Quantitative Analysis of Planar Laser-Induced Fluorescence Measurements in a Hypersonic Boundary Layer

McDougall, Connor C ; Hinman, W Schuyler ; Johansen, Craig T ; Bathel, Brett F ; Inman, Jennifer A ; Danehy, Paul M

关键词: LASER INDUCED FLUORESCENCE;    HYPERSONIC BOUNDARY LAYER;    QUANTITATIVE ANALYSIS;    HEAT FLUX;    HEAT TRANSFER;    NITRIC OXIDE;    SURFACE TEMPERATURE;    TEMPERATURE MEASUREMENT;    WALL TEMPERATURE;    COMPUTATIONAL FLUID DYNAMICS;   

RP-ID  :  NF1676L-29161

学科分类：力学，机械学

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

Several quantitative measurements extracted from nitric oxide (NO) planar laser-induced fluorescence (PLIF) data obtained in a hypersonic boundary layer are reported: (a) off-body NO mole fraction; (b) surface heat flux; and (c) near-wall static temperature. The experimental data was obtained at NASA Langley Research Center’s 31 in. Mach 10 air tunnel. NO was seeded into the flow through a spanwise slot on the surface of the 10 degree half-angle wedge model. An ultraviolet planar laser sheet was positioned perpendicular to the wedge surface, downstream of the seeding slot, to excite six fluorescence transitions. A method for extracting the relative NO mole fraction, based on spatial variations of the J”= 0.5 PLIF signal, is presented. Combined with the principle of mass conservation, the absolute NO mole fraction is determined. These measurements were used to assess CFD diffusion modelling, correct previously reported PLIF thermometry results, and develop methods for NO-PLIF heat transfer measurements.