Numerical Study on the Effect of an Off-Surface Micro-Rod Vortex Generator Placed Upstream NACA0012 Aerofoil
Article dans une revue avec comité de lecture
In this paper, 3D numerical simulations have been carried out to enhance the understanding of a flow over a passive control device composed of micro cylinder with, d/c = 1.34% placed in the vicinity of NACA0012 aerofoil wing, by means of γ–Reθt transition sensitive turbulence model meant to predict the separation induced by transition achieved for aerofoils operating at moderate Reynolds number (Re = 4.45×105). Results show that the separation of the boundary layer has been eliminated by the passive static vortex generator at stall regime due to the injection of free-stream momentum to the boundary layer. The early transition to turbulent state overcomes the local flow deceleration of an adverse pressure gradient and remains sticked to the wall the boundary layer. Furthermore, the wing aerodynamic performance are improved as drag is reduced and lift is enhanced which is straight forward linked to the lift to drag ratio gain that varies from 22.68% to 134.17% at post stall angles of attack.
Showing items related by title, author, creator and subject.
Improved Aerodynamics of a Hollow-Blade Axial Flow Fan by Controlling the Leakage Flow Rate by Air Injection at the Rotating Shroud Article dans une revue avec comité de lecturePEREIRA, Michaël; RAVELET, Florent; AZZOUZ, Kamel; AZZAM, Tarik; OUALLI, Hamid; KOUIDRI, Smaïne; BAKIR, Farid (MDPI AG, 2021-07)Axial flow fans are used in many fields in order to ensure the mass and heat transfer from air, chiefly in the heating, ventilation and air conditioning industry (HVAC). A more proper understanding of the airflow behavior ...
Experimental investigation of an actively controlled automotive cooling fan using steady air injection in the leakage gap Article dans une revue avec comité de lectureAZZAM, Tarik; PARIDAENS, Richard; RAVELET, Florent; KHELLADI, Sofiane; OUALLI, Hamid; BAKIR, Farid (SAGE Publications, 2017)In an axial fan, a leakage flow driven by a pressure gradient between the pressure side and the suction side occurs in the gap between the shroud and the casing. This leakage flow is in the opposite direction to the main ...
Article dans une revue avec comité de lectureNGUYEN, Van Thang; DANLOS, Amélie; RAVELET, Florent; DELIGANT, Michael; SOLIS, Moises; KHELLADI, Sofiane; BAKIR, Farid (MDPI AG, 2021-12-18)Centrifugal compressors are widely used in many industrial fields such as automotive, aviation, aerospace. However, these turbomachines suffer instability phenomenon when the flow rate is too high or too low, called rotating ...
CFD Analysis to explain the Operating range extension observed during Operation in Co-rotating Mode of a Twin-impeller Centrifugal Compressor Article dans une revue avec comité de lectureNGUYEN, Van-Thang; DANLOS, Amelie; RAVELET, Florent; DELIGANT, Michael; SOLIS, Moises; KHELLADI, Sofiane; BAKIR, Farid (EDP Sciences, 2021-11)Centrifugal compressors are widely used in many industrial applications because of their advantages. However, these turbomachines suffer at a low-flow rate from instabilities, such as rotating stall and surge. That leads ...
Article dans une revue avec comité de lectureNGUYEN, Van-Thang; ABED, Cheikh Brahim; DANLOS, Amelie; RAVELET, Florent; PARIDAENS, Richard; DELIGANT, Michael; KHELLADI, Sofiane; BAKIR, Farid (American Society of Mechanical Engineers, 2021-10-13)The present study deals with a low pressure-ratio centrifugal compressor consisting of two counter-rotating rotors called a Counter-Rotating Centrifugal Compressor (CRCC). The design method based on the loss model was ...