Numerical study on powder fluidization and conveying characteristics of powder supply device with built-in intake under high-pressure
A powder feeding device with a built-in intake channel was designed for the piston-driven powder fuel supply system in powder engines,the piston movement was realized by using the User Defined Function(UDF),and the action of the coupling of the gas-powder-piston was established.Numerical simulation was carried out to investigate the powder fuel supply characteristics under different initial operating pressures(0.6,1.2,1.8,2.4,3.0 and 3.6 MPa)in the powder storage tank based on the Eulerian-Eulerian two-fluid model.The results showed that the gas-solid interface mainly fluctuated around the intake under different initial operating pressures.With the increase of the initial operating pressure,the fluctuation amplitude of the powder flow rate decreased,the mean powder flow rate within the stable conveying stage was closer to the theoretical value,and the fluctuation amplitude of the powder layer(powder volume fraction of 0.1)area decreased;the area-averaged volume fraction of solid phase at the two-phase nozzle throat section increased with the increase of the initial operating pressure in the storage tank,but the fluctuation amplitude of the granular temperature decreased.The pressure in the storage tank at an initial operating pressure of 3.6 MPa was kept stable for a longer period compared with 0.6 MPa,and the pressure fluctuation in the storage tank was reduced by 59.1％.
powder enginefluidized conveying at high pressuretwo-fluid modelbuilt-in intake structuregas-solid two-phase flowpiston-type feeding device
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