Biomedical Engineering Reference
In-Depth Information
that as the rotating speed of the rotor increases, pressure coefficient increases
and the pressure coefficient values are almost the same for all geometries with
the increase in rotational speed similar to the previous case.
Reproduced with permission. Copyright retained by Inderscience Publishers.
Figure 3. Variation of Pressure Coefficient with Rotational Speed for Two- Stage
Rotor and its Modified Geometry.
From Table 2 It can be concluded that for both half-million rpm and one
million rpm rotating speed of rotor, rotor with three inlets inclined at an angle
of 45-degree is the optimum design compared to the other geometries of the
rotor considered after modifying the rotor geometry and for two million and
five million rpm rotational speed of the rotor, the rotor with twelve blades is
the optimum design of rotor for high-speed spindles compared to the other
geometries of the rotor. Rotor geometries considered for numerical simulations
of high-speed spindles were the two-stage rotor and its modified geometry.
The values of pressure coefficients obtained for different rotational speeds of
these rotors are given in Table 3. The number of control volumes associated
with the numerical simulations of two-stage rotor and its modified geometry
were 522,046 and 521,614, respectively. The maximum number of iterations
considered for convergence control was 200 and the residual target for
