Fuel atomization for spray modelling

Elkotb, M.M.

doi:10.1016/0360-1285(82)90009-0

Cited by 194 publications

(59 citation statements)

References 17 publications

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“…Several research works have already paid attention to the spray properties of bio-fuels and their key roles on the mixture formation, combustion, and environmental issues [22][23][24][25][26][27][28][29]. In the present work, spray pattern and mixture formation of bio-ethanol and its blends with conventional gasoline have been examined, and in uences of a number of parameters on spray characteristics of several blends have been performed.…”

Section: Fuel Properties and Injection Systemmentioning

confidence: 98%

Experimental and theoretical investigation on spray characteristics of bio-ethanol blends using a direct injection system

Ghahremani¹,

Jafari²,

Ahari³

et al. 2017

Scientia Iranica

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Abstract. In the present work, the spray characteristics of bio-ethanol and its blends have been experimentally and theoretically investigated. To have a comprehensive study, the e ects of ambient condition and injection pressure on the spray of di erent blends have been considered. Macroscopic and microscopic characteristics of spray such as tip penetration length, cone angle, projected area, volume, Sauter Mean Diameter (SMD), and Ohnesorge number are investigated precisely. Besides, air entrainment and atomization analyses have been carried out to improve mixture formation process. Using curve tting and least squares method, theoretical correlations have been suggested in such a way to predict experimental results with the accuracy of 9.9%. To have a good estimation of the calculated parameters, uncertainty analysis has been performed. The results demonstrate that enhancing the injection pressure or decreasing the ambient pressure improves the atomization characteristics of spray. Moreover, outcomes of this study indicate that spray tip penetration is enhanced by increasing the injection pressure or bio-ethanol percentage in the blend, while spray cone angle showing the opposite behavior.

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Section: Fuel Properties and Injection Systemmentioning

confidence: 98%

Experimental and theoretical investigation on spray characteristics of bio-ethanol blends using a direct injection system

Ghahremani¹,

Jafari²,

Ahari³

et al. 2017

Scientia Iranica

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“…For example, when scaling the characteristic droplet diameter of sprays from pressure atomisers on the surface tension, power law exponents ranging from −0.15 to 0.737 [9][10][11][12][13] have been quoted. While there are differences in the considered injector geometries and the flow conditions among the various investigation, from the breadth of the reported correlations, it is clear that no consensus exists.…”

Section: Introductionmentioning

confidence: 99%

How do liquid fuel physical properties affect liquid jet development in atomisers?

Charalampous

Hardalupas

2016

Physics of Fluids

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The influence of liquid fuel properties on atomisation remains an open question. The droplet sizes in sprays from atomisers operated with different fuels may be modified despite the small changes of the liquid properties. This paper examines experimentally the development of a liquid jet injected from a plain orifice in order to evaluate changes in its behaviour due to modifications of the liquid properties, which may influence the final atomisation characteristics. Two aviation kerosenes with similar, but not identical physical properties are considered, namely standard JP8 kerosene as the reference fuel and bio-derived Hydro-processed Renewable Jet (HRJ) fuel as an alternative biofuel. The corresponding density, dynamic viscosity, kinematic viscosity and surface tension change by about +5%, -5%, -10% and +5% respectively, which are typical for ‘drop-in’ fuel substitution. Three aspects of the liquid jet behaviour are experimentally considered. The pressure losses of the liquid jet through the nozzle are examined in terms of the discharge coefficient for different flowrates. The morphology of the liquid jet is visualised using high magnification Laser Induced Fluorescence (LIF) imaging. Finally, the temporal development of the liquid jet interfacial velocity as a function of distance from the nozzle exit is measured from time-dependent motion analysis of dual-frame LIF imaging measurements of the jet. The results show that for the small changes in the physical properties between the considered liquid fuels, the direct substitution of fuel did not result in a drastic change of the external morphology of the fuel jets. However, the small changes in the physical properties modify the interfacial velocities of the liquid and consequently the internal jet velocity profile. These changes can modify the interaction of the liquid jet with the surroundings, including air flows in coaxial or cross flow atomisation, and influence the atomisation characteristics during changes of liquid fuels

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“… Diâmetro médio de Sauter (SMD) Existem muitas correlações para determinação do SMD, porém neste trabalho será utilizada a Equação de Elkobt [9], apresentada na Equação 1, por ser a mais recomendada pelos profissionais do setor automotivo [10]. Esta equação possui a facilidade de não ter sua aplicação restrita, podendo ser utilizada em qualquer condição operacional.…”

Section: Equações Utilizadas Nos Cálculos Dos Parâmetros Da Atomizaçãounclassified

Estudo da adição de biodiesel no diesel s10 e s500 e seus efeitos nas propriedades do combustível e na atomização

Carvalho¹,

Teixeira²,

Valle³

2016

Anais Do XXIV Simpósio Internacional De Engenharia Automotiva

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A preocupação ambiental despertada no último século promoveu a necessidade da evolução dos motores diesel de modo a minimizar a emissão de gases de efeito estufa e particulado pelos veículos que utilizam este combustível. A chegada no mercado dos novos motores Euro V, impulsionou a demanda por diesel com baixo teor de enxofre, contendo no máximo 10% deste elemento.As alterações nas propriedades do diesel ainda estão sendo estudadas de maneira a correlacionar o efeito que a adição do biodiesel poderia causar ao combustível, quando comparado ao diesel com maior teor de enxofre, o diesel S500. Também se faz necessário estudaro efeito da adição de biodiesel ao diesel, uma vez que o apelo ambiental deste biocombustível cresce a cada dia, indicando uma tendência ao aumento de sua utilização misturado ao diesel.Neste trabalho foram comparadas as propriedades físico-químicasde blendas de biodiesel misto soja/sebo, contendo antioxidante, com diesel S10 e S500 nas proporções volumétricas de 5%, 7%, 15% e 20%. Os parâmetros de atomização foram determinados para cada blenda com a finalidade de analisar o efeito do teor de enxofre e do teor de biodiesel na qualidade da atomização do combustível.Os métodos empregados para avaliação das amostras foram: estabilidade oxidativa,viscosidade a 40°C, acidez, massa específica, teor de água e tensão interfacial. Embora os parâmetros de atomização não tenham apresentado aumento significativo para as blendas contendo até 20% v/v de biodiesel, os resultados obtidos indicam uma tendência de aumento, ressaltando a importãncia e a necessidade de testes comprobatórios em motores.Palavras-chave: biodiesel, diesel, estabilidade oxidativa, atomização. INTRODUÇÃOA busca por novas fontes de energia e o conceito de sustentabilidade cada vez mais presente e necessário nos dias de hoje, torna a utilização de biocombustíveis não apenas essencial como também, estratégica. A histórica dependência de combustíveis fósseis se tornou crítica em

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Fuel atomization for spray modelling

Cited by 194 publications

References 17 publications

Experimental and theoretical investigation on spray characteristics of bio-ethanol blends using a direct injection system

Experimental and theoretical investigation on spray characteristics of bio-ethanol blends using a direct injection system

How do liquid fuel physical properties affect liquid jet development in atomisers?

Estudo da adição de biodiesel no diesel s10 e s500 e seus efeitos nas propriedades do combustível e na atomização

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