A comprehensive modeling study of hydrogen oxidation

Abstract

A detailed kinetic mechanism has been developed to simulate the combustion of H 2 /O 2 mixtures, over a wide range of temperatures, pressures, and equivalence ratios. Over the series of experiments numerically investigated, the temperature ranged from 298 to 2700 K, the pressure from 0.05 to 87 atm, and the equivalence ratios from 0.2 to 6.Ignition delay times, flame speeds, and species composition data provide for a stringent test of the chemical kinetic mechanism, all of which are simulated in the current study with varying success. A sensitivity analysis was carried out to determine which reactions were dominating the H 2 /O 2 system at particular conditions of pressure, temperature, and fuel/oxygen/diluent ratios. Overall, good agreement was observed between the model and the wide range of experiments simulated. C

The Soret effect in naturally propagating, premixed, lean, hydrogen–air flames

“…It may be necessary to reexamine conclusions about premixed, lean, hydrogen-air flames that have been drawn from direct numerical simulations using simplified transport models. [43], and O'Connaire [44]. Measured data is from: Aung [37], Dowdy [45], Tse [46], and Vagelopoulos [47].…”

Influence of channel geometrical properties and turbulence on propellant ignition in hypersonic ramjet combustion chamber

“…For their calculation K-ε-Vn turbulence model was used [1], as well as standard K-ε and SST models. For calculation of the formation rates of the chemical components, two models of chemical kinetics of hydrogen combustion are considered: the reduced one, presented in Table 1, and the complete system of reactions, described in detail in [2]. …”

Large eddy simulation of laser ignition and compressible reacting flow in a rocket-like configuration

“…Indeed, the chamber pressure initially equal to 1.85 bar reaches 11 bar during the ignition sequence and the effect on chemistry is significant. Figure 6 shows the comparison between detailed chemistry [60] and the seven-step scheme for the prediction of the flame speed at different equivalence ratios and at 1 bar. The laminar flame velocity is predicted with a maximum error of about 10% around an equivalence ratio of 1.5 and is correct for both lean and rich conditions.…”

“…Pressure effects are more difficult to assess quantitatively as there are no measurements and detailed chemistry calculations do not agree, as shown in fig. 7 where three detailed chemical schemes from O'Conaire et al [60], Kee et al [61] and Smooke et al [62] are compared with the reduced H2O2-GL7-1 scheme. The velocity obtained with the reduced scheme is in the range of the three complex schemes.…”