Thermal Insulation Aluminum Honeycomb Panels And Numerical Simulation Study Of Thermal Coupling

The aluminium alloy honeycomb panel is consisted of top and bottom face plate and middle honeycomb.because of its high specific strength,heat insulation,sound insulation and corrosion resistant,it has been widely used in the area of transportation,construction, energy,etc.In this paper,the aluminium alloy honeycomb panel researched is made by braze welding method.At present,the aluminium alloy honeycomb panel is used as sructure material.So,large work was devoted into the investigation on the mechanical properties of honeycomb panel by domestic and foreign scholars. However,the published research on the properties of heat insulation,sound insulation,etc is quite lacked.In this paper,the ANSYS finite elemet method was used to investigate the properties of heat insulation and thermo-mechanical coupling of aluminium alloy honeycomb pane.The content and conclusions are as follow(l)The heat transfer model of honeycomb panel was built which was used to simulate the transient surface thermal response of nickelbase superalloys honeycomb panel,the results indicate that the simulated results are quite consistent with experimental results and the heat transfer model is reliable, and the ANSYS finite element method can be applied to simulate the heat transfer of honeycomb panel.(2)physical properties of3003aluminium alloys were aquired by employing laser flash apparatus,and then the heat insulation property was simulated by ANSYS finite element method.By carrying numerical simulation on the thermal conductivity of aluminium alloy honeycomb panel,it is known that the max relative error between simulated results and calculated results of Swann&pittman semi-empirical formula is4.26%,which shows the simulated results are reliable.Furthermore,by the simulated results of thermal conductivity,it is also known that the thermal conductivity of aluminium alloy honeycomb panel is far smaller than that of aluminium alloy. By investigating transient surface thermal response of aluminium alloy honeycomb panel,the conclusion can be draw that the relationship between lower surface temperature and time shows exponential when upper surface temperature is constant and temperature lag of lower surface and the max value of temperature difference between upper and lower surface relate with the rate of temperature change of upper surface,namely,the bigger the rate of temperature change of upper surface is,the more serious the temperature lag of lower surface is and the larger the max value of temperature difference between upper and lower surface is.The temperature shows linear distribution along thickness-direction when the heat transmission of aluminium alloy honeycomb panel reachs steady state.(3)The single variable method and orthogonal test were adopted to investigate the effects of parameters of aluminium alloy honeycomb panel on the perfermace of heat insulation. The results of study demonstrate that the thermal conductivity of aluminium alloy honeycomb decreases with the height of core and side length of honeycomb unit increasing,but the thermal conductivity of aluminium alloy honeycomb inreases with the thickness of core, upper and lower panel and the emissivity of inner surface increasing.Through orthogonal test,the order of range for all factors is Rt>Rl>Rt2>Rtl>Rε>Rhc.The range of each factor increases in various degrees with the upper surface temperature increasing,but the order is unchanged.In addition,the range of thickness of core and range of side length of honeycomb unit are far bigger than that of other factors.(4)the temperature distortion and thermal stress of aluminium alloy honeycomb panel under various upper surface temperature and constraint condition,which were compared with simulated results of same-sized aluminium alloy entity,were simulated by using ANSYS finite element method. The conclusion can be draw that the degree of temperature distorsion and thermal stress of aluminium alloy honeycomb panel increase with the upper surface temperature increasing and distribution of temperature distorsion and thermal stress of aluminium alloy honeycomb is symmetrical.Under the same upper surface temperature and constraint condition, the max plastic deformation and max thermal stress of aluminium alloy honeycomb panel are lower than that of aluminium alloy entity,the property of resisting failure and plastic deformation of aluminium alloy honeycomb panel is more fine that of aluminium alloy entity.