GAS-DYNAMIC RESISTANCE OF THE FILTER ELEMENT IN DIESEL PARTICULATE FILTER SYSTEM

The flow of exhaust gases containing dispersed particles (“diesel soot”) through porous ceramic structures of the folded type has been considered. It was shown that the total gas-dynamic resistance of the filtering element was determined by three components: the resistance of the input and output channels, the resistance of the porous wall, and the resistance of the dispersed particles layer formed on the wall. The simplified mechanisms of gas-dynamic losses, mathematical models and methods of their engineering calculation were proposed. Also the main criteria for the use of analytical expressions were chosen and a test cycle was carried out, which confirmed the validity of the proposed approaches for calculating the main parameters of the filtering unit: its volume, channel dimensions, surface, filter material structure and the properties of exhaust gases. It was established that the greatest resistance, which mainly determined the periodicity and the regime of filter regeneration, was created by a layer of dispersed particles. The second most important factor was the resistance of the porous wall, the through channels of which were determined by the porosity of the filter material. The most perfect from the point of view of gas dynamics, and, consequently, possessing minimum resistance were input and ouyput channels of filtering element. Such a ranking was purely conditional, as it characterized only the main factors affecting the amount of resistance to the exhaust gas flow, and could be useful while looking for ways and means to reduce the gas-dynamic resistance and choose both a neutralization system structure and the overall layout of the internal combustion engine exhaust gases. The experimental verification showed that the relative error in determining the gas-dynamic resistance did not exceed 20-25%, which made it possible to recommend the proposed model and calculation methods as a tool for designing one of the main elements of modern systems - the filter unit - for neutralizing diesel engines.

«дизельная сажа», diesel, exhaust gases, exhaust system, “diesel soot”, dispersed particles, soot filter, gas-dynamic resistance

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