Numerical Simulation for Changes in Aerodynamic Characteristics along the Spanwise of "Diamond back" Wing

Based on the geometry shape and design parameters of the "Diamond back" wing, the changes in aerodynamic parameters along the spanwise of "Diamondback" wing at low Reynolds number are simulated by two-dimensional computational model which uses NACA6411 airfoil. The simulation results indicate that the Transition SST turbulence model have high accuracy and creditability in solving the problem of flowing around airfoil at low Reynolds number which is undemanding to stalling characteristics; The changes in aerodynamic characteristics along the spanwise of "Diamond back" wing are mainly caused by two reasons, one is the high-pressure and low-pressure region of the lower surface of anterior airfoil which are formed by the high pressure around stagnation point at the leading edge and the differential pressure between the upper and lower surface of the posterior airfoil, the other is differential pressure change of posterior airfoil caused by air blocking; When the vertical height difference of the anterior and posterior wing is 0, these effects are mainly reflected on the part of the leading edge distance between the anterior and posterior wing that is less than 350mm; When the value is greater than 350mm, aerodynamic performance achieves optimal and aerodynamic parameters keep almost unchanged. (C) 2015 The Authors. Published by Elsevier Ltd.