采用三维网格和VOF(Volume of Fluids)多相流模型,对非轴对称、X型舵的航行体水下点火这一非稳态过程进行了三维流场数值模拟,捕捉了燃气泡的形成、发展及断裂过程,得到了航行体水下点火初期的流场变化和阻力变化,并进行了相关因素探讨和结果对比分析.研究表明,燃气泡的发展变化过程对航行体流场和阻力产生影响.该研究可为航行体水下点火设计及试验提供参考.%We use the three-dimensional grid and the VOF (volume of fluids) multiphase flow model to compute the three-dimensional flow field during the ignition of a non-axisymmetric autonomous underwater vehicle with X-type rudders. But the larger number of three-dimensional grids increases the computational time; in this regard, the determination of a reasonable number of grids and reasonable parameters can help obtain precise computational results. We use more than 1 500 000 grids, the FLUENT software and the VOF multiphase flow model to compute the unsteady flow of the autonomous underwater vehicle, thus obtaining the changes in drag, exhausted gas bubbles and flow field at the beginning of its ignition process. The computational results, given in Figs. 2 through 5, and their analysis show preliminarily that the changes in exhausted gas bubbles exert some impact on the drag and flow field of the autonomous underwater vehicle. The results of comparison of our computational results with the experimental results, some of which are done by ourselves and some are from literatures, show that they are in general agreement , indicating that the computation with our method is reliable.
展开▼
