Integrated Cavitating Injector Flow and Spray Propagation Simulation in DI Gasoline Engine

Chapman, David G.; Berg, Eberhard von; Tatschl, Reinhard; Corbinelli, Giovanni; D'Onofrio, Mario

doi:10.4271/2005-24-085

Cited by 2 publications

(1 citation statement)

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“…Cavitation in the gasoline fuel injection system is a topic of interest in recent years [112][113][114]. The injector temperature can have a significant impact on the cavitation formation [113].…”

Section: Gdi Injector Designmentioning

confidence: 99%

Fuel injector deposits in direct-injection spark-ignition engines

Wang

et al. 2015

Progress in Energy and Combustion Science

157

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Controlling fuel injector deposits is recognised as a challenge for advanced direct-injection sparkignition (DISI) engines. This paper gives a comprehensive overview of the research on formation, measurement, effect, and mitigation of injector deposits in DISI engines. Methodologies for the injector deposit studies include visual and compositional analysis. It is shown that injector deposits will reduce injector fuel flow rates, and lead to changes in spray characteristics. Consequently, spray angle and envelope are likely to be affected, and spray penetration distance as well as droplet diameter can be increased. Injector deposits are revealed to be primarily fuel-derived and created by two distinct free radical pathways, i.e., low temperature auto-oxidation and high temperature pyrolysis. Fuel compositions (olefins, aromatics, and sulphur), as well as T90 parameter, are significant factors in injector deposit formation. The worst consequences of injector fouling are pre-ignition, and engine misfiring and malfunction. Emissions, especially particulates, dramatically increase as the fuel injector becomes fouled. It appears that fuel detergent is the most effective method in controlling injector deposit formation if its chemistry and dosage rate are optimized. Outward opening piezo-driven injector configuration with a good surface finish, a sharp nozzle inlet, and a counter bore design, is useful in preventing injector deposit formation. Reducing injector nozzle temperature by methods such as designing special injector cooling passages, and improving engine design are also proven to be 2 helpful in reducing injector fouling. Anti-deposit coatings only delay the onset of injector deposit formation.

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Section: Gdi Injector Designmentioning

confidence: 99%

Fuel injector deposits in direct-injection spark-ignition engines

Wang

et al. 2015

Progress in Energy and Combustion Science

157

View full text Add to dashboard Cite

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Study on the influence of electronic injector nozzle geometry on the injection rate

Shao

Liu

Zhou

et al. 2009

2009 9th International Conference on Electronic Measurement &Amp; Instruments

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The experimental study was carried out to analyze the influence of nozzle geometries on the injection rate of common rail injector in test bench by using EFS instantaneous fuel mass instrument, and the internal flow field and cavitation in nozzle holes with different geometries were researched with CFD code FIRE using two-phase flow model. The nozzle geometric parameters including the hole number, the hole diameter, the length-to-hole diameter (L/D) ratio and the spray cone angle. The results showed that the nozzle geometry parameters have different effects on the peak value of the injection rate and the prophase injection rate under different injection pressures and injection pulse widths, especially the L/D ratio had great influence on the cycle to cycle fuel mass of larger cross area injectors under small pulse width.The CFD analysis showed that the cavitations originating at the entrance of the nozzle holes due to the local pressure drop which diminish the cross area result in the difference of injection rates and increase the hole to hole variations of fuel mass, and the cavitation had strong effect on the injection rate characteristics at the initial stage of needle lifting process for small L/D ratio. Index Terms -Diesel electronic injector. Injection rate test. Nozzle geometry. CFD two-phase flow model. Cavitation.

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Integrated Cavitating Injector Flow and Spray Propagation Simulation in DI Gasoline Engine

Cited by 2 publications

References 0 publications

Fuel injector deposits in direct-injection spark-ignition engines

Fuel injector deposits in direct-injection spark-ignition engines

Study on the influence of electronic injector nozzle geometry on the injection rate

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