Spectroscopic Measurements for Recombination Modeling in High-Enthalpy Expanding
Abstract
Extensive recent AFOSR-supported efforts have been devoted to understanding and modeling internal energy exchange and chemical reactions in hypersonic flows using first-principles calculations. However, the validation and implementation of models, ranging in fidelity and computational cost, is hampered by the lack of experimental data in hypervelocity flowfields that are more than just surface measurements. On-going research efforts, including an AFOSR-supported project the PI is currently leading, are applying spectroscopic measurements to post-shock flows where dissociation reaction mechanisms that have been recently developed can be tested and differentiated. In the proposed work, ongoing experiments in will be leveraged and extended by the requested support for an additional student to meet two objectives: i) To expand emission spectroscopy diagnostic capabilities to include calibration for absolute radiance measurements. The current project has identified optically-thin conditions in selected post-shock flows. ii) To provide validation data for the first-principles recombination chemistry models that are in development under the current award. As a post-shock flow is expanded due to vehicle geometry, around the nose or in the wake of a protuberance, recombination reactions become important.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 21, 2022
- Source ID
- FA95502110080XX0
Entities
People
- Joanna Austin
Organizations
- Air Force Office of Scientific Research
- California Institute of Technology
- United States Air Force