Enhancing the fuel-air mixing is critical for scramjet combustor performance. The performance of dual-hole injector was reported in this paper. The experiments were conducted in a direct-connected scramjet test facility. The concentration profiles were obtained by gas sampling and chromatogram analysis. The pictures of the flow field were obtained by using laser scatter. For injection with dual-hole, the flow patterns were controlled by the distances between the holes, which would affect the global property of the mixing. Both experiments and numerical simulation showed that the advisable distance between the holes was 5D~6D, which would create an advantageous influence to make a better mixing performance.
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