旋回流が流入する細い円管中での予混合火炎伝播挙動に関する数値解析(熱工学,内燃機関,動力など)

概要

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The propagation characteristics of premixed flame in a narrow tube with swirling flow have been examined by the numerical calculation in order to elucidate the cooling effects of the cold tube wall on the flame behaviors. In this calculation, the flame is fixed in the computational domain by adding an axial flow to the unburnt premixed gas so as to obtain the steady state propagation characteristics. The flame is classified into three configurations for angular velocity and tube radius as follows: For the smaller angular velocity, when the inlet velocity is small, the flame is able to stand only near the upstream boundary, and the flame reaches tube wall in the downstream. When the inlet velocity becomes larger, the flame blows off. For the larger angular velocity, the flame is able to stand at any positions in the tube, but the flame does not reach the tube wall so that the unburnt mixture flows out. For the intermediate angular velocity, the flame oscillates axially in the narrow tube.
2005-05-25