Physicists from Russia learned to burn diluted gasoline

© Photo : Boris Chechevitsa Korshunov, Boris Kichatov, Alex Kaverin, Ivan YakovenkoPhysicists from Russia learned to burn diluted gasoline© Photo : Boris Techtopics to daily updates RIA Science

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. Russian physicists saw as the foam burns a mixture of gasoline and water, and figured out how to manage this process for use in internal combustion engines. Their findings were presented in the journal Proceedings of the Combustion Institute.

«We’ve never simultaneously measured the flame speed and the pressure distribution inside the tube during the combustion of the foamed emulsion. We believe the acceleration of the flame and detonation of an emulsion are associated with the explosive boiling of the liquid phase of the system,» says Boris Kichatov of the joint Institute for high temperatures, Russian Academy of Sciences in Moscow, whose words the press service of the Russian science Foundation.

As is well known to all ordinary people, had to deal with furnaces or machines, wet wood and gasoline, diluted with water or other nonflammable liquids, very poorly lit, so you cannot use them for heating or power engines.

On the other hand, recently scientists have found that a foamed emulsion consisting of water, soap and analogues of hydrocarbons, can be used as fuel. Past experiments shows that by burning under certain conditions can be emulsions with water content up to 95%. The water significantly lowers the price and increases the sustainability of foamed emulsions compared to traditional fuels.

Kichatov and his colleagues attempted to apply this theory to practice, exploring the nature of the combustion of such mixtures, consisting of water and various components of gasoline, diesel fuel and kerosene. Mixing them in different proportions and varying sizes of bubbles in the emulsion, the scientists watched how to change the character of the combustion of such mixtures and find out how they can safely burn.

As shown by these experiments, these mixtures burn well enough even in those cases, if they are almost half composed of water. Interestingly, this can happen in two ways – in the «slow» combustion, when the flame spreads through the mixture of quiet and explosive fast ignition.

Trying to figure out why this is happening, scientists have tracked the movement of the individual components of such emulsions inside the experimental engine, illuminating them with a laser. It was found that the rate of combustion of such mixtures is strongly influenced by what size have drops of water arising from the disintegration of the foam when it is heated.

The more the droplets, the slower and more stable burned emulsion, whereas a smaller droplet sizes and under some other conditions, it ignited explosively. The droplet size, in turn, depended on how quickly the fire spread on the mixture.

In addition, the Flammability of these foams depended on the mass of hydrocarbons used in their manufacture. When exceeding a certain limit, for example, when using tridecane, one of the components of diesel fuel, such mixture was not light even with minimal water content.

As scientists hope that the data gathered by them will help to create engines capable of burning similar compounds that reduce the emissions of carbon dioxide and other harmful substances into the atmosphere and increase the efficiency of cars and industrial enterprises.

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