Optical Sensor for the Needle Lift Detection in the Common Rail Injector

Coratella, Carlo; Parry, Lewis; Sahu, Amrit Bikram; Xu, Hongming

doi:10.4271/2019-24-0193

Cited by 4 publications

(1 citation statement)

References 38 publications

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“…In fact, from a research activity (UK Patent Application No. 1819731.9) [20], it emerges that if on one hand increasing backpressure exerts a stronger barrier to the fuel flow, on the other hand, it is believed to boost the needle lift. This physical interpretation is based on the assumption that, at commencing injection event, the pressurized fuel momentum can be divided into two factors: with M PF , M NP , and M O being the pressurized fuel momentum, the fuel momentum transferred onto the needle protrusion, and the fuel momentum towards the orifice inlet, respectively (Fig.…”

Section: The Influence Of the Backpressure On The Rail Pressure Fluctuationsmentioning

confidence: 99%

Experimental Investigation of the Rail Pressure Fluctuations Correlated with Fuel Properties and Injection Settings

Coratella

Parry

et al. 2021

Automot. Innov.

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Injection-induced rail pressure fluctuations are proven to cause nonuniform spray development. These fluctuations are also responsible for generating lower injection pressures, to the detriment of jet penetration length and break-up timing. Despite the vast literature dealing with such issues, several aspects of rail pressure fluctuations remain unclear. Additionally, the need for compliance with the emission legislation has shed light on the potential of alternative fuels, which represent a pathway for sustainable mobility. This scenario has motivated the present study dealing with the assessment of the time history of rail pressure correlated with fuel properties. Tests have been performed using a last-generation common rail injection equipment under various injection settings, employing diesel and 2-methylfuran-diesel blend. This paper describes the research activity and aims to provide new insights into the correlation of rail pressure fluctuations with fuel properties.

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Section: The Influence Of the Backpressure On The Rail Pressure Fluctuationsmentioning

confidence: 99%

Experimental Investigation of the Rail Pressure Fluctuations Correlated with Fuel Properties and Injection Settings

Coratella

Parry

et al. 2021

Automot. Innov.

Self Cite

View full text Add to dashboard Cite

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Experimental investigation of the orifice-to-orifice variability in jet velocities in a diesel injector

Coratella

Sahu

Parry

et al. 2020

Fuel

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Internal Nozzle Flow Simulations of the ECN Spray C Injector under Realistic Operating Conditions

Guo¹,

Torelli²,

Bautista³

et al. 2020

SAE Int. J. Adv. & Curr. Prac. in Mobility

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<div class="section abstract"><div class="htmlview paragraph">In this study, three-dimensional large eddy simulations were performed to study the internal nozzle flow of the ECN Spray C diesel injector. Realistic nozzle geometry, full needle motion, and internal flow imaging data obtained from X-ray measurements were employed to initialize and validate the CFD model. The influence of injection pressure and fuel properties were investigated, and the effect of mesh size was discussed. The results agreed well with the experimental data of mass flow rate and correctly captured the flow structures inside the orifice. Simulations showed that the pressure drop near the sharp orifice inlet triggered flow separation, resulting in the ingestion of ambient gas into the orifice via a phenomenon known as hydraulic flip. At higher injection pressure, the pressure drop was more significant as the liquid momentum increased and the stream inertia was less prone to change its direction. Two fuels were tested in both experiments and simulations, namely iso-octane and n-dodecane. With the former, the gas species in the low-pressure region consisted of both fuel vapor and non-condensable gas. With n-dodecane, due to its low saturation pressure, fuel vapor was practically absent. Furthermore, it was found that fuel cavitation might not be the only phenomenon able to trigger flow separation, as “pseudo-cavitation” caused by non-condensable gas expansion played a similar role in promoting the conditions that led the flow to detach from the wall. Finally, it was found that a minimum mesh size of 10 μm within the orifice was sufficient to ensure the main flow features were captured. However, it was shown that finer meshes allowed for better resolution of the near-wall gas layer, resulting in more flow features to be resolved.</div></div>

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Optical Sensor for the Needle Lift Detection in the Common Rail Injector

Cited by 4 publications

References 38 publications

Experimental Investigation of the Rail Pressure Fluctuations Correlated with Fuel Properties and Injection Settings

Experimental Investigation of the Rail Pressure Fluctuations Correlated with Fuel Properties and Injection Settings

Experimental investigation of the orifice-to-orifice variability in jet velocities in a diesel injector

Internal Nozzle Flow Simulations of the ECN Spray C Injector under Realistic Operating Conditions

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