Effect of Local Cooling Arrangement on Temperature Field of Aviation Aluminum Alloy Skin During Chemical Milling
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℃.
aviation aluminum alloy skinchemical millinglocal coolingtemperature fieldfinite element numerical simulation
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