Simulation Of Work Process And Optimization Design Of Structure Parameters Of ADN Thruster

With the higher requirements of environmental protection of space industry to people, the hydrazine propellant based liquid thruster which is carcinogenic and corrosive that has been used for more than50years already cannot satisfy the demand of the modern space industry. A kind of ADN thruster using nontoxic ADN base propellant gets more and more attention of people. The toxicity of ADN thruster is far lower than the hydrazine propeller, while the density specific impulse is far larger than the hydrazine thruster. And the ADN thruster do not produce the combustible smoke, so the ADN thruster has the very high application prospect. Because of the complexity of the physical and chemical process occurred in the ADN thruster, involving flow, heat transfer, catalytic decomposition, combustion reaction, and many other subprocesses and strong coupling relationship between them, it is necessary to research the work process of ADN thruster in depth. The work process in ADN thruster is studied in this article on the simulation calculation method.The flow, heat transfer, catalytic decomposition and combustion reaction occurred in the ADN thruster are mathematical described, and the mathematical model of work process in ADN thruster is set up. The simulation calculation of the catalytic decomposition and combustion process is carried out based on a ADN thruster and the performance of the ADN thruster is predicted. And the combustion temperature and pressure is got which shows great agreement with the experiment date, and verify the accuracy of the simulation calculation. Furthermore, the work process in ADN thruster is deeply analyzed.At the beginning, the effects of inlet mess flow rate, catalyst bed preheating temperature and porosity of porous media on the catalytic decomposition and combustion process and on the thruster performance are studied. Then the catalytic bed length and diameter, and combustion chamber length of ADN thruster are optimized based on the Orthogonal Experiment Method. The effects of the geometrical parameters mentioned above on thrust are qualitative and quantitative analyzed by using intuitionist analysis and square-difference analysis, and the influence law on the performance of the thruster is revealed. Through these methods, the optimal parameters combination is got. By comparing the differences of work process between the optimized ADN thruster and the original ADN thruster, the referential basis for the optimization design of ADN thrusters is provided.