Prediction and control of flow properties and cooling process for a hot strip on a runout table by water film
利用水膜预测和控制热轧带材在跳动台上的流动特性和冷却过程
基本信息
- 批准号:04452272
- 负责人:
- 金额:$ 2.5万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for General Scientific Research (B)
- 财政年份:1992
- 资助国家:日本
- 起止时间:1992 至 1993
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
For a hot rolling process of sheet steel, the finishing temperature of a hot strip is controlled to be kept beyong the A_3 critical point at the exit of the last finisher. Then, the hot strip passing through the last finisher is cooled on a runout table from the autenitic finishing temperatures in the range between 820゚C and 900゚ to the coiling temperatures between 500゚ and 700゚ according to the final strip thickness and steel grade. The investigation performed here is concerned with a predictable model for the temperature change of hot steel plates cooled by a laminar water flow. The results defined here are summarized as follows :First, it is indispensable to build up a predictable and reproducible numerical model for the flow field of the water film formed by the laminar water flow impinging on a horizonatal plate surface. In ordet to do so, first, the cold model which neglects the thermal effect has been adopted. The numerical model has been constructed using a system of the Navier … More Stokes equations governing the flow field of the water film on a plate surface. It has been confirmed that the flow field obtained by the model gives close agreement with experimental data.Next, the temperature rise of water film has been taken into account. When the temperature of the cooling water is kept low, the initially hot red plate begins to darken in the neighborhood of the water impinging point, as soon as the water impinges on the plate. As the cooling time elapses, the circular black zone expands. The visually observed fact is a positive proof of the occurence of the wetting phenomena. The numerical model has been made so that the effective forced water cooling zone can be determined by accounting for temperature change of the water film spreading on the hot plate. As the result of comparison of the numerical results obtained by the model with the experimental ones, a fairly good agreement has been found between the two, especially near the Leidenfrost temperature.Also, the predictable model for the estimation of the temperature change of a hot steel plate cooled by a laminar water curtain, which is horizontally moving at a certain velocity. Then, it has been confirmed that the numerical model proposed here is valid to the prediction of the cooling process of hot plate cooled by a laminar water curtain.In conclusion, we believe that the beforemensioned desired purpose of this research has been fulfillled for the most part. However, we think that are a number of problems which remains unsolved and will continue to promote the present investigation more deeply. Less
在热轧过程中,控制热轧带钢的终轧温度,使其在末道精轧机出口处保持在A_3临界点以上。然后,通过最后一个精轧机的热带钢在输出台上根据最终带钢厚度和钢种从820 ℃至900 ℃范围内的奥氏体精轧温度冷却至500 ℃至700 ℃范围内的卷取温度。这里进行的调查是关于一个可预测的模型,热钢板的层流冷却的温度变化。本文的主要研究结果如下:首先,建立一个可预测的、可重复的层流冲击水膜流场的数值模型是十分必要的。为此,首先采用了忽略热效应的冷态模型。数值模型已被构造使用的Navier系统 ...更多信息 平板表面水膜流场的Stokes方程。计算结果表明,该模型计算的流场与实验数据吻合较好。当冷却水的温度保持较低时,一旦水冲击板,最初热的红色板在水冲击点附近开始变暗。随着冷却时间的流逝,圆形黑色区域扩大。目视观察到的事实是润湿现象发生的积极证据。建立了数值模型,通过考虑热板上水膜的温度变化来确定有效的强制水冷区。通过与实验结果的比较,发现数值计算结果与实验结果吻合较好,特别是在莱顿弗罗斯特温度附近。同时,本文还提出了一种预测层流水幕冷却热钢板温度变化的预测模型。验证了本文所提出的数值模型对层流水幕冷却热板冷却过程的预测是有效的,基本达到了预期的研究目的。但是,我们认为,还有一些问题没有解决,并将继续推动目前的调查更深入。少
项目成果
期刊论文数量(28)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Hitoshi Fujimoto, Osamu Takahashi, Hirohiko Takuda, Hiroshi Maki and Natsuo Hatta: ""Flow Field of Annular Impinging Jet on Flat Plate"" Proceedings of the 5th International Symposium on Computational Fluid Dynamics. vol.1. 211-214 (1993)
Hitoshi Fujimoto、Osamu Takahashi、Hirohiko Takuda、Hiroshi Maki 和 Natsuo Hatta:“平板上环形冲击射流的流场”第五届国际计算流体动力学研讨会论文集。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
八田 夏夫: "水棒が平板に衝突して形成される水膜の流れ場" CAMP-ISIJ. 5. 506- (1992)
Natsuo Hatta:“水棒与平板碰撞时形成的水膜流场”CAMP-ISIJ。 5. 506- (1992)
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
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Hirohiko Takuda, Shiomi Kikuchi and Ntsuo Hatta: ""Modelling of Comprehensive Formula for Flow Curves of Aluminium Alloys at Elevated Temperatures"" Materials Transactions, JIM. vol.34. 711-717 (1993)
Hirohiko Takuda、Shiomi Kikuchi 和 Ntsuo Hatta:“铝合金高温流动曲线综合公式建模”《材料交易》,JIM。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
八田 夏夫: "平板上を流れる水膜流の膜厚に対する表面粗さの影響" CAMP-ISIJ. 5. 1545- (1992)
Natsuo Hatta:“表面粗糙度对流过平板的水膜厚度的影响”CAMP-ISIJ。5. 1545- (1992)
- DOI:
- 发表时间:
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- 影响因子:0
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HATTA Natsuo其他文献
HATTA Natsuo的其他文献
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{{ truncateString('HATTA Natsuo', 18)}}的其他基金
Deformation behavior of a liquid droplet impinging on hot metallic surfaces above the Leidenfrost temperature
莱顿弗罗斯特温度以上液滴撞击热金属表面的变形行为
- 批准号:
07455287 - 财政年份:1995
- 资助金额:
$ 2.5万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Prediction and control of powder entrapping at meniscus of molten steel in a continuous casting mold
连铸结晶器钢水弯月面夹粉预测与控制
- 批准号:
07555519 - 财政年份:1995
- 资助金额:
$ 2.5万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Development of optimum cooling systemn of water spraying for a high temperature metal
高温金属最佳喷水冷却系统的研制
- 批准号:
04555163 - 财政年份:1992
- 资助金额:
$ 2.5万 - 项目类别:
Grant-in-Aid for Developmental Scientific Research (B)
Capacity and Estimation on Liquid Spray Cooling on a Hot Surface of Just Solidified Steel Shell.
刚凝固钢壳热表面液体喷雾冷却的能力和估算。
- 批准号:
01550532 - 财政年份:1989
- 资助金额:
$ 2.5万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)