Objective
The objective of this project is the study of physico-chemical kinetics in hyperenthalpic and hypersonic multitemperature and multicomponent reacting gases consisted of C-O-N atoms for the development of detailed modelling of non-equilibrium processes in such gas mixtures behind strong shock waves and expanding flows, and numerical simulation of aerodynamics in CO2-N2 atmosphere taking into account the real gas properties.
The proposed project will be performed by joint efforts of research teams from ONERA in France, University of Barcelona in Spain, Institute of Mechanics of Moscow State University and Institute of High Temperatures of Russian Academy of Sciences in Moscow, Institute of Theoretical and Applied Mechanics of Siberian Branch of Russian Academy of Sciences in Novosibirsk and Institute of Physics of Ukrainian Academy of Sciences in Kiev.
Investigation of the process of thermally non-equilibrium dissociation of CO molecules behind the shock wave front, using measurements of vibrational temperatures of CO during the dissociation by two-channel absorption in the vacuum UV spectrum and modelling of two-temperature dissociation rate constants of CO in conditions of vibration non-equilibrium, will be performed by the team from Institute of Mechanics in Moscow. This will give information about features of CO dissociation behind strong shock waves and allows to create a quantitative model of two-temperature dissociation rate constants.
The team from Institute of Physics in Kiev will conduct experimental studies of chemiluminescent reactions NO+O and CO+O in hypersonic flows. The shock tube and supersonic nozzle technique will be used, and methods of multichannel UV-VIS-NIR emission spectroscopy will be applied. The peculiarities of kinetics and mechanism of radiative recombination NO+O and CO+O in shock waves and supersonic flows in non-equilibrium conditions will be analysed, and respective rate constants at high temperatures will be determined.
The team from IVTAN in Moscow will perform the experimental and numerical study of energy-exchange, dissociative and recombinative processes in non-equilibrium flows of shock-heated CO2-N2 gas mixtures.
The influence of supercollisions in the shock wave front on the development of chemical processes behind the shock wave front will be studied experimentally in IVTAN in Moscow and by numerical simulation with Monte-Carlo method in ITAM in Novosibirsk. It is suggested to consider the impact excitation of internal degrees of freedom, and initiation of chemical reactions also. An important part of work will be computation of velocity distribution functions inside the shock wave. The distributions of rotational and vibration energies will be also computed. The team from ITAM in Novosibirsk will also conduct a numerical simulation of the supersonic rarefied gas flows at conditions that are typical for spacecraft's entering Earth's and Mars's atmosphere.
The team of ONERA in France will undertake the multiplex (instantaneous) CARS measurements of rotational and vibration temperatures of the molecular components in the free stream of the wind tunnel F4; attempt the O atom concentration measurements by two-photon DFWM also in the free stream; perform numerical simulation of the gas flow parameters by Navier-Stokes codes taking into account the real gas properties and compare with experimental data in connection with other participants of the project.
Theoretical study of the collision dynamics and kinetics of elementary processes (reactive, quenching,) involving interaction of the ground and the first electronic excited states of O and N atoms with several diatomic molecules (CO, NO, N2, O2) will be performed jointly by the teams of University of Barcelona in Spain and the Institute of Mechanics in Moscow.
One of the goals of studies in Barcelona is to check the validity of the theoretical approaches based on the first principles and to furnish new kinetic data for elementary processes in the conditions where experimental data are not usually available. Ab initio methods will be used for the characterization of the electronically adiabatic potential energy surfaces, which govern these processes. The application of the Variational Transition State Theory and Quasi-Classical Trajectory methods allows determining the thermal and state-specific rate constants and other properties of these kinds of processes. In Moscow, it is planned to study the exchange reaction CO+N->CN+O by Quasi-Classical Trajectory method in the framework of adiabatic approach. It is also planned to learn the influence of an error of potential energy surfaces data on trajectory calculation results. The research aim is to obtain the cross-sections, state-to-state and two-temperature rate constants of the processes depending on both vibration and translational temperatures.
Development of detailed modelling of non-equilibrium physico-chemical processes for simulation of hyperenthalpic and hypersonic multi-temperature reacting gases containing C-N-O atoms, will be performed by the team of Institute of Mechanics in co-operation with others teams. It is expected to create a program module including required models and a base of reliable data for multi-temperature rate constants. It will allow describing adequately various non-equilibrium processes. It is planned this program module will be tested using available and expected experimental data and will be utilized by all partners.
The research programme of the proposed project is scheduled to be completed in 24 months.
Call for proposal
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