Effect of incident laser sheet orientation on the OH-PLIF imaging of detonations

Chatelain, Karl P.; Mével, Rémy; Melguizo-Gavilanes, J.; Chinnayya, A.; Xu, Shunjian; Lacoste, Déanna A.

doi:10.1007/s00193-020-00963-y

Cited by 17 publications

(6 citation statements)

References 22 publications

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“…Hence, an efficient alternative to reduce the computational cost is to study the detonation propagation in the SFR. Another efficient method is to use a block recycling technique like in the RESIDENT code [18,53]. Only, the former approach is considered in this work.…”

Section: -D Resultsmentioning

confidence: 99%

“…In this study, all the spatial dimensions are normalized by ∆ i . The numerical results for the mixture 2H 2 + O 2 + 10Ar is available in the open literature [53] while experimental results for the same condition are not available. Hence, in order to perform quantitative comparison between experiments [51] and numerical solution in terms of cell size, we have chosen the mixture 2H 2 + O 2 + 3.76Ar.…”

Section: Simulation Setupmentioning

confidence: 99%

See 1 more Smart Citation

Validation of High Speed Reactive Flow Solver in OpenFOAM with Detailed Chemistry

Sankar,

Chatelain,

Melguizo-Gavilanes

et al. 2024

OpenFOAM J

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An OpenFOAM® based hybrid-central solver called reactingPimpleCentralFoam is validated to compute hydrogen-based detonations. This solver is a pressure-based semi-implicit compressible flow solver based on central-upwind schemes of Kurganov and Tadmor. This solver possesses the features of standard OpenFOAM® solvers namely, rhoCentralFoam, reactingFoam and pimpleFoam. The solver utilizes Kurganov & Tadmor schemes for flux splitting to solve the high-speed compressible regimes with/without hydrodynamic discontinuity. In this work, we present the validation results that were obtained from one-dimensional (1D) and two-dimensional (2D) simulations with detailed chemistry. We consider three different mixtures that fall into the categories of weakly unstable mixture (2H2 +O2 +3.76Ar and 2H2 +O2 +10Ar), and moderately unstable mixture (2H2 +O2 +3.76N2), based on their approximate effective activation energy. We performed the numerical simulations in both laboratory frame of reference (LFR) and shock-attached frame of reference (SFR) for the 1D cases. The 1D simulation results obtained using this solver agree well with the steady-state calculations of Zel’dovich von Neumann Döring (ZND) simulations with an average error below 1% in all cases. For the 2D simulations, circular hot-spots were used to perturb the initially-planar detonations to develop into spatio-temporally unstable detonation front. The convergence is declared when the front does not deviate much from the CJ speed (Chapman-Jouguet) and the regularity of cellular pattern on the numerical smoke foils reaches a steady state. We have verified from our preliminary studies that the SFR-based simulations are computationally cheaper in comparison to the LFR simulations and that the required grid resolution is always lesser in the former than the latter to reach the same level of accuracy (in terms of speed of the detonation front and cell sizes from the numerical smoke foil). We have also verified that at least 24 points per induction zone length (for weakly unstable mixture) and 40 points per induction zone length (for moderately unstable mixture) are required to sufficiently resolve the detonation structures that are independent of grids, boundary and initial conditions. Further reduction in computational cost of approximately 50% is achieved by using non-uniform grids, which converge effectively to the same solutions in comparison to the results from twice the number of grids with uniform resolution.

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Section: -D Resultsmentioning

confidence: 99%

Section: Simulation Setupmentioning

confidence: 99%

Validation of High Speed Reactive Flow Solver in OpenFOAM with Detailed Chemistry

Sankar,

Chatelain,

Melguizo-Gavilanes

et al. 2024

OpenFOAM J

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“…All the ZND simulations were performed using the incident shock reactor model of ANSYS Chemkin-Pro [14]. This reactor model was selected over the classical ZND simulations tools (i.e., ZNDkin [15,16] or the Shock and detonation toolbox (SDT) [17]) due to the large reaction models employed in this study (see the reaction model presentation). The validation of the incident shock reactor model is available in [18].…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Detailed Reaction Models for the Modeling of Double Cellular Structures in Gaseous Nitromethane Detonation

Dunstan

Chatelain

Lacoste

2022

AIAA SCITECH 2022 Forum

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This study aims at evaluating the performance of three reaction models to reproduce cell size measurements obtained during nitromethane-oxygen and pure nitromethane detonations (𝑇 1 = 383 − 390 K, 𝑃 1 = 20 − 100 kPa, and 𝜙 = 0.2 − 1.75). The validation dataset is composed of 47 cell size measurements and includes conditions presenting both single (𝜆 1 only) and double (𝜆 1 and 𝜆 2 ) cellular structures. Zeldovich'-von Neumann-Döring (ZND) simulations are employed to compute the cell size 𝑛 (𝜆 𝑛 ) by utilizing the induction zone lengths (Δ 𝑖,𝑛 ) and a correlation factor (𝐴 𝑛 ), determined from the Ng method. The main results are: (i) the computed correlation factors appear insensitive to the reaction model and to the type of cells (𝜆 1 and 𝜆 2 ), Thus, an averaged correlation factor 𝐴 = 37 could be employed in future studies; (ii) qualitatively, all the models are underestimating 𝜆 1 in most of the conditions but are satisfactory reproducing 𝜆 2 in rich conditions; (iii) quantitatively, Le's model has the lowest error to reproduce the cell sizes (4.3 in average) and the lowest ratio 𝜆 2 /𝜆 1 (near 5 in most conditions).

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“…Equations ( 21) to (23) correspond to the ZND model expressed as a function of distance. For numerically solving this system of equation, it is convenient to employ a Lagrangian description.…”

Section: Appendix: Governing Equationsmentioning

confidence: 99%

“…A common approximation made in some of our previous studies was to use either the constant volume (CV) or the constant pressure (CP) model to calculate the length-scale or the reaction pathways under steady conditions [15,16,17,18]. This approximation was mainly motivated by the lack of a numerical tool for chemical kinetics analyses in our in-house ZND code, referred to as ZNDkin [15,16,19,20,21,22,23,24]. Such tools are also not available in the detonation toolbox (SDT) [25], a popular opensource detonation modeling package implemented in Cantera [26].…”

Section: Introductionmentioning

confidence: 99%

Effect of the reactor model on steady detonation modeling

Chatelain

Mével

et al. 2021

Shock Waves

Self Cite

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The effect of employing four different reactor models, Zeldovich-von Neumann-Döring (ZND), constant volume (CV), constant pressure (CP), and the Shock routine from Chemkin, to perform detonation relevant chemical modeling was assessed. The simulation results were compared in terms of characteristic length-scales and chemical analyses with four representative mixtures:The following conclusions were drawn: (i) CV and CP reactor models shorten the induction zone length and strengthen the energy release rate in most mixtures. In terms of chemical kinetics, the impact of CP and CV reactor models is quite limited for H 2 -O 2 -N 2 mixtures and H 2 -NO 2 /N 2 O 4 . However, the C2 branch is enhanced in CV and CP reactor models for C 3 H 8 -O 2 -N 2 mixture. Moreover, both reactor models weaken the intermediate-temperature chemistry and promote the high-temperature chemistry for DME-O 2 -CO 2 mixtures; (ii) the Shock module can be employed to perform detonation modeling, as it provided similar results to the ZND simulations for all investigated

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Effect of incident laser sheet orientation on the OH-PLIF imaging of detonations

Cited by 17 publications

References 22 publications

Validation of High Speed Reactive Flow Solver in OpenFOAM with Detailed Chemistry

Validation of High Speed Reactive Flow Solver in OpenFOAM with Detailed Chemistry

Evaluation of Detailed Reaction Models for the Modeling of Double Cellular Structures in Gaseous Nitromethane Detonation

Effect of the reactor model on steady detonation modeling

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