反压下气液内混喷嘴动态仿真研究

The dynamic atomization characteristics of gas-liquid internally mixed injectors under backpressure conditions was investigated through numerical simulations, with a focus on the influences of different frequencies on the atomization field. A volume of fluid to discrete particle method (VOF-to-DPM) model combined with adaptive mesh refinement (AMR) was employed to simulate the atomization process of gas-liquid two-phase flow inside the injector. The results indicated that under certain backpressure conditions, excitations at the inlet can significantly improve the atomization performance. However, excessively high frequencies led to an increase in the diameter of some droplets, though the overall atomization effect remained superior to steady-state operation. Additionally, the spray cone angle increased with frequency variation, while the average Sauter mean diameter (SMD) exhibited periodic fluctuations-higher frequencies result in larger overall SMD values. Furthermore, increasing the frequency enhanced flow oscillation at the injector exit and introduced phase lag. This study could provide valuable insights for optimizing the dynamic characteristics of internally mixed injectors in liquid rocket engines.