Simulation Study On Optimization Design Of Structural Parameters Of HAN-based Single Component Thruster

As a new generation of green,non-toxic and high-energy space thruster,HAN-based single component thruster has gradually become a research hotspot in recent years.However,there are some limitations to study the working process of HAN-based single component thruster by experiment.Therefore,the working process of HAN-based thruster by numerical simulation was studied,and the influence of key parameters on the working process of HAN-based thruster was explored.The working process of HAN-based thruster contains complex physical and chemical processes.In this paper,through the analysis of the working process of HAN-based thruster,the mathematical model of the working process of HAN-based thruster was established.Then,the working process of HAN-based thruster was simulated based on the established mathematical model.By comparing the simulation results with the experimental results,it’s found that the simulation results are in good agreement with the experimental results,which verifies the accuracy of the simulation model.Then,based on the simulation model,the HAN-based thruster was studied.Firstly,the working process of HAN-based thruster was analyzed.The start-up process of HAN-based thruster and the distribution of temperature,pressure,velocity and components in stable operation were analyzed.Based on these,the working state of HAN-based thruster in different stages was studied.Secondly,through the analysis of the pressure,temperature,velocity and component distribution in the thruster under different parameters,the effects of propellant inlet flow rate,catalytic bed porosity,catalytic bed length and catalytic bed diameter on the working process of HAN-based thruster were studied.Finally,the key structural parameters of HAN-based thruster were optimized based on BBD(Box-Behnken Design)response surface method.Through the BBD design method,the simulation calculation scheme was designed,and each sample point in the scheme was simulated to solve the thrust of the thruster under different structural parameters.Taking thrust as the optimization evaluation index,the response function of thrust on key structural parameters was obtained,and the optimal combination of structural parameters was obtained.The working process of the thruster before and after optimization was compared,which provides a reference for the optimization design.