The effect of nozzle geometry over the evaporative spray formation for three different fuels

Payri, Raúl; Viera, Juan P.; Gopalakrishnan, Vishrawas; Szymkowicz, Patrick G.

doi:10.1016/j.fuel.2016.10.064

Cited by 64 publications

(38 citation statements)

References 60 publications

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“…The right side of Figure 5, depicts the effect of chamber density on the spray tip penetration. As observed in the previous case, both Schlieren arrangements capture the effect of density in the spray development in agreement with the literature [10,17]. However, even though the double-pass setup still depicts higher penetration values, the difference between the optical arrangements is reduced when decreasing the density, and reports almost identical values at the lowest level in the conditions tested.…”

Section: Spray Tip Penetrationsupporting

confidence: 90%

“…The same line style format is maintained throughout the section. From that figure, both Schlieren setups captured the effect of injection pressure in the tip penetration [2,17,18] equally, as it increases in about the same ratio with increasing rail pressure. More interestingly, the DP configuration depicts higher spray penetration values, being more notably in the later part of the injection event.…”

Section: Spray Tip Penetrationmentioning

confidence: 87%

“…The core of the segmentation algorithm is based in a fixed threshold intensity-sensitive method [3,5,10,15]. But to improve the contour detection capabilities, an image-temporal-derivative approach [9,16,17] was added. Each produces gray-scale images, which are then combined with an adjustable weighted average.…”

Section: Image Processing Methodologymentioning

confidence: 99%

“…This way, the two approaches complement each other. A detailed description of the combined methodology is found in the work of Payri et al [17] Definition of the macroscopic spray variables With the contour of the spray defined, the next step is to calculate the macroscopic variable for comparison. Regularly, the spray tip penetration is defined as the furthest pixel from the orifice exit, measured in polar coordinates.…”

Section: Image Processing Methodologymentioning

confidence: 99%

“…This process is repeated for each time-step up to the end of injection. The SOI is calculated by extrapolating the penetration curve to zero, that is t(S = 0), with a quadratic fit [10,[17][18][19]. Since the high-temperature mirror in the double-pass setup makes it not possible to observe the first few millimeters of penetration, the SOI was calculated only with the SP data, and then copied to the double-pass data.…”

Section: Data Averaging and Start Of Injectionmentioning

confidence: 99%

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Vapor phase penetration measurements with both single and double-pass Schlieren for the same injection event

Payri

Salvador

Viera

2017

Proceedings ILASS–Europe 2017. 28th Conference on Liquid Atomization and Spray Systems

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Schlieren imaging has been adopted as a standard optical technique for the analysis of diesel sprays under engine like conditions. A single-pass Schlieren arrangement is typically used for the study of single-orifice nozzles, as vessels with multiple optical accesses regularly allow line of sight visualization. Contrarily, for multi-spray nozzles, measurements are commonly performed through a single optical access, in which case a double-pass arrangement is employed. As a consequence, the light beams pass through the test section twice, increasing the optical sensitivity of the Schlieren setup. However, the impact this has on the macroscopic spray characteristics is still unclear. The scope of this study is to analyze the differences in vapor phase penetration for the same injection event, through high-speed imaging, for both single and double-pass Schlieren configurations. Experiments were carried out with a three hole nozzle with a nominal orifice diameter of 90 µm, named Spray B from the Engine Combustion Network, using commercially available diesel fuel and in non-reactive conditions. The impact of different injection pressures and chamber densities on the spray captured by each setup was assessed. On the results, vapor phase penetration followed the expected trend found in the literature, as it increases with increasing injection pressure and decreasing chamber density. Comparing the optical setups, vapor phase penetration obtained with the double-pass arrangement was marginally higher. The deviation was observed throughout all tested conditions. Although the discrepancy was approximately constant for different injection pressures and chamber temperature, it increased with increasing density. These results highlight the importance of a proper understanding regarding the limitations of optical diagnostics, in particular for results used in calibration of computational models.

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Section: Spray Tip Penetrationsupporting

confidence: 90%

Section: Spray Tip Penetrationmentioning

confidence: 87%

Section: Image Processing Methodologymentioning

confidence: 99%

Section: Image Processing Methodologymentioning

confidence: 99%

Section: Data Averaging and Start Of Injectionmentioning

confidence: 99%

See 3 more Smart Citations

Vapor phase penetration measurements with both single and double-pass Schlieren for the same injection event

Payri

Salvador

Viera

2017

Proceedings ILASS–Europe 2017. 28th Conference on Liquid Atomization and Spray Systems

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Research of Nature of Interaction of Fuel Spray with Wall of Combustion Chamber of Overload Diesel Engine on Unique ‘Injection’ Research Installation

Lysov

Nikiforov

Ryzhuk

2018

Proceedings of the 4th International Conference on Industrial Engineering

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This paper provides the results of experimental research of visual development of diesel fuel spray and its interaction with the wall of combustion chamber for the regimes of an overloaded transport diesel engine. Studies are performed in a constant volume chamber using a unique 'Injection' research installation with colour high-speed video recording of the injection process. The analysis results show that the initial profile of the piston combustion chamber does not provide free development of the reverse-flow zone of the fuel spray after its collision with the combustion chamber wall, so the initial profile needs to be changed. To prove the efficiency of such measures, motor tests were performed for a one-cylinder diesel engine with the cylinder's diameter of 150 mm, piston stroke of 160 mm, and also equipped with an air compressor at crankshaft speed of 2000 min −1 . Two variants of piston structures, with an initial combustion chamber and a test one, were studied. The results of experimental research for a one-cylinder diesel engine show that the piston with the test combustion chamber in the whole studied range provides the improvement of fuel efficiency by 3-5 g/kW * h as compared to the initial combustion chamber without increasing of thermal and mechanical intensity which confirms the results of non-motor research.

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Effect of Nozzle Geometry and Fuel Modification on Atomization and Emission Characteristics in CI Engine: A Review

Yadav¹,

Chaturwedi²,

Sahu³

et al. 2023

Lecture Notes in Mechanical Engineering

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The effect of nozzle geometry over the evaporative spray formation for three different fuels

Cited by 64 publications

References 60 publications

Vapor phase penetration measurements with both single and double-pass Schlieren for the same injection event

Vapor phase penetration measurements with both single and double-pass Schlieren for the same injection event

Research of Nature of Interaction of Fuel Spray with Wall of Combustion Chamber of Overload Diesel Engine on Unique ‘Injection’ Research Installation

Effect of Nozzle Geometry and Fuel Modification on Atomization and Emission Characteristics in CI Engine: A Review

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