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Dual-mode scramjet control using optical emission sensors.
Applied Optics
|March 4, 2024
Summary
This study demonstrates closed-loop fueling control for dual-mode scramjets using only optical emission spectroscopy. This novel approach uses species emission intensity for precise fuel regulation in advanced propulsion systems.
Area of Science:
- Aerospace Engineering
- Combustion Science
- Spectroscopy
Background:
- Dual-mode scramjets are advanced propulsion systems requiring precise fuel control for efficient operation.
- Traditional sensors can be limited by harsh combustion environments.
- Optical emission spectroscopy offers a non-intrusive method for monitoring combustion processes.
Purpose of the Study:
- To demonstrate closed-loop fueling control of a dual-mode scramjet using optical emission spectroscopy (OES) as the sole feedback sensor.
- To identify optimal OES species pairs and imaging locations for sensitive fuel control.
- To evaluate the impact of optical window transmission on control performance.
Main Methods:
- Characterized optical emission from key species (OH*, CH*, C2*) within the scramjet combustor.
- Analyzed relative emission intensities between species pairs across various fueling conditions and locations.
- Implemented a control system utilizing the most sensitive species pair (C2*/OH*) and imaging location for feedback.
Main Results:
- Successfully demonstrated closed-loop fueling control of a dual-mode scramjet using only OES feedback.
- Identified the C2*/OH* emission pair and specific imaging locations as highly sensitive to fueling variations.
- Investigated and quantified the effects of optical transmission changes on the control system's effectiveness.
Conclusions:
- Optical emission spectroscopy is a viable and effective sole sensor for closed-loop fueling control in dual-mode scramjets.
- This research presents the first known demonstration of such a control system, paving the way for advanced scramjet operation.
- The findings highlight the potential of OES for robust and non-intrusive combustion monitoring and control in extreme environments.
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