An experimental study of the changes caused in the flame structure and pollutant emission characteristics by the modifications to the primary-air venturi of an inshot burner used in residential natural gas furnaces is presented. The venturi modification examined in this study are the shape of the venturi inlet and the venturi length. Modified venturis with curved inlets produce higher primary-air entrainment and slightly smaller (by 5 to 10%) emission indices of NO/sub x/ and CO than the standard parallel side venturi. However, the changes in the venturi length for the modified geometry do not result in significant further changes.
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机译：提出了对居住天然气熔炉中使用的闭塞燃烧器的初级空气文丘里的火焰结构和污染物排放特性引起的变化的实验研究。本研究中检测的文丘里修饰是文丘里入口和文丘里的形状。具有弯曲入口的改进的Venturis产生较高的初级空气夹带，略小（略小（5至10％）NO / Sub X /和Co的排放指数比标准的平行侧文丘里。然而，改进几何形状的文丘里的变化不会导致显着的进一步变化。
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