The Research on Critical Velocity of Sucking-airflow Affected by Annular Jet

A thorough research on the crucial velocity of sucking airflow affected by annular jet is conducted. The crucial velocity in different conditions on the designed experiment appliance is measured, including different quantity of sucking air, different siges of blade and different width of pushing air inlet. By using regression method, the relationship between critical velocity and different conditions is established, and an important parameter for research and utilization of this kind of airflow is proposed.