Toward High-Enthalpy Simulations for Hypersonic Applications: The Double Cone Test Case
Abstract
Computational modeling approaches for chemical and thermal nonequilibrium hypersonic flows were investigated. The test case was a canonical double-cone in a Mach 13, high-enthalpy 22 MJ/kg flow environment, modeled after the University of Queensland X3 wind tunnel experiments. State-of-the-art numerical simulations employed full Navier-Stokes with multi-specie finite-rate chemical kinetics, vibrational relaxation, coupling of vibration and dissociation via a two-temperature nonequilibrium approach, and modeling of viscosity, thermal conductivity and diffusion transport properties specifically geared for high-temperature gases. Flow-field solutions showed complex shockshock and shockboundary layer interactions. The high-temperature post-shock showed a high degree of dissociation of nitrogen and oxygen, vibrational excitation, and thermochemical nonequilibrium. Predicted surface pressures and peak heat flux matched well with experiment; however, uncertainties exist in the general prediction of heat flux and corner flow separation. Additionally, the use of a single-specie perfect gas model emphasized the need for modeling high-temperature gas effects. The perfect gas model retained more energy in the flow, which drastically changed the shock structures, and significantly overpredicted the extent of flow separation and peak heating.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 06, 2023
- Accession Number
- AD1216596
Entities
People
- Jubaraj Sahu
- Vishal A. Bhagwandin
Organizations
- United States Army Research Laboratory