Airblast atomization

Lefebvre, A. H.

doi:10.1016/0360-1285(80)90017-9

Cited by 236 publications

(123 citation statements)

References 25 publications

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“…In a prompt atomisation process, air velocity, ALR, and fuel properties such as surface tension and density play primary roles, while viscosity takes a reduced role [40]. In general, test fuels have smaller droplet size at a high air velocity injection.…”

Section: Sauter Mean Diameter Analysis Of Bioethanol Blends With Biodmentioning

confidence: 99%

Performance and emission characteristics of micro gas turbine engine fuelled with bioethanol-diesel-biodiesel blends

Saifuddin¹,

Refal²,

Palanisamy³

2017

Int. J. Automot. Mech. Eng.

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Biodiesel is receiving increasing attention as an alternative fuel due to the ever-growing demand for energy. However, the inferior physiochemical properties of biodiesel render it incompatible for gas turbine application, which needs to meet the standard requirement of gas turbine fuel accordance to ASTM D2880. In this quest, the biodiesel-dieselbioethanol blends might be a good option. In this paper, the research work was carried out to study experimentally the performance and exhaust emission characteristics of a 25kW micro gas turbine engine (Capstone Model C30) fuelled with biodiesel-dieselbioethanol blends. The assessment on the improved fuel properties of biodiesel by blending with bio-ethanol had shown more superior atomisation characteristics performance compared to unmodified biodiesel. Moreover, the performance test in the micro gas turbine was limited up to 20% blend of biofuel, which showed improved thermal efficiency during the test. Subsequently, the emission test carried out in this work also showed significant enhancement in emissions, except nitrogen oxides (NOx) which contributed to the higher formation in comparison with the distillate diesel. Finally, B80E20 (80:20 of biodiesel-bioethanol) was proposed to be selected as an ideal blended fuel ratio to be applied in micro gas turbine engine due to its adaptability to replace diesel fuel, while showed better performance and emission properties as compared to the pure petroleum diesel.

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Section: Sauter Mean Diameter Analysis Of Bioethanol Blends With Biodmentioning

confidence: 99%

Performance and emission characteristics of micro gas turbine engine fuelled with bioethanol-diesel-biodiesel blends

Saifuddin¹,

Refal²,

Palanisamy³

2017

Int. J. Automot. Mech. Eng.

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“…From observation, both fuels establish a bluish flame near the burner outlet (where the intense heat release occurs) and a luminous yellow flame downstream. The bluish premixed flame near the flame root is the typical characteristics of twin-fluid atomizer where the atomizing air enhances mixing with droplets [19]. The intense luminosity is attributed to the soot radiation as a result of high content of aromatic rings in diesel (~20-40%) and Jet-A1 fuel (~10-20%).…”

Section: Flame Imagingmentioning

confidence: 99%

Spray Combustion Characteristics of Palm Biodiesel

Chong

Hochgreb

2012

Combustion Science and Technology

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The potential of Palm Methyl Esters (PME) as an alternative fuel for gas turbines is investigated using a swirl burner. The main air flow is preheated to 623 K and a swirling spray flame is established at atmospheric pressure. The spray combustion characteristics of PME are compared to diesel and Jet-A1 fuel under the same burner power output of 6 kW. Investigation of the fuel atomizing characteristics using Phase Doppler Anemometry (PDA) shows that most droplets are distributed within the flame reaction zone region. PME droplets exhibit higher Sauter Mean Diameter (SMD) values than baseline fuels, and thus higher droplet penetration length and longer evaporation timescales. PME swirl flame presents a different visible flame reaction zone while combusting with low luminosity and produces no soot. NOx emissions per unit energy are also reduced by using PME relative to those of conventional fuels, in spite of the ~17% higher specific fuel consumption and slightly larger droplets.

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“…Many researchers have studied the spray characteristics of a prefilming type of airblast atomizer, and revealed that a liquid film thickness, liquid flowrate, and air velocity are important parameters. Lefebvre reviewed the investigations on airblast atomizers, and pointed out the advantages of airblast atomizers such as lower fuel pressure, low soot formation, constant fuel distribution over the whole range of fuel flow rate, and fine mixing between fuel and air [1]. Inamura et al experimentally investigated the spray characteristics of a prefilming type of airblast atomizer using the two-dimensional test atomizer with a rectangular cross-section [2].…”

Section: Introductionmentioning

confidence: 99%

Effect of Prefilmer Edge Thickness on Breakup Phenomena of Liquid Film in Prefilming Airblast Atomizer

Okabe¹,

Katagata²,

Sakaki³

et al. 2017

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

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This paper describes the investigation of the effect of a prefilmer edge thickness on the breakup phenomena of a liquid film in a prefilmer airblast atomizer. The breakup phenomena of the liquid film at five prefilmer edge thicknesses (160, 500, 1250, 2000, and 3000 μm) under various conditions was observed using a high-speed camera. The breakup length of the liquid film was calculated by an image processing technique developed in this study. In order to quantitatively evaluate the effect of the prefilmer edge thickness on the breakup frequency, the Fast Fourier Transformation (FFT) analysis was conducted based on the time evolution of the breakup length. The results indicated that the breakup length increase and the breakup frequency decreases by increasing prefilmer edge thickness due to a larger volume of a liquid accumulation attaching to the prefilmer edge. The FFT analysis showed that the increase in prefilmer edge thickness causes the transition of the maximal power spectrum to a lower frequency (i.e. less than 100 Hz) due to the increase in the liquid accumulation at the edge as well. Finally, a dimensionless correlation has been proposed for the breakup length of a liquid film. Keywords Prefilming airblast atomizer, Breakup length, Breakup frequency, Prefilmer edge thickness, FFT analysis IntroductionIn the recent jet engine, the prefilming airblast atomizer has been widely used for the liquid fuel injection due to a good spray characteristics even at low fuel injection pressure. This type of atomizer uses the high-speed air stream flowing in the combustor for the atomization of a liquid fuel. Thus, the pressure loss of atomizing air in an atomizer is smaller than a conventional atomizer using the air stream, and leads to stable performances of the combustor over the entire range of operating conditions. The atomization mechanism of a prefilming type of airblast atomizer is well known. After injection, the liquid homogeneously wet the prefilmer surface, and flows down to the prefilmer edge in the form of a liquid film that is sheared by the high-speed air stream. The liquid film accumulates at the prefilmer edge. This accumulation is sheared by air and disintegrated into the bag-shaped liquid framed by a thicker rim. The bag-shaped part of the structure bursts and generates fine droplets. The rim is stretched and fragments into two elongated ligaments that disintegrate into larger droplets. Many researchers have studied the spray characteristics of a prefilming type of airblast atomizer, and revealed that a liquid film thickness, liquid flowrate, and air velocity are important parameters. Lefebvre reviewed the investigations on airblast atomizers, and pointed out the advantages of airblast atomizers such as lower fuel pressure, low soot formation, constant fuel distribution over the whole range of fuel flow rate, and fine mixing between fuel and air [1]. Inamura et al. experimentally investigated the spray characteristics of a prefilming type of airblast atomizer using the two-dimensional test a...

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Airblast atomization

Cited by 236 publications

References 25 publications

Performance and emission characteristics of micro gas turbine engine fuelled with bioethanol-diesel-biodiesel blends

Performance and emission characteristics of micro gas turbine engine fuelled with bioethanol-diesel-biodiesel blends

Spray Combustion Characteristics of Palm Biodiesel

Effect of Prefilmer Edge Thickness on Breakup Phenomena of Liquid Film in Prefilming Airblast Atomizer

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