This study aims at evaluating the performance of three reaction models to reproduce cell size measurements obtained during nitromethane-oxygen and pure nitromethane detonations (π 1 = 383 β 390 K, π 1 = 20 β 100 kPa, and π = 0.2 β 1.75). The validation dataset is composed of 47 cell size measurements and includes conditions presenting both single (π 1 only) and double (π 1 and π 2 ) cellular structures. Zeldovich'-von Neumann-DΓΆring (ZND) simulations are employed to compute the cell size π (π π ) by utilizing the induction zone lengths (Ξ π,π ) and a correlation factor (π΄ π ), 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 (π 1 and π 2 ), Thus, an averaged correlation factor π΄ = 37 could be employed in future studies; (ii) qualitatively, all the models are underestimating π 1 in most of the conditions but are satisfactory reproducing π 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 π 2 /π 1 (near 5 in most conditions).
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