Analytical studies of the dynamics of gaseous detonations.

Determination of the Equilibrium Parameters of Gaseous Detonations Using a Genetic Algorithm

The present work is concerned with the development of a new algorithm for determination of the equilibrium composition of gaseous detonations. The elements balance equations, and the second law of thermodynamics (i.e., the minimization of the Gibbs free energy of products), are used to determine the equilibrium composition of the detonation products. To minimize the Gibbs free energy with tradi...

Numerical study of the effect of fuel injection timing on the ignition delay, performance parameters and exhaust emission of gas/dual fuel diesel engine using Computational Fluid Dynamics

Today, due to the various usage of compression ignition engines in urban transportation, as well as the need to reduce exhaust emissions and control fuel consumption, the use of alternative fuels has become common in diesel engines. Gaseous fuel is one of the most common alternative fuels that can be used in diesel engines. The utilization of alternative fuels in compression ignition engines re...

High resolution GPU-based flow simulation of the gaseous methane-oxygen detonation structure

A gaseous detonation is a combustion-driven, compressible wave propagating at supersonic speeds. Experimental visualizations and numerical simulations confirm that detonation waves have a complex, multi-dimensional, cellular structure generated by various gasdynamic interactions (Ohyagi et al. 2000; Ng and Zhang 2012). Except in special combustible mixtures (such as argon-diluted mixtures) with...

Hydrodynamic Instabilities in Gaseous Detonations: Comparison of Euler, Navier–Stokes, and Large-Eddy Simulation

Analytic and computational studies on micro-propulsion and micro-detonics

Based on a general theory of detonation waves with an embedded sonic locus that we have previously developed, we carry out asymptotic analysis of weakly curved slowly varying detonation waves and show that the theory predicts the phenomenon of detonation ignition and failure. The analysis is not restricted to near ChapmanJouguet detonation speeds and is capable of predicting quasi-steady, norma...