Numerical simulation and test of AlN ceramic jet vane
To solve the lightweight problem of rocket jet vanes,a new jet vane based on high thermal conductivity aluminum nitride(AlN)ceramic was designed.In order to investigate its feasibility,the unsteady numerical simulation method based on fluid-solid thermal coupling was established to research the working process of aluminum nitride ceramics jet vanes under different angles,and their thermal shock resistance was analyzed based on the ceramic strength prediction model in high temperature environment.AlN ceramic jet vanes were processed for the ground static jet test of solid rocket motor at different angles,and the test results were analyzed by SEM.The research showed that,the numerical simulation results were basically consistent with the test results,which verified the effectiveness of the numerical simulation method.For the solid rocket motor with the total temperature of 2 284 K,AlN ceramic jet vanes can withstand the maximum mechanical shock and thermal shock caused by the engine gas in 1 s.AlN ceramic had much better high thermal conductivity(320 W/(m·K)theoretical)and thermal shock resistance than other structural ceramics.AlN ceramic is a good alternative material for small jet vane.
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