3000 bar Common Rail System

Shinohara, Yukihiro; Takeuchi, Katsuhiko; Herrmann, Olaf Erik; Laumen, Hermann Josef

doi:10.1365/s38313-011-0002-8

Cited by 25 publications

(8 citation statements)

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“…Given the trends in the automotive industry, today it is necessary to have a resource of about 500 thousand km. It gives to designer the task of increasing the reliability of the most vulnerable elements of the diesel injectors: friction pairs, injector cone seat, nozzle holes and injector nozzle tip [1][2][3][4][5].…”

Section: Analysis Of Referencesmentioning

confidence: 99%

Modeling Of Hydrodynamic Processes in Diesel Injector Nozzle

Wróblewski¹

2019

mech

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Section: Analysis Of Referencesmentioning

confidence: 99%

Modeling Of Hydrodynamic Processes in Diesel Injector Nozzle

Wróblewski¹

2019

mech

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“…These requirements have resulted in the development of 6-, 9- and 12-hole high-efficiency diesel nozzles with small, conical holes and profiled nozzle inlets, 8,9 supported by accumulator pressures of up to 3000 bar. 10–12 The development and deployment of high-efficiency nozzles in commercial fuel injection equipment has resulted in increased injector deposits, 13–15 which has, in turn, resulted in inconsistent and/or reduced engine performance, increased engine-out emissions, and in extreme circumstances, injector failure (needle stick, blocked holes). 16 Previously, injector nozzles with cylindrical holes produced significant geometric cavitation, which supported the removal of early deposition.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of post-injection fuel flow in mini-sac diesel injectors part 1: Admission of external gases and implications for deposit formation

Makri

Lockett

Jeshani

2019

International Journal of Engine Research

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Samples of unadditised, middle distillate diesel fuel were injected through real-size optically accessible mini-sac diesel injectors into ambient air at common rail pressures of 250 and 350 bar, respectively. High-resolution images of white light scattered from the internal mini-sac and nozzle flow were captured on a high-speed monochrome video camera. Following the end of each injection, the momentum-driven evacuation of fuel liquid from the mini-sac and nozzle holes resulted in the formation of a vapour cloud and bubbles in the mini-sac, and vapour capsules in the nozzle holes. This permitted external gas to gain entrance to the nozzle holes. The diesel fuel in the mini-sac was observed to rotate with large initial vorticity, which decayed until the fuel became stationary. The diesel fuel remaining in the nozzle holes was observed to move inwards towards the mini-sac or outwards towards the nozzle exit in concert with the rotational flow in the mini-sac. The mini-sac bubbles’ internal pressure differences revealed that the bubbles must have contained previously dissolved oxygen and nitrogen. Under diesel engine operating conditions, this multi-phase mixture would be highly reactive and could initiate local pyrolysis and/or oxidation reactions. Finally, the dynamical behaviour of the diesel fuel in the nozzle holes would support the admission of external hot combustion gases into the nozzle holes, establishing the conditions for oxidation/pyrolysis reactions with surrounding liquid fuel films.

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“…2,3 This is achieved through the provision of high, stable fuel pressures of up to 2500 bar to 3000 bar in the pressure accumulator (common rail). 4–6 Most diesel injectors are of the multi-hole type, commonly supplied in a 6-hole, 8-hole, 9-hole or 12-hole configuration, with convergent passages and profiled hole inlets. This is to maintain high discharge efficiency by reducing the choking effect of geometric film cavitation on the nozzle flow, and to support improved atomization.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic luminescence in a model diesel injector return valve

Lockett

Bonifacio

2019

International Journal of Engine Research

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A sample of unadditized diesel fuel was passed through an optically accessible model diesel injector return valve, which consisted of two successive nozzles connected to an intermediate fuel gallery. The first nozzle was cylindrical, while the second nozzle was stepped. The fuel was observed to produce a multi-phase, cavitating flow and a luminous blue-violet emission at the entrance to the second nozzle hole. The flow in the upstream intermediate fuel gallery and the first nozzle hole remained single-phase. Spectral analysis of the luminous emission revealed a spectrum with thermal features containing broad spectral lines and peaks at 358, 389, 405, 412, 430 and 475 nm, suggesting that the emission was dominated by π*→π transitions in the alkylated mono-, di-, and tri-aromatics, with additional spectral contributions from CH, C2, C3 and hydrogen (H).

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3000 bar Common Rail System

Cited by 25 publications

References 0 publications

Modeling Of Hydrodynamic Processes in Diesel Injector Nozzle

Modeling Of Hydrodynamic Processes in Diesel Injector Nozzle

Dynamics of post-injection fuel flow in mini-sac diesel injectors part 1: Admission of external gases and implications for deposit formation

Hydrodynamic luminescence in a model diesel injector return valve

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