Multiscalar Analyses of High-Pressure Swirl-Stabilized Combustion via Single-Shot Dual-SBG Raman Spectroscopy

• Published in: Combustion science and technology Vol. 185; no. 12; pp. 1735 - 1761
• Main Authors: Kojima, Jun J., Fischer, David G.
• Format: Journal Article
• Language: English
• Published: Philadelphia, PA Taylor & Francis Group 02.12.2013; Taylor & Francis; Taylor & Francis Ltd
• Subjects: Accuracy; Applied sciences; Calibration; Combustion; Combustion diagnostics; Combustion. Flame; Diagnostic systems; Energy; Energy. Thermal use of fuels; Exact sciences and technology; High-pressure combustion; Impact analysis; Measurement; Methane; Pressure; Raman spectroscopy; Scalar analysis; Spectra; Statistical analysis; Temperature effects; Theoretical studies. Data and constants. Metering; Turbulent flames; Turbulent flow; Stabilized combustion; Turbulent flow; High-pressure combustion; Flame structure; Scalar analysis; Raman spectrometry; Flame propagation; Raman spectroscopy; High pressure; Combustion diagnostics
• ISSN: 0010-2202; 1563-521X
• DOI: 10.1080/00102202.2013.832231

We report an experimental study and thermochemical analysis of high-pressure swirl-stabilized combustion utilizing subframe burst gating (SBG) Raman spectroscopy. SBG Raman spectroscopy is a novel diagnostic technique that provides increased accuracy of quantitative scalar measurements in a single-shot pointwise manner. A recent modification of our original system allows parallel detection of both Stokes and anti-Stokes spectral components (hence the term dual SBG). We begin by briefly describing the experimental construction of a Raman calibration matrix, which allows us to reduce spectral cross-talk in the measurements. Next we describe the application of dual-SBG Raman spectroscopy to simultaneous single-shot measurement of temperature and species mass fractions in a turbulent flame stabilized over a lean-direct-injection (LDI) burner using gaseous methane fuel at elevated pressure of 17 atm. Our discussion includes the practical challenges of Raman spectroscopy in a pressurized combustion rig. Statistical analyses of the single-shot thermochemical data provide insights into the nature of the partial-premixing process and its impact on the subsequent combustion process.