钢轨热处理喷风冷却超音速仿形喷嘴设计及仿真

doi:10.13251/j.issn.0254-6051.2024.03.047

金属热处理 ›› 2024, Vol. 49 ›› Issue (3): 286-292.DOI: 10.13251/j.issn.0254-6051.2024.03.047

钢轨热处理喷风冷却超音速仿形喷嘴设计及仿真

高明昕^1,2, 徐林聪¹, 汪洋¹, 杨建¹, 宋华¹

1.辽宁科技大学机械工程与自动化学院, 辽宁鞍山 114051;
2.辽宁科技大学材料与冶金学院, 辽宁鞍山 114051

收稿日期:2023-09-24 修回日期:2024-01-24 出版日期:2024-03-25 发布日期:2024-04-24
通讯作者: 宋华,教授,博士,E-mail:songhua88@126.com
作者简介:高明昕(1985—),男,副教授,博士,主要研究方向为金属材料热处理强化工艺及机理,E-mail:gaoming31@163.com。
基金资助:
辽宁省教育厅高校基本科研项目-面上项目(JYTMS20230951)

Design and simulation of supersonic profiling nozzle for rail heat treatment

Gao Mingxin^1,2, Xu Lincong¹, Wang Yang¹, Yang Jian¹, Song Hua¹

1. School of Mechanical Engineering and Automation, University of Science and Technology Liaoning, Anshan Liaoning 114051, China;
2. School of Material and Metallurgy, University of Science and Technology Liaoning, Anshan Liaoning 114051, China

Received:2023-09-24 Revised:2024-01-24 Online:2024-03-25 Published:2024-04-24

摘要/Abstract

摘要： 针对钢轨风冷淬火技术存在的冷却能力弱和冷却均匀性差的突出问题,设计了超音速仿形喷嘴(SP喷嘴),通过超音速射流提高冷却能力,通过对钢轨轨头结构的仿形提高冷却均匀性。使用数值仿真结合试验研究了SP喷嘴对钢轨换热特性的影响。结果表明,SP喷嘴较现有的圆形常速喷嘴、圆形超音速喷嘴和常速仿形喷嘴的冷却能力分别提高了54.22%、13.88%和47.01%,冷却均匀性分别提高了31.11%、31.11%和6.06%。生产时,调节SP喷嘴入口压力,使高温钢轨在冷却至相变结束温度之前(约500 ℃)以接近但不大于其珠光体转变临界冷却速率的速率进行冷却,之后尽可能增大喷嘴入口压力,有利于在保证钢轨热处理性能的前提下提高生产效率。

关键词: U75V钢轨, 热处理, 超音速仿形喷嘴, 换热特性, 数值仿真

Abstract: In view of the prominent problems of poor cooling capacity and uniformity of the rail air-quenching technology, supersonic profiling nozzle (SP nozzle) was designed to improve the cooling capacity through supersonic jet and improve the cooling uniformity through the profiling structure of the rail head, and then the effect of heat transfer characteristics of SP nozzle on the rail was studied by using the numerical simulation combined with experiments. The results show that the cooling capacity of the SP nozzle is 54.22%, 13.88% and 47.01% higher, and the cooling uniformity is 31.11%, 31.11% and 6.06% higher than that of the existing circular constant velocity nozzle, circular supersonic nozzle and constant velocity profiling nozzle, respectively. In the production, the following measures are beneficial for improving production efficiency while ensuring the performance of the rail: adjusting the inlet pressure of the SP nozzle to cool the rail at a rate close to but not greater than the critical cooling rate of the pearlite transformation before cooling to the end temperature of phase transformation (about 500 ℃), and then increasing the inlet pressure as much as possible.

Key words: U75V steel rail, heat treatment, supersonic profiling nozzle, heat transfer characteristics, numerical simulation

中图分类号:

TB552
TH122

高明昕, 徐林聪, 汪洋, 杨建, 宋华. 钢轨热处理喷风冷却超音速仿形喷嘴设计及仿真[J]. 金属热处理, 2024, 49(3): 286-292.

Gao Mingxin, Xu Lincong, Wang Yang, Yang Jian, Song Hua. Design and simulation of supersonic profiling nozzle for rail heat treatment[J]. Heat Treatment of Metals, 2024, 49(3): 286-292.

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钢轨热处理喷风冷却超音速仿形喷嘴设计及仿真

Design and simulation of supersonic profiling nozzle for rail heat treatment

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