The difference of the aerodynamic influence of two engine models – the Flow Through Nacelle (FTN) and With Powered Nacelle (WPN) – on BWB300 airframe is analyzed by using the 3-D unsteady compressible Reynolds-Averaged Navier-Stokes (RANS) computation. The results indicate that at cruise condition, the engine shape is a primary factor affecting the BWB airframe upper fuselage surface flow, the two engine models exhibit a similar aerodynamic influence on the BWB airframe. However, at takeoff condition, the two engine models’ aerodynamic influence on the airframe is different, because of the air suction caused by the WPN engine model affecting the airframe upper fuselage surface flow obviously. Moreover, at both cruise and takeoff conditions, the tube formed by the engine and airframe shape changes the surface flow under the engine and the air suction caused by the engine power accelerates the surface flow near the engine.

通过使用3-D不稳定的可压缩雷诺平均Navier-Stokes（RANS）计算，分析了两种发动机模型–流通式机舱（FTN）和动力式机舱（WPN）对BWB300飞机的空气动力学影响的差异。结果表明，在巡航状态下，发动机形状是影响BWB机身上部机身表面流动的主要因素，这两种发动机模型对BWB机身都表现出相似的空气动力学影响。然而，在起飞条件下，这两种发动机模型对机身的空气动力影响是不同的，这是由于WPN发动机模型引起的吸力明显影响机身上机身表面流。而且，在巡航和起飞条件下，