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首页> 外文期刊>International Journal of Heat and Mass Transfer >Convective heat transfer from a partially premixed impinging flame jet, Part I: Time-averaged results
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Convective heat transfer from a partially premixed impinging flame jet, Part I: Time-averaged results

机译：部分预混撞击火焰射流的对流传热，第一部分：时间平均结果

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Axial and radial profiles of time-averaged local heat fluxes of methane-air jet flames impinging normal to a cooled plate are reported, as functions of equivalence ratio, Reynolds number, and nozzle-plate spacing. Time-resolved behavior for these conditions is examined in the companion paper, Part II. Flame structure was studied visually and photographed. Both premixed and diffusion flame behavior was observed. Nozzle-stabilized flames revealed a stable, axisymmetric flame structure at nozzle-plate spacings less than 14 diameters. At greater nozzle-plate spacings, buoyancy-induced instabilities caused the flame to oscillate visibly. Lifted flames exhibited varied flame structures dependent upon the Reynolds number, equivalence ratio, and nozzle-plate spacing, stabilizing in the free jet, at the stagnation zone, or downstream in the wall jet. Local heat flux measurements made in the stagnation zone and along the plate adjacent to the wall jet flame revealed correlation of the local heat flux to the flame structure. Negative heat fluxes resulted from cool gases impinging on the hotter plate. The magnitude of positive heat fluxes depended on the proximity of the flame to the sensor surface, the rate of heat release, and the local molecular and turbulent transport.
机译：报道了垂直于冷却板撞击的甲烷-空气射流火焰的时间平均局部热通量的轴向和径向分布，它是当量比，雷诺数和喷嘴板间距的函数。这些条件的时间分辨行为在随附的第二部分中进行了检查。目视研究火焰结构并拍照。观察到预混和扩散火焰行为。喷嘴稳定的火焰在喷嘴板间距小于14的直径处显示出稳定的轴对称火焰结构。在较大的喷嘴板间距处，由浮力引起的不稳定性会导致火焰明显震荡。升起的火焰表现出取决于雷诺数，当量比和喷嘴板间距的变化的火焰结构，在自由射流，停滞区或壁射流的下游稳定。在停滞区并沿着与壁射流火焰相邻的板进行局部热通量测量，结果表明局部热通量与火焰结构相关。负热通量是由撞击在较热板上的冷气体引起的。正热通量的大小取决于火焰与传感器表面的接近程度，放热率以及局部分子和湍流传输。

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