Mid-infrared Pulsed Upconversion Imaging in a Rotating Detonation Combustor
- University of Michigan, Ann Arbor; University of Michigan, Aerospace Engineering
- University of Michigan, Ann Arbor
To meet the challenges associated with performing mid-InfraRed (IR) imaging in Rotating Detonation Combustors (RDCs), a novel pulsed mid-IR UpConversion Imaging (UCI) diagnostic has been implemented. UCI is an alternative to direct mid-IR detection that uses nonlinear optical frequency mixing to shift mid-IR wavelengths carrying a target image to shorter wavelengths that can be imaged with high-performance silicon-based CCD/CMOS cameras. This approach offers several favorable properties including high spectral selectivity, high temporal resolution, and superior low-light detectivity. A hydrogen-air research RDC was operated with carbon dioxide addition to allow pulsed UCI imaging of mid-IR luminosity within the combustion channel from spontaneous thermal emissions. The resulting measurements demonstrate high spatiotemporal resolution capable of imaging small structures near the supersonically propagating detonation wave front. The results show how this technique can be used to observe sharp gradients and millimeter-scale structures in the high-temperature, high-pressure zones RDC flow fields.
- Research Organization:
- University of Michigan, Ann Arbor
- Sponsoring Organization:
- USDOE Office of Fossil Energy and Carbon Management (FECM)
- DOE Contract Number:
- FE0031228
- OSTI ID:
- 1995226
- Report Number(s):
- DOE-UMICH-FE0031228-008
- Journal Information:
- AIAA Scitech 2021 Forum, Journal Name: AIAA Scitech 2021 Forum
- Country of Publication:
- United States
- Language:
- English
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