Biomedical Engineering Reference
In-Depth Information
Reproduced with permission. Copyright retained by Inderscience Publishers.
Figure 5. Static pressure distribution on the rotor with 90-degree blade angle at one
million rpm rotational speed of rotor.
Rotor with Three Inlets Inclined at 45 Degrees
Flow topology and pressure variation on the rotor with three inlets,
inclined at an angle of 45 degrees with z-axis is described. The rotational
speed of the rotor was specified as half-million (500,000) rpm.
Flow Pattern
Flow pattern in the geometry can be seen in the Figure 6. Air is entering
into the housing from three inlets with a pressure of 60 psi and exists from
outlet at a pressure of zero. Fluid entering from three inlets impinges on the
rotor blades directly, unlike the previous case (Figure 4), where flow from the
inlets is not impinging directly on the rotor blades, but impinging in between
the rotor blades. Figure 6 clearly shows the impingement of the fluid on the
rotor blades. At the hollow part of the rotor, the fluid is swirled and at the
outlet the velocity increases due to the sudden contraction of the surface area
at the outlet. This forms a vortex flow at the outlet.
Pressure Variation
Figure 7 shows the pressure variation of rotor, along with housing, outlet
and three inlets on a plane parallel to X-Y plane, at a distance of 0.08675
inches from the center, in the z-direction. From the figure it could be seen that
