Flow field study for head of lean premixed prevaporized low-emission combustor

The cold flow fields of a lean premixed prevaporized (LPP) low-emission combustor are studied by numerical simulation and experimental measurement. The LPP combustor is based on a multipoint lean direct injection (MLDI) and twin annular premixed swirler (TAPS). The influence of different pilot swirler angles on the cold flow field of the LPP combustor are measured by using particle image velocimetry (PIV). Different crosswise sections and lengthways sections are measured respectively. The cold flow field is also numerically studied by using software FLUENT. The experimental and numerical results are shown to be in good agreement, and the results demonstrate that the LPP combustor has a primary recirculation zone (PRZ), a corner recirculation zone (CRZ) and a lip recirculation zone (LRZ). Moreover, the radial and axial sizes of the primary recirculation zone enlarge with the increase of the pilot swirler angle.