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首页> 外文会议>FISITA World Automotive Congress >AN ANALYTICAL STUDY OF INJECTOR TIP WETTING AND NEAR NOZZLE SPRAY STRUCTURE OF GASOLINE DIRECT INJECTION (GDI) FUEL INJECTORS
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AN ANALYTICAL STUDY OF INJECTOR TIP WETTING AND NEAR NOZZLE SPRAY STRUCTURE OF GASOLINE DIRECT INJECTION (GDI) FUEL INJECTORS

机译：汽油直喷（GDI）燃料喷射器喷射器尖端润湿及近喷嘴喷射结构的分析研究

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摘要

In order to meet the stringent Euro6 PN emission targets, it is important to understand the mechanism of the soot formation. Generally speaking, soot generates from combustion that occurs under overly rich air/fuel mixtures commonly due to poor air utilization or piston wetting. For gasoline direct injection (GDI) engines, in particular, fuel rich zones near injector tip due to fuel wetting has been identified as an additional source. The mechanism for fuel injector tip wetting is tightly coupled to the engine operating conditions, injector hole design, and needle motion dynamics. Over time, the fuel adhering to the injector can lead to degraded spray quality from deposit accumulation subsequently resulting in coking of the injector flow passages. In this study, an analysis based approach is presented to understand the injector tip wetting phenomenon along with near nozzle flow structure. The analysis is based on CFD of the internal nozzle flow using the Homogeneous Relaxation Model (HRM) approach for two injector designs considering the effect of stepped-hole and injector seat thickness.
机译：为了满足严格的EURO6 PN排放目标，重要的是要理解烟灰形成的机制。一般而言，烟灰从燃烧产生，由于空气利用率差或活塞润湿，通常发生在过度富含空气/燃料混合物的燃烧中。对于汽油直喷（GDI）发动机，特别是由于燃料润湿而导致的喷射器尖端附近的燃料富有区域被鉴定为另外的源。用于燃料喷射器尖端润湿机构紧密地联接到发动机操作条件，喷射器孔设计和针运动动力学。随着时间的推移，粘附到喷射器的燃料可以导致随后导致喷射器流动通道的沉积物积聚的喷涂质量降低。在该研究中，提出了一种基于分析的方法，以了解喷射器尖端润湿现象以及近喷嘴流动结构。考虑到阶梯式孔和喷射器座椅厚度的效果，该分析基于使用均匀的松弛模型（HRM）方法的内部喷嘴流动的CFD。

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