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Numerical Study on the Effects of Dual-Layer Liquid Sheets Merging on Primary Breakup in Dual-Orifice Nozzles
Atomization and Sprays ( IF 1.2 ) Pub Date : 2022-07-01 , DOI: 10.1615/atomizspr.2022041508
Lixin Shen, Hao Su, La Qin, Fei Xing, Shining Chan

Primary breakup during atomization is governed by complex mechanisms and is not well understood. Detailed numerical simulations using the volume-of-fluid method augmented with adaptive mesh refinement techniques were performed to study the formation and disintegration of liquid sheets produced from a dual-orifice pressure-swirl atomizer. The calculated atomization characteristics agree with the experimental results given a maximum relative error for the spray cone angle of 4.9% and maximum relative error for the Sauter mean diameter of 7.4%. For the five considered cases, changes in the pressure drop over a certain range do not affect the final spray angle size, but larger pressure drops will cause the liquid sheet to open faster while delaying the merger of the liquid sheets. The perturbation wave that causes the primary breakup of the dual-layer liquid sheets consists of two parts: the initial perturbation wave and the perturbation wave originating from the merger of the dual-layer liquid sheets, which dominates their primary breakup but whose generation is delayed by an increased pressure drop. The axial position when the disturbance wave first grows to its maximum amplitude matches well with the liquid sheet breakup length with a maximum error of 11.9%. Research on the merger of liquid sheets helps to further study the mechanisms of dual-layer liquid sheet primary breakup and guide the understanding of atomization in dual-orifice pressure-swirl atomizers.

中文翻译:

双层液层合并对双孔喷嘴一次破碎影响的数值研究

雾化过程中的初级分解受复杂机制控制,目前尚不清楚。使用流体体积法和自适应网格细化技术进行了详细的数值模拟,以研究双孔压力旋流雾化器产生的液层的形成和分解。计算的雾化特性与实验结果一致,喷雾锥角的最大相对误差为 4.9%,Sauter 平均直径的最大相对误差为 7.4%。对于所考虑的五种情况,压降在一定范围内的变化不会影响最终的喷射角度大小,但较大的压降会导致液层打开更快,同时延迟液层的合并。引起双层液片初次破裂的扰动波由两部分组成:初始扰动波和双层液片合并产生的扰动波,后者主导其一次破裂,但其产生延迟通过增加的压降。扰动波第一次增长到最大振幅时的轴向位置与液层破裂长度吻合较好,最大误差为11.9%。对液片合并的研究有助于进一步研究双层液片一次破碎的机理,指导对双孔压力旋流雾化器雾化的认识。其主导了它们的主要破裂,但其生成因压降增加而延迟。扰动波第一次增长到最大振幅时的轴向位置与液层破裂长度吻合较好,最大误差为11.9%。对液片合并的研究有助于进一步研究双层液片一次破碎的机理,指导对双孔压力旋流雾化器雾化的认识。其主导了它们的主要破裂,但其生成因压降增加而延迟。扰动波第一次增长到最大振幅时的轴向位置与液层破裂长度吻合较好,最大误差为11.9%。对液片合并的研究有助于进一步研究双层液片一次破碎的机理,指导对双孔压力旋流雾化器雾化的认识。
更新日期:2022-07-01
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