喷管中泡状气液两相流影响因素分析

Analysis of factors impacting bubbly flows through converging-diverging nozzle

关键词:  缩放喷管  泡状流  数值仿真

Key words:  Converging-diverging nozzle  Bubble flow  Numerical simulation

摘要:

为了获得边界条件对缩放喷管中泡状流的影响,采用包含气泡动力学的连续均质混合流模型,基于求解Rayleigh-Plesset方程的变步长龙格-库塔方法,提出一种稳态泡状流求解的迭代修正计算方法,实现了喷管中流场计算。获得了气泡半径、混合密度在喷管中变化情况。将不同边界条件下的计算结果进行对比分析,得到了气泡平衡半径、喷管入口含气率及入口速度对流动的影响。

Abstract:

To investigate the impact of boundary conditions to the bubbly flows through a converging-diverging nozzle,an iterative correction algorithm was developed for solving the steady bubbly flows with the homogeneous continuum bubbly mixture model,based on the variable step Runge-Kutta scheme for Rayleigh-Plesset equation.The flow field through the nozzle was simulated subsequently,and variations of spherical bubbles radius and mixture density in the nozzle were obtained.Moreover a series of computations have been performed with different boundary conditions and consequently obtained the influence of bubble reference radius,the nozzle inlet velocity,the initial volume void fraction to the flow field with the computation results.