TY - GEN
T1 - Instability investigations in non-equilibrium hypersonic reacting flat-plate boundary-layer flowwith DNS
AU - Stemmer, Christian
PY - 2009
Y1 - 2009
N2 - Non-equilibrium high-speed boundary layers over a flat plate is investigated with Direct Numerical Simulations.A finite difference method of high-order accuracy that has proven its capabilities for laminar-turbulent transition in supersonic boundary-layer flows has been extended for the modeling of thermodynamic coefficients for high-temperature air mixtures as well the handling of the 5 species O, O2, N, N2 and NO. Vibrational energy is also considered with a separate transport equation. Steady flow calculations show the species distributions and the temperature development in a flat plate boundary layer at a Mach number of 20 at Standard Atmosphere conditions in an altitude of H=50 km. This base flow is then disturbed through period blowing and suction at the wall. The spatial three-dimensional disturbance development is presented as well as the species development in the high-speed boundary-layer flow. Key words: laminar-turbulent transition, instability, hypersonic boundary layer, chemical non-equilibrium.
AB - Non-equilibrium high-speed boundary layers over a flat plate is investigated with Direct Numerical Simulations.A finite difference method of high-order accuracy that has proven its capabilities for laminar-turbulent transition in supersonic boundary-layer flows has been extended for the modeling of thermodynamic coefficients for high-temperature air mixtures as well the handling of the 5 species O, O2, N, N2 and NO. Vibrational energy is also considered with a separate transport equation. Steady flow calculations show the species distributions and the temperature development in a flat plate boundary layer at a Mach number of 20 at Standard Atmosphere conditions in an altitude of H=50 km. This base flow is then disturbed through period blowing and suction at the wall. The spatial three-dimensional disturbance development is presented as well as the species development in the high-speed boundary-layer flow. Key words: laminar-turbulent transition, instability, hypersonic boundary layer, chemical non-equilibrium.
UR - http://www.scopus.com/inward/record.url?scp=66949120291&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:66949120291
SN - 9789292212230
T3 - European Space Agency, (Special Publication) ESA SP
BT - Proceedings of the 6th European Symposium on Aerothermodynamics for Space Vehicles
T2 - 6th European Symposium Aerothermodynamics for Space Vehicles
Y2 - 3 November 2008 through 6 November 2008
ER -