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Development of a High-Pressure Gaseous Burner for Calibrating Optical Diagnostic Techniques (in English)
Nasa Technical Reports Server (Ntrs)
(Author)
·
Jun Kojima
(Author)
·
Quang-Viet Nguyen
(Author)
·
Bibliogov
· Paperback
Development of a High-Pressure Gaseous Burner for Calibrating Optical Diagnostic Techniques (in English) - Kojima, Jun ; Nguyen, Quang-Viet ; Nasa Technical Reports Server (Ntrs)
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Synopsis "Development of a High-Pressure Gaseous Burner for Calibrating Optical Diagnostic Techniques (in English)"
In this work-in-progress report, we show the development of a unique high-pressure burner facility (up to 60 atm) that provides steady, reproducible premixed flames with high precision, while having the capability to use multiple fuel/oxidizer combinations. The highpressure facility has four optical access ports for applying different laser diagnostic techniques and will provide a standard reference flame for the development of a spectroscopic database in high-pressure/temperature conditions. Spontaneous Raman scattering (SRS) was the first diagnostic applied, and was used to successfully probe premixed hydrogen-air flames generated in the facility using a novel multi-jet micro-premixed array burner element. The SRS spectral data include contributions from H2, N2, O2, and H2O and were collected over a wide range of equivalence ratios ranging from 0.16 to 4.9 at an initial pressure of 10-atm via a spatially resolved point SRS measurement with a high-performance optical system. Temperatures in fuel-lean to stoichiometric conditions were determined from the ratio of the Stokes to anti-Stokes scattering of the Q-branch of N2, and those in fuel-rich conditions via the rotational temperature of H2. The SRS derived temperatures using both techniques were consistent and indicated that the flame temperature was approximately 500 K below that predicted by adiabatic equilibrium, indicating a large amount of heat-loss at the measurement zone. The integrated vibrational SRS signals show that SRS provides quantitative number density data in high-pressure H2-air flames.
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