A model for autoignition in turbulent jets

The hydrodynamic structure of a free round turbulent jet of fuel (ethanol/water mixture) and oxidizer (air), injected into an ambient of supercritical water at rest (left) and at the instance of spontaneous autoignition of the hydrothermal flame (right). The images were taken in the high-pressure combustion laboratory at NASA’s Glenn Research Center in Cleveland, Ohio.…