Experimental Study on Electronic Control Combustion Characteristics of Hydroxylamine-nitrate-based Solid Propellant
Hydroxylamine nitrate-based solid propellant,comprising hydroxylamine nitrate(HAN)as the oxidising agent and polyvinyl alcohol(PVA)as the binder,displays the following characteristics:electrically controllable combustion,non-toxicity of the gas production,and good energy characteristics.However,its unstable working performance and unclear ignition mechanism represent significant limitations to its engineering practical application.Facing those questions,a series of propellants with varying composition ratios are prepared and analysed.The microscopic morphology,elemental distribution and conductivity of the propellants are investigated using a scanning electron microscope spectrometer and electrochemical workstation.Subsequently,the ignition power,propellant temperature,flame structure and extinguishing characteristics of the propellants are experimentally investigated,and the optimal composition ratios are identified.The experimental results demonstrate that an increase in the PVA content of the propellant leads to a more compact skeleton structure formed by crosslinking of PVA molecular chains.This,in turn,results in a reduction in the conductivity of the propellant,an increase in the ignition power required,and a higher surface temperature.During combustion,the propellant undergoes a process of self-decomposition,which is not conducive to efficient combustion and repetitive ignition.The optimal mass fraction of PVA is 18%.In addition,electrochemical impedance represents a crucial factor influencing the injection of propellant electrical energy.A PVA content that is too low will impede the injection of electrical energy,preventing the propellant surface from reaching the ignition temperature.
Solid propellantHydroxylamine nitrateFormulation optimizationElectronically controlled combustionIgnition and combustion characteristics
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