第8期 陆巧彤等：F数计算及其与板坯连铸结晶器内钢水卷渣的关系 ,815. 大小，使之在3~5之间取值，就可以有效地将结晶 [2]Thomas B G,Mika L J,Najjar F M.Simulation of fluid flow in- 器内钢液面的波动控制在合理的范围内，从而有效 side a continuous slab-casting machine.Metall Mater Trans B. 1990,21B,387 地减小和避免卷渣，F数的值是通过调整各工艺参 [3]陈永范，陈德杰，李权·大板坯连铸结晶器内流场实验研究 数的取值来控制的，故F数就像一座桥梁，通过它 炼钢，1998(2)：25 即可很方便地将连铸工艺参数的选择与控制结晶器 [4]Gupta D.Lahiri A K.A water model study of the flow asymme- 内钢液卷渣联系起来， try inside a continuous slab casting mold.Metall Mater Trans B. 1996,27B.757 4结论 [5]Audrzejewski P.Kohler K U.Pluschkell W.Model investiga- tions on the fluid flow in continuous casting moulds of wide dimen- (1)采用数值模拟方法先计算出结晶器内钢液 sions.Steel Res.1992(6):242 的流场，然后从计算结果中调用相应的计算F数所 [6]Najar F M,Thomas B G.Hershey D E.Numerical study of 需的参数，即可很方便地计算出液面波动指数一 steady turbulent flow through bifurcated nozzles in continuous F数， casting.Metall Mater Trans B.1995,26B:749 (②)将F数控制在3~5即可以将液面波动控 [7]Gupta D.Lahiri A K.Water modeling study of the surface dis- turbances in continuous slab caster.Metall Mater Trans B.1994. 制在士(35)mm的合理范围内，卷渣的几率 25B:227 最小. [8]Panaras G A.Theodorakakos A.Bergeles G.Numerical investiga" (③)增大结晶器宽度、增加拉速、减少浸入式水 tion of the free surface in a continuous steel casting mold model. 口浸入深度和减小水口出口向下倾角均会使F数 Metall Mater Trans B.1998.29B:1117 增加，即增大结晶器内卷渣的倾向， [9]Teshima T,Kubota J,Swuki M,et al.Influence of casting con ditions on molten steel flow in continuous casting mold at high (4)调整各工艺参数使F数控制在3~5的范 speed casting of slabs (in Japan).Iron Steel.1993.79(5):576 围内就可以减小或避免结晶器内的卷渣， [10]Teshims T.Osame M.Okimoto K,et al.Improvement of sur- face property of steel at high casting speed//Steelmaking Confer- 参考文献 ence Proceedings.Warrendale:Iron and Steel Society.1988:111 [1]万晓光，韩传基，蔡开科.连铸板坯结晶器浸入式水口试验研 [11]Launder B E.Spalding D B.The numerical computations of tur- 究.钢铁，2000,35(9)：20 bulent flows.Comput Method Appl Mech Eng.1973(3):269 Calculation of F value and relationship between F value and slag entrapment in a slab continuous casting mold LU Qiaotong,WANG Xinhua,YU Huixiang,ZHA NG Jiongming,WANG Wanjun Metallurgical and Ecological Engineering School,University of Science and Technology Beijing.Beijing 100083.China ABSTRACI To control slag entrapment,a new method was put forward to calculate the level fluctuation in- dex,i.e.F value,which was defined by other researchers.F value could easily be calculated based on the re- sults of numerical simulation of slab continuous casting mold flow.The relationship between F value and level fluctuation in the mold as well as operational technological parameters were also studied.It is shown that using the data of numerical simulation of slab continuous casting mold flow can easily calculate F value.By adjusting operational technological parameters,the range of F value can be controlled in 3-5,and the surface fluctuation in (3-5)mm,as a result,slag entrapment can be avoided. KEY WORDS slab continuous casting;mold;F value;mold powder entrapment大小‚使之在3～5之间取值‚就可以有效地将结晶 器内钢液面的波动控制在合理的范围内‚从而有效 地减小和避免卷渣．F 数的值是通过调整各工艺参 数的取值来控制的‚故 F 数就像一座桥梁‚通过它 即可很方便地将连铸工艺参数的选择与控制结晶器 内钢液卷渣联系起来． 4 结论 （1） 采用数值模拟方法先计算出结晶器内钢液 的流场‚然后从计算结果中调用相应的计算 F 数所 需的参数‚即可很方便地计算出液面波动指数——— F 数． （2） 将 F 数控制在3～5即可以将液面波动控 制在±（3～5） mm 的合理范围内‚卷渣的几率 最小． （3） 增大结晶器宽度、增加拉速、减少浸入式水 口浸入深度和减小水口出口向下倾角均会使 F 数 增加‚即增大结晶器内卷渣的倾向． （4） 调整各工艺参数使 F 数控制在3～5的范 围内就可以减小或避免结晶器内的卷渣． 参 考 文 献 ［1］ 万晓光‚韩传基‚蔡开科．连铸板坯结晶器浸入式水口试验研 究．钢铁‚2000‚35（9）：20 ［2］ Thomas B G‚Mika L J‚Najjar F M．Simulation of fluid flow in￾side a continuous slab-casting machine．Metall Mater Trans B‚ 1990‚21B：387 ［3］ 陈永范‚陈德杰‚李权．大板坯连铸结晶器内流场实验研究． 炼钢‚1998（2）：25 ［4］ Gupta D‚Lahiri A K．A water model study of the flow asymme￾try inside a continuous slab casting mold．Metall Mater Trans B‚ 1996‚27B：757 ［5］ Audrzejewski P‚Kòhler K U‚Pluschkell W．Model investiga￾tions on the fluid flow in continuous casting moulds of wide dimen￾sions．Steel Res‚1992（6）：242 ［6］ Najjar F M‚Thomas B G‚Hershey D E．Numerical study of steady turbulent flow through bifurcated nozzles in continuous casting．Metall Mater Trans B‚1995‚26B：749 ［7］ Gupta D‚Lahiri A K．Water-modeling study of the surface dis￾turbances in continuous slab caster．Metall Mater Trans B‚1994‚ 25B：227 ［8］ Panaras G A‚Theodorakakos A‚Bergeles G．Numerical investiga￾tion of the free surface in a continuous steel casting mold model． Metall Mater Trans B‚1998‚29B：1117 ［9］ Teshima T‚Kubota J‚Suzuki M‚et al．Influence of casting con￾ditions on molten steel flow in continuous casting mold at high speed casting of slabs （in Japan）．Iron Steel‚1993‚79（5）：576 ［10］ Teshims T‚Osame M‚Okimoto K‚et al．Improvement of sur￾face property of steel at high casting speed∥Steelmaking Confer￾ence Proceedings．Warrendale：Iron and Steel Society‚1988：111 ［11］ Launder B E‚Spalding D B．The numerical computations of tur￾bulent flows．Comput Method Appl Mech Eng‚1973（3）：269 Calculation of F value and relationship between F value and slag entrapment in a slab continuous casting mold LU Qiaotong‚WA NG Xinhua‚Y U Huixiang‚ZHA NG Jiongming‚WA NG Wanjun Metallurgical and Ecological Engineering School‚University of Science and Technology Beijing‚Beijing100083‚China ABSTRACT To control slag entrapment‚a new method was put forward to calculate the level fluctuation in￾dex‚i．e．F value‚which was defined by other researchers．F value could easily be calculated based on the re￾sults of numerical simulation of slab continuous casting mold flow．The relationship between F value and level fluctuation in the mold as well as operational technological parameters were also studied．It is shown that using the data of numerical simulation of slab continuous casting mold flow can easily calculate F value．By adjusting operational technological parameters‚the range of F value can be controlled in3—5‚and the surface fluctuation in ±（3—5） mm‚as a result‚slag entrapment can be avoided． KEY WORDS slab continuous casting；mold；F value；mold powder entrapment 第8期 陆巧彤等： F 数计算及其与板坯连铸结晶器内钢水卷渣的关系 ·815·