Abstract:In order to further solve the problem of exhaust gas suction in ladle bakering during baking process, the structure of twostage diffuser ejector with multinozzle was put forward. The new ejector was simulated by Fluent software, and the effects of different nozzle numbers and nozzle′s amount and those of the structure of twostage diffuser on smoke suction were analyzed. The simulation results showed that with the increase of the nozzle number′s amount, the lower pressure zone produced by the working fluid in the receiving chamber became more obvious. And the increasing of the nozzle′s amount number made the blending effect better and more uniform between the working fluid and the exhaust gas, and the velocity distribution range decreased. There was a velocity dead zone or reflux zone at the exit of the singlestage diffuser, but none in the twostage diffuser structure and the effects of diffusion became more obvious. The overall ejection effects of the ejector have been greatly improved. The ejection coefficient of the twostage diffuser ejector with fournozzle was as high as 1.42 when the relative pressure of working fluid was 0.3 MPa and the relative pressure that of the exhaust gas was 200 Pa.
Bauer R C, German R C, Panesci J H. Methods for determining the performance of ejector-diffuser systems.[J]. Journal of Spacecraft & Rockets, 2012, 3(2):193-200.