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Segment |
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Segment |
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Ü Impeller | CFD Setup | Miscellaneous | Segment
The segment is the flow passage around a single blade and represents the smallest rotation-symmetric part of the impeller.
For the design, one of the following segment types can be chosen:
| 1. | "Around single blade, by rotated mean line" |
The blade mean surface is rotated to both sides to the middle of the flow channel.
| 2. | "Around single blade, middle of PS-SS" |
The middle of blade pressure and suction side of two neighboring main blades forms the segment boundary. This type should be used for thick asymmetric blades. It ensures that the blades do not cut the periodic surfaces of the segment.
| 3. | "Between neighboring blades (ML to ML)" |
The mean surfaces of two neighboring main blades form the segment boundary. This type is currently not supported by Model finishing.
"Around single blade, by rotated mean line"
With "Smooth inlet" a smooth transition from the impeller inlet to the blade area can be designed. This surface is created by a virtual extension of the Blade mean line from the blade leading edge (which is the trailing edge in case of turbines) to the Inlet (Outlet for turbines).
There are three types of β distribution from the leading edge of the blade (βB1) to the Inlet (βinlet):
| • | linear |
| • | quadratic |
| • | root |
The values of βB1 have been defined in the Blade properties. At the Inlet the distribution of the angle βinlet is linear from hub to shroud.
without "Smooth inlet" |
with "Smooth inlet" |
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3D Model
The segment can consist of up to 3 solids:
| • | Segment.Real Geometry: Segment of the flow passage bounded by real geometries (defined by Meridional contour) |
| • | Segment.Extension: Segment of the virtual geometry Extension (optional) |
| • | Segment.RSI Connection: Segment of the virtual geometry RSI Connection (optional) |
Problem |
Possible solutions |
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3D-Error: Could not create solid for ... RSI Connection |
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Unsupported RSI Connection geometry, e.g. only on one side (hub or shroud) |
Uncheck RSI Connection or change its geometry |
General solid creation problem |
See 3D Model |
Page url: http://www.cfturbo.com/fileadmin/content/manual/en/index.html?cfd_segment.html
