A probe to estimate the local fuel concentration in spark ignition engines: design and validation study of catalytic hot wire probe |
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| Affiliation: | 1. DICATAM - Sez. Matematica, Università degli Studi di Brescia, Via Branze 43, I-25123 Brescia, Italy;2. Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, Parco Area delle Scienze 53/A, I-43124 Parma, Italy;3. Dipartimento di Matematica e Fisica, Università Cattolica del Sacro Cuore, Via Musei 41, I-25121 Brescia, Italy;2. Chinese People''s Liberation Army No. 94 Hospital, Nanchang, China;3. Department of Orthopaedics, the First Affiliated Hospital of Chinese People''s Liberation Army General Hospital, Beijing, China;3. Institute of Biochemistry and Molecular Biology II, Hepatology, and Infectious Diseases, Medical Faculty of the Heinrich-Heine University, 40255 Düsseldorf;4. Clinic of Gastroenterology, Hepatology, and Infectious Diseases, Medical Faculty of the Heinrich-Heine University, 40255 Düsseldorf;5. Leibniz Institute for Age Research-Fritz Lipmann Institute, 07745 Jena;6. Department of Systemic Cell Biology, Max Planck Institute of Molecular Physiology, 44227 Dortmund, Germany |
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| Abstract: | A catalytic hot wire probe (CHWP) technique has been developed to estimate the local fuel concentration near the spark plug of a spark ignition engine. Knowledge of this local concentration is highly useful in studying the combustion process. The small fuel concentration variation is measured by superimposing a catalysis effect in the thermal balance of the hot wire. Various parameters such as pressure, temperature and sampling velocity have been tested for their effect on the hot wire catalytic response.To validate this CHWP technique, local fuel concentration was also measured by two optical diagnostic techniques: planar laser-induced fluorescence (PLIF) and fuel/air ratio laser-induced exciplex fluorescence (FARLIEF). Comparison with PLIF measurements shows good agreement, and the capabilities and limitations of both techniques. With the FARLIEF/CHWP study, we can characterise the time and spatial variation of the fuel/air ratio in the vicinity of the spark plug in the gasoline direct injection engine. |
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