Analysis of the Influence of Temperature Gradient on the Measurement Accuracy of Axial Force in Balance
As a measuring element in wind tunnel test,it is important to ensure the measurement accuracy of strain balance. However,in the continuous wind tunnel,due to the long running time of the wind tunnel and the continuous transformation of Mach number,the temperature distribution of the balance body will be uneven,resulting in temperature gradient. This temper-ature gradient has an obvious influence on the measurement accuracy of the axial force of the balance. In order to explore the influence of temperature gradient on the axial force and strain output of the balance in the continuous wind tunnel,three tem-perature loading conditions are summarized according to the actual working conditions,and the thermal-solid coupling analysis of the 80A balance is carried out by ANSYS Workbench. The results show that the higher the temperature of the base point of the temperature gradient,the faster the temperature input,the more uneven the temperature distribution of the balance,and the larger the temperature gradient,the larger the axial force and strain output. Considering the heat conduction of the back support rod,the temperature distribution of the balance body is relatively uniform,the temperature gradient is small,and the output of axial force and strain is small.
continuous wind tunneltemperature gradientstrain balancefinite element analysis
万方数据
维普
