Numerical investigation of two-phase reactive flow with two moving boundaries in a two-stage combustion system

摘要

The quest to achieve higher muzzle velocity is one of the key goals for researchers in the fields of propulsion al ballistic. Based on the conventional chemical propulsion, the two-stage combustion system as a new laun, principle can provide higher muzzle velocity without exceeding the maximum pressure in the chamber. In tt paper, the modified two-fluid model with two moving boundaries is proposed to simulate the detailed mul dimensional flow and energy conversion behaviors of the combustion gas and propellant grains in the two-sta; chamber. The dynamic self-adapting mesh update method is developed to expand and merge the computation domain for both projectile and piston motions. The application to a standard virtual gun as a standard benc mark for interior ballistic codes is used to validate the accuracy and reliability. The calculation results are good agreement with those of codes in different countries. After that, a two-stage chamber system is set up bas, on the standard virtual gun. The numerical results present deep understanding of the two-phase flow behavic in the two-stage chamber. Then the effects of design parameters on the performances in the additional chamb are numerically investigated. Finally, a suggested scheme of the additional chamber is proposed. The findings the study put a further prediction tool for the understanding and design of the two-stage combustion system wi moving boundaries.