| 摘要:结合定容燃烧弹和高速摄影技术建立喷雾可视化实验平台，模拟柴油机缸内高温高压的喷射环境，研究环境温度、环境压力和喷射压力对液氨宏观喷雾特性的影响。结果表明，液氨喷雾对环境温度敏感性极高，提高环境温度和环境压力均可不同程度地提高氨蒸发比例，使其在喷雾体积空间内分布更均匀，进而形成高质量混合气。在高环境温度下提高喷射压力虽可改善蒸发效果，但对于蒸发速率的改善并不明显。 |
| 关键词: 氨 高压喷射 喷雾 可视化 |
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| Experiments Study of Liquid Ammonia Spray Characteristics Under High Injection Pressure Conditions |
| CHEN Xi,ZHANG Zhenxian,DONG Pengbo,LONG Wuqiang |
| School of Energy and Power Engineering， Dalian University of Technology， Dalian 116024， China |
| Abstract:A spray visualization test platform was established by combining the constant volume combustion chamber and high-speed photography technology to simulate the high-temperature and high-pressure injection environment in a diesel engine cylinder，and the effects of ambient temperature，ambient pressure and injection pressure on the macroscopic spray characteristics of liquid ammonia were studied.The results show that liquid ammonia spray is very sensitive to ambient temperature，increasing the ambient temperature and pressure can both improve the ratio of ammonia evaporation to different degrees，with a more uniform distribution within the spray volume space，which in turn creates a higher-quality mixture.Although increasing the injection pressure at high ambient temperature can improve the evaporation，the increase of evaporation rate is not obvious. |
| Key words: ammonia high-pressure injection spray visualization |
