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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Measuring air core characteristics of a pressure-swirl atomizer via a transparent acrylic nozzle at various Reynolds numbers
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Measuring air core characteristics of a pressure-swirl atomizer via a transparent acrylic nozzle at various Reynolds numbers

机译：通过透明的丙烯酸喷嘴以各种雷诺数测量压力旋流雾化器的空芯特性

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摘要

Because of thermal fluid-property dependence, atomization stability (or flow regime) can change even at fixed operating conditions when subject to temperature change. Particularly at low temperatures, fuel's high viscosity can prevent a pressure-swirl (or simplex) atomizer from sustaining a centrifugal-driven air core within the fuel injector. During disruption of the air core inside an injector, spray characteristics outside the nozzle reflect a highly unstable, nonlinear mode where air core length, Sauter mean diameter (SMD), cone angle, and discharge coefficient variability. To better understand injector performance, these characteristics of the pressure-swirl atomizer were experimentally investigated and data were correlated to Reynolds numbers (Re). Using a transparent acrylic nozzle, the air core length, SMD, cone angle, and discharge coefficient are observed as a function of Re. The critical Reynolds numbers that distinguish the transition from unstable mode to transitional mode and eventually to a stable mode are reported. The working fluids are diesel and a kerosene-based fuel, referred to as bunker-A.
机译：由于对流体性质的依赖性，即使在固定的工作条件下温度变化，雾化稳定性（或流动状态）也会发生变化。特别是在低温下，燃料的高粘度会阻止压力旋流（或单缸）雾化器在燃料喷射器中维持离心驱动的空气核。在喷油器内部的空气芯破裂期间，喷嘴外部的喷雾特性反映出高度不稳定的非线性模式，其中空气芯长度，索特平均直径（SMD），锥角和排放系数具有可变性。为了更好地了解喷油器性能，对压力旋流式雾化器的这些特性进行了实验研究，并将数据与雷诺数（Re）相关。使用透明的丙烯酸喷嘴，观察到空芯长度，SMD，锥角和排放系数是Re的函数。报告了区分从不稳定模式到过渡模式以及最终到稳定模式的临界雷诺数。工作流体是柴油和煤油基燃料，称为燃料A。

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