Modeling and Experimental Study on the Ignition Process of Regenerative Liquid Propellant Mortar
The ignition performance of regenerative liquid propellant mortars has an important influe-nce on the internal ballistic performance and the combustion stability of liquid propellant.For the igni-tion process,a semi-closed bomb for regenerative-spray combustion was designed,and the pressure change of the combustion chamber was measured.On the basis of experiments,a calculation model for the ignition of regenerative liquid propellant mortars was established,and the flow field changes in the combustion chamber were numerical simulated.The results show that the numerical simulation is in good agreement with experimental results and reflects the changes of important physical parameters such as combustion chamber pressure during the ignition process.The flow of base charge gas produces significant vortex effect,and the gas has strong impact disturbance on the injection piston,liquid pro-pellant jet and atomization combustion.The pressure at the end face and nozzle of the injection piston is oscillatory,and the main frequency of pressure oscillation is about 5.2 kHz.The established ignition calculation model can provide reference for subsequent ignition research and design.
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