.1662 工程科学学报.第43卷，第12期 1.0 1.0 0.9 ⊙ 0.9 (b) 0.8 End mixing rate 0.8 End mixing rate 0.7 0.7 0.6 0.5 0.5 0.4 04 0.3 0.3 0.2 0.2 0.1 Start mixing rate 0.1 Start mixing rate 0 0 0 2 4 68101214161820 024681012141618202224262830 Tarcked slab casted length/m Tarcked slab casted length/m 1.0 1.0 0.9 ⊙ 0.9 (d) 0.8 End mixing rate 0.8 End mixing rate 0.7 0.7 0.6 0 0.5 0.5 0.4 0.4 0.3 0.2 0.2 0.1 Start mixing rate 0.1 Start mixing rate 0 024681012141618202224262830 024681012141618202224262830 Tarcked slab casted length/m Tarcked slab casted length/m 图9模型计算的拉速为1.2mmin1时不同中间包内剩余钢液质量下不同浇注长度铸坯对应的混合率.(a)15t:(b)20t(c)25t:(d)30t Fig Mixing rate in the corresponding slab of different casting lengths with a casting speed of 1.2 mminunder different masss of residual molten steel in the tundish:(a)15 t;(b)20 t;(c)25t (d)30 t 0.180 0.180 Mass fraction of C corresponding (a) 等0178 Mass fraction ofC corresponding (b) to end mixing rate:0.1765 to end mixing rate:0.1765 言0.176 50.174 是Q1m Eai 里0.168 0.164 Mass fracton of Ccorrespod Mass fraction of Ccomespoding to start mixing rate:0.1634 0.160 0.160 to start mixing rate:0.163 0 4681012141618 20 0246810121416182022242628 Tarcked slab casted length/m Tarcked slab casted length/m 0.180 Mass fraction of C com 0.180 Mass fraction of C con nding 0.178 0.178 (d) to end mixing rate:0.1765 to end mixing rate:0.1765 台0.176 台0.176 80.174 营0.172 盟0170 0.170 0.168 兰0.168 30.166 30.166 0. 0.162 Mass fraction of C corresponding to start mixing rate:0.1634% 30.162 Mass fraction of Ccorrespording to start mixing rate:0.1634 0.160 0.160 024681012141618202224262830 024681012141618202224262830 Tarcked slab casted length/m Tarcked slab casted length/m 图10模型计算的拉速为1.2mmin时不同中间包内剩余钢液质量下铸流上不同浇注长度铸坯C元素质量分数的变化.(a)15t(b)20t:(c)25 t:(d)30t Fig.10 Chang of C content in the corresponding slab of different casting lengths with a casting speed of 1.2 m'min under different masss of residual molten steel in the tundish:(a)15 t;(b)20 t;(c)25 t;(d)30t1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 2 4 6 8 10 Tarcked slab casted length/m End mixing rate (a) Start mixing rate Calculated mixing rate 12 14 16 18 20 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 2 4 6 8 10 Tarcked slab casted length/m End mixing rate (b) Start mixing rate Calculated mixing rate 12 14 16 18 20 24 22 26 28 30 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 2 4 6 8 10 Tarcked slab casted length/m End mixing rate (d) Start mixing rate Calculated mixing rate 12 14 16 18 20 24 22 26 28 30 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 2 4 6 8 10 Tarcked slab casted length/m End mixing rate (c) Start mixing rate Calculated mixing rate 12 14 16 18 20 24 22 26 28 30 图 9    模型计算的拉速为 1.2 m∙min−1 时不同中间包内剩余钢液质量下不同浇注长度铸坯对应的混合率. （a）15 t；（b）20 t；（c）25 t；（d）30 t Fig.9    Mixing rate in the corresponding slab of different casting lengths with a casting speed of 1.2 m∙min−1 under different masss of residual molten steel in the tundish: (a) 15 t; (b) 20 t; (c) 25 t; (d) 30 t 0.180 0.178 0.176 0.174 0.172 0.170 0.168 0.166 0.164 0.162 0.160 0 2 4 6 8 10 Tarcked slab casted length/m Mass fraction of C corresponding to end mixing rate: 0.1765% Mass fraction of C corresponding to start mixing rate: 0.1634% Mass fraction of C corresponding to end mixing rate: 0.1765% Mass fraction of C corresponding to start mixing rate: 0.1634% Mass fraction of C corresponding to end mixing rate: 0.1765% Mass fraction of C corresponding to start mixing rate: 0.1634% Mass fraction of C corresponding to end mixing rate: 0.1765% Mass fraction of C corresponding to start mixing rate: 0.1634% (a) Calculated mass fraction of C/ % 0.180 0.178 0.176 0.174 0.172 0.170 0.168 0.166 0.164 0.162 0.160 Calculated mass fraction of C/ % 0.180 0.178 0.176 0.174 0.172 0.170 0.168 0.166 0.164 0.162 0.160 Calculated mass fraction of C/ % 0.180 0.178 0.176 0.174 0.172 0.170 0.168 0.166 0.164 0.162 0.160 Calculated mass fraction of C/ % 12 14 16 18 20 0 2 4 6 8 10 Tarcked slab casted length/m (b) 12 14 16 18 20 24 22 26 28 0 2 4 6 8 10 Tarcked slab casted length/m (d) 0 2 4 6 8 10 12 14 16 18 20 24 22 26 28 30 Tarcked slab casted length/m (c) 12 14 16 18 20 24 22 26 28 30 图 10    模型计算的拉速为 1.2 m∙min−1 时不同中间包内剩余钢液质量下铸流上不同浇注长度铸坯 C 元素质量分数的变化. （a）15 t；（b）20 t；（c）25 t；（d）30 t Fig.10    Chang of C content in the corresponding slab of different casting lengths with a casting speed of 1.2 m∙min−1 under different masss of residual molten steel in the tundish: (a) 15 t; (b) 20 t; (c) 25 t; (d) 30 t · 1662 · 工程科学学报，第 43 卷，第 12 期