AERODYNAMIC DESIGN OF A HIGH-LIFT SYSTEM WITH FLEXIBLE DROOP-NOSE FOR A LONG HAUL BUSINESS JET CONFIGURATION

The flexible droop-nose leading edge is studied and integrated into the aerodynamic design of the high-lift system for the Chinese Aeronautical Establishment Aerodynamics Validation Model (CAE-AVM) representing a transonic long haul business jet, through numerical and experimental investigations. The high-lift system design techniques and numerical tools have been proven efficient. The innovative configuration of CAE-AVM-HL (High-lift) featuring an inboard flexible droop-nose and outboard slat for the leading edge, a single slot Fowler flap at the trailing edge, provides good balance of the complexity and maximum lift coefficient. A 1:5.6 scale wind tunnel model has been made and tested in the 8x6 meter test section of DNW-LLF, the aerodynamic performance of CAE-AVM-HL with maximum lift coefficient 2.56 and stall angle of attack 19o satisfies design target. The correlation between CFD and experimental results has been validated. The effectiveness of the small flow control fences to eliminate early flow separation near the adjacent area of droop-nose and slat has been demonstrated.