UV Laser System
Abstract
Improvements in modeling of non-equilibrium behavior in hypersonic flows requires both improved measurements of key reaction and relaxation rates and a database of state resolved species time-histories for mechanism validation and testing. Laser absorption measurements in shock tubes can provide these types of data and can give a fuller picture of the chemical, vibrational and electronic relaxation processes in high-temperature air than currently exist. Several critical species found in non-equilibrium high temperature air that can be generated behind incident and reflected shock waves include excited O* and N* atoms, NO radicals in quantum-specific states, as well as meta-stable O2 and N2 and aeronomic ions.Beyond these excited atomic species, vibrational-level-dependent measurements of O2 andNO radicals are needed. Accessible transitions for these species can be found in the deep UV absorption from 211 to 230 nm. The proposed application of quantum-state-specific measurements of time-histories of atomic and now molecular species behind strong shock waves in air offers a unique opportunity to advance current understanding of non-equilibrium processes associated with hypersonic air flows.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 09, 2018
- Source ID
- FA95501710430
Entities
People
- Ronald Kent Hanson
Organizations
- Air Force Office of Scientific Research
- Stanford University
- United States Air Force