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Toward in-cylinder absorption tomography in a production engine.
Paul Wright1, Charles A Garcia-Stewart, Stephen J Carey
1School of Electrical and Electronic Engineering, University of Manchester, Manchester M60 1QD, UK.
Applied Optics
|November 8, 2005
Summary
This study details design requirements for a high-speed chemical species tomography system to image hydrocarbon vapors in an automobile engine cylinder. Novel reconstruction techniques and initial IR absorption measurements show promise for engine combustion analysis.
Area of Science:
- Optical Engineering
- Combustion Science
- Chemical Imaging
Background:
- Understanding in-cylinder fuel-air mixing and combustion is crucial for optimizing engine efficiency and reducing emissions.
- Current diagnostic techniques often lack the spatial and temporal resolution to capture transient chemical species dynamics within an engine cylinder.
Purpose of the Study:
- To examine the design requirements for an 8000 frame/s dual-wavelength ratiometric chemical species tomography system for hydrocarbon vapor imaging.
- To present novel image reconstruction techniques and discuss implementation progress for in-cylinder engine applications.
Main Methods:
- Spectroscopic measurements on iso-octane.
- Utilizing laboratory phantoms and research engines for performance evaluation.
- Developing and presenting novel image reconstruction algorithms for tomography.
- Performing cross-cylinder infrared (IR) absorption measurements.
Main Results:
- Design requirements for an 8000 frame/s dual-wavelength ratiometric chemical species tomography system were established.
- Temporal resolution performance was assessed using research engines.
- Initial cross-cylinder IR absorption measurements were successfully obtained from a reduced channel-count system.
Conclusions:
- The developed system and reconstruction techniques show feasibility for hydrocarbon vapor imaging in engine cylinders.
- Further development is expected to enable full tomographic imaging for detailed combustion analysis.
- This technology holds potential for advancing internal combustion engine research and development.