Research On Surface Temperature Uniformity And Structure Optimization Of Water-cooled Plate For Metrology And Testing

With the development of industrial intelligence,the requirements for measurement accuracy have gradually increased,and the calibration of sensors is a prerequisite for accurate measurement.The end face temperature sensor commissioned by a certain shipbuilding industry unit requires a temperature measurement accuracy of ±0.5 ?,so the maximum temperature difference in the working area is required to be less than 0.5 ? in calibrating.The surface temperature verification furnace used in the past has the problem of temperature instability.Therefore,this paper proposes to use a water-cooled plate to construct a uniform temperature plane,which has good temperature stability,but the current water-cooled plate does not meet the temperature uniformity requirement.In order to analyze the factors affecting the temperature uniformity of the water-cooled plate and optimize it,this paper establishes a simulation model of the water-cooled plate.The simulation results show that the maximum surface temperature difference is 2.45 ?,which does not meet the requirements.In order to verify the reliability of the simulation model,an experimental test platform was built.The maximum absolute error of the experimental results and simulation results is 0.99 ?,and the relative error is 1.2%.The simulation model is effective.At the same time,the main factors affecting the uniformity of surface temperature distribution are the difference of inlet and outlet water temperature and the uneven distribution of internal flow.From the above conclusions,this paper firstly uses the external cover insulation layer to reduce the temperature difference between the inlet and outlet water temperature to improve the temperature uniformity.The simulation results show that the thicker the insulation layer is,the smaller the maximum temperature difference is,and when the thickness is 10 mm,the decrease of the maximum temperature difference on the surface tends to be stable.According to the simulation results,after covering 10 mm insulation layer,the maximum temperature difference of the surface of the water-cooled plate is 1.69 ?,which is reduced by 17.16%,which proves that the outer insulation layer is effective.However,the uniformity of the surface temperature at this time is still not up to standard,so it is proposed to change the internal structure to further improve the temperature uniformity.Simulation studies have found that changing the layout of the inlet and outlet and the structural parameters of the fins can improve the surface temperature uniformity.Then,based on the adaptive Kriging response surface,the structural optimization is carried out,and the water-cooled plates of the two types of inlet and outlet are optimized for single target.The results show that the optimized four-inlet water-cooled plates meet the temperature uniformity requirements.Besides satisfying the temperature uniformity,in order to further achieve higher surface temperature of the water-cooled plate,the structure of the four inlet water-cooled plates is optimized with the minimum surface temperature difference and the highest average temperature as the objective function.Comparing the single-objective optimization results,it is found that the multi-objective optimized water-cooled plate satisfies the temperature uniformity while the surface uniform temperature increases by 1.1 ?.The experimental verification of the multi-objective optimized water-cooled plate structure shows that the maximum temperature difference of the optimized water-cooled plate surface is 0.48 ?,which satisfies the requirements and validates the structural optimization method.