Dynamics of isolated vortex cavitation

Pennings, P.C.; Bosschers, Johan; Westerweel, J.; Terwisga, Tom van

doi:10.1017/jfm.2015.379

Cited by 63 publications

(60 citation statements)

References 11 publications

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“…2, in the wave number and frequency domain resulted in clear dispersion relations of waves traveling on the interface of the vortex Pennings et al (2015). Conditions: z/c 0 = 1.14, Re = 9.2 × 10 5 and DO = 2.5 mg/l.…”

Section: Tip Vortex Cavity Resonance Frequencymentioning

confidence: 99%

“…In the results section, this method is compared to the shadowgraphy high-speed video of Pennings et al (2015). An example image of two views is given in Fig.…”

Section: Page 4 Of 13mentioning

confidence: 99%

“…The tip vortex cavity dynamics are not directly related to the propeller rotation rate. The excitation of this cavity often leads to high amplitude broadband pressure fluctuations between the fourth and seventh blade rate frequency (Wijngaarden et al 2005).To better understand the sound production from vortex cavitation, a model for the waves on a tip vortex cavity was developed and was shown to be able to describe the interface dynamics in detail (Pennings et al 2015). As a result, a condition could be predicted where a cavity resonance frequency could be amplified to produce high amplitude sound, as reported by Maines and Arndt (1997).…”

mentioning

confidence: 99%

“…To better understand the sound production from vortex cavitation, a model for the waves on a tip vortex cavity was developed and was shown to be able to describe the interface dynamics in detail (Pennings et al 2015). As a result, a condition could be predicted where a cavity resonance frequency could be amplified to produce high amplitude sound, as reported by Maines and Arndt (1997).…”

mentioning

confidence: 99%

“…It has been shown that a Lamb-Oseen vortex model poorly estimates the cavity size as a function of cavitation number (Pennings et al 2015). It is possible that overestimation of the vortex peak azimuthal velocity could have led to an overestimation of the cavity size.…”

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Flow field measurement around vortex cavitation

2015

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stage. These involve the smooth transport of vapor into the tip vortex, leading harmful implosions away from the propeller surface. The tip vortex cavity dynamics are not directly related to the propeller rotation rate. The excitation of this cavity often leads to high amplitude broadband pressure fluctuations between the fourth and seventh blade rate frequency (Wijngaarden et al. 2005).To better understand the sound production from vortex cavitation, a model for the waves on a tip vortex cavity was developed and was shown to be able to describe the interface dynamics in detail (Pennings et al. 2015). As a result, a condition could be predicted where a cavity resonance frequency could be amplified to produce high amplitude sound, as reported by Maines and Arndt (1997).The part that remains to be validated is a vortex model for the cavity size and cavity angular velocity. It has been shown that a Lamb-Oseen vortex model poorly estimates the cavity size as a function of cavitation number (Pennings et al. 2015). It is possible that overestimation of the vortex peak azimuthal velocity could have led to an overestimation of the cavity size. The main goal of the present study was to configure a simple low-order vortex model, to serve as an input into a vortex cavity wave dynamics model, to describe the tip vortex resonance frequency. It is based on the following steps.1. Model the tip vortex velocity field without cavitation (further referred to as wetted vortex) 2. Model the cavity size as a function of cavitation number based on wetted vortex properties 3. Show the difference in velocity field around a wetted and cavitating vortex 4. Obtain the cavity angular velocity value that gives the best correlation to the tip vortex cavity resonance frequency Abstract Models for the center frequency of cavitatingvortex induced pressure-fluctuations, in a flow around propellers, require knowledge of the vortex strength and vapor cavity size. For this purpose, stereoscopic particle image velocimetry (PIV) measurements were taken downstream of a fixed half-wing model. A high spatial resolution is required and was obtained via correlation averaging. This reduces the interrogation area size by a factor of 2-8, with respect to conventional PIV measurements. Vortex wandering was accounted for by selecting PIV images for a given vortex position, yielding sufficient data to obtain statistically converged and accurate results, both with and without a vapor-filled vortex core. Based on these results, the loworder Proctor model was applied to describe the tip vortex velocity outside the viscous core, and the cavity size as a function of cavitation number. The flow field around the vortex cavity shows, in comparison with a flow field without cavitation, a region of retarded flow. This layer around the cavity interface is similar to the viscous core of a vortex without cavitation.

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Section: Tip Vortex Cavity Resonance Frequencymentioning

confidence: 99%

“…In the results section, this method is compared to the shadowgraphy high-speed video of Pennings et al (2015). An example image of two views is given in Fig.…”

Section: Page 4 Of 13mentioning

confidence: 99%

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confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Flow field measurement around vortex cavitation

2015

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Complex phenomena study in dielectric fluid from gap during the W-EDM processing in ultrasonic field

Nani¹

2017

Int J Adv Manuf Technol

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Experimental investigation of flow field and string cavitation inside a transparent real-size GDI nozzle

et al. 2020

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Gasoline direct injection engines are highly dependent on the spray performance and associated combustion quality. The spray formation depends on many factors, namely internal flow characteristics, injection conditions, ambient conditions and fuel properties. There have been many studies performed to obtain a better understanding of these factors in recent years. In contrast to the others, studies on the internal flow characteristics are often performed numerically, as such, relevant experimental data is still lacking. Experimental investigations of the internal flow, such as flow turbulence, velocity distribution and cavitation are especially challenging under realistic conditions. Therefore, these conditions are generally simplified to diminish the demand for specialized experimental equipment and facilitate the measurements. In this regard, experimental data under relevant conditions are of high interest in the spray community. This work is focused on the internal flow study of multi-hole transparent nozzles under transient conditions at 1:1 geometrical scale. Injection pressure up to 100 bar is applied. The formation and development of string cavitation inside the nozzle hole are observed and presented in detail. For that, a novel ultra high-speed imaging technique at 5 MHz is applied. This technique in combination with the micro particle image velocimetry method, is then able to help to produce the velocity distribution of the internal flow. The velocity data is used further to reconstruct the pressure inside the nozzle by applying the Reynolds-averaged Navier-Stokes equations. Thus, the unique experimental data for the pressure distribution of the liquid fuel is obtained.

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Dynamics of isolated vortex cavitation

Cited by 63 publications

References 11 publications

Flow field measurement around vortex cavitation

Flow field measurement around vortex cavitation

Complex phenomena study in dielectric fluid from gap during the W-EDM processing in ultrasonic field

Experimental investigation of flow field and string cavitation inside a transparent real-size GDI nozzle

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