Abstract

In this study, numerical simulations of the interaction between supersonic crossflow and a side liquid jet were performed. The processes of the liquid jet breakup, flow separation and shock waves resulting from the interaction of the gas flows and liquid droplets were predicted. In the numerical simulation, a two-way coupling Eulerian-Lagrangian method was used. The two-dimensional unsteady compressible Navier-Stokes Equations were solved based on the MUSCL type (Monotone Upstream-Centred Scheme for Conservation Laws) spatial differencing coupling with Roe-type flux-difference splitting and a third-order accurate Runge-Kutta method for time-splitting. The atomization of liquid droplets was simulated using the combined KH-RT breakup model. The modified breakup model considered both the interface instability and the sudden deformation of a liquid spray induced by the compressible flows. Shock waves, recirculation zones and breakup processes of droplet particles were captured. The predicted droplet distributions at various operating conditions were discussed. Satisfied agreement between simulations and measurements is shown in the current work.

摘要

在这项研究中，进行了超声速横流和侧喷液相互作用的数值模拟。预测了由于气流和液滴相互作用而引起的液体射流破裂，流动分离和冲击波的过程。在数值模拟中，使用了双向耦合欧拉-拉格朗日方法。基于MUSCL型（单调守恒律为中心的守恒律）空间微分结合Roe型通量差分裂和三阶时间精确Runge-Kutta方法，求解了二维非定常可压缩Navier-Stokes方程。分裂。使用组合的KH-RT分解模型模拟液滴的雾化。修改后的破裂模型考虑了界面不稳定性和可压缩流引起的液体喷雾的突然变形。捕获了冲击波，回流区和液滴颗粒的破裂过程。讨论了各种工况下的预测液滴分布。当前的工作显示了仿真与测量之间的满意一致性。