Quasi-classical trajectory-based non-equilibrium chemical reaction models for hypersonic air flows

2019 ◽  
Vol 31 (10) ◽  
pp. 106102 ◽  
Author(s):  
Tapan K. Mankodi
Keyword(s):  
Chemical Reaction ◽  
Classical Trajectory ◽  
Reaction Models ◽  
Air Flows ◽  
Equilibrium Chemical Reaction ◽  
Equilibrium Chemical ◽  
Non Equilibrium

scholarly journals On the use of catalysis to bias reaction pathways in out-of-equilibrium systems

2021 ◽  
Author(s):  
Michelle P. van der Helm ◽  
Tuanke de Beun ◽  
Rienk Eelkema
Keyword(s):  
Chemical Reaction ◽  
Reaction Network ◽  
Steady States ◽  
Chemical Reaction Network ◽  
Reaction Pathways ◽  
Maximum Conversion ◽  
Equilibrium Chemical Reaction ◽  
Equilibrium Chemical ◽  
Non Equilibrium

We show, via simulations, how catalytic control over individual paths in a fuel-driven non-equilibrium chemical reaction network in batch or flow gives rise to responses in maximum conversion, lifetime and steady states.

Analysis and Calculation of Chemical Non-Equilibrium Turbulent Flow in a Scramjet Nozzle

2009 ◽  
Author(s):  
X. Y. Wang ◽  
G. N. Xie ◽  
B. Sunde´n
Keyword(s):  
Chemical Reactions ◽  
Chemical Reaction ◽  
Equilibrium Flow ◽  
Reaction Models ◽  
Mass Fractions ◽  
Total Temperature ◽  
Inlet Conditions ◽  
And Performance ◽  
Equilibrium Chemical ◽  
Non Equilibrium

In this paper, 7-species, 8-step finite-rate chemical reaction models of the non-equilibrium flow in a scramjet single expansion ramp nozzle have been investigated numerically. Chemical reactions and mass transfer under various freestream Mach numbers and flight height conditions are performed by the RNG k-ε turbulence model. The fluid flow in the nozzle is analyzed under non-equilibrium chemical reactions and frozen flow conditions. It is shown that the total temperature is obviously increased while the total pressure is evidently decreased in the chemical non-equilibrium flow at certain inlet conditions. The mass fractions of H2 and O2 are decreased while that of H2O is increased, and the mass fraction of N2 is almost identical throughout the whole reaction process. This indicates that combustion occurs in the nozzle, and the scramjet nozzle can supplement the combustion in a supersonic combustor so that the performance of the nozzle can be increased. It can be found that there are eddies in the chemical non-equilibrium flow because of the variations of the mass fractions of O2, H, O and OH. These eddies suggest that the variations of the mass fractions of O2, H, O and OH is non-monotonic. Although the flow is speeded up, the chemical reaction at the beginning part of the nozzle is faster than that downstream. The calculation shows that the non-equilibrium chemical reactions should always be considered in investigations of the flow and performance of scramjet nozzles.

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