Considering the problem of silo design

the silo ejector model and ejector function were proposed. The properties of the static pressure matching function were studied. The critical conditions and ranges of the engine total pressure

the cross-sectional area of the silo and the outlet pressure of the mixing chamber were analyzed. This proved impossible to achieve the first limit of ejector

the zero points of the cross-sectional area of secondary flow and the constant velocity point; when the third limit of the ejector was not reached

the characteristic curve was subjected to the static pressure matching function; when the state of the ejector ranged from the third limit to the minimum limit

the characteristic curve was subjected to the optimal static pressure function; when the ejector worked in the over-congestion state

the characteristic curve was subjected to the minimum static pressure function. The results provide an important guidance for the design of silos and ejectors.