基于定容弹的缸内喷水喷雾特性试验研究
Experimental Research of Direct Water Injection Characteristics Based on Constant Volume Vessel
内燃机缸内喷水技术因其在抑制爆震、减少排放及降低油耗方面的潜力而具广泛前景。本研究基于定容弹，研究了五孔非对称布置喷射器水射流在不同条件下的喷雾特性。喷水温度范围为 30°C 至 240°C，背景压力为 0.2bar 至 10bar。结果表明，近场喷雾宽度随水温升高而增大。但在背压为 0.8bar 至 2.5bar 时，较高的过热度会导致严重的喷雾坍塌。研究发现，闪沸下的坍塌是由于喷雾中心存在低压区，而较高的过热度会使低压区迁移至喷嘴出口附近，从而导致喷雾坍塌增强。此外，除了过热度和背景压力之外，水射流喷雾坍塌与喷水压力之间也存在密切联系。
Direct water injection (DWI) within internal combustion engine has become a promising technology due to its potential for suppressing knock, reducing emissions and lowering fuel consumption. In this research, the spray characteristics of water jet discharged from a five-hole asymmetrical injector under different conditions were investigated based on a constant volume vessel. The water injection temperature ranged from 30°C to 240°C, and the ambient pressure varied from 0.2bar to 10bar. The results showed that the spray width at near-field increases with water temperature. However, at ambient pressures of 0.8bar to 2.5bar, higher superheat level resulted in severe spray collapse. It was identified that the collapse under flash boiling occurs as a result of the presence of the low-pressure zone at the center of the spray, and higher superheat level migrate the low-pressure zone closer to the nozzle exit, resulting in enhanced spray collapse. This work also suggests a strong correlation between spray collapse and water injection pressure, in addition to superheat level and ambient pressure.
白杨;王慧江;吕阳;康哲;李雁飞;
机械与运载工程学院,重庆大学,重庆,400044;机械与运载工程学院,重庆大学,重庆,400044;机械与运载工程学院,重庆大学,重庆,400044;机械与运载工程学院,重庆大学,重庆,400044##机械传动国家重点实验室，重庆大学，重庆，400044;汽车安全与节能国家重点实验室,清华大学,北京,100084;
Direct water injection flash boiling spray width spray collapse spray morphology
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