Abstract
The objective of this research is to design, develop and compare the effectiveness of upper slot blowing on three Circulation Control Wings (CCWs) and to find the configuration that gives the best lift augmentation. A low-speed wind-tunnel experimental study is undertaken to evaluate the effect of upper slot blowing along the span over four different Trailing-Edge (TE) Coanda surfaces on three 3-D CCWs for the purpose of lift augmentation. Wind tunnel tests are conducted at Mach numbers of 0.022, 0.024, 0.029 and 0.04, at Reynolds numbers of 0.67 × 10 to 1.26 × 10 with moment coefficients of blowing from 0.0 to 0.011. It is found that the (2:1) Coanda surface configuration is the most effective in all three CCWs. At Ma = 0.022 and α = 18, the (2:1) Coanda surface on the symmetrical NACA0015 CCW gives the maximum ∆CL = 0.2 at Cμ = 0.011. The maximum lift augmentation ratio of 61 is observed with the (2:1) Coanda surface on the S8036 CCW at α = 2.
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