Ejector Function Method for Flowfield Analysis of Silo

Aiming at 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 were analyzed when the engine total pressure, the diameter of the silo, and the outlet pressure of the mixing chamber changed. It is proved that the curve that shows the inlet pressure of the mixing chamber changes along with the outlet pressure of the mixing chamber is a straight line parallel to the horizontal axis when the outlet pressure of the mixing chamber is smaller than the stagnation critical point, the curve that shows the inlet pressure of the mixing chamber changes along with the total pressure of the nozzle develops along the optimal pressure function curve when the total pressure of the nozzle is greater than the stagnation critical point, and the curve that shows the inlet pressure of the mixing chamber changes along with the diameter of the mixing chamber develops along the optimal pressure function curve when the diameter of the mixing chamber is smaller than the stagnation critical point. The characteristic curves of the silo ejector and the ideal ejector were compared when imbalance or wall friction were of concern, respectively, which show that the degree of imbalance has little effect on the calculation results of the silo ejector and the wall friction has a significant effect, especially near the stagnation point. The results provide important guidance for the design of silos and ejectors. Finally, the reliability of the ejector function method is verified by comparing the experimental data with the theoretical results.