不同环境背压和环境温度下的液氨喷雾微观特性

doi:10.3969/j.issn.1674-8484.2024.04.008

摘要/Abstract

摘要：

为以液氨为内燃机燃料来实现低碳化和零碳化，实验研究了液氨喷雾的微观雾化特性。采用激光粒径微观成像（PDIA）方法，使用单孔喷油器，在低喷射压力（1 MPa）、环境背压100、200、400、600 kPa、环境温度293、313、333 K下，进行喷雾实验。获得了液滴概率密度分布函数（PDF）、累计体积分布函数（CDF）、Sault平均直径（SMD）和液滴数量密度等微观参数。结果表明：液氨喷雾在低环境背压下雾化效果好，喷雾中小液滴数量多，SMD较小，增大环境背压，喷雾概率密度分布和累计体积分布曲线向大粒径方向移动，大液滴数量增加，液滴数量密度减小；液氨液滴概率密度分布、累计体积分布和SMD几乎不会随环境温度的变化而变化，但增加环境温度可以增强液氨喷雾的蒸发，环境温度高的时候液氨喷雾蒸发增强。

关键词: 内燃机, 低碳化零碳化, 液氨喷雾, 微观特性, 液滴尺寸分布, 液滴数量密度

Abstract:

Microscopic characteristics were studied for liquid ammonia spray experimentally to realize low-carbon and zero-carbon goals with liquid ammonia as fuel of internal combustion engine. The liquid ammonia spray at different ambient pressures (100, 200, 400, 600 kPa) and ambient temperatures (293, 313, 333 K) were experimentally investigated by using the Particle/Droplet Image Analysis (PDIA) method and using a single hole injector with the injection pressure of 1 MPa. Some microscopic parameters were obtained, such as the particle density function, cumulative distribution function, the Sault Mean Diameter (SMD), and the droplet number density. The results show that the liquid ammonia spray has a good atomization effect and have large amount of small particles under low ambient pressure; The particle density function and cumulative distribution function move to a larger droplet sizes, the number of larger droplets increase and the droplet density decrease; The particle density function, cumulative distribution function and SMD hardly changed with the ambient temperature, but the liquid ammonia spray evaporation is enhanced at high ambient temperature.

Key words: internal combustion engines, zero-carbon and low-carbon emissions, liquid ammonia spray, microscopic characteristics, droplet size distribution, droplet number density

中图分类号:

TK46+4

刘潇, 姚晓新, 王泽, 汤成龙. 不同环境背压和环境温度下的液氨喷雾微观特性[J]. 汽车安全与节能学报, 2024, 15(4): 520-525.

LIU Xiao, YAO Xiaoxin, WANG Ze, TANG Chenglong. Microscopic characteristics of liquid ammonia spray at different ambient pressures and ambient temperatures[J]. Journal of Automotive Safety and Energy, 2024, 15(4): 520-525.

图/表 9

图1 喷雾微观特性实验示意图

图2 拍摄窗口示意图

图3 粒子数量无关性验证

图4 不同环境背压下液氨喷雾数量比例概率密度分布

图5 不同环境背压下液氨喷雾累积体积分布（环境温度293 K）

图6 不同位置液氨喷雾粒径

图7 不同环境背压下液氨喷雾平均液滴数量

图8 不同环境温度下液氨喷雾概率密度分布

图9 不同环境温度下液氨喷雾累积体积分布

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