Etude numérique des gains de performances et de capacité d'aspiration apportés par un étage axial contra-rotatif par rapport à une pompe mono-rotor.
TypeCommunications avec actes
This study deals with the development of an efficient method of design for subsonic conter-rotating axial flow turbomachineries. From specifications of a reference axial pump with only one rotor, two configurations of counter-rotating systems are studied : a system with a lower specific speed, and a system with a smaller specific radius. The numerical study is conducted in stationary regime, with a RANS-type turbulence model. Numerical simulations of the flow in stationary cavitating conditions use an homogeneous model at the thermodynamic equilibrium state. Results obtained for the two counter-rotating systems increase the yield of 12% for the same operating point. The first configuration decreases the size of 25%, which is a favorable for the manufacturing cost and the use in the system. The second configuration allows to obtain a lower speed of rotation (35%) which is beneficial for the increase of the suction capacity.
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NOURI, Hussain; DANLOS, Amélie; RAVELET, Florent; BAKIR, Farid; SARRAF, Christophe (2013)The purpose of this work is to study experimentally the aerodynamic characteristics of a subsonic counter-rotating axial-flow fans system operating in a ducted configuration. The fans of diameter D = 375 mm were designed ...
DANLOS, Amélie; MÉHAL, Jean-Elie; RAVELET, Florent; COUTIER-DELGOSHA, Olivier; BAKIR, Farid (ASME, 2014)Instabilities of a partial cavity developed on a hydrofoil, a converging-diverging step, or in an interblade channel have already been investigated in many previous works. The aim of this study is to evaluate a passive ...
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TOMOV, Petar; DANLOS, Amélie; KHELLADI, Sofiane; RAVELET, Florent; SARRAF, Christophe; BAKIR, Farid (IOP sciences conference series, 2015)The fact of injecting bubbles into a cavitating flow influences typical cavitating behavior. Cavitation and aerated cavitation experiments has been carried out on a symmetrical venturi nozzle with convergent/divergent ...
DANLOS, Amélie; MEHAL, Jean-Elie; SARRAF, Christophe; RAVELET, Florent (2010)This paper presents experimental and numerical results concerning the operation of a configuration that includes an axial pump and a bundle of tubes that mimics the cool source of a heat exchanger. The pump used in the ...