This paper reports on a study of transient ignition and combustion of hydrogen/air mixtures by a heated, thin catalytic wire in a natural convection environment. Modeling of the process is accomplished via a reduced set of heterogeneous kinetic processes which include dissociative adsorption and desorption of both reactants, three fast surface reactions of the Langmiur-Hinshelwood type, and the...

Abstract To discuss P m variation law with t in large scale coal dust explosion equipment, shock wave pipe is used and a 60 linear test system built. of measured by flame collection system. ARIMA ( p,q,d ) time series analysis model built, differential methods are to eliminate upward trend the maximum length data. By calculating autocorrelation, partial correlation coefficient, value AIC SBC, a...

As the production process continues to be refined, biomass pyrolysis oils are increasingly being considered as potentially feasible renewable fuels. Combustion of pyrolysis oils in diesel engines has been scarcely studied, and the few studies which have been performed indicate that these fuels exhibit excessively long ignition delay, rendering them dependant on auxiliary ignition sources for di...

The details of ignition of Type Ia supernovae remain fuzzy, despite the importance of this input for any large-scale model of the final explosion. Here, we begin a process of understanding the ignition of these hotspots by examining the burning of one zone of material, and then investigate the ignition of a detonation due to rapid heating at single point. We numerically measure the ignition del...

The issue of spontaneous ignition of highly pressurized hydrogen release is of important safety concern, e.g. in the assessment of safety risk and design of safety measures. This paper reports on recent numerical investigation of this phenomenon through releases via a tube using a 5-order WENO scheme. A mixture-averaged multi-component approach was used for accurate calculation of molecular tra...

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 ...

Spontaneous ignition tests of various forest species were performed with a specifically designed apparatus. The forest species selected: Arbutus andrachne, Cistus incanus, Pinus brutia, Pinus halepensis, Cupressus sempervirens, Pistacia lentiscus, Abies cephalonica are very common in the Mediterranean region which is frequently devastated by forest fires. The same tests were performed in the pr...

Title of Document: PROBING THE IGNITION MECHANISM OF ALUMINUM NANOTHERMITES Snehaunshu Chowdhury, Ph.D., 2012 Directed By: Professor Michael R. Zachariah, Department of Mechanical Engineering, Chemistry and Biochemistry Nanothermites are defined as intimate mixtures of metal and metal oxidizer particles usually below 100 nm in diameter. They belong to a class of energetic materials which have b...

The paper shows a test results of single cylinder, direct injected, self ignited dual fuel engine. One has analysed a combustion parameters calculated on base of recorded indicator diagrams. The comparison included: the ignition delay period, the cylinder pressure, the rate of pressure rise, the average medium temperature, the heat release rate, the total combustion time and the indicated effic...