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International Journal of Aerodynamics (2 papers in press)
Computational Study of aerodynamic performance and flow structure around NACA 23012 wing by James Dent, Joshua Robson, Alessio Basso, Alexander Ellin, Atma Prakash, Faik Hamad Abstract: The structure of the external flow field around the wing of a Lobet Ganagobie light aircraft is investigated in this paper by using Computational Fluid Dynamics method (CFD). A model has been developed to mimic the NACA 23012 geometry and used to simulate the flow around it. A wind tunnel is used to collect new experimental data for lift coefficient to verify the accuracy of the model at Reynolds numbers, Re = 0.3 x 106. Then, the CFD model is utilised to produce velocity streamline plots and pressure and velocity contours at hiher Re number (2 xl06 3 x 106) to have a better understanding of the flow around Lobet Ganagobie wing model. rnThe turbulence model is selected based on the comparison of experimental data with results from different CFD models. Driven by the abrupt stalling characteristics of the NACA 23012 airfoil section, the model is used to predict the position of the stagnation point on the airfoil so that a stall waning device can be sensibly located. rn Keywords: CFD simulation; finite wing; lift coefficient; drag coefficient; stagnation point; flow separation.
Design of an external six-component wind tunnel balance with floating frame by Miguel Angel AGUIRRE, Ramiro Bracco, Fabio Milanese, Matias Meroniuc Abstract: This paper details the design procedure of a wind tunnel aerodynamic balance. It is the six-component external balance with floating frame used in our main Eiffel-type wind tunnel. This balance has the unique feature of being able to receive full and half wind tunnel models. Firstly, a set of design requirements and specifications is defined. Then the conceptual and detailed design of the mechanism is deeply explained. Finally, an analytical model of the balance is developed and used in order to study the effect of the design loads: this allowed sizing of the load cells and the counterweights of the balance. Keywords: experimental aerodynamics; wind tunnel; external balance; floating frame; half model; full model; design procedure; force measurement.