Influence of cavitation phenomenon on primary break-up and spray behavior at stationary conditions

Desantes, J.M.; Payri, Raúl; Salvador, Francisco; Morena, Joaquín De la

doi:10.1016/j.fuel.2010.06.004

Cited by 123 publications

(74 citation statements)

References 28 publications

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“…In fact, as a shown in Tab.5.5, spreading angle and ambient density are mutually related. It is also interesting to observe, that similar values for b were obtained in other studies including in the regression the experimental mesured spreading angle (b = −0.34 by Desantes et al [58] and b = −0.33 by Payri et al [23] Finally, it is worth to underline, that the considerations about the measured spreading angle should not be considered with a general extent. In particular, even after a fine tuning of the image processing technique, the field of view employed in the experiments and the test conditions studied are considered to have a significant impact on the reliability of the angle measured since, depending on these factors, the difference in the spreading angle may be found.…”

Section: Discussion and Analysissupporting

confidence: 77%

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Partial Needle Lift and Injection Rate Shape Effect on the Formation and Combustion of the Diesel Spray

Bardi¹

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Section: Discussion and Analysissupporting

confidence: 77%

“…Many works found in the literature demonstrated that this distance is so short that the whole spray can be analyzed from the point of view of the gas jet theory [58][59][60][61]. In this perspective the breakup process can be neglected and the droplets formed are so small that the heat transfer problem is reduced to a mixing issue.…”

Section: A-bmentioning

confidence: 99%

Partial Needle Lift and Injection Rate Shape Effect on the Formation and Combustion of the Diesel Spray

Bardi¹

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“…On the other hand, it is known from previous experimental studies that the cavitation produces a noticeable increase of the spray spreading angle ( [28][32] [37][38] [39]). …”

Section: Mixing Process Predictionmentioning

confidence: 99%

A computational investigation on the influence of the use of elliptical orifices on the inner nozzle flow and cavitation development in diesel injector nozzles

Molina

Salvador

Carreres

et al. 2014

Energy Conversion and Management

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Elsevier Molina, S.; Salvador Rubio, FJ.; Carreres Talens, M.; Jaramillo, D. (2014). A computational investigation on the influence of the use of elliptical orifices on the inner nozzle flow and cavitation development in diesel injector nozzles. Energy Conversion and Management. 79:114-127. doi:10.1016/j.enconman.2013.12.015. THE INFLUENCE OF THE USE OF ELLIPTICAL ORIFICES ON THE INNER NOZZLE FLOW AND CAVITATION DEVELOPMENT IN DIESEL INJECTOR A COMPUTATIONAL INVESTIGATION ON

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“…However, this measurement is not available in this experiment. Thus, by considering P l = Pinj, it leads to an identical cavitation number for both geometries: σ(Sharp ) = σ(Round ) = 1.003, indicating that cavitation is likely to occur [10,23] The injector is equipped with a needle lift sensor (micro-epsilon LS04(04)). The needle lift signal (blue curves in figure 2) presents three parts as usual, i.e.…”

Section: Injector and Transparent Nozzlementioning

confidence: 99%

Effect of geometry of real-size transparent nozzles on cavitation and on the atomizing jet in the near field

Cao

Idlahcen

Blaisot

et al. 2017

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

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Cavitation inception is very sensitive to the nozzle geometry. Two diesel-like transparent nozzles with sharp and round inlet edge were investigated under moderate injection pressure. By means of backlight imaging technique, images were recorded in two regions near the orifice: within ten orifice diameter downstream the nozzle and inside the nozzle, for different times after start of the injection. A cross-correlation technique was applied to images downstream the orifice to estimate the average velocity of the spray. The development of the spray was studied at the transient and full-opened stage, related to the needle lift motion. To analyse the flow inside the nozzle, the relative size of the vapour pockets was measured on the image and the relative frequency of the occurrence of cavitation was determined over image series. This approach permits to examine the time variation of the cavitation occurrence from the inlet to the outlet of the orifice. The results highlight the sensitivity of the cavitating flow to the shape of the inlet edge. Moreover, the trends of the variation over time of the velocity and of the cavitation frequency are very similar to each other but different for each geometry, indicating that the characteristics of the diesel spray in the near field is closely affected by the way cavitation is developing in the nozzle. Keywords diesel injection, index matching, backlight, liquid interface tracking, frequency of cavitation IntroductionFuel consumption and engine emission are important issues concerning transportation industries. Engine optimization still needs to be improved, not only to balance the global reduction of fossil fuel reserves, but also to reduce their environmental impact. There is a pressing need to address clean combustion objectives, by developing a better understanding and control of every process steps of internal combustion engines. Atomization of fuel is a key element as it impacts the whole combustion process by affecting the initial conditions of this process. In modern diesel engines, atomization efficiency was improved by considering high injection pressure in combination with small orifice diameter of only about a hundred micrometres or less. Large pressure variations of the fuel flow occurring inside injector nozzles promote cavitation occurrence. Indeed, cavitation occurs when the relative pressure drops locally below the vapour pressure of the fuel or when local stress is very high, resulting in the formation of vapour pockets or cavities in the nozzle orifice [1]. Nurick [2] proposed the first theoretical model to predict nozzle flow under cavitation, based on two-dimensional transparent single-orifice nozzles. Since then, similar nozzle designs were used to analyze the development of the cavitating flow and improve the model, by means of experiments [3,4,5,6,7] and simulations [8,9]. The flows in the nozzle were compared by changing either the L/D ratio or the inlet geometry of the orifice. Cavitation inception was found to be very sensitive to the nozzl...

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Influence of cavitation phenomenon on primary break-up and spray behavior at stationary conditions

Cited by 123 publications

References 28 publications

Partial Needle Lift and Injection Rate Shape Effect on the Formation and Combustion of the Diesel Spray

Partial Needle Lift and Injection Rate Shape Effect on the Formation and Combustion of the Diesel Spray

A computational investigation on the influence of the use of elliptical orifices on the inner nozzle flow and cavitation development in diesel injector nozzles

Effect of geometry of real-size transparent nozzles on cavitation and on the atomizing jet in the near field

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