1. Analysis of Flow Instabilities on a Three-Bladed Axial Inducer in Fixed and Rotating Frames
- Author
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Giovanni Pace, Dario Valentini, Ruzbeh Hadavandi, Angelo Pasini, Luca d'Agostino, Legrand, Mathias, Sitael S.p.a., and University of Pisa - Università di Pisa
- Subjects
animal structures ,Materials science ,Suction ,02 engineering and technology ,01 natural sciences ,010305 fluids & plasmas ,law.invention ,Physics::Fluid Dynamics ,Rocket Propulsion ,stomatognathic system ,0203 mechanical engineering ,Flow Instabilities ,law ,0103 physical sciences ,Aerospace Propulsion, Rocket Propulsion, Rocket Engines, Rocket Engine Turbomachinery, Inducers, Turbopumps, Cavitation, Caveating Flows, Flow Instabilities, Cavitation-induced Flow Instabilities ,Rocket Engines ,Turbopumps ,Inducer ,Inducers ,Spectroscopy ,Cavitation-induced Flow instabilities ,Rocket Engine Turbomachinery ,Cavitation ,Mechanical Engineering ,Rocket Propellant Feed Turbopumps ,Mechanics ,Pressure sensor ,[SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the structures [physics.class-ph] ,020303 mechanical engineering & transports ,Pressure measurement ,Transducer ,Caveating Flows ,Flow (mathematics) ,[SPI.MECA.STRU] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph] ,Aerospace Propulsion - Abstract
International audience; The paper describes results of recent experiments carried out under similarity conditions in the Cavitating Pump Rotordynamic Test Facility for the dynamic characterization of cavitation-induced flow instabilities as simultaneously observed in the stationary and rotating frames of a high-head, three-bladed axial inducer with tapered hub and variable pitch. The flow instabilities occurring in the eye and inside the blading of the inducer have been detected, identified and monitored by means of the spectral analysis of the pressure measurements simultaneously generated in the absolute and relative frames by multiple transducers mounted on the casing near the impeller eye and on the inducer hub along the blade channels. The comparison of the results obtained in the two reference frames over a wide range of flow coefficients and cavitation numbers contributed to shed some light on the complex dynamic interactions between the cavitation-induced instabilities in the eye and in the blade channels of typical high-head inducers.
- Published
- 2018