نتایج جستجو برای: flame temperature
تعداد نتایج: 466385 فیلتر نتایج به سال:
The laminar flame speed of Dimethyl Ether (DME)/air mixtures at room temperature and atmospheric pressure were determined experimentally over an extensive range of equivalence ratios, with and without 15% nitrogen dilution, using Particle Image Velocimetry (PIV) and a stagnation flame burner configuration. The laminar flame speeds were determined by linear extrapolation of the measured referenc...
In gasoline engines, pre-chamber spark ignition systems are used to achieve high efficiency and low NOx emissions when operating under lean conditions. While a cold pre-chamber spark plug can lead to misfiring and flame quenching under cold start or part load operation, a hot pre-chamber can result in uncontrolled pre-ignition phenomena under full load operation. This paper presents an approach...
Due to the increasing need for a more realistic analysis of flame, in this study, the premixed counter flow flames propagation in the uniform mixture of organic porous particles and air is studied. Because of size equality assumption of the porous particles, lycopodium particles at this research are assumed. This analysis framework is thermal-diffusion model with this assumption that the lewis...
The effects of dimethyl ether (DME) addition on the high temperature ignition and burning properties of methane-air mixtures were studied experimentally and numerically. The results showed that for a homogeneous system, a small amount of DME addition to methane resulted in a significant reduction in the high temperature ignition delay. The ignition enhancement effect by DME addition was found t...
In this thesis, thermal-diffusive instabilities are studied experimentally in diffusion flames. The novel species injector of a recently developed research burner, consisting of an array of hypodermic needles, which allows to produce quasi one-dimensional unstrained diffusion flames has been improved. It is used in a new symmetric design with fuel and oxidizer injected through needle arrays whi...
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...
Combustion kinetics ...................................................................................................................................... 1 Physical mixing and its effects on ignition, propagation and extinction ...................................................... 2 Mixing ...........................................................................................................
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