Why does the detonation cell size λ provide quasi-universal scaling of detonation dynamics?
Abstract
The detonation cell size λ is known to provide a characteristic scale for the detonation dynamics and serves as scaling parameter for numerous correlations with other dynamic parameters of detonations, e.g., the critical detonation tube diameter for transmission to open space of d≃13λ across many reactive systems. In the present paper, we address the reason why such scaling works so well. We formulate a macroscopic reaction rate model for cellular detonations relying on the distribution of ignition delays in cellular detonations, conditioned by λ. The ignition delay distribution is modeled in terms of the cellular dynamics, using the closed form model recently proposed by Radulescu (JFM 2025) for the lead shock dynamics in a unit cell. The distribution of ignition delays obtained in closed form serves as a simple model for the phase-averaged reaction rate in a cell-averaged description. The global reaction rate model is applied to the problem of globally curved cellular detonations. Excellent agreement with experiment is obtained. The paper thus highlights for the first time a simple dynamic closure for cellular detonations and provides the simple answer why the cell size provides the relevant length scale for detonations: it provides the length of the mean detonation structure, or its hydrodynamic thickness.
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BibTeX
@misc{radulescu2026does,
title = {{Why does the detonation cell size $λ$ provide quasi-universal scaling of detonation dynamics?}},
author = {Matei Ioan Radulescu},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.38033},
eprint = {2610.38033},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.38033},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Why does the detonation cell size λ provide quasi-universal scaling of detonation dynamics?
AU - Matei Ioan Radulescu
PY - 2026
DA - 2026/10/27
PB - arXiv
DO - 10.48550/arxiv.2610.38033
UR - https://arxiv.org/abs/2610.38033
AB - The detonation cell size λ is known to provide a characteristic scale for the detonation dynamics and serves as scaling parameter for numerous correlations with other dynamic parameters of detonations, e.g., the critical detonation tube diameter for transmission to open space of d≃13λ across many reactive systems. In the present paper, we address the reason why such scaling works so well. We formulate a macroscopic reaction rate model for cellular detonations relying on the distribution of ignition delays in cellular detonations, conditioned by λ. The ignition delay distribution is modeled in terms of the cellular dynamics, using the closed form model recently proposed by Radulescu (JFM 2025) for the lead shock dynamics in a unit cell. The distribution of ignition delays obtained in closed form serves as a simple model for the phase-averaged reaction rate in a cell-averaged description. The global reaction rate model is applied to the problem of globally curved cellular detonations. Excellent agreement with experiment is obtained. The paper thus highlights for the first time a simple dynamic closure for cellular detonations and provides the simple answer why the cell size provides the relevant length scale for detonations: it provides the length of the mean detonation structure, or its hydrodynamic thickness.
ER -