Advanced hybrid electronic unit injector with accumulator for enhanced multiple injection and ultra high injection pressure capability

Tullis, Simon; Greeves, G.; Draper, David; Milovanović, Nebojša; Zuelch, Stefan

doi:10.4271/2007-01-1895

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…Applying higher injection pressure could help to achieve the advantage from the GHN even at inclined wall-impingement conditions. Recent development in ultra-high injection systems could provide injection pressure up to 300 MPa [30][31][32]. Higher injection pressure will lead to faster momentum interaction and increase the degree of momentum interaction.…”

Section: Summary and Discussionmentioning

confidence: 99%

Development and Evaporation of Group-Hole Nozzle Sprays under Various Surrounding and Impinging Conditions of Direct-Injection Diesel Engines

Moon

Zhang

Nishida

et al. 2011

International Journal of Engine Research

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In the present study, penetration and evaporation of the diesel sprays injected by a group of two closely spaced orifices (a group-hole nozzle) were investigated and compared with those of conventional single-hole nozzle sprays under various engine loads and wall-impinging conditions of direct-injection (DI) diesel engines. Both free and wall-impinging conditions were considered. The experiments were performed inside a constant-volume vessel under simulated ambient conditions for low and high engine loads of DI diesel engines. To investigate the effect of spray targeting, two impinging conditions (impingement angles of 45° and 90° with the same impingement distance) were applied. Geometry and liquid/vapour mass distributions of the evaporating diesel sprays were analysed using a laser absorption scattering (LAS) technique. Under a free spray condition, fuel evaporation of the group-hole nozzle spray was improved compared with that of the single-hole nozzle spray at low load conditions, while it showed simultaneous deterioration in fuel evaporation and spray tip penetration at high load conditions. Jet axes deflection of the two jets from the group-hole nozzle, which generated a dense liquid region at the central region of the spray, was responsible for this deteriorated evaporation at high load conditions. Under a vertical impingement condition (impingement angle of 90°), the group-hole nozzle spray showed simultaneous improvement in spray tip penetration and fuel evaporation at both low and high load conditions from strong momentum interaction of the two jets on the impingement wall. However, this improvement from the group-hole nozzle did not appear at an inclined wall-impingement condition (impingement angle of 45°) owing to weakened and delayed momentum interaction of the two jets. Both spray tip penetration and fuel evaporation of the group-hole nozzle spray were deteriorated at the inclined wall-impinging condition.

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Section: Summary and Discussionmentioning

confidence: 99%

Development and Evaporation of Group-Hole Nozzle Sprays under Various Surrounding and Impinging Conditions of Direct-Injection Diesel Engines

Moon

Zhang

Nishida

et al. 2011

International Journal of Engine Research

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Diesel Combustion

Andersson

2010

Handbook of Combustion

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The diesel combustion process and combustion system are briefly described, with the aim to provide a starting point for those interested in exploring and developing these. The chapter describes the typical characteristics of the diesel combustion process and its heat release. A description is given of how hardware in the combustion system supports the combustion process, for example, the importance of the combustion chamber geometry and the fuel injection system. Furthermore, useful theoretical concepts are presented to provide the reader with simple tools for understanding limiting processes for emissions formation. These include scaling relationships for air entrainment and flame lift‐off in quasi‐stationary diesel jets. Heavy duty and light duty combustion systems are then treated separately, since differences in duty cycle and customer requirements have given them different characteristics. Due to the high‐load duty cycle, with long injections and high fueling rates, heavy duty diesel combustion can be analyzed by analogy to a quasi‐stationary jet. In light duty engines, where injections typically are short, a significant portion of the heat release takes place after the end of injection. Therefore the picture of a quasi‐stationary jet becomes inadequate. Emphasis is put on describing fluid mechanic processes supporting the late‐cycle combustion in these engines. Finally, means of in‐cylinder emissions control in diesel engines are discussed.

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Experimental Analysis on the Characteristics of Two-Actuator Controlled Fuel Injection System

Wang

Liu

Chen

et al. 2010

2010 International Conference on Digital Manufacturing &Amp; Automation

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Advanced hybrid electronic unit injector with accumulator for enhanced multiple injection and ultra high injection pressure capability

Cited by 3 publications

References 5 publications

Development and Evaporation of Group-Hole Nozzle Sprays under Various Surrounding and Impinging Conditions of Direct-Injection Diesel Engines

Development and Evaporation of Group-Hole Nozzle Sprays under Various Surrounding and Impinging Conditions of Direct-Injection Diesel Engines

Diesel Combustion

Experimental Analysis on the Characteristics of Two-Actuator Controlled Fuel Injection System

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