Numerical simulation of thermal stress in the heat storage element of a hypersonic wind tunnel regenerative heater
In hypersonic wind tunnels,the use of regenerative heaters is one of the most advantageous ways to obtain high enthalpy pure incoming gas.Aiming at the problem of cracking and damage of regenerative heater in hypersonic wind tunnel during long-term operation,the ANSYS workbench software is used to numerically simulate the thermal stress field of the cracking phenomenon,and the formation mechanism and influencing factors of the crack are analyzed.The simulation and analysis results show that the main reason for the crack of the regenerator is the local high temperature thermal stress caused by the unreasonable opening layout of the regenerator.The cracking of the regenerative body is caused by fatigue fracture,and the maximum thermal stress exceeds its bending strength during long running.Through comparative analysis,the numerical simulation results are consistent with the actual damage of the accumulator,indicating that the numerical simulation results accurately reflect the cause of the crack of the accumulator in the regenerative heater.In addition,three suggestions are put forward on the improvement and optimization of the heat accumulator and the future research direction,which can provide reference for the engineering design and improvement of the heat accumulator in the hypersonic heat accumulator wind tunnel heater.
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