摘要 :
Following an engine failure, a turbojet multi-engine aircraft experiences the yawing moment generated by the thrust asymmetry, whereas a wing-mounted turboprop airplane will also face a significant rolling moment due to aerodynami...
展开
Following an engine failure, a turbojet multi-engine aircraft experiences the yawing moment generated by the thrust asymmetry, whereas a wing-mounted turboprop airplane will also face a significant rolling moment due to aerodynamic wing loading asymmetry. The one-engine-inoperative (OEI) condition of a propeller-driven multi-engine aircraft, critical for directional control, may also be critical to the lateral control concept definition. Therefore, in early design phases, the wing loading asymmetry evaluation is mandatory to properly assess the OEI condition and its possible impact on lateral control sizing. The proposed work aims at modeling the lateral aerodynamic asymmetry in OEI using a modified lifting-line theory coupled with an independent propeller model that provides the slipstream induced velocities in the wing. The result obtained using the methodology was compared with wind tunnel data [1] to validate that the low-fidelity formulation captures satisfactorily the lateral aerodynamic asymmetry phenomenon in OEI. The analysis of the wing aerodynamic loading asymmetry also provided physical insights in order to identify the dominant contribution regarding the propeller slipstream components. Finally, a straightforward calculation was performed for a conventional turboprop aircraft in OEI and the lateral aerodynamic asymmetry was compared with typical aileron rolling moment coefficient to address the possible impact on lateral control sizing. The proposed modeling provided sufficient information to initially address the lateral control sizing of turboprop multi-engine aircraft without requiring detailed information about airfoil and propeller geometry.
收起
