モデル燃焼器を用いた噴霧燃焼の基礎研究

概要

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Using a model burner, spray flame was investigated for the fundamental case of laminar and axisymmetric conditions and at low load. The experimental data were compared with the calculated results by a numerical code(Fluent Ver.4.3). In the model burner, Kerosene/air spray was generated by an airblast atomizer and ignited by annular and central pilot flames. The range of flame stability, the distributions of temperature and species concentrations (CO_2, O_2, CO, NO_χ and total hydrocar-bons), and the velocity, mean diameter and number density of fuel droplets were measured. A phase Doppler velocimeter was used to measure the behavior of fuel droplets. Both temperature and the concentration of CO_2 are higher downstream of the flame and in the recirculating zone surrounding the flame. Fuel droplets are accelerated as the evaporation and combustion proceed, while their Sauter mean diameter is not changed significantly. Although the predicted temperature values are higher by 200〜300 K than the measurements, the trend of the temperature variation is reproduced well by the calculation. The concentration distributions of CO as well as of CO_2 are predicted fairly well despite the simplified two-step reaction scheme. The calculated droplet trajectories are also in fair agreement with the measured behavior of fuel droplets.
一般社団法人日本機械学会の論文
2000-12-25