In this study, the distribution of surface heat transfer induced by dual side-jets injected into a hypersonic flow has been visualized\nusing a temperature sensitive paint. The experiments were performed in both tandem and parallel injector arrangements, and\nthe spacing between the injection holes was taken as a parameter in each arrangement. As a result, the aerodynamic heating in\nthe separated region of the boundary layer and in the horseshoe vortex was clearly visualized. In the tandem arrangements, heat\ntransfer remarkably increased immediately upstreamof the front injector.Thedistributions and the intensity of surface heat transfer\nwere similar to those caused by the single injection. On the other hand, in the parallel arrangements, the extent of the separation\nnearly doubled, and the maximum heat flux decreased to less than half of that from the single injection. The global distribution\nof heat transfer varied significantly as the injector spacing was changed. When the injectors were positioned with a large spacing,\nthe interaction between the side-jets was relatively lowered, and thus distribution, as for the single injector, was induced around\neach injection hole individually. In contrast, with a short spacing, the dual injection behaved as a single obstacle.The most effective\nreduction of maximum heat flux was achieved with an intermediate injector spacing.
Loading....