Flow Field and Structure of Highly Turbulent Premixed Flames.

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  • 強乱流予混合火炎の流れ場と構造
  • キョウ ランリュウ ヨ コンゴウ カエン ノ ナガレバ ト コウゾウ

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Abstract

To examine the premixed flame structure in highly turbulent flow, by a cyclone-jet combustor, we have examined the flow field both in cold flow and in combustion field using LDV system. The turbulence scale has been obtained by Slot-Correlation method. The experiments have been conducted from the flamelet regime (Um=10 m/s) to the distributed reaction zone regime (Um=30 m/s) in combustion diagram. Results show that, in combustion filed, the mean axial velocity does not decrease as much and rms fluctuation velocity is lower along the center axis, compared with those in cold flow. It could be explained with the flow expansion in combustion. That is, the turbulence transport is reduced due to the existence of low-density gas in shear layer at the flame front, which leads to a longer potential core in combustion field than that in cold flow. Flame generated turbulence is observed in radial velocity distribution. The integral length scale becomes larger at the flame zone due to the flow expansion.

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