Response of different injector typologies to dwell time variations and a hydraulic analysis of closely-coupled and continuous rate shaping injection schedules

Ferrari, Alessandro; Mittica, Antonio

doi:10.1016/j.apenergy.2016.01.120

Cited by 35 publications

(44 citation statements)

References 31 publications

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“…The fuel injection process is one of the most critical elements in diesel engines to optimize the tradeoff between thermal efficiency and exhaust emissions [1][2][3][4]. First, the dynamic behavior of the injection system has a significant impact on aspects such as the injection and combustion duration [5][6][7] or the combustion noise [8,9]. Additionally, the flow conditions at the injector nozzle outlet affect the spray atomization and fuel-air mixing efficiency [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the effect of orifices inclination angle in multihole diesel injector nozzles. Part 1 – Hydraulic performance

Salvador

López

Morena

et al. 2018

Fuel

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Nozzle hydraulic performance has a significant impact on diesel spray development and combustion characteristics. Thus, it is important to understand the links between the nozzle geometry, the internal flow features and the spray formation. In this paper, a detailed analysis of the impact of the nozzle orifices inclination angle on its hydraulic performance is performed. For this purpose, three different nozzles with included angles of 90, 140 and 155 degrees are evaluated. Instantaneous injection rate and momentum flux are measured on a set of injector operating conditions (mainly injection pressure and discharge pressure). The results show that higher inclination angles lead to smaller mass 2 flow and momentum flux at steady-state conditions, due to the higher losses at the orifice inlet. These losses are translated in lower both area and velocity coefficients. Nevertheless, the impact of this parameter is limited thanks to the counteracting effect of the hydrogrinding process, which produces larger rounding radii at the orifice inlet as the included angle increases. Based on the experimental results, correlations of the discharge coefficient as a function of the Reynolds number are obtained and evaluated.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of the effect of orifices inclination angle in multihole diesel injector nozzles. Part 1 – Hydraulic performance

Salvador

López

Morena

et al. 2018

Fuel

View full text Add to dashboard Cite

show abstract

“…For instance, a greater air entrainment in the spray can lead to a reduction in soot emissions, but can also increase NO x as combustion temperatures increase [7]. In this regard, a major role is played by diesel injectors, which are one of the core components of CR systems [8,9]. Two main driving technologies exist to control the needle lift, and diesel injectors can thus be classified into solenoid- [10,11] or piezoelectric-driven [12,13].…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Emissions, Noise, and Fuel Consumption Comparison of Direct and Indirect Piezoelectric and Solenoid Injectors in a Low-Compression-Ratio Diesel Engine

et al. 2019

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An experimental investigation has been carried out to compare the performance and emissions of a low-compression-ratio Euro 5 diesel engine featuring high EGR rates, equipped with different injector technologies, i.e., solenoid, indirect-acting, and direct-acting piezoelectric. The comparisons, performed with reference to a state-of-the-art double fuel injection calibration, i.e., pilot-Main (pM), are presented in terms of engine-out exhaust emissions, combustion noise (CN), and fuel consumption, at low–medium engine speeds and loads. The differences in engine performance and emissions of the solenoidal, indirect-acting, and direct-acting piezoelectric injector setups have been found on the basis of experimental results to mainly depend on the specific features of their hydraulic circuits rather than on the considered injector driving system.

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“…On the one hand, the dimensions of the injector internal passages, including the control volume orifices, are critical for the injector needle dynamics and consequently the opening and closing slopes of the injection rate profile [18]- [20]. These effects are particularly important when using multiple injection strategies, since the injector acoustics also affect the needle motion [21], [22]. On the other hand, the geometry of the injector nozzle orifices also influence the nozzle outlet conditions and the spray propagation characteristics [23]- [25].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Different Techniques for Characterizing the Diesel Injector Internal Dimensions

et al. 2018

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The geometry of certain parts of diesel injectors is key to the injection, atomization and fuel-air mixing phenomena. Small variations on the geometrical parameters may have a strong influence on the aforementioned processes. Thus, OEMs need to assess their manufacturing tolerances, whereas researchers in the field (both experimentalists and modelers) rely on the accuracy of a certain metrology technique for their studies. In the current paper, an investigation of the capability of different experimental techniques to determine the geometry of a modern diesel fuel injector has been performed. For this purpose, three main elements of the injector have been evaluated: the control volume inlet and outlet orifices, together with the nozzle orifices. While the direct observation of the samples through an

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Response of different injector typologies to dwell time variations and a hydraulic analysis of closely-coupled and continuous rate shaping injection schedules

Cited by 35 publications

References 31 publications

Experimental investigation of the effect of orifices inclination angle in multihole diesel injector nozzles. Part 1 – Hydraulic performance

Experimental investigation of the effect of orifices inclination angle in multihole diesel injector nozzles. Part 1 – Hydraulic performance

Comparison of the Emissions, Noise, and Fuel Consumption Comparison of Direct and Indirect Piezoelectric and Solenoid Injectors in a Low-Compression-Ratio Diesel Engine

Comparison of Different Techniques for Characterizing the Diesel Injector Internal Dimensions

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