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首页> 外文期刊>ISIJ international >A DPIV study of liquid steel flow in a wide thin slab caster using four ports submerged entry nozzles
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A DPIV study of liquid steel flow in a wide thin slab caster using four ports submerged entry nozzles

机译：使用四个端口浸入式注口的DPIV研究宽板坯连铸机中钢水的流动

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摘要

Influence of SEN design and its depth below the meniscus on liquid steel flow inside a large width thin slab mold was studied using a 1:1 scale water model. Fluid flow characterization was performed through Digital Particle Image Velocimetry techniques, measurements of bath oscillations and tracer dispersion experiments. Two designs of SEN with four ports (two lateral ports with two bottom ports) were investigated. SEN-1 has a wider bottom base and SEN-2 has a narrow one. Both SEN's provide fluid flows in the mold with upper and lower recirculating flows. Jets emerging from the lateral and bottom ports do not overlap although the surface area of the lateral jet of SEN-1 works inefficiently as compared with that of SEN-2. SEN-1 promotes higher bath oscillations than SEN-2 because the lateral jets travel almost horizontally toward the narrow face. This enhances fluid velocities along the narrow wall until the bath surface. A recirculating flow is formed close to the SEN-1 in the upper bath surface that provokes also high bath oscillations. Design of SEN-2 avoids these flow defects yielding more stable fluid flows. Rising the SEN depths alters negatively the flow characteristics, although SEN-2 is better than SEN-1. Generally speaking both designs yield complex turbulent and unsteady flows and a better SEN design is suggested.
机译：采用1：1比例水模型研究了SEN设计及其在弯月面以下的深度对大宽度薄板坯模具内钢水流动的影响。通过数字粒子图像测速技术，液浴振荡测量和示踪剂分散实验进行流体流动表征。研究了具有四个端口（两个侧面端口和两个底部端口）的SEN的两种设计。 SEN-1的底基较宽，SEN-2的底基较窄。两种SEN都提供具有上下循环流的模具中的流体流。尽管SEN-1的侧向射流的表面积比SEN-2的效率低，但从侧向和底部端口流出的射流不会重叠。 SEN-1比SEN-2促进了更高的镀液振荡，因为侧向射流几乎水平地朝着狭窄的面传播。这提高了沿狭窄壁直到浴表面的流体速度。在上浴池表面靠近SEN-1处形成回流，这也会引起高浴池振荡。 SEN-2的设计避免了这些流动缺陷，从而产生了更稳定的流体流动。尽管SEN-2优于SEN-1，但增加SEN深度会对流量特性产生负面影响。一般来说，这两种设计都会产生复杂的湍流和不稳定流，因此建议采用更好的SEN设计。

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