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Numerical investigation on Coanda flow over a logarithmic surface
CaiYin Gan,Khairul Salleh Mohamed Sahari,ChingSeong Tan 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.7
The Coanda effect has been introduced into lift generation designs. In this paper, a logarithmic spiral surface is introduced as a curvatureshape to evaluate the development of jet flow along the Coanda curvature. Moreover, 2D computational fluid dynamics numericalsimulation is adopted to measure velocity profile, jet width growth, maximum velocity decay, and surface static pressure along the curvaturesurface. A parametric study on the effect of varying exit jet heights on the Coanda effect is also presented. Results show that jetwidth grows proportionally along the curved surface, and the proportional decay of maximum velocity and surface pressure is lower thanthe atmospheric pressure. A wider exit jet height produces lower static pressure on the unmanned aerial vehicle surface and a slowermaximum velocity decay. Overall parametric analysis of varying exit jet heights shows that the effective range of d/R is 0.1 to 0.14.