Abstract
In order to study the unsteady evolution of the gas jet morphology and the multi-scale evolution of the vortex structure in the flow field, a high-precision numerical simulation method for gas jets in liquid-phase horizontal flow was established based on the two-step projection method and the VOF interface capture method, combining with the high-resolution mesh strategy. The results show that the evolution of the gas jet in the horizontal flow can be divided into three typical stages, including the initial formation of the jet bubble, the instability in the gas-liquid interface and the full development of the jet bubble. Induced by the Kelvin-Helmholtz instability, the gas-liquid interface deforms and gradually becomes unstable, resulting in the fracture of the jet flow, which gradually changes from large-scale continuous bubbles to small-scale discrete bubbles. The vortex system structure of the gas jet mainly consists of counter-rotating vortex pairs inside the jet and at the gas-liquid interface, shear-layer vortices near the wall and at the gas-liquid interface, and horseshoe vortices at the leading edge of the vent. Various vortex structures play different roles in different development stages of the flow field, and their interactions lead to complex multi-scale flows during the evolution of jet bubbles.
| Translated title of the contribution | Multi-Scale Vortex Structure Analysis of Gas Jets in Liquid-Phase Crossflow near the Flat Wall |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 942-949 |
| Number of pages | 8 |
| Journal | Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology |
| Volume | 43 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Sept 2023 |