-Theoretical and experimental studies dealing with the spray ignition phenomena are reviewed. Two major topics covered are external-source ignition of liquid fuel sprays and spontaneous spray ignition. Experimental and theoretical investigations of external-source ignition of sprays employing different configurations are discussed first. Three major topics included here are: (i) ignition of qui...

In this paper, a stochastic flamelet approach is used to model autoignition in an initially non-premixed medium in isotropic and decaying turbulence, using a one-step irreversible reaction. This configuration corresponds to the DNS data from Sreedhara and Lakshmisha [Proc. Combust. Inst. 29 (2002) 2069]. The system can be described by the flamelet equations for the temperature and fuel mass fra...

0016-2361/$ see front matter 2011 Elsevier Ltd. A doi:10.1016/j.fuel.2011.10.035 ⇑ Corresponding author. Tel.: +1 9372558781. E-mail address: [email protected] (V.R. Katta). Computational fluid dynamics (CFDs)-based predictions are presented for nonpremixed and partially premixed flames burning vaporized n-heptane fuel. Three state-of-the-art chemical kinetics models are incorporated into a tim...

Three-dimensional time-dependent CFD simulations of autoignition and emissions are reported for an idealized engine configuration under HCCI-like operating conditions. The emphasis is on NOx emissions. Detailed NOx chemistry is integrated with skeletal autoignition mechanisms for n-heptane and iso-octane fuels. A storage/retrieval scheme is used to accelerate the computation of chemical source ...

Wildfires are global issues that cause severe damages to the society and environment. Wood particles firebrands most common fuels in wildfires, but size effect on flaming smoldering ignitions as well subsequent burning behavior is still poorly understood. In this work, a well-controlled experiment was performed investigate of stationary disc-shaped wood with different diameters (25–60 mm) thick...

Ignition delay times (IDT) for stoichiometric propane (C 3 H 8 ) diluted with nitrogen were measured in a shock tube facility under reflected wave conditions at pressures ranging from 1 to 10 atm and temperatures between 850 1500 K. The experiments limited maximum pressure of due the facility’s constraints. In addition, numerical simulations conducted using several detailed kinetic mechanisms 3...

Autoignition-assisted nonpremixed cool flames of diethyl ether (DEE) are investigated in both laminar counterflow and turbulent jet flame configurations. First, the ignition extinction limits diluted DEE measured simulated using detailed kinetic models. The measurements used to validate models guide measurements. results show that, below a critical mixture condition, for elevated temperature di...

The demand for petroleum-derived gasoline in the transportation sector is on rise. For better knowledge of combustion practical systems, this study presents experimental measurements and numerical prediction autoignition temperatures extinction limits six FACE (fuels advanced engines) fuels counterflow flames. Extinction were measured at atmospheric pressures while experiments carried out high ...

NOx and soot emissions remain critical issues in diesel engines. One method to address these problems is to achieve homogeneous combustion at lower peak temperatures – the goal of research on controlled autoignition. In this paper n-heptane is used to represent a large hydrocarbon fuel and some of the effects of internal and external EGR, oxygen concentration, and engine speed on its combustion...