生物柴油和柴油直喷喷雾特性试验研究

高东志; 秦建芸; 许丹丹; 包俊江; 景晓军

doi:10.3969/j.issn.1001-2222.2021.04.006

车用发动机 ›› 2021, Vol. 0 ›› Issue (4) : 36. DOI: 10.3969/j.issn.1001-2222.2021.04.006

栏目

生物柴油和柴油直喷喷雾特性试验研究

高东志，秦建芸，许丹丹，包俊江，景晓军

作者信息 +

Spray Characteristic of Direct Injection for Biodiesel and Diesel

GAO Dongzhi，QIN Jianyun，XU Dandan，BAO Junjiang，JING Xiaojun

Author information +

文章历史 +

摘要

应用单孔喷油器结合高速摄影技术研究了B5生物柴油和京标-10号柴油在不同喷油压力、环境温度和燃油温度条件下的喷雾特性，喷雾参数包括喷雾形态、喷雾贯穿距、喷雾贯穿速度和喷雾锥角。结果表明：两种燃油的喷雾贯穿距随时间几乎呈线性变化，喷射初期喷雾贯穿速度较大，且随着喷油压力的增加喷雾贯穿速度增加；随着时间的推移（油束的发展），喷雾贯穿速度逐渐下降，且较高的喷油压力下，喷雾贯穿速度下降趋势更加明显；在喷油压力和燃油温度相同时，随着环境温度从25 ℃升高到350 ℃，喷雾过程中的最大喷雾贯穿速度更大，且120 MPa喷油压力下，最大喷雾贯穿速度可达400 m/s。在相同条件下，B5生物柴油油束蒸发持续时间较京标-10号柴油更长，表明生物柴油的加入使得B5生物柴油的沸点升高，相同温度下蒸发能力变差。比较相同条件下B5生物柴油和京标-10号柴油喷雾锥角，京标-10号柴油的喷雾锥角略大，这是由于京标-10号柴油黏度较小，液滴间作用力小，使得喷雾锥角增大。

Abstract

The spray characteristics of B5 biodiesel and Beijing standard -10 diesel were studied under different injection pressures, ambient temperatures and fuel temperatures based on single-hole injector combined with high-speed photography technology, which included spray form, spray penetration distance, spray penetration speed and spray cone angle. The results show that the spray penetration distances of both fuels are almost linear with time. The spray penetration speed is large at the beginning and increases with the increase of injection pressure. With the development of the spray, the spray penetration speed gradually decreases and has an obvious decrease under the higher injection pressure. Under the condition of the same injection pressure and fuel temperature, the maximum spray penetration speed will be larger when ambient temperature increases from 25 ℃ to 350 ℃ and reaches 400 m/s at the injection pressure of 120 MPa. Compared with Beijing standard -10 diesel, the evaporation duration of B5 biodiesel is longer, which shows that the boiling point of B5 biodiesel increases after adding biodiesel and the evaporation hence becomes slow at the same temperature. In addition, the spray cone angle of Beijing standard -10 diesel is slightly larger because its low viscosity reduces the force between the droplets.

导出引用

高东志，秦建芸，许丹丹，包俊江，景晓军. 生物柴油和柴油直喷喷雾特性试验研究[J]. 车用发动机. 2021, 0(4): 36 https://doi.org/10.3969/j.issn.1001-2222.2021.04.006

GAO Dongzhi，QIN Jianyun，XU Dandan，BAO Junjiang，JING Xiaojun. Spray Characteristic of Direct Injection for Biodiesel and Diesel[J]. Vehicle Engine. 2021, 0(4): 36 https://doi.org/10.3969/j.issn.1001-2222.2021.04.006