Investigation of internal nozzle flow, spray and combustion characteristics fueled with diesel, gasoline and wide distillation fuel (WDF) based on a piezoelectric injector and a direct injection compression ignition engine

Yu, Wenbin; Yang, Wenming; Zhao, Feiyang

doi:10.1016/j.applthermaleng.2016.12.034

Cited by 43 publications

(33 citation statements)

References 35 publications

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“…Several studies have also discussed the influence of fuel properties on the cavitation formation inside the injection nozzle and on the conditions at the injection hole outlet. Yu et al [28] numerically studied the influence of gasoline, diesel, wide distillation fuels, and kerosene on internal nozzle flow, spray formation, combustion, and emissions characteristic. The numerical studies of internal nozzle flow were made for one nozzle injection hole using the RANS approach at a constant needle position and different injection pressures.…”

Section: Introductionmentioning

confidence: 99%

Effect of the In-Cylinder Back Pressure on the Injection Process and Fuel Flow Characteristics in a Common-Rail Diesel Injector Using GTL Fuel

et al. 2021

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The presented paper aims to study the influence of mineral diesel fuel and synthetic Gas-To-Liquid fuel (GTL) on the injection process, fuel flow conditions, and cavitation formation in a modern common-rail injector. First, the influence on injection characteristics was studied experimentally using an injection system test bench, and numerically using the one-dimensional computational program. Afterward, the influence of fuel properties on internal fuel flow was studied numerically using a computational program. The flow inside the injector was considered as multiphase flow and was calculated through unsteady Computational Fluid Dynamics simulations using a Eulerian–Eulerian two-fluid approach. Finally, the influence of in-cylinder back pressure on the internal nozzle flow was studied at three distinctive back pressures. The obtained numerical results for injection characteristics show good agreement with the experimental ones. The results of 3D simulations indicate that differences in fuel properties influence internal fuel flow and cavitation inception. The location of cavitation formation is the same for both fuels. The cavitation formation is triggered regardless of fuel properties. The size of the cavitation area is influenced by fuel properties and also from in-cylinder back pressure. Higher values of back pressure induce smaller areas of cavitation and vice versa. Comparing the conditions at injection hole exit, diesel fuel proved slightly higher average mass flow rate and velocities, which can be attributed to differences in fluid densities and viscosities. Overall, the obtained results indicate that when considering the injection process and internal nozzle flow, GTL fuel can be used in common-rail injection systems with solenoid injectors.

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Section: Introductionmentioning

confidence: 99%

Effect of the In-Cylinder Back Pressure on the Injection Process and Fuel Flow Characteristics in a Common-Rail Diesel Injector Using GTL Fuel

et al. 2021

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“…For this reason, significant research effort has been made into analyzing the influence of the injector nozzle geometry into the injector hydraulics, 1–3 spray formation 4–7 and combustion. 8–10 In this sense, one of the aspects that can be explored is the shape itself of the nozzle orifices. On an experimental activity, Hong et al 11 showed that elliptical orifices could help to improve spray atomization, thanks to a more significant cavitation formation inside the nozzle in one of the sides of the ellipse.…”

Section: Introductionmentioning

confidence: 99%

Impact of counter-bore nozzle on the combustion process and exhaust emissions for light-duty diesel engine application

Payri

Morena

Monsalve‐Serrano

et al. 2018

International Journal of Engine Research

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This article describes the main results of an investigation about counter-bore injector nozzle impact on the combustion process in a modern Euro 6 diesel engine. First, hydraulic and spray visualization tests have been performed, showing a potential advantage of such nozzle design in fuel–air mixing efficiency. Then, combustion performance has been assessed on a GM-designed 1.6-L four-cylinder engine. The engine has been installed on a dynamometric test bench and instrumented with an AVL cylinder pressure transducer for heat release rate analysis, as well as HORIBA MEXA gas analyzer for exhaust emissions and AVL 415 Smoke Meter. Engine efficiency and emissions have been analyzed on four different part-load steady-state points, representative of New European Driving Cycle and Worldwide harmonized Light duty Test Cycle certification cycles, and covering engine speeds from 1250 to 2000 r/min and brake mean effective pressure between 0.2 and 1.4 MPa. Results of indicated analysis show that counter-bore nozzles have significant differences in terms of pilot injection combustion at low load points, which in turn lead to a better ignition and shorter combustion of the main injection. In addition, an improvement of diffusive combustion is observed as load increases. Because of both, fuel consumption is reduced by approximately 1% with respect to a standard nozzle. Finally, an appreciable decrease in engine exhaust emissions has been recorded, especially in terms of particulate matter and hydrocarbon emissions. This reduction has been linked to the improvement of fuel–air mixing promoted by the counter-bore nozzle previously observed.

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“…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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Investigation of internal nozzle flow, spray and combustion characteristics fueled with diesel, gasoline and wide distillation fuel (WDF) based on a piezoelectric injector and a direct injection compression ignition engine

Cited by 43 publications

References 35 publications

Effect of the In-Cylinder Back Pressure on the Injection Process and Fuel Flow Characteristics in a Common-Rail Diesel Injector Using GTL Fuel

Effect of the In-Cylinder Back Pressure on the Injection Process and Fuel Flow Characteristics in a Common-Rail Diesel Injector Using GTL Fuel

Impact of counter-bore nozzle on the combustion process and exhaust emissions for light-duty diesel engine application

Comparison of Different Techniques for Characterizing the Diesel Injector Internal Dimensions

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