ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Numerical simulation of separated flow around a multi-element airfoil at high angle of attack with iced slat
Received date: 2016-08-31
Revised date: 2016-11-03
Online published: 2016-11-21
Supported by
National Basic Research Program of China (2015CB755800); National Natural Science Foundation of China (11172240); Aeronautical Science Foundation of China (2014ZA53002)
The improved delayed detached eddy simulation (IDDES) based on the shear-stress-transport (SST) turbulent model is applied in the numerical simulation of complex separated flow caused by a typical horn-like ice on the slat leading edge of a multi-element airfoil under a large angle of attack. The reliability and applicability of the numerical method is verified based on the analysis of the standard example of the separation flow and the example of the clean multi-element airfoil. Results of numerical simulation of the slat in icing condition show that the horn ice on the leading edge will lead to formation of a large scale separation bubble with relatively stable structure at high angle of attack. The unsteady wake of the separation bubble will generate relatively strong interference with the flow field around the leading region of the main wing, resulting in the decline of acceleration effect of the flow from the gap and the decrease of slat lift augmentation efficiency. Near the stall point, as the backflow intensity of separation bubble increases with the angle of attack of the incoming flow and the wake vortex transport direction gradually deviates from the wall surface, the range and intensity of the influence area of the wake are increased.
ZHANG Heng , LI Jie , GONG Zhibin . Numerical simulation of separated flow around a multi-element airfoil at high angle of attack with iced slat[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017 , 38(2) : 520733 -520746 . DOI: 10.7527/S1000-6893.2016.0285
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