Intrinsic disturbed flame equations and stretched premixed flamelet model : two descriptions of premixed flame-flow interaction

Over the last few years, two new descriptions of flame-flow interaction have been developed independently, viz. the ’Intrinsic Disturbed Flame Equations’ (IDFE) and ’Stretched Premixed Flamelet Model’ (SPFM). Both descriptions employ a coordinate system attached to the flame. The conservation equations for a premixed flame are rewritten in this coordinate system, eventually resulting in a quasi one-dimensional system. We present applications in theory, numerics and data analysis. This includes burning velocity relations, stability and predictions of a triple flame. The description seems promising for turbulent combustion modellin

OPTIMISING ACOUSTIC RESONATORS FOR SONOFUSION EXPERIMENTS WITH EVOLUTIONARY ALGORITHMS

The sizing of simple resonators like guitar strings or laser mirrors is directly connected to the wavelength and represents no complex optimisation problem. This is not the case with liquid-filled acoustic resonators of non-trivial geometries, where several masses and stiffnesses of the structure and the fluid have to fit together. This creates a scenario of many competing and interacting resonances varying in relative strength and frequency when design parameters change. Hence, the resonator design involves a parameter-tuning problem with many local optima. As its solution evolutionary algorithms (EA) coupled to a forced-harmonic FE simulation are presented. A new hybrid EA is proposed and compared to two state-of-theart EAs based on selected test problems. The motivating background is the search for better resonators suitable for sonofusion experiments where extreme states of matter are sought in collapsing cavitation bubbles