Blended-wing-body Configuration Aerodynamic Interference of Airframe-power Plant with Air Intake and Exhaust Effects
High aerodynamic efficiency is a critical advantage of blended-wing-body configuration compared to other next generation civil transport aircraft configurations.In order to maintain this advantage,lots of efforts should be taken to construct power plant layout suitable to blended-wing-body configuration which decrease the harmful effect of aerodynamic interference between airframe and engine.In this paper,high reliability CFD technology and TPS(Turbine Propulsion Simulator)nacelle are used to carry out numerical simulations of the coupled internal and external flow in a blended-wing-body configuration with podded engines.The numerical simulations aim at characteristics of aerodynamic interference between airframe and power plant,especially the effect of air flow intake and exhaust at different engine operations during cruise.Numerical results show that aerodynamic interference decreases lift coefficient of blended-wing-body and increases drag significantly.High pressure area induced by overflow of nacelle on upper surface of blended-wing-body is the primary factor for this.Increasing engine speed,the boundary layer ingestion is enhanced,which relieves the harmful interferential lift coefficient.As to the section of TPS without engine jet,at low engine speed,suction of nacelle lip is rather strong.However,increasing to full engine speed,the suction is counteracted and this section induces drags.
blended-wing-bodypower plant layoutpodded engineairframe-engine integrationTPS nacellecouple of internal and external flowaerodynamic interference
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