共查询到20条相似文献,搜索用时 0 毫秒
1.
2.
Swirling flow tundish is a new kind of tundish which has shown good effects on flotation of inclusion and reduction of inclusion content. In this paper, studies have been carried out on the flow fields in a one‐strand slab tundish. A full scale model of the flow patterns in the water model tundish was developed using a self‐developed code. RTD curves under different experimental conditions were obtained from both physical and numerical simulations. The effects of the swirling flow chamber geometry and the flowrate on flow patters in the tundish were discussed and compared with results from the numerical simulation. Validation of the self‐developed codes was achieved by comparing the physical and numerical results of the RTD curves and the mean rotational velocities in swirling flow tundish. As a result, significant rotational flow in the swirling flow chamber and asymmetrical flow pattern in the whole tundish were confirmed and the effects of these parameters on dead zone and mean residence time were also obtained. Further and more comprehensive studies are needed to optimize the design and application of such tundishes. 相似文献
3.
应用计算机数值模拟研究了坝高、堰深、坝堰间距以及液面高度对中间包自由表面的影响,并通过水力学模拟验证数值计算结果的正确性。实验证明,计算机模拟的结果与水模实验结果基本相符,说明计算机模拟结果可以满足工程的需要。为优化设计中间包、减少卷渣的发生提供了有利的依据。 相似文献
4.
5.
The fluid flow in tundish is a non-isothermal process and the temperature variation of stream from teeming ladle dominates the fluid flow and thermal distribution in tundish. A numerical model was established to investigate the effect of inlet cooling rate on fluid flow and temperature distribution in tundish based on a FTSC (Flexible Thin Slab Casting) tundish. The inlet cooling rate varies from 0.5 to 0.25 ℃/min. Under the present calculation conditions, the following conclusions were made. When the stream temperature from teeming ladle drops seriously (for inlet cooling rate of 0.5 ℃/min), there is a “backward flow” at the coming end of casting. The horizontal flow along the free surface turns to flow along the bottom of tundish. The bottom flow shortens the fluid flow route in tundish and deteriorates the removal effect of nonmetallic inclusions from molten steel. Nevertheless, when the inlet cooling rate decreases to 0.25 ℃/min, the horizontal flow is sustained during the whole casting period. The present research provides theoretical directions for temperature control in teeming ladle and continuous casting tundish during production of advanced steels. 相似文献
6.
通过计算得出在浇注过程中连铸中间包包壁瞬态热量损失作为边界条件的基础上,建立了连铸中间包内钢液流动与传热耦合数学模型,对连浇过程中中间包内非稳态的温度场和流场进行了数值模拟,考察了中间包连浇5个包次过程中钢液热量损失、温度分布以及流场情况,为现场操作和工艺优化提供依据和指导。 相似文献
7.
8.
9.
《钢铁研究学报(英文版)》2011,(Z2):263-267
Original scheme and optimizing scheme of WISCO CSP tundish have been simulated by software FLUENT. Flow field and temperature field of different schemes have been analyzed. The results which have been proved by hydraulic model experiments are the same with that of numerical simulation. It shows that the dead volume Vd of optimizing scheme decreases to 11.37%, reduced by 67.8% compared with the original scheme. The average residence time Ta of optimizing scheme increases to 639.2s, increased by 172.5s compared with the original scheme. The optimized scheme favors homogenous temperature distribution, more reasonable flow field and inclusions removing in the tundish. It is more adaptive to CSP plant of WISCO compared with the original scheme. 相似文献
10.
11.
针对280 mm×350 mm五流连铸35 t中间包第3流铸坯质量探伤不合格率较高的问题,采用数值模拟和几何相似比1:3水模型模拟,研究了控流装置对中间包钢液流动特性的影响,优化中间包流场。结果表明,原型中间包控流装置结构不合理,各流一致性差,尤其第3流短路流明显;采用中墙开两孔的2~#挡墙+圆形加檐的B型湍流控制器后,各流一致性明显改善,第3流短路流消除,其平均停留时间延长了242.1 s,同时中间包活塞区体积增加了5.7%,死区体积减小了1.1%,冲击区钢液流动平稳。 相似文献
12.
13.
14.
15.
采用1:1的水模型研究了200 mm×1:300 mm立式板坯连铸结晶器内流场和在水口浸入深度115mm、拉坯速度0.55 m/min时水口结构参数(侧孔尺寸40 mm×40 mm~40 mm×80 mm,侧孔角度+15。~一15。)对液面波动的影响,基于流体力学计算,利用Fluent软件和采用κ-ε双方程高雷诺数湍流模型对板坯结晶器内的流场进行了三维数值模拟。结果表明,数值模拟结果与物理模拟结果较吻合;水口结构参数对液面湍动能的影响较明显;在1~#~4~#水口中,2~#水口(40 mm×40 mm,+15°,向下,倒Y形底部)的使用性能相对较好;流股的冲击速度越浅,自由液面湍动能越大。 相似文献
16.
17.
18.
19.
20.
针对三流非对称中间包,运用ANSYS Fluent软件对其控流方案进行模拟,比较不同方案下钢液的流场、温度分布和停留时间分布(RTD)特征。模拟结果显示:原方案中有明显的短路流出现,各个水口钢液的流动一致性差,3个水口的实际停留时间分别为459.44 s、519.43 s和636. 94 s,并且温度最大温差为7 K,死区比例为23.9%;最佳优化方案减少了短路流,钢液流动一致性提高,3个水口的实际停留时间分别为517.13 s、532.66 s和502. 12 s,死区比例降低到19. 8%,最大温差降低到2. 5 K,流动一致性良好,钢液流动更合理。工业试验以316L钢种为研究对象,中间包T[O]由49×10-6降至40×10-6,降幅为18. 4%,铸坯T[O]由34×10-6降至28×10-6,降幅为17. 7%,洁净度改善较为明显;中间包夹杂物数量密度由7. 2个/mm2降至4. 7个/mm2,铸坯由5.4个/mm2降至3. 5个/mm2,夹杂物数量降低。 相似文献