支板一体化稳定器回流区液雾卷吸特性实验研究

In order to investigate the liquid spray entrainment distribution characteristics of the recircula⁃ tion zone in different trailing edge configurations of the afterburner integrated strut flameholders，eight configura⁃ tions with expansion structures（labeled A~I）were designed. Experiments were conducted under various operat⁃ ing conditions，including ambient temperature and pressure，as well as medium temperature and pressure （500 K & 0.3 MPa），with fuel injection angles of 90° and 130°，and trailing edge heights of 30，35，and 40 mm. The results show significant differences in liquid spray entrainment patterns within the recirculation zones among different trailing edge configurations. Compared with the purely straight strut structure，increasing the trailing edge height helps improve recirculation entrainment，and reverse injection results in a larger longitudinal distri⁃ bution range behind the trailing edge. Under medium temperature and pressure conditions，the small droplets generated during the breakup and atomization of the jet in the straight strut evaporate quickly. The time-averaged contour images reveal fuel break-up，which could lead to discontinuous combustion. In the lobe-shaped G config⁃ uration，the narrow gap causes gas to entrain the liquid spray，and this phenomenon should be considered when designing the location of the igniter. Additionally，the comparison of the recirculation zone’s time-averaged vor⁃ tex flow field and liquid spray distribution at the same freestream Mach number for the nozzle-to-trailing edge distance used in the study shows large differences，which may be due to the poor followability of the larger-sized droplets from the lateral jet atomization.