Influence de la répartition de la charge sur les performances d'une turbomachine axiale contrarotative
Communication avec acte
Due to high requirements of energy consumption level, weight and dimension restriction in many industrial fields, compact axial turbomachines are expected. Counter-rotating axial-flow fans may be a solution. The design and optimization of such a system is a scientific and technological challenge, particularly because of very complex phenomena produced by the interaction of highly unsteady flows. Experimental measurements of overall performance, wall pressure fluctuations and velocity have been performed on a reference system. The design method has first been validated, and the effects of the distance between the two rotors and of the rotational speed ratio have been studied. The results show a surprising optimum operating range. We present a set of results comparing the performances of four contra-rotating systems that have been designed for the same operating point. These stages differ in their distribution of load between the rotors, and in the slope of the characteristic of their first rotor. In addition, we explore the effects of these parameters on the robustness of the performance of the stage with respect to the variation of the speed ratio of the two rotors.
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Experimental investigation on the effect of load distribution on the performances of a counter-rotating axial-flow fan Article dans une revue avec comité de lectureRAVELET, Florent; BAKIR, Farid; SARRAF, Christophe; WANG, Juan (Elsevier, 2018)In the design procedure of a counter-rotating axial-flow stage, parameters such as the angular velocity ratio and the repartition of the work performed by each rotors are to be chosen. In the present Article, three ...
Influence of design parameters on the global performances of low-speed counter-rotating axial-flow fans Communication avec acteWANG, Juan; RAVELET, Florent; BAKIR, Farid (2014)The present work aims at experimentally investigating the effects of some parameters on the performances of a counter-rotating stage, and on the instationary flow between the rotors. Three counter-rotating fans, which have ...
Experimental comparison between a counter-rotating axial-flow fan and a conventional rotor-stator stage Communication avec acteWANG, Juan; RAVELET, Florent; BAKIR, Farid (2013)Based on the requirement of energy consumption level and weight and dimension restriction, compact axial machines are highly demanded in many industrial fields. The counter-rotating axial-flow fans could be a promising way ...
Performance gains provided by the use of a counter-rotating axial-flow fan with respect to a conventional rotor-stator stage Article dans une revue avec comité de lectureWANG, Juan; RAVELET, Florent; BAKIR, Farid (Ethan Publishing Company, USA, 2015)The adoption of counter-rotating stages for propellers, axial-flow pumps and low-speed fans has opened a way to design high performance and compact turbomachines in various industrial domains, leading to potentially high ...
Experimental study of blade rigidity effects on the global and the local performances of a thick blades axial-flow fan Communication avec acteNOURI, Hussain; RAVELET, Florent; SARRAF, Christophe; BAKIR, Farid (ASME, 2010)An experimental investigation on the aerodynamic performances of thick blades axial-flow fans was carried out in this study. Two fans are considered, the first one is rotomoulded (in plastic) and the second one is milled ...