What is it about?
Nozzles are devices generating liquid or gas jets. They are widely used in fluidics and nowadays also increasingly often in active control of flows past bodies. Being practically always a component of a larger system, design and optimisation of the system needs nozzle properties characterisation by some invariant quantity. Perhaps surprisingly, no suitable invariant for nozzles has been so far known. This article surveys a new approach to the characterisation quantity. Its advantage is demonstrated on several nozzle examples.
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Why is it important?
So far aerodynamic properties of nozzles used to be described by the discharge coefficient. It is not a really good choice because the value of discharge coefficient is not constan. It varies with the fluid flow rate. No better choice, however, has been so far known. The paper comes with a oarameter which is a real invariant of each nozzle.
Perspectives
System designers working with nozzles find as a result of this paper description of ther nozzle properties by a single invariand quantity (the characterisation by discharge coefficient is not constat and varies with varying Reynolds number of nozzle flow)
Václav Tesař
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This page is a summary of: Recent advances in characterisation of subsonic axisymmetric nozzles, EPJ Web of Conferences, January 2018, EDP Sciences,
DOI: 10.1051/epjconf/201817002107.
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