Results 141 to 150 of about 3,874 (192)
Some of the next articles are maybe not open access.
Turbulent Flame Speeds of Premixed Supersonic Flame Kernels
Flow, Turbulence and Combustion, 2018It is unclear whether turbulent flame speed scalings established in low speed regimes are applicable to supersonic flames. To investigate this question, the canonical flame kernel is investigated in a scramjet-like channel having a one degree wall divergence. The growth, shape and internal kernel dynamics are investigated.
Bradley A. Ochs +3 more
openaire +1 more source
Form Kernel P Systems to X-Machines and Flame
J. Autom. Lang. Comb., 2014Kernel P systems have been introduced with the aim of unifying different variants of P systems. They provide a coherent framework for specifying and solving a broad spectrum of problems. The tools built so far have aimed to formally verify systems modelled as kernel P systems, but the simulators obtained are not very efficient.
Niculescu, I.M. +3 more
openaire +3 more sources
Theoretical analysis of the evolution from ignition kernel to flame ball and planar flame
Combustion Theory and Modelling, 2006Dynamics of flame kernel evolution with and without external energy addition has been investigated analytically and numerically. Emphasis is placed on the effects of radiation heat loss, ignition power and Lewis number on the correlation and transition between the initial flame kernel, the self-extinguishing flame, the flame ball, the outwardly ...
Zheng Chen, Yiguang Ju
openaire +1 more source
Experimental study of turbulent flame kernel propagation
Experimental Thermal and Fluid Science, 2008Flame kernels in spark ignited combustion systems dominate the flame propagation and combustion stability and performance. They are likely controlled by the spark energy, flow field and mixing field. The aim of the present work is to experimentally investigate the structure and propagation of the flame kernel in turbulent premixed methane flow using ...
Mohy S Mansour, Norbert Peters
exaly +2 more sources
The Effects of Initial Flame Kernel Conditions on Flame Development in SI Engine
SAE Technical Paper Series, 1991<div class="htmlview paragraph">The initial flame kernel behavior in a SI engine was measured by a spark-plug-fiber-optics probe. From these measurements, the flame kernel may be characterized by an expansion speed and a convection velocity. These quantities were correlated with the bum rate on a cycle-to-cycle basis in an engine configurated ...
Yvan Bianco +2 more
openaire +1 more source
Curvature effects on flame kernels in a turbulent environment
Proceedings of the Combustion Institute, 2002This paper presents results from the direct numerical simulation (DNS) of flame kernels in various turbulent environments. The flames are fully premixed and propagate through a field of decaying isotropic turbulence. The DNS code solves the fully compressible reacting flow equations using high-order explicit finite differences in space and a third ...
K.W. Jenkins, R.S. Cant
openaire +1 more source
Flame Kernel Development in a Methanol Fueled Engine
SAE Technical Paper Series, 1993<div class="htmlview paragraph">The combustion behavior in a modem 4-valve engine using a broad range of methanol/gasoline fuel mixtures was studied. The initial flame development was examined by using a spark plug fiber optics probe. Approximately, the kernel expansion speed, S<sub>g</sub>, is relatively unchanged from M0 to M40 ...
Peter C. Hinze, Wai K. Cheng
openaire +1 more source
Analysis of Premixed Turbulent Spherical Flame Kernels
2007The present study discusses results from a number of DNS simulations of turbulent flame kernels. The description of the chemistry in these calculations was based on the Flamelet Generated Manifolds (FGM) technique. The differences are imposed by varying the turbulence intensity and length scale within the thin reaction zones regime.
Bastiaans, R.J.M. +3 more
openaire +2 more sources
A Fractal Model of Turbulent Flame Kernel Growth
SAE Technical Paper Series, 1990<div class="htmlview paragraph">A model of turbulent flame kernel growth has been developed based on the fractal nature of premixed turbulent flame structure. The flame kernel model uses a recently developed heuristic model for the fractal dimension of premixed turbulent flame surfaces in order to predict the flame kernel's structure. The fractal
Domenic A. Santavicca +2 more
openaire +1 more source
Spark Discharge Induced Flame Kernel Growth
Fluids Engineering, 2000Abstract An intuitive study of the growth of a flame kernel immediately following a spark discharge is presented. It is shown that the radius of the flame kernel, R grows with time, t as R ∼ ( Δ E ρ o ) 1 / 5 t 1 / 5 where ΔE is the integrated energy (∫ Edt) deposited by the spark discharge and ρo is the initial ambient density.
Vedat Arpaci +2 more
openaire +1 more source