双缝隙喷嘴射流冲击正弦形状带材过程压力系数的研究
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摘要
气垫炉广泛应用于铝带、铜带和硅钢的热处理过程,而双缝隙喷嘴是气垫炉装置的核心部件。研究悬浮带材表面的压力系数分布特性,可以为气垫炉的高效高值生产奠定重要理论依据。研究了Re=48 194～12 048、高度H/D=1～3、间距L/D=17.2和正弦幅值A=0～30 mm时,双缝隙喷嘴射流冲击正弦形状带材表面的压力系数分布规律。研究结果表明:雷诺数Re对压力系数C_p以及主驻点与第二驻点的压力系数差值影响并不明显;压力系数C_p随着H/D的增大而减小,而双缝隙喷嘴驻点处的压力系数与非驻点处的压力系数差值随着H/D的增大而增大。随着正弦幅值A的增大,主驻点位置逐渐向x/D=0移动;压力系数C_p随着正弦幅值A的增加而减小;随着L/D的减小,主驻点位置向喷嘴的几何中心线移动,第二驻点的压力系数逐渐增大。
Air cushion furnace is widely used in the heat treatment process of aluminum strip, copper strip and silicon steel, and the double slot nozzle is the core part of the air cushion furnace device. Studying the distribution characteristics of the surface pressure coefficient of the strip during the suspension process could provide important theoretical references for the high-efficiency and high-value production of the air-cushion furnace. In this paper, the distribution of pressure coefficients is studied under the conditions of Re= 48 194～12 048, high H/D=1～3, spacing L/D=17.2 and sinusoidal amplitude A=0～30 mm. The results show that with the decrease of L/D, the position of the main stop point moves to the center line of the nozzle, and the value of the second stop point increases gradually, and with the increase of the sinusoidal amplitude A, the position of the main stop point moves gradually to x/D=0. The pressure coefficient C_p decreases with the increase of sinusoidal amplitude A, the pressure coefficient C_p decreases with the increase of H/D, and the difference between the pressure coefficient at the stationary point of the double-slot nozzle and the pressure coefficient at the non-stationary point increases with the increase of H/D. This study provides an important theoretical basis for the design of double slot nozzles in air cushion furnace.
Air cushion furnace is widely used in the heat treatment process of aluminum strip, copper strip and silicon steel, and the double slot nozzle is the core part of the air cushion furnace device. Studying the distribution characteristics of the surface pressure coefficient of the strip during the suspension process could provide important theoretical references for the high-efficiency and high-value production of the air-cushion furnace. In this paper, the distribution of pressure coefficients is studied under the conditions of Re= 48 194～12 048, high H/D=1～3, spacing L/D=17.2 and sinusoidal amplitude A=0～30 mm. The results show that with the decrease of L/D, the position of the main stop point moves to the center line of the nozzle, and the value of the second stop point increases gradually, and with the increase of the sinusoidal amplitude A, the position of the main stop point moves gradually to x/D=0. The pressure coefficient C_p decreases with the increase of sinusoidal amplitude A, the pressure coefficient C_p decreases with the increase of H/D, and the difference between the pressure coefficient at the stationary point of the double-slot nozzle and the pressure coefficient at the non-stationary point increases with the increase of H/D. This study provides an important theoretical basis for the design of double slot nozzles in air cushion furnace.
引文
[1] WANG X,GUO M,CAO L,et al.Effect of Heating Rate on Mechanical Property,Microstructure and Texture Evolution of Al-Mg-Si-Cu Alloy during Solution Treatment[J].Materials Science & Engineering A,2015,621:8-17
[2] SHEN F,WANG B,YI D,et al.Effects of Heating Rate During Solid-Solution Treatment on Microstructure and Fatigue Properties of AA2524 T3 Al-Cu-Mg Sheet[J].Materials & Design,2016,104:116-125
[3] 侯帅,花福安,白梅娟,等.气垫炉漂浮技术研究综述[J].轻合金加工技术,2018,46(5):6-14HOU Shuai,HUA Fuan,BAI Meijuan,et al.Review of the Floating Technology of the Air Cushion Furnace[J].Light Alloy Fabrication Technology,2018,46(5):6-14 (in Chinese)
[4] 侯帅,白梅娟,花福安,等.大规格气垫炉试验平台机架的静态特性分析与设计[J].工业炉,2018,40(3):12-17HOU Shuai,BAI Meijuan,HUA Fuan,et al.Analysis and Design on Static Characteristics of Large-Scale Air-Cushion Furnace Test Platform[J].Industrial Furnace,2018,40(3):12-17 (in Chinese)
[5] MORETTI P M.Lateral Deflections of Webs in Air-Flotation Ovens[J].Journal of Applied Mechanics,2004,71(3):314-320
[6] RAMEZANPOUR A,MIRZAEE I,FIRTH D,et al.A Numerical Heat Transfer Study of Slot Jet Impinging on an Inclined Plate[J].International Journal of Numerical Methods for Heat & Fluid Flow,2007,17(7):661-676
[7] RAMEZANPOUR A,SHIRVANI H,MIRZAEE I.Heat Transfer Modelling of Slot Jet Impinging on an Inclined Plate[J].WIT Trans on Engineering Sciences,2004,46:485-494
[8] BAYDAR E,OZMEN Y.An Experimental Investigation on Flow Structures of Confined and Unconfined Impinging Air Jets[J].Heat & Mass Transfer,2006,42(4):338-346
[9] ABDEL-FATTAH A.Numerical and Experimental Study of Turbulent Impinging Twin-Jet Flow[J].Experimental Thermal & Fluid Science,2007,31(8):1061-1072
[10] 侯帅,李勇,王昭东,等.气垫炉圆形喷嘴漂浮力及传热研究[J].工业炉,2013,35(1):1-4HOU Shuai,LI Yong,WANG Zhaodong,et al.Study on Round Nozzle′ Floating Force and Heat Transfer Character of Air Cushion Furnace[J].Industrial Furnace,2013,35(1):1-4 (in Chinese)
[11] 侯帅,王超,王坤,等.气垫炉缝隙喷嘴传热特性研究[J].轻合金加工技术,2013,41(03):45-48HOU Shuai,WANG Chao,WANG Kun,et al.Study on Heat Transfer Character From Slot Nozzle of Air Cushion Furnace[J].Light Alloy Fabrication Technology,2013,41(03):45-48 (in Chinese)
[12] HOU S,HUA F,LYU W,et al.Hybrid Modeling of Flotation Height in Air Flotation Oven Based on Selective Bagging Ensemble Method[J].Mathematical Problems in Engineering,2013(3):1-9
[2] SHEN F,WANG B,YI D,et al.Effects of Heating Rate During Solid-Solution Treatment on Microstructure and Fatigue Properties of AA2524 T3 Al-Cu-Mg Sheet[J].Materials & Design,2016,104:116-125
[3] 侯帅,花福安,白梅娟,等.气垫炉漂浮技术研究综述[J].轻合金加工技术,2018,46(5):6-14HOU Shuai,HUA Fuan,BAI Meijuan,et al.Review of the Floating Technology of the Air Cushion Furnace[J].Light Alloy Fabrication Technology,2018,46(5):6-14 (in Chinese)
[4] 侯帅,白梅娟,花福安,等.大规格气垫炉试验平台机架的静态特性分析与设计[J].工业炉,2018,40(3):12-17HOU Shuai,BAI Meijuan,HUA Fuan,et al.Analysis and Design on Static Characteristics of Large-Scale Air-Cushion Furnace Test Platform[J].Industrial Furnace,2018,40(3):12-17 (in Chinese)
[5] MORETTI P M.Lateral Deflections of Webs in Air-Flotation Ovens[J].Journal of Applied Mechanics,2004,71(3):314-320
[6] RAMEZANPOUR A,MIRZAEE I,FIRTH D,et al.A Numerical Heat Transfer Study of Slot Jet Impinging on an Inclined Plate[J].International Journal of Numerical Methods for Heat & Fluid Flow,2007,17(7):661-676
[7] RAMEZANPOUR A,SHIRVANI H,MIRZAEE I.Heat Transfer Modelling of Slot Jet Impinging on an Inclined Plate[J].WIT Trans on Engineering Sciences,2004,46:485-494
[8] BAYDAR E,OZMEN Y.An Experimental Investigation on Flow Structures of Confined and Unconfined Impinging Air Jets[J].Heat & Mass Transfer,2006,42(4):338-346
[9] ABDEL-FATTAH A.Numerical and Experimental Study of Turbulent Impinging Twin-Jet Flow[J].Experimental Thermal & Fluid Science,2007,31(8):1061-1072
[10] 侯帅,李勇,王昭东,等.气垫炉圆形喷嘴漂浮力及传热研究[J].工业炉,2013,35(1):1-4HOU Shuai,LI Yong,WANG Zhaodong,et al.Study on Round Nozzle′ Floating Force and Heat Transfer Character of Air Cushion Furnace[J].Industrial Furnace,2013,35(1):1-4 (in Chinese)
[11] 侯帅,王超,王坤,等.气垫炉缝隙喷嘴传热特性研究[J].轻合金加工技术,2013,41(03):45-48HOU Shuai,WANG Chao,WANG Kun,et al.Study on Heat Transfer Character From Slot Nozzle of Air Cushion Furnace[J].Light Alloy Fabrication Technology,2013,41(03):45-48 (in Chinese)
[12] HOU S,HUA F,LYU W,et al.Hybrid Modeling of Flotation Height in Air Flotation Oven Based on Selective Bagging Ensemble Method[J].Mathematical Problems in Engineering,2013(3):1-9