Diesel spray interaction with highly porous structures for supporting of liquid distribution in space and its vaporization

The Role of Porous Media in Homogenization of High Pressure Diesel Fuel Spray Combustion

“…The inñuence of the PM on reducing the pressure is consistent with the thermodynamic parameters investigation of Weclas [14]. Comparing the temperature traces after SOI, a significant reduction was observed in the case of PM relative to the free spray with the largest difference observed at r = 20 ms and Tsoi = 1300 K. This result is consistent with the results of other studies [13-15].…”

“…Comparing the temperature traces after SOI, a significant reduction was observed in the case of PM relative to the free spray with the largest difference observed at r = 20 ms and Tsoi = 1300 K. This result is consistent with the results of other studies [13-15]. Reduced temperature for the PM cases is thought to rise from large heat capacity of the reactor and effective heat transfer (heat accumulation) in the porous ceramic [14,31]. Figure 18 presents (a) the calculated cumulative gross heat release and gross heat release rate and (b) net heat release for the free spray and the PM cases at two Tsoi conditions.…”

“…The reduction was explained by heat accumulation in the porous reactor. It was also shown that maximum combustion temperature reduces with increasing reactor heat capacity, pore density and specific surface area [14]. However, no heat release analysis result was done nor was combustion visualization results presented in this work.…”

“…The authors explained that the overall combustion temperature is kept low by the very effective heat transfer to the PM with its extremely high heat capacity (compared to surrounding gasses) and this allows the heat release to be achieved at approximately constant temperature [13]. Weclas suggests that PM technology could be a very promising approach in diesel HCCI systems for homogenization of the combustion process [14].…”

“…Their results showed that the secondary sprays in the multi-jet structure leaving the porous media have different tip velocities, which can cause charge stratification in addition to increasing the volume of the fuel air interaction. In an attempt to analyze the thermodynamic conditions of a PM engine in top dead center (TDC) position, a series of test were conducted by Weclas in a constant volume combustion chamber filled by porous SiC ceramic [14].…”