The heat release process in a free volume combustion chamber and in porous reactors has been analyzed under Diesel engine-like\r\nconditions. The process has been investigated in a wide range of initial pressures and temperatures simulating engine conditions at\r\nthe moment when fuel injection starts. The resulting pressure history in both porous reactors and in free volumes significantly\r\ndepends on the initial pressure and temperature. At lower initial temperatures, the process in porous reactors is accelerated.\r\nCombustion in a porous reactor is characterized by heat accumulation in the solid phase of the porous structure and results in\r\nreduced pressure peaks and lowered combustion temperature.This depends on reactor heat capacity, pore density, specific surface\r\narea, pore structure, and heat transport properties. Characteristic modes of a heat release process in a two-dimensional field of\r\ninitial pressure and temperature have been selected. There are three characteristic regions represented by a single- and multistep\r\noxidation process (with two or three slopes in the reaction curve) and characteristic delay time distribution has been selected in five\r\ncharacteristic ranges. There is a clear qualitative similarity of characteristic modes of the heat release process in a free volume and\r\nin porous reactors. A quantitative influence of porous reactor features (heat capacity, pore density, pore structure, specific surface\r\narea, and fuel distribution in the reactor volume) has been clearly indicated.
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