| Related citation: | Yong Li,Jiadong Li,Xiong Ling,Zhaodong Wang,Tianliang Fu,Yi Han.Optimization and Aerodynamic Characteristics of New Air-Cushion Nozzle of Floating Furnace for Automobile Body Sheet[J].Journal of Harbin Institute Of Technology(New Series),2017,24(1):57-64.DOI:10.11916/j.issn.1005-9113.15218. |
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| Author Name | Affiliation | | Yong Li | State Key Lab of Rolling and Automation, Northeastern University, Shenyang 110819, China | | Jiadong Li | State Key Lab of Rolling and Automation, Northeastern University, Shenyang 110819, China | | Xiong Ling | State Key Lab of Rolling and Automation, Northeastern University, Shenyang 110819, China | | Zhaodong Wang | State Key Lab of Rolling and Automation, Northeastern University, Shenyang 110819, China | | Tianliang Fu | State Key Lab of Rolling and Automation, Northeastern University, Shenyang 110819, China | | Yi Han | State Key Lab of Rolling and Automation, Northeastern University, Shenyang 110819, China |
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| Abstract: |
| It is very important to develop new air-cushion nozzles so as to raise the heat treatment property of aluminum alloy automobile body sheet (ABS). A geometric model of air-cushion furnace equipment of ABS was built up and flow field was simulated by using k-ε turbulence equations of COMSOL Multi-physics. The influence and regularity of number (n), diameter (d) and arrangement of middle hole, and main control parameters of new air-cushion nozzle on aerodynamic characteristics and flow field were studied. The results show that: 1) with n increases, airflow vortexes in air-cushion area increase in multiple; d decreases or n increases, air cushion pressure (pc) becomes uniform; 2) average of pc is proportional to pressure in nozzle box (pt), when n increases, ratio of average of pc to pt increases, and when n≤3 and d≤b/2, they have little effect on ratio of pc average to pt; 3) when n is an even number, n≥4, and d≤b/2, pc shows good uniformity; when n is an odd number, the center hole affects pc uniformity greatly, and, when diameter of center hole is less than b/4 and diameter of non-center is between b/4 and b/2, pc has good uniformity. A new air-cushion jet model was presented, and the deviation of this new model with simulation data and experimental measured data are less than 7.75% and 7.76%, respectively. The present research is valuable for improving air-cushion stability, Al strip temperature homogeneity, and temperature control precision. |
| Key words: air-cushion nozzle aerodynamics air-cushion jet model floating furnace COMSOL |
| DOI：10.11916/j.issn.1005-9113.15218 |
| Clc Number:TG166 |
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| Descriptions in Chinese: |
| 铝合金汽车板气垫炉新型气垫喷嘴优化及气动特性研究 李勇，李家栋，梁雄，王昭东，付天亮，韩毅 （东北大学轧制技术及连轧自动化国家重点实验室） 创新点说明：(1)现有的气垫射流模型，只能用于仅有缝隙喷嘴的情况，且由于未考虑气体的附壁粘性损失，大大高估气垫压力。本文提出了新的气垫模型，新的气垫模型考虑了中间带多个孔的气垫喷嘴的情况。新气垫模型较好的揭示了铝带气垫炉的空气动力学特性，研究工作对提高气垫稳定性、温度均匀性及控温精度具有良好的价值。 (2)本文提出了新型气垫喷嘴，采用COMSOL Multiphysics软件进行了高精度的流场模拟，研究了新型气垫喷嘴中间孔的数量n、直径d、排布及气垫主要工艺控制参数对气垫喷嘴空气动力学和流场特性的影响规律。 研究目的： 为实现铝带的稳定漂浮和高均匀性热处理，研发新型气垫喷嘴对提高铝合金汽车板等高精铝合金产品的热处理性能非常重要。 研究方法： 本文建立了新型气垫喷嘴几何模型，采用COMSOL Multiphysics软件的k-ε湍流方程进行高精度的流场模拟，研究了新型气垫喷嘴中间孔的数量n、直径d、排布及气垫主要工艺控制参数对气垫喷嘴空气动力学和流场特性的影响规律，主要如下： 结果： 1）n增加，气垫区域内气流漩涡成倍数增加。 d减小和n增加，气垫压强pc变得均匀；2）  与  成正比关系，n增加，  /  增大，n≤3和 d<b/2时，n和d的变化对  /  影响不大；3）偶数孔时，n≥4，d≤b/2，pc均匀性好，  /  较高；奇数孔时，中心空对气垫的压强均匀性影响较大，中心孔直径dc≤b/4，pc均匀较好，非中心孔在b/4≤d≤b/2，气垫均匀性较好。现有的气垫射流模型，只能用于仅有缝隙喷嘴的情况，且由于未考虑气体的附壁粘性损失，大大高估气垫压力。本文提出了新的气垫模型，新模型与数值模拟值、大型气垫炉中试设备实测数据偏差分别小于7.75%， 7.76%。 结论： 研究工作对提高气垫稳定性、温度均匀性及控温精度具有良好的价值。 |
