4 Computational Fluid Dynamics
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Fig. 4.43 The limit streamline on the surface of the fairing and the hub
Fig. 4.44 The three-dimensional streamline distribution of the fan flow field
is twisted when it is accelerated by the blade, but it basically moves along the
axis after passing through the deflector, so the flow field quality of the fan
meets the design requirements.
Figures 4.45 and 4.46, respectively, show the curve of volume flow and
total pressure increment with the rotation speed of the fan. It can be seen
that the total pressure increment meets the requirements of wind tunnel
characteristic curve under different wind speeds.