Study of formation and development of disturbance waves in annular gas–liquid flow

Алексеенко, С. В.; Cherdantsev, Andrey V.; Cherdantsev, Mikhail V.; Isaenkov, Sergey V.; Маркович, Д. М.

doi:10.1016/j.ijmultiphaseflow.2015.08.007

Cited by 62 publications

(25 citation statements)

References 32 publications

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“…One may suppose that the initial waves correspond to the waves of maximum growth rate appearing due to Kelvin-Helmholtz instability on film surface. In the configuration studied by Alekseenko et al [5], a second peak has been observed in the power spectra, due to the presence of "disturbance waves" (not observed in the present study) Fmax increases quasi linearly with UG (table 2). This result is in satisfactory agreement with the study of Alekseenko et al [5] carried out with a lower liquid Reynold number (Re  =400).…”

Section: Liquid Film Characteristicssupporting

confidence: 59%

“…In the configuration studied by Alekseenko et al [5], a second peak has been observed in the power spectra, due to the presence of "disturbance waves" (not observed in the present study) Fmax increases quasi linearly with UG (table 2). This result is in satisfactory agreement with the study of Alekseenko et al [5] carried out with a lower liquid Reynold number (Re  =400). Therefore the values of Fmax cannot be compared directly but the comparison between both studies shows clearly the increase in Fmax with Re  and ReD as Alekseenko et al [5] observed.…”

Section: Liquid Film Characteristicssupporting

confidence: 59%

“…To make experimental observations in the annular geometry is an enormous challenge. For that reason researchers often study liquid film [5] and the spray [6] [7] separately. In this context, we propose an experimental study on the liquid film and the spray for a basic annular prefilming airblast.…”

Section: Introductionmentioning

confidence: 99%

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Coupled study of film and spray on a basic annular prefiming airblast atomizer

Gosselin

Ferret

Bazile

2017

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

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One way to increase efficiency and reduce pollution in transport and energetic domain is designing fuel injectors with better atomization. In this work, experiments were performed on a prefilming airblast atomizer often used in gas turbine engines. For this purpose, a new injector was designed to visualize the prefilming zone and the primary atomization together. The flow configuration corresponds to an annular liquid film sheared by inner high velocity airflows. High speed Shadowgraphy was used to observe film and spray, liquid film frequency, wave velocity and wave deformation, primary breakup regime. Finally, a link between liquid film and the primary atomization are shown first qualitatively and after quantitatively. KeywordsAtomization, liquid film, annular geometry, airblast, prefilming IntroductionOne way to increase efficiency and reduce pollution in transport and energetic domains is designing fuel injectors with better atomization properties [1]. Prefilming airblast atomizers often used in gas turbine engines, offer advantages in terms of atomization quality over a wide range of fuel flow rates. Nevertheless, spray formation mechanisms due to the disintegration of a liquid film are still not completely known. This type of injector is often studied in a planar geometry separately. In this context, we propose an experimental study on the liquid film and the spray for a basic annular prefilming airblast. The paper starts by presenting the experimental set-up designed at IMFT (Institut de Mécanique des Fluides de Toulouse). The destabilization and the atomization of the liquid film have been studied with high speed shadowgraphy method. Then the liquid film is characterized with its different regimes, frequencies of waves, wave velocities and wave deformations. Furthermore observations are made on the regimes of sprays, the possible dependence between the liquid regime and breakup modes. And to finish the preservation between conditions of film near the injector exit and the initial conditions about the primary atomization.

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Section: Liquid Film Characteristicssupporting

confidence: 59%

Section: Liquid Film Characteristicssupporting

confidence: 59%

See 1 more Smart Citation

Coupled study of film and spray on a basic annular prefiming airblast atomizer

Gosselin

Ferret

Bazile

2017

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

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“…In recent paper [2] spatiotemporal evolution of waves in one longitudinal section of 15 mm pipe was studied near the inlet using laser-induced fluorescence technique. It was concluded that disturbance waves are formed due to multiple coalescence of initial high-frequency waves that appear due to Kelvin-Helmholtz instability.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional investigation of liquid film structure at the initial area of annular-dispersed flow

Алексеенко

Cherdantsev

et al. 2016

MATEC Web Conf.

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Abstract. Initial stage of downward flow of gas-sheared liquid film in a vertical rectangular duct was studied using brightness-based laser-induced fluorescence technique. Measurements were resolved along both longitudinal and transverse coordinates and time. The initial highfrequency waves which are formed at the inlet were found to be two-dimensional. These waves are promptly broken into localised horseshoe-shaped waves which merge downstream to form large-scale quasi-2D disturbance waves. Peculiarities of three-dimensional evolution of waves of different types were studied in a wide range of flow parameters.

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“…As far as high speed gaseous jets is concerned, it has been supposed an analogous behavior, i.e., the disturbance waves are the dominant but small ripple waves exists too. Many recent studies with high spatial resolution [Alekseenko, 2009[Alekseenko, & 2015Setyawan, 2014;Cherdantsev, 2014;Dasgupta, 2017] confirm that disturbance waves are much more complex than a simply wave and the importance of the ripple waves. The disturbance waves are covered by ripple waves than can travel at a slower or faster velocity than the mother disturbance wave [Cherdantsev, 2014;Alekseenko, 2009].…”

Section: The Gas-liquid Interfacementioning

confidence: 99%

Estimation of the radioactive aerosols capture in accidental sequences of nuclear power plants

Escriche¹

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Study of formation and development of disturbance waves in annular gas–liquid flow

Cited by 62 publications

References 32 publications

Coupled study of film and spray on a basic annular prefiming airblast atomizer

Coupled study of film and spray on a basic annular prefiming airblast atomizer

Three-dimensional investigation of liquid film structure at the initial area of annular-dispersed flow

Estimation of the radioactive aerosols capture in accidental sequences of nuclear power plants

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