Accession Number:

AD1104529

Title:

Multi-Step Computational Modeling and Shock-Tube Study of Energy TransferProcesses in High-Enthalpy Air

Descriptive Note:

Technical Report,01 Sep 2016,30 Sep 2019

Corporate Author:

REGENTS OF THE UNIVERSITY OF MICHIGAN ANN ARBOR United States

Personal Author(s):

Report Date:

2019-12-05

Pagination or Media Count:

57.0

Abstract:

This project involved a carefully coordinated set of activities that aimed to significantly improve our understanding of the molecular energy transfer processes of oxygen species in flows of high enthalpy air characteristic of hypersonic vehicles. The work at the University of Michigan focused on computational analyses. Molecule-molecule interactions were studied using computational chemistry in which accurate potential energy surfaces PES for specific molecular interactions were used in high fidelity trajectory calculations to determine the process rates, resolved by internal energy state. The rates were used in master equation analyses of heat baths and shock waves. The heat bath analyses allowed the extraction of low order models that can be used in multidimensional computational fluid dynamics CFD simulations of hypersonic flows. At Stanford, shock tube experiments were conducted to generate new information and provide data to validate the models. Progress in this project focused on an improved absorption model for O2, design of experiments employing a shock tube code provided by Michigan, new measurements of vibrational relaxation times and dissociation rate coefficients of O2, and new measurements of excited state oxygen atoms.

Subject Categories:

  • Fluid Mechanics
  • Thermodynamics
  • Atomic and Molecular Physics and Spectroscopy
  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE