Effects of diesel fuel temperature on fuel flow and spray characteristics
Effects of diesel fuel temperature on fuel flow and spray characteristics
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DOI：
10.1016/j.fuel.2015.09.008
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发表时间：
2015-12
期刊：
影响因子：
7.4
通讯作者：
Youngsoo Park;Joonsik Hwang;C. Bae;Ki‐Hyun Kim;Jin-wook Lee;Soon-Chan Pyo
中科院分区：
文献类型：
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作者：
Youngsoo Park;Joonsik Hwang;C. Bae;Ki‐Hyun Kim;Jin-wook Lee;Soon-Chan Pyo
冷启动问题一直是柴油发动机的一个问题。因此，在本研究中，柴油燃料的流动和宏观喷雾特性在一个很宽的燃料温度范围内进行了研究，为解决冷启动问题提供了有价值的见解。设计了一套由共轨系统和供油系统组成的燃油温度控制系统，实现了燃油温度在243 ~ 313 K范围内的控制。对于燃油流量特性，在相同的通电时间下，随着燃油温度从313 K降低到243 K，喷油量减少了50%。还证实了随着燃料温度降低，喷射正时的真实的开始延迟。其原因是燃油粘度的增加干扰了喷油器针阀的运动和喷嘴中的燃油流动。喷雾试验是在模拟冷起动条件下使用定容燃烧室（CVCC）。对于宏观喷雾特性，由于燃料蒸发过程的衰减和与周围气体的相互作用，冷燃料的液相燃料贯穿增加和喷雾角减小。这些结果可能导致冷起动时空气-燃料混合过程不良。
The cold start issue has been a problem in diesel engines. Thus, in the present research, the diesel fuel flow and macroscopic spray characteristics over a wide fuel temperature range were investigated to provide valuable insights for solving the cold start problem. An injection system including a common-rail and a fuel supplier was designed to control the fuel temperature from 243 K to 313 K. For the fuel flow characteristics, the results showed that the injection quantity decreased by 50% as the fuel temperature decreased from 313 K to 243 K under the same energizing time. It was also confirmed that the real start of injection timing was retarded as the fuel temperature decreased. The reason is that increased fuel viscosity disturbed the injector needle motion and fuel flow in the nozzle. The spray test was performed under the simulated cold start condition using a constant-volume combustion chamber (CVCC). For the macroscopic spray characteristics, the liquid-phase fuel penetration increased and the spray angle decreased with cold fuel due to attenuated fuel evaporation process and interaction with ambient gas. These results could cause poor air–fuel mixing process under the cold starting.