| 魏震鸿,周逸帆,张玉银.过冷/闪沸/超临界燃料喷雾特性的试验研究[J].内燃机工程,2023,44(1):90-99. |
| 过冷/闪沸/超临界燃料喷雾特性的试验研究 |
| Experimental Study on Characteristics of Subcooling/Flash Boiling/Supercritical Fuel Spray |
| DOI：10.13949/j.cnki.nrjgc.2023.01.012 |
| 关键词:超临界喷雾 喷雾特性 浓度分布 伪沸线 伪沸腾 |
| Key Words:supercritical spray spray characteristic concentration distribution widom line pseudo-boiling |
| 基金项目:国家自然科学基金面上项目（52176168） |
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| 摘要:利用高速Mie散射成像技术和紫外吸收/可见光散射技术对过冷/闪沸/超临界喷雾的宏观特性（气相和液相的贯穿距离、投影面积）及浓度场进行了试验测量，探讨了超临界喷雾的雾化过程及伪沸线对雾化所起的作用。结果表明：超临界喷雾的雾化过程可由伪沸线划分为类液相喷射和类气相喷射；超临界喷雾液相贯穿距离和投影面积远小于过冷喷雾和闪沸喷雾；气相贯穿距离发展速度远快于过冷喷雾和闪沸喷雾，同一喷油压力下，气相投影面积随时间呈对数函数关系，并且与喷油温度几乎无关；喷射压力在5 MPa~20 MPa范围内，采用超临界喷射策略比提高喷油压力更有利于加快蒸发和提高雾化效果；超临界喷雾浓度分布更均匀。 |
| Abstract:The high-speed Mie scattering imaging technology and ultraviolet-visible laser absorption/scattering technique were used to measure the macroscopic characteristics（the liquid or gas penetration and projection area） and the concentration field distribution of the supercooled/flash/supercritical spray， and the atomization process and the important role of the pseudo-boiling line of supercritical spray were discussed. The results show that the atomization process of supercritical spray can be divided into the liquid-like spray and gas-like spray according to the pseudo-boiling line. The liquid penetration and projection area of supercritical spray are much smaller than those of supercooled spray and flash spray. The development speed of gas penetration is much faster than that of supercooled spray and flash spray. Under the same injection pressure， the gas phase projection area shows a logarithmic function relationship with time， and is almost independent of injection temperature. During 5 MPa~20 MPa， using a supercritical injection strategy is more conducive to accelerating evaporation and improving atomization effect than increasing injection pressure. The supercritical spray concentration distribution is more uniform. |
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