Investigation of Spray Angle Measurement Techniques
Investigation of Spray Angle Measurement Techniques
复制标题
DOI：
10.1109/access.2019.2899214
复制
发表时间：
2019-01-01
期刊：
影响因子：
3.9
通讯作者：
Ganippa, Lionel Christopher
中科院分区：
文献类型：
--
作者：
Ruiz-Rodriguez, Irene;Pos, Radboud;Ganippa, Lionel Christopher
燃油喷射和空气夹带的缸内流体动力学过程会影响不断变化的燃油喷雾的结构和形状，从而改变柴油发动机的点火、燃烧和污染物形成过程。文献中使用了不同的喷雾角度检测方法来研究全局和局部喷雾特性。本文确定了五种最广泛使用的柴油喷雾角度检测方法，并用于评估每种检测方法的特征：基于喷雾穿透长度的检测范围的方法、在近场和远场喷雾区域具有固定检测范围的方法、基于三角形的方法和基于平均局部数据点的方法。喷雾是从我们的喷雾室获取的，并使用不同的阈值技术进行处理，以探索喷雾角度检测方法之间的差异。所有五种方法都针对整个喷射期间随时间变化的喷雾产生了类似的喷雾角度变化的全局趋势。然而，每种方法检测到的实际喷雾角度值并不总是具有可比性。在喷射开始初期，不同检测方法之间的喷雾角度值差异较大，并且随着喷雾接近稳定状态，这些差异系统地减小。与检测近场角度的方法相比，检测远场角度的方法表现出较低的时空变化。对角度检测方法之间的可比性进行了评估，结果为喷雾角度检测方法的选择提供指导。
The in-cylinder fluid-dynamic processes of fuel injection and air entrainment influence the structure and shape of evolving fuel sprays, which can subsequently alter the ignition, combustion, and pollutant formation processes in diesel engines. Different spray angle detection methods have been used in the literature to investigate the global and local spray characteristics. In this paper, the five most widely used diesel spray angle detection methods were identified and used to evaluate the characteristic features of each detection method: methods with a detection range based on the spray penetration length, methods with a fixed detection range in the near- and far-field spray regions, triangular-based methods, and methods based on averaging local data points. The sprays were acquired from our spray chamber and processed with different thresholding techniques to explore the differences between the spray angle detection methods. All five methods generated a similar global trend of spray angle variation for temporally evolving sprays over the complete injection period. However, the actual spray angle values detected by each method were not always comparable. The differences in spray angle values between the different detection methods were larger during the early start of injection, and these differences systematically decreased as the spray approached a steady state. The methods that detected the angle in the far field demonstrated lower spatio-temporal variability when compared with the methods that detected the angle in the near field. An assessment of the comparability between angle detection methods was made, and the outcome provides guidance for the selection of the spray angle detection method.