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Development of a High-Pressure Gaseous Burner for Calibrating Optical Diagnostic TechniquesIn 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.
Document ID
20040028038
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Kojima, Jun
(NASA Glenn Research Center Cleveland, OH, United States)
Nguyen, Quang-Viet
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
September 7, 2013
Publication Date
December 1, 2003
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
E-14263
NASA/TM-2003-212738
Funding Number(s)
WBS: WBS 22-714-02-16
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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