Kinetics and Energy Transfer in Nonequilibrium Fluid Flows
Final rept. 17 Jun 90-16 Sep 92,
SRI INTERNATIONAL MENLO PARK CA MOLECULAR PHYSICS CENTER
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Chemical kinetics and energy transfer have been investigated for nonequilibrium fluid flow. The particular process of interest is ultraviolet emission from the A2 sigma excited electronic state of NO, which is generated under nonequilibrium conditions in the bow shock waves of ascending missiles at 50 to 100 km altitude. A literature survey of the pertinent rate constants and mechanism for use in computer models of the process has been undertaken. Emission from NO has been studied in shock tubes, using shock heated air and other gas mixtures. Collisional quenching of the A2 sigma state is the reverse of heavy particle excitation of the emission. Its temperature dependence has been studied in a heated cell and a shock tube. An attempt was made to determine the final vibrational state distribution in the ground electronic state, concluding that the NO is transferred into high vibrational levels.
- Fluid Mechanics