Influence analysis and optimization of distribution-propulsion-wing parameters with target aerodynamic characteristics

The influence of chord length and position on the design results of the Distribution-Propulsion-Wing (DPW) is compared at the same target lift and pitching moment, based on a two-dimensional inverse design method of the DPW aiming at chordwise circulation distribution. Additionally, the two-dimensional shape optimization design of the DPW is conducted to achieve minimum drag, minimum total pressure loss and minimum velocity distribution distortion of the disk inlet. The results show that the average relative error between the distribution of the chordwise circulation and the target value is 0.058 7 in the inverse design test. In the analysis of the duct parameter influence, a fixed chord length of the upper duct wall and a forward chord position, or a fixed trail edge position of the duct wall and a longer chord length lead to a lower surface drag and a higher lift coefficient slope, while the pitch moment slope changes from negative to positive as the angle of attack changes. After the optimization, the position of the two-dimensional DPW duct wall moves forward, the drag coefficient decreases by 160%, the total pressure of the disk inflow basically does not lose, and the velocity distribution uniformity is further increased.