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首页> 外文期刊>International Journal of Heat and Mass Transfer >The influence of eccentric needle movement on internal flow and injection characteristics of a multi-hole diesel nozzle
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The influence of eccentric needle movement on internal flow and injection characteristics of a multi-hole diesel nozzle

机译：偏心针运动对多孔柴油喷嘴内流和喷射特性的影响

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摘要

The internal flow characteristics and injection characteristics of each nozzle hole in a multi-hole diesel nozzle are significantly affected by transient needle movement which studies have shown to be unconventional (eccentric). This eccentric needle movement (unconventional movement of needle within nozzle) is considered as one of the main causes responsible for injection start delay and also variations in fuel injection quantities and spray patterns from symmetric multi-hole nozzles. Needle eccentricity movement creating conditions (causes) and the effect of the eccentric behavior on flow in a symmetric multi-hole diesel nozzle, were computationally studied by examining the in-nozzle geometrical flow area of each nozzle hole during the transient movement of the needle. Based on experimentally determined needle displacement, moving mesh technique was employed in modeling the eccentric needle movement in the computational domain during the simulation. After which the effects of eccentricity within nozzle on in-nozzle hole flow characteristics (cavitation distribution, fuel flow velocity distribution) and injection characteristics (fuel injection rate) were investigated. With a direct effect on flow distribution within nozzle holes, eccentric needle movement has a direct effect on injection and can therefore be considered as one of the main causes of non-homogeneity during fuel injection process. At low needle lift, cavitation distribution, fuel flow velocity and fuel injection rate of each nozzle hole vary considerably and are highly dependent on the needle position. The progressive variations in fuel injection rate non-uniformity from the nozzle are caused to some extent, by the rate of change in in-nozzle geometrical flow area for each nozzle during injection process. The nozzle hole close to the needle displacement shows high level of sensitivity with regards to eccentric needle movement. This nozzle hole therefore exhibits the most variations of injection characteristics under all the cases of eccentricities. Also, with varying degree of needle eccentricity, rate of non-uniform coefficient of cycle fuel injection quantity within the nozzle varies disproportionately.
机译：多孔柴油喷嘴中每个喷嘴孔的内部流动特性和喷射特性受瞬态针头运动的显着影响，研究表明这是非常规的（偏心）。这种偏心的针头运动（针头在喷嘴内的非常规运动）被认为是造成喷射开始延迟的主要原因之一，并且也是燃料喷射量和对称多孔喷嘴的喷射方式变化的主要原因。通过检查针头瞬态运动期间每个喷嘴孔的喷嘴内几何流动面积，以计算的方式研究了针偏心运动的产生条件（原因）和偏心行为对对称多孔柴油喷嘴中流量的影响。基于实验确定的针头位移，在模拟过程中，采用了移动网格技术对计算域中的偏心针头运动进行了建模。之后，研究了喷嘴内的偏心度对喷嘴内孔流动特性（气蚀分布，燃料流速分布）和喷射特性（燃料喷射速率）的影响。偏心针的运动对喷嘴孔内的流量分布有直接影响，因此对喷射有直接影响，因此可以认为是燃料喷射过程中不均匀的主要原因之一。在低针升程下，每个喷嘴孔的气穴分布，燃油流速和燃油喷射率会发生很大变化，并且高度取决于喷针位置。来自喷嘴的燃料喷射速率不均匀性的逐渐变化在一定程度上是由喷射过程中每个喷嘴的喷嘴内几何流动面积的变化率引起的。靠近针头位移的喷嘴孔对于偏心针头运动显示出很高的灵敏度。因此，在所有偏心情况下，该喷嘴孔的喷射特性变化最大。而且，随着针偏心度的变化，喷嘴内循环燃料喷射量的不均匀系数的比率也成比例地变化。

著录项

  • 来源
  • 作者

    Chuqiao Wang; Adams Moro; Fuying Xue; Xiwen Wu; Fuqiang Luo;

  • 作者单位

    School of Automotive and Traffic Engineering, Jiangsu University. Zhenjiang 212013, China;

    School of Automotive and Traffic Engineering, Jiangsu University. Zhenjiang 212013, China,Mechanical Engineering Department, Accra Polytechnic, Accra, Ghana;

    School of Automotive and Traffic Engineering, Jiangsu University. Zhenjiang 212013, China;

    Zhen]iang Watercraft College of PLA, Zhenjiang 212013, China;

    School of Automotive and Traffic Engineering, Jiangsu University. Zhenjiang 212013, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Multi-hole nozzle; Needle eccentricity; Cavitation; Injection rate; CFD;

    机译：多孔喷嘴针偏心;空化注射速度差价合约;

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