The Tab Method for Numerical Calculation of Spray Droplet Breakup

O’Rourke, P.J.; Amsden, A.A.

doi:10.4271/872089

Cited by 835 publications

(305 citation statements)

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“…O OpenFOAM também oferece a possibilidade de contabilizar as alterações no arrasto devido a oscilações da superfície da gotícula, isto é, as ondas de instabilidade, eventualmente, resultando em separação de gotículas. Se este modelo é usado, o modelo separador [75] será utilizado para calcular as oscilações e o arraste resultante será adicionado ao arrasto, descrito por…”

Section: Figura 43: Esquema Do Modelo Kh-rt De Quebra De Gotas [4]unclassified

Modelo De PDF Presumida Com Cinética Química Tabulada Aplicada Para a Combustão Em Sprays

SOUZA¹

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A Deus, que me concedeu força, sabedoria e sustento para a realização desse trabalho.Ao meus orientadores Professor Sérgio Leal Braga e Professor Wladimyr Mattos da Costa Dourado pela confiança e parceria e ajuda em momentos difíceis durante a realização dessa tese.A PUC -Rio e a CAPES, pelo suporte financeiro e auxílios concedidos para o desenvolvimento.Ao INMETRO, Dra. Maria Helena Farias e Dr. Renan Teixeira pelo auxílio na utilização de computadores para a geração de resultados.Ao IAE por pelo suporte e a utilização de suas instalações. Aos meus amigos do INPE Bruno Trevisan, Guilherme Sempionato, Danilo Oliveira e Rafael Siqueira pela amizade, apoio e compressão. Neste trabalho, foi desenvolvida uma modificação do modelo para simulação de sprays Diesel com o método de PDF presumida e cinética química tabulada. Através do acoplamento entre a parte química e a parte turbulenta, avaliou-se os efeitos do spray com a metodologia flamelet. Onde o conceito flamelet trata a chama difusiva e transiente como um conjunto de chamas unidimensionais, utilizando o modelo de PDF presumida para a avaliação dos valores turbulentos. A validação do modelo foi realizada com dados experimentais do laboratório Sandia, em uma câmara a volume constante. A validação e a aplicação do modelo foram conduzidas em diferentes tipos de ensaios experimentais: avaliação e comparação para diferentes modelos de cinética química do n-heptano, validação do método para o modelo de turbulência k − ϵ na câmara de volume constante do Sandia para o n-heptano não reativo, validação e comparação do modelo para o spray reativo e aplicação de modelo para o estudo comprimento do ancoramento de chama e para o tempo de atraso de ignição do n-heptano para diferentes temperaturas ambientes. Em geral,a modelagem proposta tem demonstrado excelente capacidade de previsão para a combustão com spray Diesel numa vasta gama de aplicações e é um candidato altamente promissor para outras aplicações em motores Diesel. In this work, a modification of the model for the simulation of diesel sprays with the presumed PDF method and tabulated chemical kinetics was developed. Through the coupling between the chemical part and the turbulent part, the effects of the spray were evaluated for the flamelet methodology. Where the textit flamelet concept treats the diffusive and transient flame as a set of one-dimensional flames, using the presumed PDF model for the evaluation of turbulent values. The validation of the model was performed with experimental data from the Sandia laboratory, in a chamber at constant volume. The validation and application of the model were conducted in different types of experimental trials: evaluation and comparison for different chemical kinetics models of n-heptane, validation of the method for the turbulence model k−ϵ in the constant volume chamber of the Sandia for non-reactive n-heptane, validation and comparison of the model for the reactive spray and model application for the study of the flame anchoring length and for the ignition delay time of...

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Section: Figura 43: Esquema Do Modelo Kh-rt De Quebra De Gotas [4]unclassified

Modelo De PDF Presumida Com Cinética Química Tabulada Aplicada Para a Combustão Em Sprays

SOUZA¹

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“…In the same year (1987), O'Rourke and Amsden presented a model on droplet deformation and breakup called the TAB model [67]. This model was based on the analogy, first suggested by Taylor [88], between an spring-mass system and a droplet oscillating.…”

Section: Literature Review On Droplet Deformation and Breakupmentioning

confidence: 99%

“…Droplet breakup due to strong aerodynamics forces have been widely studied over the last half-century, starting with the works of Lane [56], Hinze [36], Wolfe and Andersen [102], or Ranger and Nicholls [77,78], passing through Krezeczkowski [54], Pilch and Erdman [73], O'Rourke and Amsden [67], Wierzba and Takayama [101], Wierzba [100] or Hsiang and Faeth [40,41] up to the more recent works of Han and Tryggvasson [30,31], Luxford et al [24,60,59], Chen [14], Theofanous et al [92,91], Guildenbecher [29] and Theofanous [90].…”

Section: Literature Review On Droplet Deformation and Breakupmentioning

confidence: 99%

“…In this study, a droplet breakup, splashing and rebound model was used to simulate the droplet impingement distribution in a clean MS(1)-0317, GLC-305 airfoil, and an 'iced' NACA23012 (with 22 min simulated ice shape) airfoil. They used a breakup model based on the Taylor Analogy Breakup (TAB) model [67], which assumes that droplet oscillatory motion is analogous to that of a damped spring-mass system under-going a forced oscillatory motion. Droplet breakup is then assumed to occur when the displacement of the equator of the droplet from its equilibrium position exceeds half the radius of the undistorted droplet according to O'Rouke and Amsden [67].…”

Section: Literature Review On Technological Application Aspectsmentioning

confidence: 99%

“…They used a breakup model based on the Taylor Analogy Breakup (TAB) model [67], which assumes that droplet oscillatory motion is analogous to that of a damped spring-mass system under-going a forced oscillatory motion. Droplet breakup is then assumed to occur when the displacement of the equator of the droplet from its equilibrium position exceeds half the radius of the undistorted droplet according to O'Rouke and Amsden [67]. They validated the model using experimental data of tests conducted in a horizontal tunnel by Wierzba [100] and in a vertical tunnel by Kennedy and Roberts [50].…”

Section: Literature Review On Technological Application Aspectsmentioning

confidence: 99%

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Water droplet deformation and breakup in the vicinity of the leading edge of an incoming airfoil

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This chapter reviews the fundamental processes involved in the introduction of fuels into the engine. Spray nozzles commonly used in engine applications are summarized, together with fuel introduction strategies ranging from classical carburetor intake manifold fuel introduction to modern port fuel injection (PFI) fuel injectors. Issues relevant for direct in‐cylinder fuel introduction spark‐ignition and diesel engines are also reviewed. The effects of air entrainment on spray penetration and vaporization, together with injector nozzle, injection timing and fuel effects on combustion, oil dilution, and engine wear are also discussed. In addition, the effect of fuel spray interaction with in‐cylinder airflows is discussed. Current models of fundamental spray processes in engines are reviewed, including models for atomization, drop breakup, drop collision and coalescence, vaporization, drag and deformation, turbulent diffusion, and spray/wall impingement processes. This chapter concludes with a discussion of new computational tools that are currently under development for improved understanding of spray processes.

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The Tab Method for Numerical Calculation of Spray Droplet Breakup

Cited by 835 publications

References 14 publications

Modelo De PDF Presumida Com Cinética Química Tabulada Aplicada Para a Combustão Em Sprays

Modelo De PDF Presumida Com Cinética Química Tabulada Aplicada Para a Combustão Em Sprays

Water droplet deformation and breakup in the vicinity of the leading edge of an incoming airfoil

Fuel Introduction

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