Flow Characteristics of Rectangular Liquid Jets Injected Into Low Subsonic Crossflow

Volume 5: Multiphase Flow Pub Date : 2019-11-20 DOI:10.1115/ajkfluids2019-4861

M. Tadjfar, A. Jaberi, R. Shokri

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引用次数: 1

Abstract

Perpendicular injection of liquid jets into gaseous crossflow is well-known as an effective way to obtain good mixing between liquid fuel and air crossflow. Mostly, injectors with circular holes were used as the standard method of fuel spraying. However, recently a great attention to injectors with non-circular holes has emerged that aims to improve the quality of fuel mixing and consequently combustion efficiency. In the present work, rectangular injectors with different aspect ratios varying from 1 to 4 were experimentally studied. Using a wind tunnel with maximum air velocity of 42 m/s, tests were performed for a wide range of flow conditions including liquid-to-air momentum ratios of 10, 20, 30 and 40. Backlight shadowgraphy and high speed photography were employed to capture the instantaneous physics of the liquid jets discharged into gaseous crossflow. The flow physics of the rectangular liquid jets were investigated by means of flow visualizations. Different regimes of flow breakup including capillary, arcade, bag and multimode were observed for rectangular jets. Moreover, a new technique was used to calculate the trajectory of the liquid jets. It was shown the nozzle’s shape has no significant effect on jet trajectory. Also, the momentum ratio was found to has a profound effect on jet trajectory.

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低亚音速交叉流中矩形液体射流的流动特性

在气体横流中垂直喷射液体射流是实现液体燃料与空气横流良好混合的有效途径。大多数情况下，圆孔喷油器是燃油喷射的标准方法。然而，近年来，为了提高燃油混合质量和燃烧效率，非圆孔喷油器引起了人们的极大关注。本文对长宽比为1 ~ 4的矩形喷射器进行了实验研究。在最大风速为42米/秒的风洞中，进行了广泛的流动条件测试，包括液气动量比为10、20、30和40。采用背光阴影摄影和高速摄影技术捕捉气体横流中液体射流的瞬时物理特性。采用流动可视化方法研究了矩形液体射流的流动物理特性。对矩形射流进行了毛细型、拱廊型、袋型和多模型等不同类型的破碎。此外，还采用了一种新的方法来计算液体射流的运动轨迹。结果表明，喷嘴形状对射流轨迹的影响不显著。此外，还发现动量比对射流轨迹有深远的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Volume 5: Multiphase Flow

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