Abstract:

The interaction mechanism between sand particles and the bed surface in aeolian sand flow constitutes a key issue in aeolian physics research. Owing to the complexity of sand particle movement， the research results from numerical simulation typically deviate significantly from the actual situation. Consequently， the splash functions obtained through experimental means holds great significance for understanding the physical process of particle-bed collision. Based on the consensus that the influence of airflow in saturated aeolian sand flow on the collision process can be neglected， scholars conduct splash functions research by means of a large number of windless collision experiments. However， due to limitations in measurement technology， there are scarce measured data of the particle-bed collision process under the typical impact angle of 10°. Considering that both numerical simulation and windless collision experiments indicate that the splash functions are sensitive to the impact angle， a large number of particle-bed collision processes with an impact angle around 10° on the surface of a loose sand bed are obtained in a wind tunnel by utilizing high-speed photography technology. Combined with the experimental results of predecessors' sand grain centrifugal launcher （with an impact angle ranging from 20° to 50°）， the splash functions covering a wide range of impact angles are constructed. These functions can be applied to the wind tunnel experiment results of predecessors under different experimental conditions， which is of great significance for future research in aeolian physics.

Key words: splash functions, saltation movement, wind tunnel experiment, particle-bed collision process, high-speed photography technology