Studies On Plasma-Propellant Interaction In Electrothermal-Chemical Launcher

Plasma-Propellant interactions in ETC are studied theoretically and experimentally.In theoretically Non-Fourier conduction heat transfer model is proposed, which is possible to appear in rapid transient heat transfer process due to the combustion behavior of solid-propellant by ignition with hot plasma gases.Analytical solution and numerical simulation of Non-Fourier conduction heat transfer model are summarized and commented on predecessors' results. The analytical solution of hyperbolic heat conduction model for a hollow sphere with inner and outer boundary surface subjected to sudden temperature rise is got by integral transforms. The temperature response and the temperature distribution to the model are also obtained. This result provides a theoretical basis for application in ETC with a Non-Fourier model as a constitutive equation.The Non-Fourier conduction heat transfer model is developed on conventional ignition theory for solid propellant. The analytical and numerical solutions are obtained for a cylinder solid propellant grain. The results show that the constitutive relation of the Non-Fourier model can reflect more real plasma-propellant interaction than conventional model.The experiments of the plasma ignition are performed. The results show that the influence for the solid propellant with plasma ignition include the short ignition delay time which associated with the type of the solid propellant, the hot flow of the plasma and the import of the electrical energy.The experiments describe the change of the ignition and combustion behaviors of different solid propellants by using a closed bomb coupled with a plasma generator. In comparison with conventional ignition, the combustion behavior, the sensitive to the plasma and the burning rate of the solid propellants are different due to the different type of the propellants.Non-Fourier thermal effect and thermal shock are studied to determine the physical mechanism of the plasma-propellant interaction. The exact solution with thermoelasticity show that the distribution of the dynamic thermoelastic stress in the hollow sphere cause the broken in solid propellant grain, which result in an increase in surface area and then augment the burning rate of the propellant gases.A new type Electreothermal-Chemical Light Gas Gun is introduced. Based on interior...