Penetration and Combustion Studies of Tandem Liquid Jets in Supersonic Crossflow

Abstract

The effect of Tandem-Hole configuration on penetration and combustion in supersonic crossflow was studied using three injectors having two tandem holes of 0.7 mm diameter with a spacing of 5, 10, and 14 mm. A Single-Hole injector with the same injection area was studied for comparison. Shadowgraph results in Mach 1.9, , flow condition with kerosene as injectant indicated that higher penetration was obtained for the Tandem-Hole injectors with spacing 10 and 14 mm compared to the Single-Hole injector. This higher penetration was due to the shielding provided by the upstream liquid jet for the downstream jet. The overall penetration increased as the spacing between the holes and the J ratio increased. Correlations were developed for the penetration of both types of injectors. Supersonic combustion studies in a strut-cavity-based combustor with inflow conditions of Mach 2, , showed that the performance of the Tandem-Hole injectors was superior. At higher equivalence ratios, the superior performance of the Tandem-Hole injector was enhanced. The estimated total pressure loss based on a one-dimensional model indicated that the effect of injector configuration was negligible, whereas the presence of a strut caused significant loss.