Imaging Fourier-transform spectrometer measurements of a turbulent nonpremixed jet flame.

High-Repetition Rate Measurements of Temperature and Thermal Dissipation in a Nonpremixed Turbulent Jet Flame

Characteristics of Turbulent Nonpremixed Jet-flames and Jet-flames in Crossflow in Normal- and Low-gravity

It is well known that buoyancy has a major influence on the flow structure of turbulent nonpremixed jet flames. For example, previous studies have shown that transitional and turbulent jet flames exhibit flame lengths that are as much as a factor of two longer in microgravity than in normal gravity. The objective of this study is to extend these previous studies by investigating both mean and f...

Simultaneous CH planar laser-induced fluorescence and particle imaging velocimetry in turbulent nonpremixed flames

We report the simultaneous measurement of the flamefront location, using single-shot CH planar laserinduced fluorescence (PLIF), and the velocity field, using two-color digital particle imaging velocimetry (PIV), in nonpremixed turbulent flames. To minimize the influence of particle scattering on the CH PLIF images, we pump a CH B-X(0,0) transition at 390 nm and detect A-X fluorescence at 420–4...

Evaluation of a Scalar Probability Density Function Approach for Turbulent Jet Nonpremixed Flames

A scalar probability density function (PDF) method considering a detailed chemical kinetics is applied to a diluted hydrogen turbulent jet nonpremixed flame to evaluate the performance. The flame is formed on a nozzle of an inner diameter of D=6mm, with a fuel exit velocity of 30m/s, surrounded by two annular pipes issuing airs of higher and lower velocities of 30m/s and 3m/s, respectively. The...

Terascale direct numerical simulations of turbulent combustion — fundamental understanding towards predictive models

Advances in high-performance computational capabilities enable scientific simulations with increasingly realistic physical representations. This situation is especially true of turbulent combustion involving multiscale interactions between turbulent flow, complex chemical reaction, and scalar transport. A fundamental understanding of combustion processes is crucial to the development and optimi...