关键词: 板坯结晶器, 水模型, 浸入式水口结构, 液面波动, 流场, 保护渣层

Abstract: With using geometric similarity 1：2 water model, the effect of nozzle structure (lateral holes type, hole dimension and clip angle：S1-rectangle, 6868 mm², -25°； S2- racing way type, 8468 mm², -15°； S3-ellipse, 8011 mm² , -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 impact 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.