Experimental investigation of the orifice-to-orifice variability in jet velocities in a diesel injector
Experimental investigation of the orifice-to-orifice variability in jet velocities in a diesel injector
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柴油喷油器中喷流速度孔间变化的实验研究
DOI：
10.1016/j.fuel.2020.118353
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发表时间：
2020-11
期刊：
影响因子：
7.4
通讯作者：
Xiao Ma
中科院分区：
文献类型：
--
作者：
Carlo Coratella;Amrit Sahu;Lewis Parry;Hongming Xu;Xiao Ma
大量的科学文献已经证明，发动机效率会受到喷嘴到喷孔的射流速度变化的不利影响。这导致从喷射器孔排出的喷雾不均匀，从而导致偏离气缸内的预期空燃比。尽管有几项研究涉及喷流速度的孔与孔之间的变化，但这一现象背后的原因仍远未得到充分理解。本研究确定针摆动的可能因素负责喷嘴到孔的变化，在射流速度，这是喷雾不均匀性的基础。一个全面的实验活动已经进行了采用柴油在各种喷射方案。喷流速度的孔口到孔口的可变性已经通过高速成像技术进行了评估。从实验研究中可以看出，背压的增加，沿着更大的喷射压力，使喷雾不均匀性最小化。这可能是由于汽缸背压对针施加的增压作用，其经历更大的加速度，因此也减小了针摆动的幅度和持续时间。相反，喷射压力和背压的降低延长了针阀振荡的持续时间和振幅，恶化了喷雾发展的均匀性。本文介绍了试验情况，强调了背压对喷雾发展均匀性的关键作用。
A wide scientific literature has proved that engine efficiency is adversely affected by the orifice-to-orifice variability in jet velocities. This results in non-uniform spray exiting from the injector holes, leading to deviations from the expected Air/Fuel ratios within the cylinder. Despite several studies dealing with hole-to-hole variability in jet velocities, the reasons behind this phenomenon are still far from being fully understood. The present study identifies needle wobbles as the possible factor responsible for orifice-to-orifice variability in jet velocities, which underlies the spray non-uniformity. A comprehensive experimental campaign has been carried out employing Diesel fuel at various injection scenarios. Orifice-to-orifice variability in jet velocities has been assessed via a high-speed imaging technique. From the experimental investigation, it emerged that increase in backpressure, along with greater injection pressure, minimizes the spray non-uniformity. This may be attributed to the boosting action exerted by cylinder backpressure on the needle, which experiences a greater acceleration, thus reducing the amplitude of needle wobbles and duration as well. Conversely, reduction both in injection pressure and in backpressure prolong the duration and amplitude of needle oscillations, worsening the spray development uniformity. The paper describes the experimental activity and emphasizes the key-role of backpressure in spray development uniformity.
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影响因子：
2.6
作者：
A. Yule;I. Filipović
通讯作者：
A. Yule;I. Filipović
使用高速 X 射线相衬成像研究燃料和喷嘴几何形状对柴油喷油器中针阀离轴振荡的影响
影响因子：
1.3
作者：
Zhang, X.;Liu, J.;Wang, J.
通讯作者：
Wang, J.
DOI：
10.1177/0954407014542627
发表时间：
2015-03
期刊：
Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering
影响因子：
--
作者：
J. Desantes;F. J. Salvador;M. Carreres;J. Martínez-López
通讯作者：
J. Desantes;F. J. Salvador;M. Carreres;J. Martínez-López
DOI：
10.4271/2005-01-0913
发表时间：
2005-04
期刊：
--
影响因子：
--
作者：
J. Desantes;R. Payri;F. J. Salvador;V. Soare
通讯作者：
J. Desantes;R. Payri;F. J. Salvador;V. Soare
影响因子：
11.2
作者：
T. Bohl;G. Tian;A. Smallbone;A. Roskilly
通讯作者：
T. Bohl;G. Tian;A. Smallbone;A. Roskilly