A New Optical Sensor for the Measurement of the Displacement of the Needle in a Common Rail Injector

Amirante, Riccardo; Catalano, L. A.; Coratella, Carlo

doi:10.4271/2013-24-0146

Cited by 10 publications

(2 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Once the injection commences, the upward needle motion gives rise to a rarefaction wave traveling from the injector nozzle towards the rail [1,2]. As the pressure wave reaches the common rail, pressure fluctuations occur.…”

Section: Pressure Fluctuations In the Modern Injection Systemmentioning

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

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.

show abstract

Section: Pressure Fluctuations In the Modern Injection Systemmentioning

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

show abstract

“…This is because, on the one hand, the transient dynamics must be considered when considering the needle motion effect. On the other hand, only limited techniques can measure the needle motion of the injector nozzle, mainly referring to the usage of optical nozzles [9,10] or optical sensors [11]. However, those methods are most suitable for low-pressure scenarios, which are different from the operating conditions of diesel nozzles.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Needle Motion Profile Effect on Diesel Spray in Near-Nozzle Field

et al. 2022

View full text Add to dashboard Cite

A variety of needle-motion profiles are used in diesel injectors. However, it is unclear what the underlying mechanism is to determine the needle-motion profiles and how they affect the spray dynamics. It has been of significant interest to examine how the spray dynamics will change if only altering the needle valve opening speed or closing speed while all other parameters are kept the same. The different needle-motion profiles were obtained using a piezo nozzle (Nozzle #P) and a solenoid nozzle (Nozzle #S), which have identical nozzle geometry. By utilizing the X-ray imaging technique, it was observed that the average needle valve speed of Nozzle #P was 51% higher at the opening stage but 17% lower at the closing stage than Nozzle #S. When the needle valve lift is low (approximately 200 μm), the needle valve opening speed has a crucial effect on spray dynamics. The faster needle valve opening of Nozzle #P results in a 42% larger spray spreading angle and 34% lower spray velocity at the downstream field. The spray dynamics may be controllable by properly designing the needle-motion profiles in the scenarios of the low needle lifts. However, when the needle valve is sufficiently open (approximately over 200 μm), almost identical spray characteristics were observed regardless of the needle-motion profiles.

show abstract

Additional Sensors for Combustion Analysis

Maurya

2019

Mechanical Engineering Series

View full text Add to dashboard Cite

A New Optical Sensor for the Measurement of the Displacement of the Needle in a Common Rail Injector

Cited by 10 publications

References 9 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

Investigation of Needle Motion Profile Effect on Diesel Spray in Near-Nozzle Field

Additional Sensors for Combustion Analysis

Contact Info

Product

Resources

About