A HYBRID METHOD IN DETERMINING SKIN FRICTION FIELDS ON THE SURFACE OF FLYING OBJECTS

The study of friction fields on object surfaces plays an important role in fluid mechanics. In this study, a hybrid method, which combines the cross-correlation algorithm and the optical flow algorithm, is developed to calculate the skin-friction field based on the oil distribution on the surface. The scientific basis of the method is presented. Based on this, a computational program is developed and applied to flow calculations over different object surfaces, including an aircraft wing at a high angle of attack, a wing with a low aspect ratio, a delta wing, and the axisymmetric boattail of a flying object. The computational results show that this method effectively determines the flow characteristics of the surface skin-friction field. Flow characteristics, including separation and reattachment locations, are analyzed. Additionally, the influence of computational parameters on the results is specifically presented. This method demonstrates high efficiency and can be applied to future research and aircraft designs.