When annular rotary jet injects across the main flow, its curved shape and the process of dispersing the upper corners gas accumulation of U shaped working face are analyzed.

Based on the basic theory and related research achievements of jet, the entrainment and dilution effects of rotary jet on gas with high concentration were analyzed, and its deforming and curving characteristics during crosscutting the main airflow of coal faces was discussed.

This paper studies the surface character of the coal log in constant flow in pipe experimentally,acquire the normal rules of the pressure distribution,which is significant for studying the movement of the coal log in constant flow in pipe.

The effect of free surface being neglected, a computation of the flow around a hydrodynamic fin(HF),which is installed on the stem of HSVA tanker model, by solving the incompressible RANS equations using the method of flux - difference splitting upwind differential scheme is presented in this paper.

This paper analyzes the pressure distribution around the stationary cylindrical Model based on the experiment using the theory of flow.