Project Title:
Basic Governing Equations and Physical Models for Highly Nonequilibrium Hypersonic
02.03-3921
912538
Basic Governing Equations and Physical Models for Highly Nonequilibrium Hypersonic
Flows
BSA Services
4010 Tidewater
Houston
TX
77045
Jong-Hun
Lee
713-433-3921
ARC
NAS2-13554
015
02.03-3921
912538
Abstract:
Basic Governing Equations and Physical Models for Highly Nonequilibrium Hypersonic
Flows
This project will investigate the use of a four-temperature concept for highly nonequilibrium
hypersonic flows. The development of hypersonic space vehicles for future NASA missions
involves knowledge of complex aerothermodynamic phenomena such as thermal and chemical
nonequilibrium. Since it is extremely difficult to simulate the thermochemically
complex flow field around vehicle models in a ground-based experimental facility,
it is highly desirable to obtain accurate numerical computations of the flow field.
To do so, it necessary to have a physically valid set of conservation equations in
the flow regimes of interest. The objective of this project is to develop a basic
set of governing equations and physical models based on the concept of four independent
temperatures (translational, rotational, vibrational-electronic, and electron temperatures),
for the highly nonequilibrium hypersonic flows around future space vehicles. A phenomenological
approach will be taken to clarify the technical issues to be resolved and to examine
possible engineering methods to attack the issues. This comprehensive analysis of
expected thermochemical nonequilibrium phenomena proposed for Phase I will provide
the basis for further development of the detailed physical models. Phase II will
incorporate these models into the required set of basic governing equations.
This work will establish the theoretical feasibility of phenomenological models in
the highly nonequilibrium hypersonic flow around future space vehicles and planetary
probes. The governing equations and physical models obtained may become the basis
for future development of computational fluid dynamics codes that will be used in
the design of proposed space vehicles and planetary probes.
nonequilibrium, aerothermodynamics, hypersonic, aeroassist entry, space vehicle,
planetary probes