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Scanned-wavelength-modulation spectroscopy near 2.5 μm for H2O and temperature in a hydrocarbon-fueled scramjet combustor

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Abstract

The design and demonstration of a two-color tunable diode laser sensor for measurements of temperature and H2O in an ethylene-fueled model scramjet combustor are presented. This sensor probes multiple H2O transitions in the fundamental vibration bands near 2.5 μm that are up to 20 times stronger than those used by previous near-infrared H2O sensors. In addition, two design measures enabled high-fidelity measurements in the nonuniform flow field. (1) A recently developed calibration-free scanned-wavelength-modulation spectroscopy spectral-fitting strategy was used to infer the integrated absorbance of each transition without a priori knowledge of the absorption lineshape and (2) transitions with strengths that scale near-linearly with temperature were used to accurately determine the H2O column density and the H2O-weighted path-averaged temperature from the integrated absorbance of two transitions.

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Acknowledgments

This work was sponsored by the Air Force Office of Scientific Research (AFOSR) and by the National Center for Hypersonic Combined Cycle Propulsion, Grant FA 9550-09-1-0611, with technical monitors Dr. Chiping Li (AFOSR) and Dr. Richard Gaffney (NASA). The authors would like to thank Professor Chris Goyne, Dr. Robert Rockwell, PhD Candidate Brian Rice, and Mr. Roger Reynolds for operating the UVaSCF and hosting the measurement campaign at the University of Virginia.

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  1. High Temperature Gasdynamics Laboratory, Department of Mechanical Engineering, Stanford University, Stanford, CA, 94305, USA

    C. S. Goldenstein, I. A. Schultz, R. M. Spearrin, J. B. Jeffries & R. K. Hanson

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  1. C. S. Goldenstein
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Correspondence to C. S. Goldenstein.

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Goldenstein, C.S., Schultz, I.A., Spearrin, R.M. et al. Scanned-wavelength-modulation spectroscopy near 2.5 μm for H2O and temperature in a hydrocarbon-fueled scramjet combustor. Appl. Phys. B 116, 717–727 (2014). https://doi.org/10.1007/s00340-013-5755-0

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