不同形状涵道风扇推进特性数值分析

With distributed ducted fans propulsion as the background，the Reynolds-averaged Navier-Stokes （RANS） equation was solved by using multiple reference frame （MRF） and momentum source method （MSM） with given force distribution ， and numerical simulation analysis of ducted fans with different shapes was carried out. The interaction between the fan panel and the duct wall with different shapes was analyzed and compared. Then numerical calculation of distributed ducted fans with different shapes was carried out. It showed that the circle ducted fan had the best propulsion characteristics，while the square ducted fan had the worst. The propulsion characteristics of the rectangular to circular ducted fan was between them. The existence of corners in non-circular ducted fan could induce separation of the inner flow and generate interference resistance， and the smaller radius of the corner indicated the more significant influence. The non-circular duct wall affected the fan inlet area and the size of the blade tip vortex. Therefore， the ducted fan propulsion efficiency was affected via the fan panel efficiency and lip suction.