Underground Coal Gasification (UCG) is thought to be the most favourable clean coal technology option from geological-engineering-environmental viewpoint (less polluting and high efficiency) for extracting energy without digging it out or burning on surface. UCG process requires only injecting oxidizing agent (O2 air with steam) as raw material, into buried seam, at an effective ratio which reg...

Large-eddy simulation of a jet flame in a hot diluted coflow has been performed. The burner under consideration was operated in the moderate and intense low oxygen dilution (MILD) combustion regime, and utilizes a three-stream feed system to supply fuel, diluted coflow, and air to the burner (Dally, B. B., Karpetis, A. N., and Barlow, R. S., Proc. Combust. Inst., Vol. 29, 2002, pp. 1147–1154). ...

Extreme weather often contributes to crown fires, where the fire spreads from one tree crown to the next as a series of piloted ignitions. An important aspect in predicting crown fires is understanding the ignition of fuel particles. The ignition criterion considered in this work is the critical mass flux criterion – that a sufficient amount of pyrolysis gases must be generated for a diffusion ...

Non-equilibrium plasmas may be used to dissociate reactants into radicals. In turn, these radicals react releasing energy and broadening the radical pool and thereby ignite or aid the ignition of a fuel=air mixture. Using methane as an archetypical fuel, this work studies the kinetic pathways that control homogeneous ignition in the presence of radicals, which were previously formed by external...

Experimentation about alternative fuels started mostly after the oil crisis of 1980’s to 1990’s after the World War II. In order to reduce the use of petroleum product which are limited in nature, the idea of alternative fuels was developed. In this paper an attempt has been made to investigate the engine performance in a four stroke single cylinder water cooled diesel engine using pure diesel ...

A novel velocimetry technique to probe the exhaust flow of a laboratory scale combustor is being developed. The technique combines the advantages of standard particle velocimetry techniques and the ultra-fast imaging capabilities of a streak camera to probe high speed flows near continuously with improved spatial and velocity resolution. This “Particle Streak Velocimetry” technique tracks laser...

A noble low NOx combustion technology, based on partial oxidation combustion concept in a fuel rich combustion zone, is successfully applied in this research. The burner is designed such that a portion of fuel is heated and pre-vaporized in the furnace then injected into a fuel rich combustion zone so that a partial oxidation reaction occurs. The effects of equivalence ratio, thermal load, and ...

The combustion characteristics of a staged cycle engine with an oxidizer-rich preburner were experimentally studied at different momentum ratios multi-element injectors. Propellants simultaneously supplied as liquid–liquid–liquid system, and injector was designed in which swirl coaxial jet is sprayed. burned the propellants inner chamber had temperature greater than 2000 K. To cool gas, liquid ...

Nowadays, the major challenge of diesel engines development is simultaneous nitrogen oxides and soot emissions reduction without the thermal efficiency drop. Hence, different combustion concepts should be investigated to reach optimum emission and performance conditions in diesel engines without expensive aftertreatment systems. This paper presents the results of a study on a dual fuel (DF) eng...