共查询到19条相似文献,搜索用时 312 毫秒
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以国内某钢厂6流八字型通道式感应加热中间包为研究对象,为了改善原型中间包的流场特性、降低温降、均匀各出水口温度,提出使用变径通道的方案并利用水模拟、数值模拟的方法对八字型感应加热中间包的流场及温度场进行研究,以此得到变径通道对中间包流场、温度场的优化效果。研究结果表明:原型中间包内流场分布不合理且温度差异明显,流往中间包中部的流股较少,中间包中部存在较大的低温区,各出水口温度分别为1 768、1 765.54、1 753.23 K;使用变径通道后,可以有效地改善流场的分布,增加了流向中间包中部的流股,提高了温度的均匀性,各出水口温差控制在3 K以内,温度分别为1 761.77、1 760.46、1 763.08 K。 相似文献
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根据衡阳钢管水平连铸中间包的实际情况,采用1:1.5的相似比例建立水模拟系统,对水平连铸中间包内钢液流场进行研究.得出水平连铸中间包内钢水流场与弧形连铸中间包内钢水流场的主要区别,提出了优化水平连铸中间包钢水流动的方向。 相似文献
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通过水模型实验,针对现场中间包流场存在的问题,对影响流场的关键因素进行正交优化试验并验证;本文主要在优化后最佳方案的基础上,对不同插入深度和湍流抑制器对中间包流场的影响进行研究,并研究了在非稳态浇注过程中,不同工况下中间包钢液最低液位的变化.试验结果表明:综合考虑RTD曲线和流场显示,保持中间包液面稳定,拉速为1.2m/min,在正交优化的最佳方案的情况下,采用圆形湍流抑制器,插入深度为90mm时,中间包内流场较好,死区比例小,平均停留时间长;非稳态浇注过程中采用有坝和圆形湍流抑制器的中间包时,钢液的最低液位比较合理. 相似文献
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A 1∶2.5 scale tundish model was set up in laboratory for a six-strand billet continuous casting tundish with different configurations to investigate fluid flow characteristics under different operational conditions by measuring residence time distribution curves.It was found that minimum residence time,maximum concentration time and average residence time of the three strands on the same side of the tundish with the former configuration under normal operation,that is,six strands were open,were small and non-uniform and the tundish had large dead volume fraction.Vortexes easily formed on the liquid surface in the pouring zone of the tundish.The fluid flow characteristics in the tundish with the optimal turbulence inhibitor and baffles were improved and became less non-uniform among the strands.Vortexes were not found on the pouring zone surface in the optimal tundish.For non-normal operation,that is,one strand was close,it was important to choose which strand to be closed for maintaining flow characteristics of the rest two strands.It was found from this investigation that fluid flow characteristics in the optimal configuration tundish with closing strand 2 were better than those with closing strand 3 on the same side. 相似文献
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A 1:2.5 scale tundish model was set up in laboratory for a six-strand billet continuous casting tundish with different configurations to investigate fluid flowing characteristics under different operational conditions by measuring residence time distribution curves. It was known from the investigation that minimum residence time, maximum concentration time and average residence time of the three strands in the same side of the tundish with the former configuration under normal operation, that is, 6 strands were open, were small and non-uniform and the tundish had large dead volume fraction. Vortexes easily formed on the liquid surface in the pouring zone of the tundish. The fluid flow characteristics in the tundish with the optimal turbulence inhibitor and baffles were improved and became less non-uniform among the strands. Vortexes were not found on the pouring zone surface in the optimal tundish. Under un-normal operation, that is, one strand was close, it was important to choose which strand should be closed for flowing characteristics of the rest two strands. It was found from this investigation that fluid flowing characteristics in the optimal configuration tundish with closing strand 2 were better than those with closing strand 3 at the same side. 相似文献
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为解决通道式感应加热7流中间包各流一致性差、第2和第6流钢水停留时间短的问题,通过水模拟试验对该中间包流场进行优化。等温试验结果表明,通过改变通道结构以及添加双挡坝可改善流体的流动状况。与原型结构相比,优化后中间包总体平均停留时间延长了277.8 s,死区比例降低了30.16%,各流一致性得到较大改善。非等温试验表明,感应加热引起的包内自然对流不可忽略,流体经加热从通道流出后会形成明显上升流。通道内外温差越大,中间包各流的一致性越好。针对原型方案,通道内外温差为5 ℃时,中间包内流体停留时间即较无温差时明显延长,死区基本消除。 相似文献