Research & Development

JAXA promotes three research and development programs and a fundamental research program that underpins them.

Combustion Stability Diagnostics by Utilizing Optical Measurements

Optical measurements, such as the OH-PLIF and OH* chemiluminescence imaging, were performed on a lean-burn combustor under combustion instabilities. Unsteady flame motions were successfully captured and used to detect the driving source of the combustion instability.

For more information, please refer to the following Ref [1].

Fig.1 Schematics of a lean-burn fuel injector mounted on the combustor with visualization windows.

Fig.2 Dynamic flame structures captured by the phase-resolved probability distributions in high-gradient OH-PLIF regions and Abel-inverted OH* chemiluminescence intensity under unstable experimental conditions.

Fig.3 Local Rayleigh index map (Positive region indicates the driving source of the instability.
Only the lower half of the domain is shown.)

Figures are reprinted from Ref. [1], Copyright (2015), with permission from Elsevier.

Ref.[1] Tachibana, S., Saito, K., Yamamoto, T., Makida, M., Kitano, T., Kurose, R. (2015) “Experimental and numerical investigation of thermo-acoustic instability in a liquid-fuel aero-engine combustor at elevated pressure: Validity of large-eddy simulation of spray combustion”, Combust. Flame 162, 2621-2637.

March 31, 2020

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