Experimental study on the spray steadiness of an internal-mixing twin-fluid atomizer
Experimental study on the spray steadiness of an internal-mixing twin-fluid atomizer
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DOI：
10.1016/j.energy.2021.120394
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发表时间：
2021-07
期刊：
影响因子：
9
通讯作者：
Genbao Li;Chuqiao Li
中科院分区：
文献类型：
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作者：
Genbao Li;Chuqiao Li
利用高速摄像机和马尔文Spraytec衍射仪研究了内混式双流体（IMTF）雾化喷嘴近喷嘴区液体破碎强度和下游不同位置的液滴尺寸波动，分析了操作条件对喷雾稳定性的影响。结果表明，在本研究的工况条件下，IMTF雾化的一次破碎过程受各种破碎模式的影响，在给定位置处的特征液滴直径呈现不同程度的波动，可以认为是固有的非定常。中等气液质量比下的初始破碎过程比小气液质量比和大气液质量比下的破碎过程更不稳定。在不同的下游位置，较大的液滴的稳定性显着低于较小的液滴。与喷嘴附近区域相比，充分发展区域的喷雾稳定性得到了显著改善。此外，在近喷嘴区域中的各种液滴特征直径的时间分辨数据上执行的频谱分析示出了在频谱图中的脉动频率的存在。该脉动频率可用于评价GLR对喷雾稳定性的影响。
Liquid breakup intensity in the near-nozzle region and droplet size fluctuations at different downstream positions of an internal-mixing twin-fluid (IMTF) atomizer were studied by using a high-speed camera and a Malvern Spraytec diffractometer, and the effect of operating conditions on spray steadiness was analyzed. The results show that under the operating conditions of this study, the primary breakup process of IMTF atomization is affected by various breakup modes, and the characteristic droplet diameters at a given position exhibit different degrees of fluctuation, which can be considered to be inherently unsteady. The primary breakup process at medium gas/liquid mass flow ratio (GLR) is more unsteady than that at either small GLR or large GLR. At different downstream positions, the steadiness of larger droplets is significantly lower than that of smaller droplets. Compared with the near-nozzle region, the spray steadiness is significantly improved in the fully developed region. Moreover, frequency spectrum analysis performed on the time-resolved data of various droplet characteristic diameters in the near-nozzle region shows the presence of a pulsation frequency in the spectrum diagrams. This pulsation frequency can be used for evaluating the influence of GLR on the spray steadiness.