Experimental and numerical investigations on the shape and roughness of cylindrical critical flow venturi nozzles (CFVN)
| Autor: | Guillaume Lehnasch, Eric Foucault, Marc Antoine Lambert, Jean-Christophe Valière, Rémy Maury |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Work (thermodynamics)
Materials science 020208 electrical & electronic engineering Nozzle Flow (psychology) Reynolds number 02 engineering and technology Surface finish Mechanics 01 natural sciences Discharge coefficient 010309 optics symbols.namesake Venturi effect 0103 physical sciences 0202 electrical engineering electronic engineering information engineering symbols Choked flow |
| Zdroj: | 19th International Congress of Metrology (CIM2019). |
| DOI: | 10.1051/metrology/201917003 |
| Popis: | This paper describes a part of a research project aimed at reducing the uncertainty of the determination of the CFVN discharge coefficient. In the current state of the work, there are two parallel studies: an experimental and a numerical. Experiments have been carried out to determine the impact of roughness on the CD and to demonstrate the need for dimension parameters, such as diameter and roughness coefficient characterisation. Numerical simulations are used in the same CFVN geometry with a smooth surface to determine the main parameters which can influence the numerical prediction of the discharge coefficient and the flow behaviour. The results show that an increase of roughness may lead to a significant decrease of the discharge coefficient, particularly in the high Reynolds number range. |
| Databáze: | OpenAIRE |
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