With using geometric similarity 1：2 water model

the effect of nozzle structure (lateral holes type

hole dimension and clip angle：S1-rectangle

6868 mm

2

-25°； S2- racing way type

8468 mm

2

-15°； S3-ellipse

8011 mm

2

-15°)

casting speed (0.85~1.05 m/min) and immersion depth 55~75 mm on mold liquid level fluctuation

distribution of flow field and mold flux coverage condition has been studied. Results show that with decreasing dimension and dip angle of lateral holes

the liquid surface wave height increases

as dimension of lateral holes decreases by 5.4%

the wave height increases by about 32.4% ； with increasing casting speed and decreasing immersion depth the wave height increases； and with increasing dimension and dip angle of lateral holes and casting speed the i

mpact depth increases. With present nozzle S2 the fluctuation of liquid level is very small it is unfavorable for melting mold powder and uniformly heal-transferring and with present nozzle S1 the impact depth is too large

it is unavailable to remove inclusions in liquid

but with optimized nozzle S3 the fluctuation of liquid level and impact depth are more reasonable

the flux becomes more active

it is available to melt mold powder and remove inclusions in liquid.