不同闪沸条件下液氨喷雾微观特性研究

IF 7.5 1区 工程技术 Q2 ENERGY & FUELS
Fuel Pub Date : 2025-06-06 DOI:10.1016/j.fuel.2025.135869
Xiao Liu, Gangwei Zeng, Xiaoxin Yao, Chenglong Tang, Zuohua Huang
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引用次数: 0

摘要

液氨作为一种零碳燃料,在内燃机领域受到了广泛的关注。氨喷雾和蒸发模型的发展迫切需要准确的粒径分布数据。本研究首先在高喷射压力(高达80 MPa)和环境压力(高达4 MPa)条件下,通过单孔喷油器(0.3 mm)实验研究了液氨喷雾的微观特性。在大范围内获得了包括Sauter平均直径(SMD)、特征液滴直径、液滴数密度等微观参数的统计结果。结果表明,环境压力或RP对氨喷雾的微观特性有显著影响。在火炬闪蒸区(压力比RP≤0.3),氨喷雾产生的液滴较多,液滴直径较小,统计SMD在15 μm左右。随着环境压力或RP的增加,液滴尺寸增大,数密度减小。在过渡闪(0.3 <;RP≤1)和非闪沸区(RP >;1), SMD统计结果分别约为20 μm和24 μm。增加喷射压力可以促进雾化,产生更多更小的液滴,液滴分布更均匀。在本研究选取的温度范围内,环境温度对液氨喷雾的微观特性影响较小,但随着环境温度的升高,蒸发作用更加明显。大范围的液滴尺寸分布和SMD为氨喷雾的建模和仿真提供了重要的数据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Microscopic characteristics study of liquid ammonia spray under different flash boiling conditions
Liquid ammonia, as a zero-carbon fuel, has received widespread attention in the field of internal combustion engines. The development of ammonia spray and evaporation models urgently requires accurate particle size distribution data. In this study, microscopic characteristics of liquid ammonia spray were firstly experimentally investigated under conditions of high injection pressure (up to 80 MPa) and ambient pressure (up to 4 MPa) with a single-hole injector (0.3 mm). Statistical results of microscopic parameters, including Sauter Mean Diameter (SMD), characteristic droplet diameter, and droplet number density were obtained over a wide range. The results indicate that ambient pressure or RP significantly affects the microscopic characteristics of ammonia spray. In flare flash boiling region (pressure ratio RP ≤ 0.3), ammonia spray produces more droplets with smaller diameter and the statistical SMD is around 15 μm. The droplet size increases and number density decreases with the increasement of ambient pressure or RP. In the transition flash (0.3 < RP ≤ 1) and non-flash boiling region (RP > 1), the SMD statistical results are approximately 20 and 24 μm, respectively. Increasing the injection pressure can promote atomization and generate more smaller droplets, with a more uniform distribution. Ambient temperature slightly affects the microscopic characteristics of liquid ammonia spray within the temperature range selected for this study, but evaporation becomes more pronounced as the ambient temperature increases. The wide range droplet size distribution and SMD are believed to provide important data for ammonia spray modeling and simulation.
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来源期刊
Fuel
Fuel 工程技术-工程:化工
CiteScore
12.80
自引率
20.30%
发文量
3506
审稿时长
64 days
期刊介绍: The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.
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