Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
168318 | Combustion and Flame | 2006 | 19 Pages |
This article deals with the application of OH planar laser-induced fluorescence (PLIF) to the study of high-pressure cryogenic flames (p=6.3 MPa)(p=6.3 MPa). It is shown that this optical diagnostic provides good-quality data and can be used to examine the flame structure in the injector near-field. High-pressure conditions require a careful choice of excitation wavelength based on a detailed analysis of the absorption coefficient dependence on pressure and temperature. It is particularly important to consider line-broadening and central-frequency-shifting effects induced by high-pressure operation. PLIF is used to examine jet flames formed by a single coaxial injector fed by liquid oxygen and gaseous hydrogen (LOx/GH2) in subcritical and transcritical regimes. In the latter case, the liquid oxygen temperature is below its critical value while its pressure is above critical (TLOx=85 K