Mole-Fraction-Sensitive Imaging of Hypermixing Shear Layers
Date
2001
Authors
Fox, J
Houwing, A Frank
Danehy, Paul
Gaston, M
Mudford, N
Gai, S
Journal Title
Journal ISSN
Volume Title
Publisher
American Institute of Aeronautics and Astronautics
Abstract
A theoretical model that determines the optimum excitation frequency for obtaining a fluorescence signal with a strong dependence on fuel mole fraction is presented for supersonic fuel-air compressible mixing studies. The challenge associated with this is to maintain a high sensitivity to fuel mole fraction with minimal sensitivity to temperature and pressure in a flow with large temperature variations and pressure gradients. The results of the model are applied to the mixing region behind various scramjet fuel injectors in a shock tunnel to measure fuel mole fraction. Hydrogen fuel at a Mach number of 1.7 is injected into a mostly N2 freestream at Mach 4.8. Experimental fluorescence images are presented in streamwise and spanwise planes.
Description
Keywords
Keywords: Fluorescence; Fuel injection; Hydrogen fuels; Mathematical models; Wind tunnels; Hypermixing shear layers; Mach number; Aircraft propulsion
Citation
Collections
Source
Journal of Propulsion and Power
Type
Journal article