Development of a flashback correlation for burner-stabilized hydrogen-air premixed flames

Hydrogen for Cooking: A Review of Cooking Technologies, Renewable Hydrogen Systems and Techno-Economics

“…The study quantified the concept of a safety allowance to preserve the performance of the domestic burner. Even though there are experimental and numerical studies to understand and solve the flashback phenomenon [88][89][90][91][92][93][94][95][96][97][98], these studies are focused on large-scale and high-pressure burners, which highlights the need for studies on domestic burners. For instance, Vance, Goey, and Oijen [98] numerically studied the flashback limits of slit burners.…”

“…Even though there are experimental and numerical studies to understand and solve the flashback phenomenon [88][89][90][91][92][93][94][95][96][97][98], these studies are focused on large-scale and high-pressure burners, which highlights the need for studies on domestic burners. For instance, Vance, Goey, and Oijen [98] numerically studied the flashback limits of slit burners. They established that the traditional flashback association with the critical velocity gradient does not disintegrate the flashback data because it does not consider the stretch-induced superior diffusion effects.…”

Autoignition-induced flashback in hydrogen-enriched laminar premixed burners

“…However, this theory does not take into account additional phenomena that alter flame stabilization, such as flame stretch [29,30], preferential diffusion [31,32] and coupled heat exchange with the walls [33,34,35,36]. Preferential diffusion is especially relevant in the case of low Lewis number fuels such as H 2 [37,38,39], as recently shown by numerical flow simulations attempting to extend the critical velocity gradient theory for hydrogen flames stabilized on perforated plates [40]. One of the main outcomes is the importance of the Markstein length of these flames, found to be negative for lean hydrogen-air mixtures [41].…”

“…One of the main outcomes is the importance of the Markstein length of these flames, found to be negative for lean hydrogen-air mixtures [41]. Its impact on flame stabilization had to be taken into account to correctly predict flashback limits of flames stabilized on a flame-holder [42,43,40].…”

Dynamic stabilization of a hydrogen premixed flame in a narrow channel

“…where v is the local gas velocity, n is the flame normal vector computed for a scalar field of the reaction progress variable Y , S D,Y is the density weighted local flame displacement speed at a location corresponding to a Y iso-level and V f is the absolute speed of the flame front relative to the laboratory frame. In order to illustrate the unique stabilization behaviour of the hydrogen flame in contrast to methane flames, a typical hydrogen and a methane flame stabilized on a multi-slit burner are shown in Fig 1 . The geometrical setup is based on the recent study by Vance et al [8] with slit width W " 2 mm, distance between plates D " 1 mm and plate thickness t " 1 mm at ϕ " 0.7 for both flames. The burner temperature is kept constant at 700 K for both H 2 and CH 4 flames.…”