Performance gains provided by the use of a counter-rotating axial-flow fan with respect to a conventional rotor-stator stage
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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 savings in energy consumption. Because of the reduction of rotational speed and a better homogenization of the flow downstream of the rear rotor, these machines may have very good aerodynamic performances. However, they are rarely used in subsonic applications, mainly due to poor knowledge of the aerodynamics in the mixing area between the two rotors, where very complex structures are produced by the interaction of highly unsteady flows. The purpose of the present work is to compare the global performances (static pressure rise and static efficiency) and the wall pressure fluctuations downstream of the first rotor for three different stages operating at the same point: a single subsonic axial-flow fan, a conventional rotor-stator stage and a counter-rotating stage that have been designed with in-house tools. The counter-rotating stage allows large savings of energy with respect to the other two systems, for lower rotation rates and by adjusting the distance between the two rotors, a solution with comparable wall pressure fluctuations levels for the three systems is found.
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Influence of design parameters on the global performances of low-speed counter-rotating axial-flow fans WANG, 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 WANG, 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 ...
Experimental investigation on the effect of load distribution on the performances of a counter-rotating axial-flow fan RAVELET, Florent; BAKIR, Farid; SARRAF, Christophe; WANG, Juan (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 de la répartition de la charge sur les performances d'une turbomachine axiale contrarotative WANG, Juan; RAVELET, Florent; BAKIR, Farid; SARRAF, Christophe (2013)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 ...
NOURI, Hussain; RAVELET, Florent; BAKIR, Farid; SARRAF, Christophe; REY, Robert (ASME, 2012)An experimental study on the design of counter-rotating axial-flow fans was carried out. The fans were designed using an inverse method. In particular, the system is designed to have a pure axial discharge flow. The ...