分离螺母多种火药燃烧模型及影响因素

To accurately predict the separation behaviors of the motive components of an indirect-thrust split nut and the pressure change in the combustion chamber, a mathematical model is established while considering multi-pyrotechnic charges, multi-stage motion equations of the motive components, O-ring friction, and heat loss. Compared with the experimental results, the time history of pressure is predicted with high agreement by the model. If the heat loss and O-ring friction are not considered, the predicted peak pressure and peak velocity of the inner sleeve are overpredicted by 33% and 47%, respectively. The effects of the pyrotechnic charge mass on separation behaviors are investigated using the established model. Increasing the mass of the propellant case and reducing the mass of aluminum potassium perchlorate could effectively improve the reliability of separation and reduce shock.