Abstract

Closed-loop fueling control was demonstrated using optical emission spectroscopy (OES) as feedback in a dual-mode scramjet (DMSJ). The chemiluminescence in the combustor of the DMSJ was first characterized for a variety of fueling conditions and detection locations. Electronically excited chemical species, OH∗, CH∗ and C∗2, were observed and used to control the amount of fuel injected into the DMSJ. Step and ramp functions were examined to determine the response of a controller using OES feedback in comparison to a controller using fuel pressure feedback. In addition, detection algorithms were developed for future inclusion in the OES Controller to enable faster response in a DMSJ. This work presents the first demonstration in open literature of closed-loop fuel control in a DMSJ using OES.

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