Geology Reference
In-Depth Information
Inner drill collar surface
Hub surface
Converging
Diverging
Outward
Inward
Figure 7.10.1. Annular passage flow examples
(refer to the “inlet cones” tested for signal influence).
Figure 7.10.2. Example for guided flow device.
7.3.4
Radial variations.
Now we address the modeling of the rotor and stator rows themselves. To
properly motivate the problem, we turn to classical aerodynamic modeling
methods for turbine and compressor blade rows, and consider the “unwrapped”
periodic blade row shown in Figure 7.11 used in aerospace engineering. We
have remarked that a naive geometrical unwrapping of the siren lobes in (say)
Figure 7.3 is incorrect because important centrifugal flow changes in the radial
direction are ignored. Computed results did not agree with experimental
observations. But Equation 7.3.10, which is averaged in the “r” direction, shows
how radial effects can be incorporated.
 
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