局部冷却布置对航空铝合金蒙皮化铣温度场的影响研究
Effect of Local Cooling Arrangement on Temperature Field of Aviation Aluminum Alloy Skin During Chemical Milling
黄梅 1吴宁 2李旭勇 2张东升 2李丰 2潘龙腾 2邹康鑫 1欧阳德来 1崔霞1
作者信息
- 1. 南昌航空大学 材料科学与工程学院,南昌 330063
- 2. 江西洪都航空工业集团有限责任公司,南昌 330096
- 折叠
摘要
为优化某航空铝合金蒙皮化铣过程中局部冷却布置,利用Fluent软件对局部冷却时蒙皮化铣温度场进行有限元数值模拟,研究局部冷却布置对航空铝合金蒙皮化铣温度场的影响.结果表明:随化铣时间增加,蒙皮表面温度增加,且存在较大温度差,化铣 760 s后温度差超过 4℃;单冷却喷口局部冷却效果较差,底部化铣面冷却不足;下方加装一个喷口会改善底部化铣面冷却效果;上方加装一个喷口使化铣面右上部分高温区域消失,能够明显改善化铣面温度均匀性;但过多冷却喷口(5喷口)会使冷却液相互干扰,化铣面温度均匀性变差.喷口流速低于 2 m/s时,化铣面降温速度较慢;高于 3 m/s时,化铣面降温速度较快,但温度均匀性变差.从冷却效果考虑,采用纵向三冷却喷口布置、喷口流速 3 m/s的方案最佳,此时化铣面最低温度冷却至85℃所需时间为51 s,化铣面最高温度为89.3℃,平均温度为87.5℃.
Abstract
To optimize the local cooling setup in the skin chemical milling process of an aviation aluminum alloy,finite element numerical simulation of the temperature field of skin chemical milling with local cooling was carried out using Fluent software.The impact of local cooling setup on the temperature field of aviation aluminum alloy skin chemical milling was investigated.The results show that as the chemical milling time progresses,the surface temperature of the skin rises,and there is a substantial temperature difference,which exceeds 4℃after 760 s of chemical milling.The local cooling effect of the single cooling nozzle is poor.And an inadequate cooling at the bottom of chemical milling surface is detectable while installing a nozzle at the bottom will improve the cooling effect at this region.Similarly,incorporating a nozzle at the top can eliminate the high temperature zone in the upper right part of the chemical milling surface,which significantly improves the temperature uniformity along the chemical milling surface.However,too many cooling nozzles(5 nozzles)lead to coolant interfere and a decayed temperature uniformity of the chemical milling surface.When the flow rate of the nozzle is lower than 2 m/s,the surface cooling speed is slow.Conversely,when exceeding 3 m/s,the surface cooling speed is fast,but the temperature uniformity tends to be inferior.Considering the cooling effect,a configuration with longitudinal three-cooling nozzles and a nozzle flow rate of 3 m/s is recommended.Under these conditions,cooling to the minimum temperature of 85℃takes 51 s,with the maximum temperature of chemical milling surface is 89.3℃and the average temperature is 87.5℃.
关键词
航空铝合金蒙皮/化铣/局部冷却/温度场/有限元模拟Key words
aviation aluminum alloy skin/chemical milling/local cooling/temperature field/finite element numerical simulation引用本文复制引用
基金项目
国家自然科学基金(51864035)
江西省自然科学基金(20224BAB204013)
出版年
2024
NETL
NSTL
万方数据