Effect of inlet leakage flow on the instability in a radial vaneless diffuser
Article dans une revue avec comité de lecture
Auteur
Résumé
The internal flow structures in a vaneless diffuser of a radial pump are experimentally and numerically investigated. Numerical simulations are used for investigating the prominent features of the fluid flow in the vaneless diffuser upon a change of the flow rate and of the impeller-to-diffuser radial gap. Comparisons between experimental and numerical results on the overall pump and diffuser performances are presented and discussed. The influence of inlet diffuser leakages on the development of flow instabilities is specifically addressed, owing to the remarkable impact that a small impeller-to-diffuser radial gap can have on the diffuser flow. Highlights on the rotating instabilities in terms of stall cell number and propagation velocity at design and off-design conditions are the main focus of this study and will be investigated using the numerical and experimental results post-processed by fast Fourier transform and wavelet analysis.
Fichier(s) constituant cette publication
Cette publication figure dans le(s) laboratoire(s) suivant(s)
Documents liés
Visualiser des documents liés par titre, auteur, créateur et sujet.
-
Article dans une revue avec comité de lecturePrevious research works have shown that the inflow boundary conditions have a significant effect on the behavior of diffusers in a centrifugal machine. To better understand the vaneless diffuser instability mechanism and ...
-
Article dans une revue avec comité de lectureBARETTER, Alberto; GODARD, Benjamin; ROUSSETTE, Olivier; ROMANÒ, Francesco; BARRIER, Raphael;
DAZIN, Antoine;
JOSEPH, Pierric (MDPI AG, 2021)
On many occasions, fan or compressor stages have to face azimuthal flow distortion at inlet, which affects their performance and stability. These flow distortions can be caused by external events or by some particular ... -
Communication avec acte
DAZIN, Antoine;
JOSEPH, Pierric;
ROMANÒ, Francesco; GALLAS, Q; MARTY, J; AIGOUY, G; STÔΒEL, M; NIEHUIS, R (IOP Publishing, 2021-01-22)
The objective of the ACONIT project is to design, manufacture and test actuators for flow control for an implantation in an aircraft engine. The actuators will fulfil aeronautics requirement in order to increase the ... -
Communication avec acteBARETTER, Alberto; ROUSSETTE, Olivier; ROMANO, Francesco;
DAZIN, Antoine;
JOSEPH, Pierric (ASME, 2022-06)
In aircraft engines, compressor stages can encounter situations in which the flow is distorted at rotor inlet, for example during particular flight maneuvers, or due to the shape of the inlet of the airframe. The main ... -
Article dans une revue avec comité de lecture
BARETTER, Alberto; GODARD, Benjamin;
JOSEPH, Pierric;
ROUSSETTE, Olivier;
ROMANO, Francesco; BARRIER, Raphael;
DAZIN, Antoine (MDPI AG, 2021-11)
On many occasions, fan or compressor stages have to face azimuthal flow distortion at inlet, which affects their performance and stability. These flow distortions can be caused by external events or by some particular ...