Based on similarity theory

according to a 28-t prototype 3-strand T-type tundish for casting Φ380 mm bloom

the effect of flow control devices on characteristics of flow field in tundish in casting conditions of casting speed- 0. 3 - 0. 9 m/min and liquid level-600 ~ 1 200 mm has been studied by using experimental similarity ratio λ= 1： 2 water model. Results show that in condition of tundish liquid level about 500 mm in commercial production status

with casting speed

<

0. 4 m/min

the effect of flow control devices on flow field characteristics is not obvious i. e. it is not needed to locate flow control devices ； with casting speed

≥

0. 4 m/min and

<

0. 7 m/min

it is available to using tundish located weirs; and with casting speed ≥0. 7 m/min

the structure of weirs with turbulent inhibitor is favourable to be used to optimize the charac

teristics of flow field in tundish. It is obtained by analysis on flow field in tundish that to locate flow control devices the disorder degree of pouring flow should be decreased as far as possible and the turbulent energy of liquid flow is depleted as much as possible in pouring region.