Lagrangian PDF investigations are performed of the Sandia piloted flame E and the Cabra H2/N2 lifted flame to help develop a deeper understanding of local extinction, re-ignition and auto-ignition in these flames, and of the PDF models’ abilities to represent these phenomena. Lagrangian particle time series are extracted from the PDF model calculations and are analyzed. In the analysis of the r...

A single phased Y-type hexagonal ferrite Sr2Co1.7Mg0.3Fe11.2Sn0.4Zn0.4O22 was synthesized by the sol–gel auto combustion method. Structural and magnetic properties of this composition of Y-type hexagonal ferrite have been investigated. The X-ray diffraction (XRD) patterns confirm single phase Y-type hexagonal ferrite and various parameters such as lattice constants and cell volume have been cal...

The alternative HCCI combustion mode presents a possible means for decreasing the pollution with respect to the conventional gasoline or diesel engines, while maintaining the efficiency of a diesel engine or even increasing it. This paper investigates the possibility of using gasoline in an HCCI engine and analyses the auto-ignition of gasoline in such an engine. The compression ratio that has ...

This dissertation: (i) develops a novel numerical method for DNS/LES of compressible, turbulent reacting flows, (ii) performs several validation simulations, (iii) studies auto–ignition of a hydrogen vortex ring in air and (iv) studies a hydrogen/air turbulent diffusion flame. The numerical method is spatially non-dissipative, implicit and applicable over a range of Mach numbers. The compressib...

in this paper, labo3 perovskite type catalyst formulations were prepared by sol-gel auto combustion method using citric acid as the fuel. activity of catalysts was tested in catalytic oxidation of toluene as a model of volatile organic compounds. lacoo3 perovskite formulation showed the highest activity among labo3 (fe, mn and co) perovskite catalysts. so, lacoo3 perovskite based catalyst was s...

Visible light-driven photocatalyst BiFeO3 (BFO) nanoparticles were synthesised by the auto-combustion method. The honey was used to fuel auto combustion method synthesise BFO nanoparticles. structural, optical and morphological activities of bismuth loaded characterised X-ray diffraction (XRD), FTIR, UV, photoluminescence (PL) SEM analysis, respectively. content modifies lattice parameters XRD ...

Abstract The demand for clean water free of pollution has become an urgent priority humanity. Gd 2 Zr O 7 nanoparticles were successfully synthesized via sol–gel auto combustion as a type pyrochlore to be used in the dye phytoremediation using Fenton-like approach. have been prepared auto-combustion strategy. annealing process was performed furnace at 1100 °C h form defect-fluorite structured w...

homogenous charge compression ignition (hcci) is a mode of combustion in ic engines in which premixed fuel and air are ignited spontaneously. there is a belief that hcci engines have a great potential to improve fuel consumption and reduce nox emissions. in this study, a single zone, zero dimensional, thermo-kinetic model has been developed and a computer program with matlab software is used to...

The renewed interest in high-speed flight has recently demonstrated the need for the development of hypersonic air-breathing propulsion systems, i.e., in which the ambient air is used as oxidizer. These systems have long been recognized as the most well-suited for hypersonic propulsion. Although a traditional ramjet is most appropriate for supersonic speeds (Mach 3 to 5), hypersonic speeds (Mac...

Abstract The occurrence of knocking combustion is limiting the efficiency modern spark ignition engine operation. Thus, an understanding processes at knock limit required for further optimization process. In this work, a multicomponent Toluene Reference Fuel (TRF) in single-cylinder research investigated under conditions. fuel exhibits negative temperature coefficient (NTC) regime thermodynamic...