In order to optimize the submerged entry nozzle (SEN) for 200 mm x 1 300 mm vertical slab casting mold

the effect of parameters of nozzle structure (cross section dimension of side port- 40 mm x40 mm and 40 mm x80 mm

and angle of port- + 15° and - 15°) and process parameters ( submerged depth 100 ~ 130 mm and casting speed 0. 45 ~ 0. 65 m/min) on fluctuation of liquid level has been simulated and studied by 1 ： 1 water model. Results show that the effect of nozzle structure parameters on fluctuation of liquid level is more obvious and the structure of 2

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nozzle with side port dimension 40 mm x40 mm and angle of port +15° has better service performance； the effect of submerged depth on fluctuation of liquid level isn' t appreciable ； and the effect of casting speed

on fluctuation of liquid level relates to nozzle structure

and the descending order of sensitivity of nozzle structure to casting speed is nozzle 2

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(40 mm x40 mm

+15°)

nozzle 4

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(40 mm x40 mm

- 15°)

nozzle 3

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(40 mm x 80 mm

- 15°) and nozzle 1

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(40 mm x 80 mm

+ 15°).