驻涡燃烧室驻涡区涡系特点数值模拟

为深入了解驻涡燃烧室凹腔内流场的涡系分布特性,采用FLUENT对不同驻涡区前进口堵塞比和不同燃烧室入口速度的驻涡区流场进行计算,分析典型截面压力场和流线图,研究驻涡区涡系特点.结果表明:不同纵截面旋涡特点不同,主流被联焰板堵塞的凹腔纵截面只有主涡,为稳定点火和火焰稳定提供条件；不同横截面的旋涡差别较大,离驻涡区前壁越远的截面涡心距越大,贴近前壁和后壁的截面均无旋涡;燃烧室入口速度对轴向中间截面的旋涡结构无影响,而前进口堵塞比对旋涡结构影响较大.

Numerical Simulation on Characteristics of Vortex in Trapped Vortex Combustor

To investigate the distribution characteristics of the vortex in trapped vortex combustor cavity, FLUENT was used to perform numerical simulation on flow field of cavity with different blocking ratios of cavity front-inlet and different combustion inlet velocity. Pressure and steamline line of typical section was analyzed to research the characteristics of vortex in cavity. The result shows that the characteristics of vortex on different section are different, there only exist primary vortex on longitudinal section which mainstream was blockaded by shutter to help for the stability of ignition and flame stability. The differences of the vortex on different cross-sections are obvious. The distance between the vortex centers becomes larger as the distance to the front-wall increases. There is no vortex on cross-section which is close to front-wall and after-wall. The structure of the vortex on axial center section is not sensitive to combustor inlet velocity, but sensitive to blocking ratio of front-inlet.