydraulic efficiency,
typically 35-50 per cent. The aim of the project was to use
CFD to optimise the blade profiles to increase the efficiency
of the pump and CFD is a robust methods to obtain data.
Notwithstanding CFD being recognised as a good design
tool in the initial design stage, the computational results must
be validated with experimental data. It is therefore critical to
have access to manufacturing methods that can produce
dimensionally accurate, small and complex impellers that are
robust enough for testing. Prototypes this complex would
normally be machined using computer numerical control
(CNC) machining techniques.
Having produced the standard radial impeller using
conventional milling techniques, Figure 1, to modify the
blade profiles presents a considerable challenge even for the
most skilled operators. The complexity of the modified blade
profiles, shown in Figure 2, would normally necessitate the
use of expensive CNC machines with five-axis capability. This
paper investigates an accurate alternative manufacturing
technique to create suitable impeller prototypes rapidly and
cost effectively for use in experiments during the CFD
evaluation process. The challenge of this project was not only
to develop a CFD model to represent the complex fluid本文来自辣&文*论~文'网，
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motion within the pump but also a robust manufacturing
process to produce the complex optimised blade designs
needed for validation testing.
In this work the results of the CFD modelling are compared
to experimental data carried out by the authors. When
correctly applied CFD, allows the user to study the flow
patterns in a regenerative pump and verify this with empirical
test data. The key technologies of rapid manufacturing (RM)
are rapid prototyping (RP) and rapid tooling (RT). RP is a
technology for quick fabrication of physical models or
functional prototypes directly from computer-aided design
(CAD) data. RT involves the production of moulds and
tooling inserts using RP.
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