Noise Generation in Cavitating Flows, the Submerged Jet

Franklin, R. E.; McMillan, J.

doi:10.1115/1.3243124

Cited by 15 publications

(4 citation statements)

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“…A few complementary studies give the noise spectra created by cavitating valves (Hassis, 1999;Martin et al, 1981). In fact, it appears that far more research has been developed on submerged water jets (Jorgensen, 1961;Esipov and Naugol'nykh, 1975;Franklin and McMillan, 1984;Brennen, 1995;Latorre, 1997). A comprehensive overview of the state of the art in this domain is given in Brennen (1995).…”

Section: Article In Pressmentioning

confidence: 97%

Noise generated by cavitating single-hole and multi-hole orifices in a water pipe

Testud¹,

Moussou²,

Hirschberg³

et al. 2007

Journal of Fluids and Structures

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Section: Article In Pressmentioning

confidence: 97%

Noise generated by cavitating single-hole and multi-hole orifices in a water pipe

Testud¹,

Moussou²,

Hirschberg³

et al. 2007

Journal of Fluids and Structures

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“…The former observe that p s ∝ U m where m = 1.5 to 2. Different scaling laws will apply when the cavitation is generated by turbulent fluctuations such as in a turbulent jet (see, for example, Ooi 1985 andFranklin andMcMillan 1984). Then the typical tension experienced by a nucleus as it moves along a disturbed path in a turbulent flow is very much more difficult to estimate.…”

Section: Cavitation Noisementioning

confidence: 99%

Fundamentals of Multiphase Flow

Brennen

2005

836

550

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“…Considering the reduction of the initial bubble density 0 N′′′ , bubble number density N′′′ is calculated according to an empirical formula [9] :…”

Section: Cavitation Modelmentioning

confidence: 99%

Influence of diesel nozzle geometry on cavitation using eulerian multi-fluid method

Zhang

Yang

2010

Trans. Tianjin Univ.

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Abstract：Dependent on automatically generated unstructured grids, a comprehensive computational fluid dynamics (CFD)numerical simulation is performed to analyze the influence of nozzle geometry on the internal flow characteristics of a multi-hole diesel injector with the multi-phase flow model based on Eulerian multi-fluid method. The diesel components in nozzle are considered as two continuous phases, diesel liquid and diesel vapor respectively. Considering that both of them are fully coupled and interpenetrated, separate sets of governing equations are established and solved for each phase. The geometric parameters mainly include the length and exit diameter of nozzle, the rounded radius at inlet of nozzle orifice and the angle between axis of injector and axis of nozzle orifice, and they are individually taken into account to analyze the impact on the cavitating flow in nozzle. The results show that the geometrical characteristics of nozzle have a strong influence on the volume fraction of diesel vapor in nozzle and the outlet flow velocity of injector. So cavitation in nozzle orifice should not be neglected for the in-cylinder fuel atomization process, especially for the primary break-up of liquid jet.Fuel injection plays an important role in the performance and emissions of internal combustion engine, especially for modern diesel engine and gasoline direct injection (GDI) engine. Direct injection engines exhibit high potential for the reduction of fuel consumption, and thus more and more automobile manufacturers start to use high-pressure fuel injectors. The purpose of high inlet pressure is to produce high injection velocity which results in an efficient atomization process with small and dispersed fuel droplets to enable rapid evaporation and traverse rapidly through the combustion chamber [1] . There is experimental evidence to show that cavitation within injector nozzle modifies the flow characteristics of nozzle exit and favors the atomization of fuel [2][3][4][5] .Cavitation in nozzle orifice is desired to a certain degree because the collapse of cavitation bubbles influences the turbulence intensity towards the outlet of injector. Consequently, this enhances the atomization process of fuel in the combustion chamber. At the same time, the accurate prediction of cavitation zones in nozzle is quite necessary in order to avoid efficiently the erosion of the inner surface in nozzle orifice due to collapse of bubbles close to nozzle walls. However, it is usually very difficult to observe the flow state in nozzle for a real injector under operating conditions, therefore, the multidimensional numerical calculation, computational fluid dynamics (CFD) simulation, is an appropriate tool to provide a better understanding of 3D flow features inside and at the exit of injector nozzle.The Eulerian multi-fluid method introduced in this paper can be used to simulate n-phase flows and different types of injector, such as Sac-type nozzle and VCO-type nozzle. In the present work, the 3D numerical simulation of a VCO-type...

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Noise Generation in Cavitating Flows, the Submerged Jet

Cited by 15 publications

References 0 publications

Noise generated by cavitating single-hole and multi-hole orifices in a water pipe

Noise generated by cavitating single-hole and multi-hole orifices in a water pipe

Fundamentals of Multiphase Flow

Influence of diesel nozzle geometry on cavitation using eulerian multi-fluid method

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