2. Continuous flow in a moving channel
The fundamental laws of physics are identical in reference systems that move linearly in relation to one another. This was Galileo's experimental observation, taken up by Newton to demonstrate his second law. This second law or fundamental principle of dynamics is therefore only valid in Galilean reference frames (or inertial reference frames). A material point P subjected to one or more forces acquires an acceleration proportional to the resultant of these forces, in a Galilean reference frame (6) .
A point in a rotating wheel obviously doesn't move linearly; we're no longer in a Galilean frame of reference and, as a result, Newton's second law, in particular, can no longer be applied. In this case, the law must be supplemented by new terms.
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Continuous flow in a moving channel
Torque and overall forces in a rotor
Bibliography
Websites
Profluid :
French association for pumps, mixers, compressors and valves
Standards
AFNOR standards : https://www.boutique.afnor.org/norme/
- Centrifugal pumps with axial suction PN10 with support under pump casing – Nominal operating point, main dimensions, designation system. - NF EN 733 - août 1995
- Technical specifications for centrifugal pumps – Class II. - NF EN ISO 5199 - mai 2002
- Pompes...
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CNAM (Conservatoire National des Arts et Métiers) Turbomachinery Chair
Appendix: Overview of unsteady effects in a turbomachine
1. Centrifugal pumps
Consider a pump impeller feeding directly into a volute casing. In order to neglect three-dimensional effects, the flow is assumed to be plane, i.e. the thickness of the flow in figure 1...
Bibliography specific to Appendix A
[a] BOULBIN (F.), KERMAREC (J.), PLUVIOSE (M.): Turbine blade forces due to partial admission, Recent advances in compressor and turbine aerothermodynamics, SFM (1992).
[b] PLUVIOSE (M.), PÉRILHON (C.), TOUSSAINT (M.): Machines à fluides, Ellipses (2002).
[c] ZACCARIA (M.), LAKSHMINARAYANA (B.): Unsteady flow field due to nozzle wake interaction with...
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