The propagation of an isobaric premixed flame into a quiescent gas mixture fuel and oxidizer contained between two parallel plates is investigated numerically. are separated by small distance h considered as adiabatic. assumed to be lean in the combustion model includes single-step Arrhenius-type reaction, constant heat capacity unity Lewis number. Transport properties temperature dependent or ...

A pulsed plasma source is used to stabilize lean premixed methane flames. Nitric oxide (NO) production is measured using probe sampling and chemiluminescence analysis. While the discharge is a potential source of NO, it is observed that the flame also consumes some NO. The NO production in the flame is modeled by use of a modified opposed diffusion flame simulation (OPPDIF), augmented by the in...

This paper examines the use of plasma discharges in flame stabilization. Three different types of plasma discharges are applied to a lifted jet diffusion flame in a coflow configuration, and evaluated for their abilities to enhance flame stabilization. A single electrode corona discharge (SECD) between a platinum electrode and the flame base is found to maintain the flame at a 20% higher coflow...

We develop and calibrate a realistic model flame for hydrodynamical simulations of deflagrations in white dwarf (Type Ia) supernovae. Our flame model builds on the advection-diffusion-reaction model of Khokhlov and includes electron screening and Coulomb corrections to the equation of state in a self-consistent way. We calibrate this model flame—its energetics and timescales for energy release ...

The mechanism of flame propagation in fuel beds of wildland fires is important to understand in order to quantify fire spread rates. Fires spread by radiative and convective heating and often require direct flame contact to achieve ignition. The flame interface in an advancing fire is unsteady and turbulent, making study of intermittent flames in complex fuels difficult. A vertical wall fire, i...

Adiabatic quantum algorithms represent a promising approach to universal quantum computation. In isolated systems, a key limitation to such algorithms is the presence of avoided level crossings, where gaps become extremely small. In open quantum systems, the fundamental robustness of adiabatic algorithms remains unresolved. Here, we study the dynamics near an avoided level crossing associated w...

The numerical analysis of MHD-free convective heat transfer and its interaction with the radiation over a heated flame inside porous semicircular cavity loaded SWCNTs–water nanofluid was explored for very first time in present work. two circular arcs upper wall enclosure were preserved at constant cold temperature, whereas middle region it considered adiabatic. midland lower partially, while ot...

Title of Document: HOMOGENEOUS AND HETEROGENEOUS SENSORS FOR COMBUSTION SYSTEMS Amir Eshaghi, PhD, 2012 Directed By: Distinguished University Professor, Professor Ashwani K. Gupta, Department of Mechanical Engineering Due to increasingly stringent emission regulations, it is important to develop clean combustors. Combustion behavior is very complex in almost all practical power plant systems. M...

A linear stability of freely propagating, adiabatic premixed flames is investigated in the context of a thermal-diffusive or constant density model, together with a simple two-step chainbranching model of the chemistry. This study considers the case of realistic, finite activation energy of the chain-branching step, and emphasis is on comparing with previous high activation energy asymptotic re...

Abstract Adiabatic laminar burning velocities and post-flame NO mole fractions for neat blended ethanol n-heptane premixed flames were experimentally determined using a heat flux burner laser-induced fluorescence. The stabilized at atmospheric pressure an initial temperature of 338 K, over equivalence ratios ranging from 0.6 to 1.5. These experiments are essential the development, validation op...