Engineered timber is an innovative and sustainable construction material, but its uptake has been hindered by concerns about its performance in fire. Current building regulations measure the fire performance of timber using fire resistance tests. In these tests, the charring rate is measured under a series of heat exposures (design fires) and from ...
The present work quantifies the impact of fuel chemistry on burning modes using premixed dimethyl ether (DME), ethanol (EtOH) and methane flames in a back-to-burnt opposed jet configuration. The study considers equivalence ratios 0 ≤ Φ ≤ 1, resulting in a Damköhler (Da) number range 0.06 ≤ Da ≤ 5.1. Multi-scale turbulence (Re ≃ 19,550 and Ret ≃ 360...
In this work, the energetic Al/CuO nano-thermite is chosen as a promising additive to improve the reaction characteristic of mu Al powder in heated steam at 600-900 degrees C. The ignition temperature, ignition delay time, and combustion efficiency were experimentally measured. After all the reaction products were collected, the surface morphologie...
In this work, the energetic Al/CuO nano-thermite is chosen as a promising additive to improve the reaction characteristic of mu Al powder in heated steam at 600-900 degrees C. The ignition temperature, ignition delay time, and combustion efficiency were experimentally measured. After all the reaction products were collected, the surface morphologie...
Pyrolysis is a key process in all stages of wood burning from ignition to extinction. Understanding each stage is crucial to tackle wildfires and assess the fire safety of timber buildings. A model of appropriate complexity of wood pyrolysis and oxidation is missing, which limits the understanding of fires fuelled by wood. Progress towards this aim...
The stable operation of low-temperature combustion processes is an open challenge, due to the presence of undesired deviations from steady-state conditions: among them, oscillatory behaviors have been raising significant interest. In this work, the establishment of limit cycles during the combustion of hydrocarbons in a wellstirred reactor was anal...
We present simulations of ignition and burn based on the Highfoot and high-density carbon indirect drive designs of the National Ignition Facility for three regimes of alpha-heating—self-heating, robust ignition and propagating burn—exploring hotspot power balance, perturbations and hydrodynamic scaling. A Monte-Carlo particle-in-cell charged parti...
A suite of synthetic nuclear diagnostics has been developed to post-process radiation hydrodynamics simulations performed with the code Chimera. These provide experimental observables based on simulated capsule properties and are used to assess alternative experimental and data analysis techniques. These diagnostics include neutron spectroscopy, pr...
In this proof of concept study, the Bronsted acidic ionic liquids with NO3- and [B6H7](-)-based anions ignited spontaneously upon contact, suggesting a possible route to replace the combinations of a HNO3 (or N2O4) oxidizer and hydrazine-based fuel as bipropellants.
In this proof of concept study, the Bronsted acidic ionic liquids with NO3- and [B6H7](-)-based anions ignited spontaneously upon contact, suggesting a possible route to replace the combinations of a HNO3 (or N2O4) oxidizer and hydrazine-based fuel as bipropellants.
