A New Technique for the Measurement of Sauter Mean Diameter of Droplets in Unsteady Dense Sprays
A New Technique for the Measurement of Sauter Mean Diameter of Droplets in Unsteady Dense Sprays
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DOI：
10.4271/890316
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发表时间：
1989-02
期刊：
影响因子：
--
通讯作者：
T. Kamimoto;H. Yokota;Haruki Kobayashi
中科院分区：
文献类型：
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作者：
T. Kamimoto;H. Yokota;Haruki Kobayashi
发展了一种测量非蒸发瞬态稠密喷雾液滴Sauter平均直径的新技术。该方法基于入射光消光原理，对喷雾阴影图像进行分析，并可对任意形状的瞬态喷雾进行Sauter平均直径的测量。此外，如果在计算和数据分析中包括关于质量和动量的守恒方程，则该方法允许在轴对称喷雾的准稳态区域中测量局部液滴尺寸。使用玻璃珠作为测试颗粒进行校准：这被证明具有平均在10%内的Sauter平均直径测量的准确度。新技术已在柴油和汽油喷雾中得到应用。实验结果表明，喷射压力的升高有助于减少整体Sauter平均直径，并且在外围区域中的液滴小于中心区域中的液滴。
A new technique is developed for the in-situ measurement of Sauter mean diameter of droplets in non-evaporating transient dense sprays. This method analyzes the image of a shadowpicture of a spray based on the incident light extinction principle, and allows the sizing of Sauter mean diameter of whole droplets in a transient spray with any shape. In addition, this method allows the measurement of the local droplet size in a quasi-steady region of an axisymmetric spray if the conservation equations regarding mass and momentum are included in the calculation and data analysis. A calibration was carried out using glass beads as test particles: this was proved to have an accuracy of Sauter mean diameter measurement within 10%, on average. Applications of the new technique to both diesel and gasoline (EFI) sprays have been made. The experimental results show that the rise in injection pressure contributes in the reduction of the overall Sauter mean diameter and that, in the peripheral region the droplets are smaller than those in the central region.