The article is devoted to the basic regularities identification of fuel and oxidizer flow in micro-flame burner devices with U-shaped echeloned grates of flat flame stabilizers. The relevance of mentioned burner type application is discussed. The use of latter is associated, in the first place, with ability to generate the desired temperature field in the combustion zone to reduce the thermal load on the boiler embrasure walls is noted. The results of mathematical modeling for considered

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... l situation are introduced. Comparative analysis structure data of flow for U-shaped and stair shape echeloned grates of the stabilizers as well as for the conditions when the ends of the stabilizers are arranged in the same plane are represented. The features of manifestation of the air consumption redistribution effect in channels of echeloned grates compared with the lack of echeloning condition are analyzed. It is noted that according to the data obtained in the case of separation of the flame stabilizer airflows increases in channels adjacent to the first upstream stabilizer, and reduced in the other channels. The results of the research of reverse flow zones characteristics at stabilizer back-stern-part areas are adduced. The governing regularities findings for velocity pulsations behavior in the considered burner are discussed. The greatest value of the meansquare velocity pulsations, in all the situations that are examined, observed over the stabilizer stalling edge is indicated. However, in the case of not echeloned grate the pulsations field patterns are conformable over all the stabilizers, but in the case of its echeloned arrangement-essentially different for different stabilizers are found. Under the conditions as U-shaped and stair shaped echeloned grates, over the first upstream