Radiation preheating can trigger transition from deflagration to detonation

TL;DR

This paper investigates how radiation preheating of unburnt mixtures by a propagating deflagration front can create temperature gradients that trigger a transition from deflagration to detonation, supported by numerical simulations.

Contribution

It introduces a novel mechanism where radiation preheating induces temperature gradients, potentially causing deflagration to detonation transition, validated through simplified numerical modeling.

Findings

Radiation preheating can significantly raise unburnt mixture temperatures.

Temperature gradients from radiation can promote deflagration to detonation transition.

Numerical simulations support the plausibility of this transition mechanism.

Abstract

In this article effect of radiation preheating of unburnt mixture by propagating deflagration front is studied from the viewpoint of its ability to form a promoting temperature gradient and trigger transition to detonation. First, we investigate the effect of radiation preheating of the unburnt mixtures, when they are traveling through the wrinkles on the flame surface, in order to estimate a possibility of significant temperature rise. Subsequently, numerical simulations of a simplified mathematical model are carried out. They demonstrate plausibility of the proposed mechanism of the deflagration to detonation transition.