We present a model that simulates the conventional tube-furnace experiment used for ignition studies. The Distributed Activation Energy Model of Ignition accounts for particle-to-particle variations in reactivity by having a single preexponential factor and a Gaussian distribution of activation energies among the particles. The results show that the model captures the key experimental observati...

Experimental data were acquired for: (1) the ignition temperatures of nitrogen–diluted ethylene and propylene by counterflowing heated air for various strain rates and system pressures up to 7 atm; (2) the laminar flame speeds of mixtures of air with acetylene, ethylene, ethane, propylene, and propane, deduced from an outwardly propagating spherical flame in a constant-pressure chamber, for ext...

Engine performance depends on two main factors of engine speed and ignition time. Ignition timing can affect engine life, fuel economy and engine power. In this paper, to study engine performance of Peugeot 206 TU3A with comparison ratio of 10.5:1 and displacement of 1361CC in MATLAB software, a two-zone burned/unburned model with the fuel burning rate described by aWiebe function was used for ...

Flame ignition by short-duration (≈ 50 ns) transient plasma, or corona, discharges was investigated for methane-air, propane-air and butane-air mixtures at atmospheric and elevated pressures. Such discharges produce a larger fraction of high-energy electrons, yield more spatially distributed energy and deposit energy in the gas more efficiently than conventional arc discharges do. We show that ...

This study reports the application of a novel, high speed laser-detector system for the time-resolved study of flame propagation in a well-controlled spark ignition system. The ignition system allowed full and reproducible control over the energy deposited during breakdown and the ensuing arc discharge of the spark plasma. Ignition was performed in a closed vessel which was filled with stoichio...

An important step in the U.S. inertial fusion effort toward demonstrating ignition and modest gain in the laboratory is the validation of high-performance direct-drive fusion capsules. The scientific program at uR/LLE1 is aimed at studying nearignition conditions in direct-drive capsules that achieve ion temperatures of 2 to 3 keV and fuel areal densities of 0.2 g/cm2. Such capsules are expecte...

This study aims at modeling the effect of incoming heat flux fluctuations on solid material ignition. In order to propose a general methodology that can be applied to any kind of solid target, kernels accounting for the target temperature response regarding an incoming heat flux are developed for thermally thick and thin solids with low or high thermal inertia. The expected behavior of these di...

LLE Review, Volume 134 127 Introduction The cone-guided scheme for fast-ignition inertial confinement fusion (ICF)1,2 provides the potential of higher gains at lower total driver energy than conventional central hot-spot–ignition schemes. In this scheme, a spherical target with a hollow gold cone attached is first compressed by laser beams outside the cone and then ignited by a petawatt (PW) sh...

0010-938X/$ see front matter 2011 Elsevier Ltd. A doi:10.1016/j.corsci.2011.10.014 ⇑ Corresponding author. Tel.: +61 7 3365 3748. E-mail address: [email protected] (A. Atre The influence of alloying on the ignition and flammability was studied. One end of a cylindrical specimen was exposed to a free diffusion flame. Ignition required at least partial melting. Burning extinguished once th...