The effects of turbulent integral length scale to flame thickness ratio on the bending effect burning velocity variation have been analysed based a three-dimensional Direct Numerical Simulation database statistically planar premixed flames with characteristic Lewis number unity propagating into forced unburned gas turbulence. It has demonstrated that Damköhler's first hypothesis remains valid f...

We utilized gas-phase diffusion flame synthesis, which has potential for large-scale production of metal oxide nanoparticles, to produce iron oxide nanoparticles (IONPs) with variable oxidation states. The efficacy of these materials in removal of arsenate (As(V) ) from water was assessed. Two different flame configurations, a diffusion flame (DF) and an inverse diffusion flame (IDF), were empl...

Abstract In this study, the optical diagnostics techniques of infrared (IR) absorption and chemiluminescence were applied to a racing engine. A small M5 IR sensor and Cassegrain optics sensors were developed to measure in-cylinder fuel concentrations and local chemiluminescence intensities. The small IR sensor was able to withstand racing engine operating conditions up to 16,000 rpm and exhibit...

An improved spark ignition model has been developed and implemented into the KIVA-3V code. In this model, the spark ignition kernel growth is tracked by Lagrangian particle markers. The effects of turbulent flow and spark discharge energy on the kernel growth are considered. After the ignition kernel size exceeds a critical size related to the integral turbulent length scale of the flow, the tu...

Modern high speed aerospace propulsion relies on the development of scramjet engines significantly. Design of a supersonic combustor involves the potential problems of proper mixing, flame holding as well as flame stabilization within the very short period. Many techniques were introduced to overcome these problems, of which cavity flame holders has evolved as one of the prominent among them. T...

Numerous studies have used ground-based, freely falling, isolated droplets to study the combustion behavior of liquid fuels, fuel emulsions, and liquid-solid slurries (Sangiovanni and Labowsky, Combust. Flame, 1982; Choi et al, 23rd Symp. (Int’l.) on Comb., 1990; Lee and Law, Comb. Sci. Tech., 1992). Droplets of mono-disperse size formed repetitively are projected down a duct flow oriented para...

Computational fluid dynamics based solvers have been developed for explosion modeling in hazards analysis. These include a numerical approach to simulate flame acceleration and deflagration to detonation transition in hydrogen-air mixture and two detonation solvers. The former solves fully compressible, multidimensional, transient, reactive Navier–Stokes equations with a chemical reaction mecha...